4.2.2 (#601 )

strict writes to STM, remove type class (#600 )
4.2.1
2026-08-30 18:28:23 +00:00 · 2023-01-12 16:01:50 +00:00 · 2023-01-12 14:59:46 +00:00 · 2023-01-11 22:24:38 +00:00 · 2023-01-11 16:14:33 +00:00 · 2023-01-09 11:16:25 +00:00
114 changed files with 13029 additions and 3782 deletions
@@ -11,35 +11,51 @@ on:

 jobs:
  build:
-    runs-on: ubuntu-20.04
+    name: build-${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-18.04
+          - os: ubuntu-20.04
    steps:
      - name: Clone project
        uses: actions/checkout@v2

-      - name: Setup Stack
+      - name: Setup Haskell
        uses: haskell/actions/setup@v1
        with:
          ghc-version: "8.10.7"
-          enable-stack: true
-          stack-version: "latest"
+          cabal-version: "latest"

      - name: Cache dependencies
        uses: actions/cache@v2
        with:
-          path: ~/.stack
-          key: ${{ hashFiles('stack.yaml') }}
+          path: |
+            ~/.cabal/store
+            dist-newstyle
+          key: ${{ matrix.os }}-${{ hashFiles('cabal.project', 'simplexmq.cabal') }}

-      - name: Build & test
-        id: build_test
+      - name: Build
+        shell: bash
+        run: cabal build --enable-tests
+
+      - name: Test
+        if: matrix.os == 'ubuntu-18.04'
+        timeout-minutes: 30
+        shell: bash
+        run: cabal test --test-show-details=direct
+
+      - name: Prepare binaries
+        if: startsWith(github.ref, 'refs/tags/v') && matrix.os == 'ubuntu-20.04'
        shell: bash
        run: |
-          stack build --test --force-dirty
-          install_root=$(stack path --local-install-root)
-          mv ${install_root}/bin/smp-server smp-server-ubuntu-20_04-x86-64
-          mv ${install_root}/bin/ntf-server ntf-server-ubuntu-20_04-x86-64
+          mv $(cabal list-bin smp-server) smp-server-ubuntu-20_04-x86-64
+          mv $(cabal list-bin ntf-server) ntf-server-ubuntu-20_04-x86-64

      - name: Build changelog
-        if: startsWith(github.ref, 'refs/tags/v')
+        if: startsWith(github.ref, 'refs/tags/v') && matrix.os == 'ubuntu-20.04'
        id: build_changelog
        uses: mikepenz/release-changelog-builder-action@v1
        with:
@@ -50,19 +66,8 @@ jobs:
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

-      - name: Extract release candidate
-        if: startsWith(github.ref, 'refs/tags/v')
-        id: extract_release_candidate
-        shell: bash
-        run: |
-          if [[ ${GITHUB_REF} == *rc* ]]; then
-            echo "::set-output name=release_candidate::true"
-          else
-            echo "::set-output name=release_candidate::false"
-          fi
-
      - name: Create release
-        if: startsWith(github.ref, 'refs/tags/v')
+        if: startsWith(github.ref, 'refs/tags/v') && matrix.os == 'ubuntu-20.04'
        uses: softprops/action-gh-release@v1
        with:
          body: |
@@ -70,7 +75,7 @@ jobs:

            Commits:
            ${{ steps.build_changelog.outputs.changelog }}
-          prerelease: ${{ steps.extract_release_candidate.outputs.release_candidate }}
+          prerelease: true
          files: |
            LICENSE
            smp-server-ubuntu-20_04-x86-64
@@ -4,3 +4,6 @@
 *.session.sql
 tests/tmp
 dist-newstyle/
+
+cabal.project.local
+cabal.project.local~
@@ -1,3 +1,143 @@
+# 4.2.0
+
+SMP agent and server:
+
+- reduce sender traffic in cases when queue quota is exceeded:
+  - server sends quota exceeded message to the recipient when sender receives ERR QUOTA.
+  - recipient sends QCONT message to the send once the queue is drained (via reply queue).
+  - sender retry delays are increased, reducing traffic, but sender instantly resumes delivery where QCONT is received.
+
+SMP server:
+
+- increase internal queue sizes.
+
+SMP agent:
+
+- deduplicate connection IDs in connect/disconnect responses.
+- unit tests for Crypto.hs.
+- fix connection switch to another queue: correctly set primary send queue.
+
+Notification server (v1.3.0):
+
+- check token status when sending verification notificaiton.
+
+# 4.1.0
+
+SMP agent and server:
+
+- option to toggle TLS handshake error logs (disabled by default).
+
+SMP agent:
+
+- include server address in BROKER error.
+- api to get hash of double ratchet associated data (for connection verification).
+- api to get agent statistics.
+
+# 4.0.0
+
+SMP server:
+
+- Basic authentication. The server address can now include an optional password that is required to create messaging queues, so the contacts who message you will not be able to receive messages via your server, unless you share with them the address with the password. It is recommended to enable basic authentication on all private servers by adding `create_password` parameter into AUTH section of server INI file (the previously deployed servers do not have this section, you need to add it).
+- Disable creating new queues completely with `new_queues: off` parameter in AUTH section of INI file - it can be used to simplify migrating the exising connections to another server.
+- Updated server CLI with changed defaults:
+  - interactive server initialization, use -y flag to initalize the server non-interactively.
+  - store log is now enabled by default, so messaging queues and messages are restored when the server is restarted (to restore undelivered messages the server needs to be stopped with SIGINT signal).
+  - a random password is now generated by default during the server initialization.
+
+SMP agent:
+
+- API to test SMP servers. It connects to the server, creates and deletes a messaging queue. The new SimpleX Chat client uses this API to allow you to test that you have the correct server address, with the valid certificate fingerprint and pasword, before enabling the new server.
+
+# 3.4.0
+
+SMP agent:
+
+- increase concurrency with connection-level locks
+- fix issues identified in security assessment (see the announcement: https://github.com/simplex-chat/simplex-chat/blob/stable/blog/20221108-simplex-chat-v4.2-security-audit-new-website.md)
+- manual connection queue rotation
+- optional client data in connection requests links
+
+SMP server:
+
+- specialize monad stack to improve performance
+- log slow commands
+
+# 3.3.0
+
+SMP server:
+
+- allow repeated KEY command with the same key (to avoid failures on retries)
+
+SMP agent:
+
+- enable/disable connection notifications
+- asynchronous commands that retry on network error
+- use SQLCipher
+
+# 3.2.0
+
+SMP agent:
+
+- Support multiple server hostnames (including onion hostnames) in server addresses.
+- Network configuration options.
+- Options to define rules to choose server hostname.
+
+# 3.1.0
+
+SMP server and agent:
+
+- SMP protocol v4: batching multiple server commands/responses in a transport block.
+
+# 3.0.0
+
+SMP server:
+
+- restore undeliverd messages when the server is restarted.
+- SMP protocol v3 to support push notification:
+  - updated SEND and MSG to add message flags (for notification flag that contros whether the notification is sent and for any future extensions) and to move message meta-data sent to the recipient into the encrypted envelope.
+  - update NKEY and NID to add e2e encryption keys (for the notification meta-data encryption between SMP server and the client), and update NMSG to include this meta-data.
+  - update ACK command to include message ID (to avoid acknowledging unprocessed message).
+  - add NDEL commands to remove notification subscription credentials from SMP queue.
+  - add GET command to receive messages without subscription - to be used in iOS notification service extension to receive messages without terminating app subscriptions.
+
+SMP agent:
+
+- new protocol for duplex connection handshake reducing traffic and connection time.
+- support for SMP notifications server and managing device token.
+- remove redundant FQDN validation from TLS handshake to prepare for access via Tor.
+- support for fully stopping agent and for termporary suspending agent operations.
+- improve management of duplicate message delivery.
+
+SMP notifications server v1.0:
+
+- SMP notifications protocol with version negotiation during handshake.
+- device token registration and verification (via background notification).
+- SMP notification subscriptions and push notifications via APNS.
+- restoring notification subscriptions when the server is restarted.
+
+# 2.3.0
+
+SMP server:
+
+- Save and restore undelivered messages, to avoid losing them. To save messages the server has to be stopped with SIGINT signal, if it is stopped with SIGTERM undelivered messages would not be saved.
+
+# 2.2.0
+
+SMP server:
+
+- Fix sockets/threads/memory leak
+
+SMP agent:
+
+- Support stopping and resuming agent with `disconnectAgentClient` / `resumeAgentClient`
+
+# 2.1.1
+
+SMP server:
+
+- gracefully close sockets on client disconnection
+- CLI warning when deleting server configuration
+
 # 2.1.0

 SMP server:
@@ -11,7 +11,7 @@ If you have a server deployed please deploy a new server to a new host and retir

 ## Message broker for unidirectional (simplex) queues

-SimpleXMQ is a message broker for managing message queues and sending messages over public network. It consists of SMP server, SMP client library and SMP agent that implement [SMP protocol](https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md) for client-server communication and [SMP agent protocol](https://github.com/simplex-chat/simplexmq/blob/master/protocol/agent-protocol.md) to manage duplex connections via simplex queues on multiple SMP servers.
+SimpleXMQ is a message broker for managing message queues and sending messages over public network. It consists of SMP server, SMP client library and SMP agent that implement [SMP protocol](./protocol/simplex-messaging.md) for client-server communication and [SMP agent protocol](./protocol/agent-protocol.md) to manage duplex connections via simplex queues on multiple SMP servers.

 SMP protocol is inspired by [Redis serialization protocol](https://redis.io/topics/protocol), but it is much simpler - it currently has only 10 client commands and 8 server responses.

@@ -27,7 +27,7 @@ SimpleXMQ is implemented in Haskell - it benefits from robust software transacti

 ### SMP server

-[SMP server](https://github.com/simplex-chat/simplexmq/blob/master/apps/smp-server/Main.hs) can be run on any Linux distribution, including low power/low memory devices. OpenSSL library is required for initialization.
+[SMP server](./apps/smp-server/Main.hs) can be run on any Linux distribution, including low power/low memory devices. OpenSSL library is required for initialization.

 To initialize the server use `smp-server init -n <fqdn>` (or `smp-server init --ip <ip>` for IP based address) command - it will generate keys and certificates for TLS transport. The fingerprint of offline certificate is used as part of the server address to protect client/server connection against man-in-the-middle attacks: `smp://<fingerprint>@<hostname>[:5223]`.

@@ -35,9 +35,11 @@ SMP server uses in-memory persistence with an optional append-only log of create

 To enable store log, initialize server using `smp-server -l` command, or modify `smp-server.ini` created during initialization (uncomment `enable: on` option in the store log section). Use `smp-server --help` for other usage tips.

+Starting from version 2.3.0, when store log is enabled, the server would also enable saving undelivered messages on exit and restoring them on start. This can be disabled via a separate setting `restore_messages` in `smp-server.ini` file. Saving messages would only work if the server is stopped with SIGINT signal (keyboard interrupt), if it is stopped with SIGTERM signal the messages would not be saved.
+
 > **Please note:** On initialization SMP server creates a chain of two certificates: a self-signed CA certificate ("offline") and a server certificate used for TLS handshake ("online"). **You should store CA certificate private key securely and delete it from the server. If server TLS credential is compromised this key can be used to sign a new one, keeping the same server identity and established connections.** CA private key location by default is `/etc/opt/simplex/ca.key`.

-SMP server implements [SMP protocol](https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md).
+SMP server implements [SMP protocol](./protocol/simplex-messaging.md).

 #### Running SMP server on MacOS

@@ -60,20 +62,21 @@ Now `openssl version` should be saying "OpenSSL". You can now run `smp-server in

 ### SMP client library

-[SMP client](https://github.com/simplex-chat/simplexmq/blob/master/src/Simplex/Messaging/Client.hs) is a Haskell library to connect to SMP servers that allows to:
+[SMP client](./src/Simplex/Messaging/Client.hs) is a Haskell library to connect to SMP servers that allows to:
+
 - execute commands with a functional API.
 - receive messages and other notifications via STM queue.
 - automatically send keep-alive commands.

 ### SMP agent

-[SMP agent library](https://github.com/simplex-chat/simplexmq/blob/master/src/Simplex/Messaging/Agent.hs) can be used to run SMP agent as part of another application and to communicate with the agent via STM queues, without serializing and parsing commands and responses.
+[SMP agent library](./src/Simplex/Messaging/Agent.hs) can be used to run SMP agent as part of another application and to communicate with the agent via STM queues, without serializing and parsing commands and responses.

-Haskell type [ACommand](https://github.com/simplex-chat/simplexmq/blob/master/src/Simplex/Messaging/Agent/Protocol.hs) represents SMP agent protocol to communicate via STM queues.
+Haskell type [ACommand](./src/Simplex/Messaging/Agent/Protocol.hs) represents SMP agent protocol to communicate via STM queues.

 See [simplex-chat](https://github.com/simplex-chat/simplex-chat) terminal UI for the example of integrating SMP agent into another application.

-[SMP agent executable](https://github.com/simplex-chat/simplexmq/blob/master/apps/smp-agent/Main.hs) can be used to run a standalone SMP agent process that implements plaintext [SMP agent protocol](https://github.com/simplex-chat/simplexmq/blob/master/protocol/agent-protocol.md) via TCP port 5224, so it can be used via telnet. It can be deployed in private networks to share access to the connections between multiple applications and services.
+[SMP agent executable](./apps/smp-agent/Main.hs) can be used to run a standalone SMP agent process that implements plaintext [SMP agent protocol](./protocol/agent-protocol.md) via TCP port 5224, so it can be used via telnet. It can be deployed in private networks to share access to the connections between multiple applications and services.

 ## Using SMP server and SMP agent

@@ -91,23 +94,107 @@ It's the easiest to try SMP agent via a prototype [simplex-chat](https://github.

 You can run your SMP server as a Linux process, optionally using a service manager for booting and restarts.

- For Ubuntu you can download a binary from [the latest release](https://github.com/simplex-chat/simplexmq/releases).
+Notice that `smp-server` requires `openssl` as run-time dependency (it is used to generate server certificates during initialization). Install it with your packet manager:

-  If you're using other Linux distribution and the binary is incompatible with it, you can build from source using [Haskell stack](https://docs.haskellstack.org/en/stable/README/):
+```sh
+# For Ubuntu
+apt update && apt install openssl
+```

-  ```shell
-  curl -sSL https://get.haskellstack.org/ | sh
-  ...
-  stack install
-  ```
+### Install binaries
+
+#### Using Docker
+
+On Linux, you can deploy smp server using Docker. This will download image from [Docker Hub](https://hub.docker.com/r/simplexchat/simplexmq).
+
+1. Create `config` and `logs` directories:
+
+   ```sh
+   mkdir -p ~/simplex/{config,logs}
+   ```
+
+2. Run your Docker container. You must change **your_ip_or_domain**. `-e pass="password"` is optional variable to password-protect your `smp` server:
+   ```sh
+   docker run -d \
+       -e addr="your_ip_or_domain" \
+       -e pass="password" \
+       -p 5223:5223 \
+       -v $HOME/simplex/config:/etc/opt/simplex:z \
+       -v $HOME/simplex/logs:/var/opt/simplex:z \
+       simplexchat/simplexmq
+   ```
+
+#### Ubuntu
+
+For Ubuntu you can download a binary from [the latest release](https://github.com/simplex-chat/simplexmq/releases).
+
+### Build from source
+
+#### Using Docker
+
+> **Please note:** to build the app use source code from [stable branch](https://github.com/simplex-chat/simplexmq/tree/stable).
+
+On Linux, you can build smp server using Docker.
+
+1. Build your `smp-server` image:
+
+   ```sh
+   git clone https://github.com/simplex-chat/simplexmq
+   cd simplexmq
+   git checkout stable
+   DOCKER_BUILDKIT=1 docker build -t smp-server -f ./build.Dockerfile .
+   ```
+
+2. Create `config` and `logs` directories:
+
+   ```sh
+   mkdir -p ~/simplex/{config,logs}
+   ```
+
+3. Run your Docker container. You must change **your_ip_or_domain**. `-e pass="password"` is optional variable to password-protect your `smp` server::
+   ```sh
+   docker run -d \
+       -e addr="your_ip_or_domain" \
+       -e pass="password" \
+       -p 5223:5223 \
+       -v $HOME/simplex/config:/etc/opt/simplex:z \
+       -v $HOME/simplex/logs:/var/opt/simplex:z \
+       smp-server
+   ```
+
+#### Using your distribution
+
+1. Install [Haskell GHCup](https://www.haskell.org/ghcup/), GHC 8.10.7 and cabal:
+
+   ```sh
+   curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | sh
+   ghcup install ghc 8.10.7
+   ghcup install cabal
+   ghcup set ghc 8.10.7
+   ghcup set cabal
+   ```
+
+2. Build the project:
+
+   ```sh
+   git clone https://github.com/simplex-chat/simplexmq
+   cd simplexmq
+   git checkout stable
+   # On Ubuntu. Depending on your distribution, use your package manager to determine package names.
+   apt-get update && apt-get install -y build-essential libgmp3-dev zlib1g-dev
+   cabal update
+   cabal install
+   ```

 - Initialize SMP server with `smp-server init [-l] -n <fqdn>` or `smp-server init [-l] --ip <ip>` - depending on how you initialize it, either FQDN or IP will be used for server's address.

 - Run `smp-server start` to start SMP server, or you can configure a service manager to run it as a service.

+- Optionally, `smp-server` can be setup for having an onion address in `tor` network. See: [`scripts/tor`](./scripts/tor/). In this case, the server address can have both public and onion hostname pointing to the same server, to allow two people connect when only one of them is using Tor. The server address would be: `smp://<fingerprint>@<public_hostname>,<onion_hostname>`
+
 See [this section](#smp-server) for more information. Run `smp-server -h` and `smp-server init -h` for explanation of commands and options.

-[<img alt="Linode" src="https://raw.githubusercontent.com/simplex-chat/simplexmq/master/img/linode.svg" align="right" width="200">](https://cloud.linode.com/stackscripts/748014)
+[<img alt="Linode" src="./img/linode.svg" align="right" width="200">](https://cloud.linode.com/stackscripts/748014)

 ## Deploy SMP server on Linode

@@ -118,11 +205,11 @@ Deployment on Linode is performed via StackScripts, which serve as recipes for L
 - Create a Linode account or login with an already existing one.
 - Open [SMP server StackScript](https://cloud.linode.com/stackscripts/748014) and click "Deploy New Linode".
 - You can optionally configure the following parameters:
-    - SMP Server store log flag for queue persistence on server restart, recommended.
-    - [Linode API token](https://www.linode.com/docs/guides/getting-started-with-the-linode-api#get-an-access-token) to attach server address etc. as tags to Linode and to add A record to your 2nd level domain (e.g. `example.com` [domain should be created](https://cloud.linode.com/domains/create) in your account prior to deployment). The API token access scopes:
-      - read/write for "linodes"
-      - read/write for "domains"
-    - Domain name to use instead of Linode IP address, e.g. `smp1.example.com`.
+  - SMP Server store log flag for queue persistence on server restart, recommended.
+  - [Linode API token](https://www.linode.com/docs/guides/getting-started-with-the-linode-api#get-an-access-token) to attach server address etc. as tags to Linode and to add A record to your 2nd level domain (e.g. `example.com` [domain should be created](https://cloud.linode.com/domains/create) in your account prior to deployment). The API token access scopes:
+    - read/write for "linodes"
+    - read/write for "domains"
+  - Domain name to use instead of Linode IP address, e.g. `smp1.example.com`.
 - Choose the region and plan, Shared CPU Nanode with 1Gb is sufficient.
 - Provide ssh key to be able to connect to your Linode via ssh. If you haven't provided a Linode API token this step is required to login to your Linode and get the server's fingerprint either from the welcome message or from the file `/etc/opt/simplex/fingerprint` after server starts. See [Linode's guide on ssh](https://www.linode.com/docs/guides/use-public-key-authentication-with-ssh/) .
 - Deploy your Linode. After it starts wait for SMP server to start and for tags to appear (if a Linode API token was provided). It may take up to 5 minutes depending on the connection speed on the Linode. Connecting Linode IP address to provided domain name may take some additional time.
@@ -131,7 +218,7 @@ Deployment on Linode is performed via StackScripts, which serve as recipes for L

 Please submit an [issue](https://github.com/simplex-chat/simplexmq/issues) if any problems occur.

-[<img alt="DigitalOcean" src="https://raw.githubusercontent.com/simplex-chat/simplexmq/master/img/digitalocean.png" align="right" width="300">](https://marketplace.digitalocean.com/apps/simplex-server)
+[<img alt="DigitalOcean" src="/img/digitalocean.png" align="right" width="300">](https://marketplace.digitalocean.com/apps/simplex-server)

 ## Deploy SMP server on DigitalOcean

@@ -159,12 +246,12 @@ smp-server init [-l] -n <fqdn>

 ## SMP server design

-![SMP server design](https://raw.githubusercontent.com/simplex-chat/simplexmq/master/design/server.svg)
+![SMP server design](./design/server.svg)

 ## SMP agent design

-![SMP agent design](https://raw.githubusercontent.com/simplex-chat/simplexmq/master/design/agent2.svg)
+![SMP agent design](./design/agent2.svg)

 ## License

-[AGPL v3](https://github.com/simplex-chat/simplexmq/blob/master/LICENSE)
+[AGPL v3](./LICENSE)
@@ -1,14 +1,7 @@
-{-# LANGUAGE NamedFieldPuns #-}
-
 module Main where

 import Control.Logger.Simple
-import Simplex.Messaging.Client.Agent (defaultSMPClientAgentConfig)
-import Simplex.Messaging.Notifications.Server (runNtfServer)
-import Simplex.Messaging.Notifications.Server.Env (NtfServerConfig (..))
-import Simplex.Messaging.Notifications.Server.Push.APNS (defaultAPNSPushClientConfig)
-import Simplex.Messaging.Server.CLI (ServerCLIConfig (..), protocolServerCLI)
-import System.FilePath (combine)
+import Simplex.Messaging.Notifications.Server.Main

 cfgPath :: FilePath
 cfgPath = "/etc/opt/simplex-notifications"
@@ -22,53 +15,4 @@ logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}
 main :: IO ()
 main = do
  setLogLevel LogDebug -- change to LogError in production
-  withGlobalLogging logCfg $ protocolServerCLI ntfServerCLIConfig runNtfServer
-
-ntfServerCLIConfig :: ServerCLIConfig NtfServerConfig
-ntfServerCLIConfig =
-  let caCrtFile = combine cfgPath "ca.crt"
-      serverKeyFile = combine cfgPath "server.key"
-      serverCrtFile = combine cfgPath "server.crt"
-   in ServerCLIConfig
-        { cfgDir = cfgPath,
-          logDir = logPath,
-          iniFile = combine cfgPath "ntf-server.ini",
-          storeLogFile = combine logPath "ntf-server-store.log",
-          caKeyFile = combine cfgPath "ca.key",
-          caCrtFile,
-          serverKeyFile,
-          serverCrtFile,
-          fingerprintFile = combine cfgPath "fingerprint",
-          defaultServerPort = "443",
-          executableName = "ntf-server",
-          serverVersion = "SMP notifications server v0.1.0",
-          mkIniFile = \enableStoreLog defaultServerPort ->
-            "[STORE_LOG]\n\
-            \# The server uses STM memory for persistence,\n\
-            \# that will be lost on restart (e.g., as with redis).\n\
-            \# This option enables saving memory to append only log,\n\
-            \# and restoring it when the server is started.\n\
-            \# Log is compacted on start (deleted objects are removed).\n\
-            \# The messages are not logged.\n"
-              <> ("enable: " <> (if enableStoreLog then "on" else "off  # on") <> "\n\n")
-              <> "[TRANSPORT]\n\
-                 \port: "
-              <> defaultServerPort
-              <> "\n\
-                 \websockets: off\n",
-          mkServerConfig = \_storeLogFile transports _ ->
-            NtfServerConfig
-              { transports,
-                subIdBytes = 24,
-                regCodeBytes = 32,
-                clientQSize = 16,
-                subQSize = 64,
-                pushQSize = 128,
-                smpAgentCfg = defaultSMPClientAgentConfig,
-                apnsConfig = defaultAPNSPushClientConfig,
-                inactiveClientExpiration = Nothing,
-                caCertificateFile = caCrtFile,
-                privateKeyFile = serverKeyFile,
-                certificateFile = serverCrtFile
-              }
-        }
+  withGlobalLogging logCfg $ ntfServerCLI cfgPath logPath
@@ -1,4 +1,5 @@
 {-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE NumericUnderscores #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE TypeApplications #-}

@@ -8,6 +9,7 @@ import Control.Logger.Simple
 import qualified Data.List.NonEmpty as L
 import Simplex.Messaging.Agent.Env.SQLite
 import Simplex.Messaging.Agent.Server (runSMPAgent)
+import Simplex.Messaging.Client (defaultNetworkConfig)
 import Simplex.Messaging.Transport (TLS, Transport (..))

 cfg :: AgentConfig
@@ -17,7 +19,8 @@ servers :: InitialAgentServers
 servers =
  InitialAgentServers
    { smp = L.fromList ["smp://bU0K-bRg24xWW__lS0umO1Zdw_SXqpJNtm1_RrPLViE=@localhost:5223"],
-      ntf = []
+      ntf = [],
+      netCfg = defaultNetworkConfig
    }

 logCfg :: LogConfig
@@ -1,19 +1,7 @@
-{-# LANGUAGE DuplicateRecordFields #-}
-{-# LANGUAGE NamedFieldPuns #-}
-{-# LANGUAGE NumericUnderscores #-}
-{-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE TypeApplications #-}
-
 module Main where

 import Control.Logger.Simple
-import Data.Ini (lookupValue)
-import Simplex.Messaging.Server (runSMPServer)
-import Simplex.Messaging.Server.CLI (ServerCLIConfig (..), protocolServerCLI, readStrictIni)
-import Simplex.Messaging.Server.Env.STM (ServerConfig (..), defaultInactiveClientExpiration, defaultMessageExpiration)
-import Simplex.Messaging.Server.Expiration
-import Simplex.Messaging.Transport (simplexMQVersion)
-import System.FilePath (combine)
+import Simplex.Messaging.Server.Main

 cfgPath :: FilePath
 cfgPath = "/etc/opt/simplex"
@@ -26,72 +14,5 @@ logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}

 main :: IO ()
 main = do
-  setLogLevel LogInfo
-  withGlobalLogging logCfg . protocolServerCLI smpServerCLIConfig $ \cfg@ServerConfig {inactiveClientExpiration} -> do
-    putStrLn $ case inactiveClientExpiration of
-      Just ExpirationConfig {ttl, checkInterval} -> "expiring clients inactive for " <> show ttl <> " seconds every " <> show checkInterval <> " seconds"
-      _ -> "not expiring inactive clients"
-    runSMPServer cfg
-
-smpServerCLIConfig :: ServerCLIConfig ServerConfig
-smpServerCLIConfig =
-  let caCrtFile = combine cfgPath "ca.crt"
-      serverKeyFile = combine cfgPath "server.key"
-      serverCrtFile = combine cfgPath "server.crt"
-   in ServerCLIConfig
-        { cfgDir = cfgPath,
-          logDir = logPath,
-          iniFile = combine cfgPath "smp-server.ini",
-          storeLogFile = combine logPath "smp-server-store.log",
-          caKeyFile = combine cfgPath "ca.key",
-          caCrtFile,
-          serverKeyFile,
-          serverCrtFile,
-          fingerprintFile = combine cfgPath "fingerprint",
-          defaultServerPort = "5223",
-          executableName = "smp-server",
-          serverVersion = "SMP server v" <> simplexMQVersion,
-          mkIniFile = \enableStoreLog defaultServerPort ->
-            "[STORE_LOG]\n\
-            \# The server uses STM memory for persistence,\n\
-            \# that will be lost on restart (e.g., as with redis).\n\
-            \# This option enables saving memory to append only log,\n\
-            \# and restoring it when the server is started.\n\
-            \# Log is compacted on start (deleted objects are removed).\n\
-            \# The messages are not logged.\n"
-              <> ("enable: " <> (if enableStoreLog then "on" else "off  # on") <> "\n\n")
-              <> "[TRANSPORT]\n"
-              <> ("port: " <> defaultServerPort <> "\n")
-              <> "websockets: off\n\n"
-              <> "[INACTIVE_CLIENTS]\n\
-                 \# TTL and interval to check inactive clients\n\
-                 \disconnect: off\n"
-              <> ("# ttl: " <> show (ttl defaultInactiveClientExpiration) <> "\n")
-              <> ("# check_interval: " <> show (checkInterval defaultInactiveClientExpiration) <> "\n"),
-          mkServerConfig = \storeLogFile transports ini ->
-            ServerConfig
-              { transports,
-                tbqSize = 16,
-                serverTbqSize = 64,
-                msgQueueQuota = 128,
-                queueIdBytes = 24,
-                msgIdBytes = 24, -- must be at least 24 bytes, it is used as 192-bit nonce for XSalsa20
-                caCertificateFile = caCrtFile,
-                privateKeyFile = serverKeyFile,
-                certificateFile = serverCrtFile,
-                storeLogFile,
-                allowNewQueues = True,
-                messageExpiration = Just defaultMessageExpiration,
-                inactiveClientExpiration =
-                  if lookupValue "INACTIVE_CLIENTS" "disconnect" ini == Right "on"
-                    then
-                      Just
-                        ExpirationConfig
-                          { ttl = readStrictIni "INACTIVE_CLIENTS" "ttl" ini,
-                            checkInterval = readStrictIni "INACTIVE_CLIENTS" "check_interval" ini
-                          }
-                    else Nothing,
-                logStatsInterval = Just 86400, -- seconds
-                logStatsStartTime = 0 -- seconds from 00:00 UTC
-              }
-        }
+  setLogLevel LogDebug
+  withGlobalLogging logCfg $ smpServerCLI cfgPath logPath
@@ -0,0 +1,51 @@
+FROM ubuntu:focal AS final
+FROM ubuntu:focal AS build
+
+### Build stage
+
+# Install curl and git and smp-related dependencies
+RUN apt-get update && apt-get install -y curl git build-essential libgmp3-dev zlib1g-dev
+
+# Install ghcup
+RUN curl https://downloads.haskell.org/~ghcup/x86_64-linux-ghcup -o /usr/bin/ghcup && \
+    chmod +x /usr/bin/ghcup
+
+# Install ghc
+RUN ghcup install ghc 8.10.7
+# Install cabal
+RUN ghcup install cabal
+# Set both as default
+RUN ghcup set ghc 8.10.7 && \
+    ghcup set cabal
+
+COPY . /project
+WORKDIR /project
+
+# Adjust PATH
+ENV PATH="/root/.cabal/bin:/root/.ghcup/bin:$PATH"
+
+# Compile smp-server
+RUN cabal update
+RUN cabal install
+
+### Final stage
+
+FROM final
+
+# Install OpenSSL dependency
+RUN apt-get update && apt-get install -y openssl
+
+# Copy compiled smp-server from build stage
+COPY --from=build /root/.cabal/bin/smp-server /usr/bin/smp-server
+
+# Copy our helper script
+COPY ./scripts/docker/entrypoint /usr/bin/entrypoint
+
+# Open smp-server listening port
+EXPOSE 5223
+
+# SimpleX requires using SIGINT to correctly preserve undelivered messages and restore them on restart
+STOPSIGNAL SIGINT
+
+# Finally, execute helper script
+ENTRYPOINT [ "/usr/bin/entrypoint" ]
@@ -1,6 +1,17 @@
 packages: .
+-- packages: . ../direct-sqlcipher ../sqlcipher-simple

 source-repository-package
    type: git
    location: https://github.com/simplex-chat/aeson.git
    tag: 3eb66f9a68f103b5f1489382aad89f5712a64db7
+
+source-repository-package
+    type: git
+    location: https://github.com/simplex-chat/direct-sqlcipher.git
+    tag: 34309410eb2069b029b8fc1872deb1e0db123294
+
+source-repository-package
+    type: git
+    location: https://github.com/simplex-chat/sqlcipher-simple.git
+    tag: 5e154a2aeccc33ead6c243ec07195ab673137221
@@ -0,0 +1,20 @@
+FROM ubuntu:focal
+
+# Install curl
+RUN apt-get update && apt-get install -y curl
+
+# Download latest smp-server release and assign executable permission
+RUN curl -L https://github.com/simplex-chat/simplexmq/releases/latest/download/smp-server-ubuntu-20_04-x86-64 -o /usr/bin/smp-server && \
+	chmod +x /usr/bin/smp-server
+
+# Copy our helper script
+COPY ./scripts/docker/entrypoint /usr/bin/entrypoint
+
+# Open smp-server listening port
+EXPOSE 5223
+
+# SimpleX requires using SIGINT to correctly preserve undelivered messages and restore them on restart
+STOPSIGNAL SIGINT
+
+# Finally, execute helper script
+ENTRYPOINT [ "/usr/bin/entrypoint" ]
@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 506.94 131.5"><path d="m109.65 58.21-18.21-10.07-15.37 9.38-.19 9.59-7.47-4.92-10.16 6.19-.44-10.48-10.48-7 10-5.17c-.08 0 0 1-1.48-34.34l-23.65-11.39-32.2 10 7.19 34.63 10.81 8.37-8.22 3.9 5.37 26.1 7.55 7.09-5.4 3.29 4.19 20.18 16.94 17.94c.08-.1 1.78-1.41 21.79-17.32l-.58-13.71 8.58 7.28c.12-.12 1.84-1.39 17.56-13.89l.61-10.14 6.48 4.5c.13-.12 1.58-1.22 14.26-11.33z" fill="#231f20"/><path d="m94.54 69 15.11-10.79-18.21-10.07-15.37 9.38z"/><path d="m92.87 88.2 1.67-19.2-18.47-11.48-.38 18.75z" fill="#004b16"/><path d="m68.22 107.73v-19.89l-18.66-14.15 1.47 19.54z" fill="#004b16"/><path d="m68.22 87.84 18.74-13.43-18.55-12.22-18.85 11.5z"/><path d="m38.43 131.48-2.98-20.32-18.15-17.8 4.19 20.18z" fill="#004b16"/><path d="m35.45 111.16 23.91-17.06-18.53-15.09-23.53 14.35z"/><path d="m33.9 100.6-3.94-26.88-20.22-16.81 5.41 26.07z" fill="#004b16"/><path d="m29.96 73.72 27.85-15.82-20.8-13.94-27.27 12.95z"/><path d="m28.07 60.88-5.4-36.81-22.67-14.06 7.19 34.62z" fill="#004b16"/><path d="m22.67 24.07 33.14-12.7-23.61-11.37-32.2 10.01z"/><g fill="#1cb35c"><path d="m107.13 76.87c-14.02 11.13-14.33 11.33-14.26 11.33 1.74-20.1 1.59-19.2 1.67-19.2 16-11.45 15-10.79 15.11-10.79z"/><path d="m85.78 93.84c-17.35 13.8-17.63 13.89-17.56 13.89-.17-20.82-.07-19.89 0-19.89 20-14.3 18.67-13.43 18.74-13.43z"/><path d="m60.22 114.16c-21.66 17.22-21.86 17.32-21.79 17.32-3.07-20.94-3-20.32-3-20.32 25.47-18.16 23.86-17.06 23.93-17.06z"/><path d="m55.81 11.37c1.52 35.37 1.4 34.34 1.48 34.34-28.66 14.89-29.29 15.17-29.22 15.17-5.52-37.63-5.47-36.81-5.4-36.81z"/><path d="m57.81 57.9c1.15 26.81 1 25.88 1.11 25.88-24.81 16.67-25.09 16.82-25 16.82-4-27.58-4-26.88-3.94-26.88z"/></g><path xmlns="http://www.w3.org/2000/svg" d="m151.61 14.24 16.58-4v79.88q0 13.13 7.83 15.65-3.84 7.31-13.13 7.3-11.28 0-11.28-15.66z"/><path d="m186.66 111.72v-57.42h-9.08v-13.6h25.86v71zm8.56-98.54a9.62 9.62 0 1 1 -9.62 9.62 9.63 9.63 0 0 1 9.62-9.62z"/><path d="m262.94 111.74v-41.06c0-6.05-1.16-10.48-3.48-13.26s-6.11-4.18-11.37-4.18a17.74 17.74 0 0 0 -7.8 2.06 18 18 0 0 0 -6.46 5.1v51.34h-16.59v-71h11.94l3 6.64q6.76-8 20-8 12.66 0 20 7.59t7.33 21.19v43.58z"/><path d="m288.42 76.06q0-16.26 9.38-26.47t24.77-10.21q16.19 0 25.14 9.82t9 26.86q0 17-9.12 27t-25 10q-16.18 0-25.17-10.12t-9-26.88zm17.24 0q0 23.47 16.91 23.48a14.54 14.54 0 0 0 12.31-6.11q4.55-6.09 4.54-17.37 0-23.14-16.85-23.15a14.61 14.61 0 0 0 -12.33 6.09q-4.58 6.11-4.58 17.06z"/><path d="m412.37 111.74v-4.31c-1.37 1.5-3.71 2.82-7 3.95a31.33 31.33 0 0 1 -10.15 1.69q-14.87 0-23.38-9.42t-8.52-26.27q0-16.84 9.78-27.42a32 32 0 0 1 24.51-10.58 32.37 32.37 0 0 1 14.72 3.32v-28.46l16.58-4v101.5zm0-54.06a17.6 17.6 0 0 0 -11.07-4.24q-10 0-15.33 6.07t-5.37 17.41q0 22.15 21.36 22.15a16.11 16.11 0 0 0 5.87-1.42c2.32-1 3.83-1.92 4.54-2.89z"/><path d="m505.55 81.3h-50.74q.46 8.49 5.83 13.2t14.46 4.7q11.34 0 17.25-5.9l6.43 12.7q-8.75 7.09-26.13 7.1-16.25 0-25.7-9.52t-9.45-26.58q0-16.78 10.38-27.2a33.91 33.91 0 0 1 24.9-10.41q15.45 0 24.81 9.22t9.35 23.48a46.28 46.28 0 0 1 -1.39 9.21zm-50.15-12.47h34.89q-1.73-15.58-17.24-15.59-14.2 0-17.65 15.59z"/></svg>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 506.94 131.5"><path d="m109.65 58.21-18.21-10.07-15.37 9.38-.19 9.59-7.47-4.92-10.16 6.19-.44-10.48-10.48-7 10-5.17c-.08 0 0 1-1.48-34.34l-23.65-11.39-32.2 10 7.19 34.63 10.81 8.37-8.22 3.9 5.37 26.1 7.55 7.09-5.4 3.29 4.19 20.18 16.94 17.94c.08-.1 1.78-1.41 21.79-17.32l-.58-13.71 8.58 7.28c.12-.12 1.84-1.39 17.56-13.89l.61-10.14 6.48 4.5c.13-.12 1.58-1.22 14.26-11.33z" fill="#231f20"/><path d="m94.54 69 15.11-10.79-18.21-10.07-15.37 9.38z"/><path d="m92.87 88.2 1.67-19.2-18.47-11.48-.38 18.75z" fill="#004b16"/><path d="m68.22 107.73v-19.89l-18.66-14.15 1.47 19.54z" fill="#004b16"/><path d="m68.22 87.84 18.74-13.43-18.55-12.22-18.85 11.5z"/><path d="m38.43 131.48-2.98-20.32-18.15-17.8 4.19 20.18z" fill="#004b16"/><path d="m35.45 111.16 23.91-17.06-18.53-15.09-23.53 14.35z"/><path d="m33.9 100.6-3.94-26.88-20.22-16.81 5.41 26.07z" fill="#004b16"/><path d="m29.96 73.72 27.85-15.82-20.8-13.94-27.27 12.95z"/><path d="m28.07 60.88-5.4-36.81-22.67-14.06 7.19 34.62z" fill="#004b16"/><path d="m22.67 24.07 33.14-12.7-23.61-11.37-32.2 10.01z"/><g fill="#1cb35c"><path d="m107.13 76.87c-14.02 11.13-14.33 11.33-14.26 11.33 1.74-20.1 1.59-19.2 1.67-19.2 16-11.45 15-10.79 15.11-10.79z"/><path d="m85.78 93.84c-17.35 13.8-17.63 13.89-17.56 13.89-.17-20.82-.07-19.89 0-19.89 20-14.3 18.67-13.43 18.74-13.43z"/><path d="m60.22 114.16c-21.66 17.22-21.86 17.32-21.79 17.32-3.07-20.94-3-20.32-3-20.32 25.47-18.16 23.86-17.06 23.93-17.06z"/><path d="m55.81 11.37c1.52 35.37 1.4 34.34 1.48 34.34-28.66 14.89-29.29 15.17-29.22 15.17-5.52-37.63-5.47-36.81-5.4-36.81z"/><path d="m57.81 57.9c1.15 26.81 1 25.88 1.11 25.88-24.81 16.67-25.09 16.82-25 16.82-4-27.58-4-26.88-3.94-26.88z"/></g><path xmlns="http://www.w3.org/2000/svg" d="m151.61 14.24 16.58-4v79.88q0 13.13 7.83 15.65-3.84 7.31-13.13 7.3-11.28 0-11.28-15.66z"/><path d="m186.66 111.72v-57.42h-9.08v-13.6h25.86v71zm8.56-98.54a9.62 9.62 0 1 1 -9.62 9.62 9.63 9.63 0 0 1 9.62-9.62z"/><path d="m262.94 111.74v-41.06c0-6.05-1.16-10.48-3.48-13.26s-6.11-4.18-11.37-4.18a17.74 17.74 0 0 0 -7.8 2.06 18 18 0 0 0 -6.46 5.1v51.34h-16.59v-71h11.94l3 6.64q6.76-8 20-8 12.66 0 20 7.59t7.33 21.19v43.58z"/><path d="m288.42 76.06q0-16.26 9.38-26.47t24.77-10.21q16.19 0 25.14 9.82t9 26.86q0 17-9.12 27t-25 10q-16.18 0-25.17-10.12t-9-26.88zm17.24 0q0 23.47 16.91 23.48a14.54 14.54 0 0 0 12.31-6.11q4.55-6.09 4.54-17.37 0-23.14-16.85-23.15a14.61 14.61 0 0 0 -12.33 6.09q-4.58 6.11-4.58 17.06z"/><path d="m412.37 111.74v-4.31c-1.37 1.5-3.71 2.82-7 3.95a31.33 31.33 0 0 1 -10.15 1.69q-14.87 0-23.38-9.42t-8.52-26.27q0-16.84 9.78-27.42a32 32 0 0 1 24.51-10.58 32.37 32.37 0 0 1 14.72 3.32v-28.46l16.58-4v101.5zm0-54.06a17.6 17.6 0 0 0 -11.07-4.24q-10 0-15.33 6.07t-5.37 17.41q0 22.15 21.36 22.15a16.11 16.11 0 0 0 5.87-1.42c2.32-1 3.83-1.92 4.54-2.89z"/><path d="m505.55 81.3h-50.74q.46 8.49 5.83 13.2t14.46 4.7q11.34 0 17.25-5.9l6.43 12.7q-8.75 7.09-26.13 7.1-16.25 0-25.7-9.52t-9.45-26.58q0-16.78 10.38-27.2a33.91 33.91 0 0 1 24.9-10.41q15.45 0 24.81 9.22t9.35 23.48a46.28 46.28 0 0 1 -1.39 9.21zm-50.15-12.47h34.89q-1.73-15.58-17.24-15.59-14.2 0-17.65 15.59z"/></svg>
@@ -1,5 +1,5 @@
 name: simplexmq
-version: 2.1.1
+version: 4.2.2
 synopsis: SimpleXMQ message broker
 description: |
  This package includes <./docs/Simplex-Messaging-Server.html server>,
@@ -28,7 +28,7 @@ dependencies:
  - asn1-types == 0.3.*
  - async == 2.2.*
  - attoparsec == 0.14.*
-  - base >= 4.7 && < 5
+  - base >= 4.14 && < 5
  - base64-bytestring >= 1.0 && < 1.3
  - bytestring == 0.10.*
  - case-insensitive == 1.2.*
@@ -38,30 +38,32 @@ dependencies:
  - cryptonite >= 0.27 && < 0.30
  - cryptostore == 0.2.*
  - data-default == 0.7.*
-  - direct-sqlite == 2.3.*
+  - direct-sqlcipher == 2.3.*
  - directory == 1.3.*
  - filepath == 1.4.*
  - http-types == 0.12.*
  - http2 == 3.0.*
  - generic-random >= 1.3 && < 1.5
-  - ini == 0.4.*
+  - ini == 0.4.1
  - iso8601-time == 0.1.*
  - memory == 0.15.*
  - mtl == 2.2.*
-  - network == 3.1.2.*
-  - network-transport == 0.5.*
+  - network >= 3.1.2.7 && < 3.2
+  - network-transport == 0.5.4
  - optparse-applicative >= 0.15 && < 0.17
  - QuickCheck == 2.14.*
  - process == 1.6.*
  - random >= 1.1 && < 1.3
  - simple-logger == 0.1.*
-  - sqlite-simple == 0.4.*
+  - socks == 0.6.*
+  - sqlcipher-simple == 0.4.*
  - stm == 2.5.*
  - template-haskell == 2.16.*
  - text == 1.2.*
  - time == 1.9.*
+  - time-compat == 1.9.*
  - time-manager == 0.0.*
-  - tls >= 1.5.7 && < 1.6
+  - tls >= 1.6.0 && < 1.7
  - transformers == 0.5.*
  - unliftio == 0.2.*
  - unliftio-core == 0.2.*
@@ -119,6 +121,8 @@ tests:
      - hspec-core == 2.7.*
      - HUnit == 1.6.*
      - QuickCheck == 2.14.*
+      - silently == 1.2.*
+      - main-tester == 0.2.*
      - timeit == 2.0.*

 ghc-options:
@@ -0,0 +1,71 @@
+sequenceDiagram
+  participant A as Alice
+  participant AA as Alice's<br>agent
+  participant AS as Alice's<br>server
+  participant BS as Bob's<br>server
+  participant BA as Bob's<br>agent
+  participant B as Bob
+
+  note over AA, BA: status (receive/send): NONE/NONE
+
+  note over A, AA: 1. request connection<br>from agent
+  A ->> AA: NEW: create<br>duplex connection
+ 
+  note over AA, AS: 2. create Alice's SMP queue
+  AA ->> AS: NEW: create SMP queue
+  AS ->> AA: IDS: SMP queue IDs
+  note over AA: status: NEW/NONE
+
+  AA ->> A: INV: invitation<br>to connect
+
+  note over A, B: 3. out-of-band invitation
+  A ->> B: OOB: invitation to connect
+
+  note over BA, B: 4. accept connection
+  B ->> BA: JOIN:<br>via invitation info
+  note over BA: status: NONE/NEW
+
+  note over BA, BS: 5. create Bob's SMP queue
+  BA ->> BS: NEW: create SMP queue
+  BS ->> BA: IDS: SMP queue IDs
+  note over BA: status: NEW/NEW
+
+  note over BA, AA: 6. establish Alice's SMP queue
+  BA ->> AS: SEND: Bob's info and sender server key (SMP confirmation with reply queues)
+  note over BA: status: NEW/CONFIRMED
+
+  AS ->> AA: MSG: Bob's info and<br>sender server key
+  note over AA: status: CONFIRMED/NONE
+  AA ->> AS: ACK: confirm message
+  AA ->> A: CONF: connection request ID<br>and Bob's info
+  A ->> AA: LET: accept connection request,<br>send Alice's info
+  AA ->> AS: KEY: secure queue
+  note over AA: status: SECURED/NONE
+
+  AA ->> BS: SEND: Alice's info and sender's server key (SMP confirmation without reply queues)
+  note over AA: status: SECURED/CONFIRMED
+
+  BS ->> BA: MSG: Alice's info and<br>sender's server key
+  note over BA: status: CONFIRMED/CONFIRMED
+  BA ->> B: INFO: Alice's info
+  BA ->> BS: ACK: confirm message
+  BA ->> BS: KEY: secure queue
+  note over BA: status: SECURED/CONFIRMED
+
+  BA ->> AS: SEND: HELLO: only needs to be sent once in v2
+
+  note over BA: status: SECURED/ACTIVE
+  note over BA, B: 7a. notify Bob<br>about connection success
+  BA ->> B: CON: connected
+
+  AS ->> AA: MSG: HELLO: Alice's agent<br>knows Bob can send
+  note over AA: status: SECURED/ACTIVE
+  AA ->> AS: ACK: confirm message
+  note over A, AA: 7a. notify Alice<br>about connection success
+  AA ->> A: CON: connected
+
+  AA ->> BS: SEND: HELLO: only needs to be sent once in v2
+  note over AA: status: ACTIVE/ACTIVE
+  BS ->> BA: MSG: HELLO: Bob's agent<br>knows Alice can send
+  note over BA: status: ACTIVE/ACTIVE
+  BA ->> BS: ACK: confirm message
@@ -33,8 +33,8 @@ sequenceDiagram
  AS ->> AA: MSG: Bob's info and<br>sender server key
  note over AA: status: CONFIRMED/NONE
  AA ->> AS: ACK: confirm message
-  AA ->> A: REQ: connection request ID<br>and Bob's info
-  A ->> AA: ACPT: accept connection request,<br>send Alice's info
+  AA ->> A: CONF: connection request ID<br>and Bob's info
+  A ->> AA: LET: accept connection request,<br>send Alice's info
  AA ->> AS: KEY: secure queue
  note over AA: status: SECURED/NONE

@@ -0,0 +1,40 @@
+sequenceDiagram
+  participant M as mobile app
+  participant C as chat core
+  participant A as agent
+  participant S as SMP server
+  participant N as NTF server
+  participant APN as APN
+
+  note over M, APN: register subscription
+
+  alt register existing
+    M -->> A: on /_ntf register, for subscribed queues
+  else create new connection
+    A -->> S: NEW / JOIN
+    note over A, S: ...<br>Connection handshake<br>...
+    S -->> A: CON
+  end
+  A ->> S: NKEY nKey
+  S ->> A: NID nId
+  A ->> N: SNEW tknId dhKey (smpServer, nId, nKey)
+  N ->> A: ID subId dhKey
+  N ->> S: NSUB nId
+  S ->> N: OK [/ NMSG]
+
+  note over M, APN: notify about message
+
+  S ->> N: NMSG
+  N ->> APN: APNSMutableContent<br>ntfQueue, nonce
+  APN ->> M: UNMutableNotificationContent
+  note over M, S: ...<br>Client awaken, message is received<br>...
+  S ->> M: message
+  note over M: mutate notification
+
+  note over M, APN: change APN token
+
+  APN ->> M: new device token
+  M -->> C: /_ntf_sub update tkn
+  C -->> A: updateNtfToken()
+  A -->> N: TUPD tknId newDeviceToken
+  note over M, N: ...<br>Verify token<br>...
@@ -24,6 +24,7 @@
    - [Subscribe to queue](#subscribe-to-queue)
    - [Secure queue command](#secure-queue-command)
    - [Enable notifications command](#enable-notifications-command)
+    - [Disable notifications command](#disable-notifications-command)
    - [Acknowledge message delivery](#acknowledge-message-delivery)
    - [Suspend queue](#suspend-queue)
    - [Delete queue](#delete-queue)
@@ -50,6 +51,8 @@ It's designed with the focus on communication security and integrity, under the

 It is designed as a low level protocol for other application protocols to solve the problem of secure and private message transmission, making [MITM attack][1] very difficult at any part of the message transmission system.

+This document describes SMP protocol versions 3 and 4, the previous versions are discontinued.
+
 ## Introduction

 The objective of Simplex Messaging Protocol (SMP) is to facilitate the secure and private unidirectional transfer of messages from senders to recipients via persistent simplex queues managed by the message broker (server).
@@ -146,61 +149,61 @@ To create and start using a simplex queue Alice and Bob follow these steps:

 1. Alice creates a simplex queue on the server:

-    1. Decides which SMP server to use (can be the same or different server that Alice uses for other queues) and opens secure encrypted transport connection to the chosen SMP server (see [Appendix A](#appendix-a)).
+   1. Decides which SMP server to use (can be the same or different server that Alice uses for other queues) and opens secure encrypted transport connection to the chosen SMP server (see [Appendix A](#appendix-a)).

-    2. Generates a new random public/private key pair (encryption key - `EK`) that she did not use before for Bob to encrypt the messages.
+   2. Generates a new random public/private key pair (encryption key - `EK`) that she did not use before for Bob to encrypt the messages.

-    3. Generates another new random public/private key pair (recipient key - `RK`) that she did not use before for her to sign commands and to decrypt the transmissions received from the server.
+   3. Generates another new random public/private key pair (recipient key - `RK`) that she did not use before for her to sign commands and to decrypt the transmissions received from the server.

-    4. Generates one more random key pair (recipient DH key - `RDHK`) to negotiate symmetric key that will be used by the server to encrypt message bodies delivered to Alice (to avoid shared cipher-text inside transport connection).
+   4. Generates one more random key pair (recipient DH key - `RDHK`) to negotiate symmetric key that will be used by the server to encrypt message bodies delivered to Alice (to avoid shared cipher-text inside transport connection).

-    5. Sends `"NEW"` command to the server to create a simplex queue (see `create` in [Create queue command](#create-queue-command)). This command contains previously generated unique "public" keys `RK` and `RDHK`. `RK` will be used to verify the following commands related to the same queue signed by its private counterpart, for example to subscribe to the messages received to this queue or to update the queue, e.g. by setting the key required to send the messages (initially Alice creates the queue that accepts unsigned messages, so anybody could send the message via this queue if they knew the queue sender's ID and server address).
+   5. Sends `"NEW"` command to the server to create a simplex queue (see `create` in [Create queue command](#create-queue-command)). This command contains previously generated unique "public" keys `RK` and `RDHK`. `RK` will be used to verify the following commands related to the same queue signed by its private counterpart, for example to subscribe to the messages received to this queue or to update the queue, e.g. by setting the key required to send the messages (initially Alice creates the queue that accepts unsigned messages, so anybody could send the message via this queue if they knew the queue sender's ID and server address).

-    6. The server sends `"IDS"` response with queue IDs (`queueIds`):
+   6. The server sends `"IDS"` response with queue IDs (`queueIds`):

-        - Recipient ID `RID` for Alice to manage the queue and to receive the messages.
+      - Recipient ID `RID` for Alice to manage the queue and to receive the messages.

-        - Sender ID `SID` for Bob to send messages to the queue.
+      - Sender ID `SID` for Bob to send messages to the queue.

-        - Server public DH key (`SDHK`) to negotiate a shared secret for message body encryption, that Alice uses to derive a shared secret with the server `SS`.
+      - Server public DH key (`SDHK`) to negotiate a shared secret for message body encryption, that Alice uses to derive a shared secret with the server `SS`.

 2. Alice sends an out-of-band message to Bob via the alternative channel that both Alice and Bob trust (see [protocol abstract](#simplex-messaging-protocol-abstract)). The message must include:

-    - Unique "public" key (`EK`) that Bob must use for E2E key agreement.
+   - Unique "public" key (`EK`) that Bob must use for E2E key agreement.

-    - SMP server hostname and information to open secure encrypted transport connection (see [Appendix A](#appendix-a)).
+   - SMP server hostname and information to open secure encrypted transport connection (see [Appendix A](#appendix-a)).

-    - Sender queue ID `SID` for Bob to use.
+   - Sender queue ID `SID` for Bob to use.

 3. Bob, having received the out-of-band message from Alice, connects to the queue:

-    1. Generates a new random public/private key pair (sender key - `SK`) that he did not use before for him to sign messages sent to Alice's server.
+   1. Generates a new random public/private key pair (sender key - `SK`) that he did not use before for him to sign messages sent to Alice's server.

-    2. Prepares the confirmation message for Alice to secure the queue. This message includes:
+   2. Prepares the confirmation message for Alice to secure the queue. This message includes:

-        - Previously generated "public" key `SK` that will be used by Alice's server to authenticate Bob's messages, once the queue is secured.
+      - Previously generated "public" key `SK` that will be used by Alice's server to authenticate Bob's messages, once the queue is secured.

-        - Optionally, any additional information (application specific, e.g. Bob's profile name and details).
+      - Optionally, any additional information (application specific, e.g. Bob's profile name and details).

-    3. Encrypts the confirmation body with the "public" key `EK` (that Alice provided via the out-of-band message).
+   3. Encrypts the confirmation body with the "public" key `EK` (that Alice provided via the out-of-band message).

-    4. Sends the encrypted message to the server with queue ID `SID` (see `send` in [Send message](#send-message)). This initial message to the queue must not be signed - signed messages will be rejected until Alice secures the queue (below).
+   4. Sends the encrypted message to the server with queue ID `SID` (see `send` in [Send message](#send-message)). This initial message to the queue must not be signed - signed messages will be rejected until Alice secures the queue (below).

 4. Alice receives Bob's message from the server using recipient queue ID `RID` (possibly, via the same transport connection she already has opened - see `message` in [Deliver queue message](#deliver-queue-message)):

-    1. She decrypts received message body using the secret `SS`.
+   1. She decrypts received message body using the secret `SS`.

-    2. She decrypts received message with [key agreed with sender using] "private" key `EK`.
+   2. She decrypts received message with [key agreed with sender using] "private" key `EK`.

-    3. Even though anybody could have sent the message to the queue with ID `SID` before it is secured (e.g. if communication is compromised), Alice would ignore all messages until the decryption succeeds (i.e. the result contains the expected message format). Optionally, in the client application, she also may identify Bob using the information provided, but it is out of scope of SMP protocol.
+   3. Even though anybody could have sent the message to the queue with ID `SID` before it is secured (e.g. if communication is compromised), Alice would ignore all messages until the decryption succeeds (i.e. the result contains the expected message format). Optionally, in the client application, she also may identify Bob using the information provided, but it is out of scope of SMP protocol.

 5. Alice secures the queue `RID` with `"KEY"` command so only Bob can send messages to it (see [Secure queue command](#secure-queue-command)):

-    1. She sends the `KEY` command with `RID` signed with "private" key `RK` to update the queue to only accept requests signed by "private" key `SK` provided by Bob. This command contains unique "public" key `SK` previously generated by Bob.
+   1. She sends the `KEY` command with `RID` signed with "private" key `RK` to update the queue to only accept requests signed by "private" key `SK` provided by Bob. This command contains unique "public" key `SK` previously generated by Bob.

-    2. From this moment the server will accept only signed commands to `SID`, so only Bob will be able to send messages to the queue `SID` (corresponding to `RID` that Alice has).
+   2. From this moment the server will accept only signed commands to `SID`, so only Bob will be able to send messages to the queue `SID` (corresponding to `RID` that Alice has).

-    3. Once queue is secured, Alice deletes `SID` and `SK` - even if Alice's client is compromised in the future, the attacker would not be able to send messages pretending to be Bob.
+   3. Once queue is secured, Alice deletes `SID` and `SK` - even if Alice's client is compromised in the future, the attacker would not be able to send messages pretending to be Bob.

 6. The simplex queue `RID` is now ready to be used.

@@ -214,21 +217,21 @@ Bob now can securely send messages to Alice:

 1. Bob sends the message:

-    1. He encrypts the message to Alice with "public" key `EK` (provided by Alice, only known to Bob, used only for one simplex queue).
+   1. He encrypts the message to Alice with "public" key `EK` (provided by Alice, only known to Bob, used only for one simplex queue).

-    2. He signs `"SEND"` command to the server queue `SID` using the "private" key `SK` (that only he knows, used only for this queue).
+   2. He signs `"SEND"` command to the server queue `SID` using the "private" key `SK` (that only he knows, used only for this queue).

-    3. He sends the command to the server (see `send` in [Send message](#send-message)), that the server will authenticate using the "public" key `SK` (that Alice earlier received from Bob and provided to the server via `"KEY"` command).
+   3. He sends the command to the server (see `send` in [Send message](#send-message)), that the server will authenticate using the "public" key `SK` (that Alice earlier received from Bob and provided to the server via `"KEY"` command).

 2. Alice receives the message(s):

-    1. She signs `"SUB"` command to the server to subscribe to the queue `RID` with the "private" key `RK` (see `subscribe` in [Subscribe to queue](#subscribe-to-queue)).
+   1. She signs `"SUB"` command to the server to subscribe to the queue `RID` with the "private" key `RK` (see `subscribe` in [Subscribe to queue](#subscribe-to-queue)).

-    2. The server, having authenticated Alice's command with the "public" key `RK` that she provided, delivers Bob's message(s) (see `message` in [Deliver queue message](#deliver-queue-message)).
+   2. The server, having authenticated Alice's command with the "public" key `RK` that she provided, delivers Bob's message(s) (see `message` in [Deliver queue message](#deliver-queue-message)).

-    3. She decrypts Bob's message(s) with the "private" key `EK` (that only she has).
+   3. She decrypts Bob's message(s) with the "private" key `EK` (that only she has).

-    4. She acknowledges the message reception to the server with `"ACK"` so that the server can delete the message and deliver the next messages.
+   4. She acknowledges the message reception to the server with `"ACK"` so that the server can delete the message and deliver the next messages.

 This flow is show on sequence diagram below.

@@ -355,18 +358,22 @@ To protect the privacy of the recipients, there are several commands in SMP prot
 The clients can optionally instruct a dedicated push notification server to subscribe to notifications and deliver push notifications to the device, which can then retrieve the messages in the background and send local notifications to the user - this is out of scope of SMP protocol. The commands that SMP protocol provides to allow it:

 - `enableNotifications` (`"NKEY"`) with `notifierId` (`"NID"`) response - see [Enable notifications command](#enable-notifications-command).
+- `disableNotifications` (`"NDEL"`) - see [Disable notifications command](#disable-notifications-command).
 - `subscribeNotifications` (`"NSUB"`) - see [Subscribe to queue notifications](#subscribe-to-queue-notifications).
 - `messageNotification` (`"NMSG"`) - see [Deliver message notification](#deliver-message-notification).

-## SMP Transmission structure
+[`SEND` command](#send-message) includes the notification flag to instruct SMP server whether to send the notification - this flag is forwarded to the recepient inside encrypted envelope, together with the timestamp and the message body, so even if TLS is compromised this flag cannot be used for traffic correlation.
+
+## SMP Transmission andtransport block structure

 Each transport block (SMP transmission) has a fixed size of 16384 bytes for traffic uniformity.

+From SMP version 4 each block can contain multiple transmissions, version 3 blocks have 1 transmission.
 Some parts of SMP transmission are padded to a fixed size; this padding is uniformly added as a word16 encoded in network byte order - see `paddedString` syntax.

 In places where some part of the transmission should be padded, the syntax for `paddedNotation` is used:

-```
+```abnf
 paddedString = originalLength string pad
 originalLength = 2*2 OCTET
 pad = N*N"#" ; where N = paddedLength - originalLength - 2
@@ -376,9 +383,9 @@ paddedNotation = <padded(string, paddedLength)>
 ; paddedLength - required length after padding, including 2 bytes for originalLength
 ```

-Each transmission between the client and the server must have this format/syntax:
+Each transmission/block for SMP v3 between the client and the server must have this format/syntax:

-```
+```abnf
 paddedTransmission = <padded(transmission), 16384>
 transmission = [signature] SP signed
 signed = sessionIdentifier SP [corrId] SP [queueId] SP smpCommand
@@ -395,13 +402,23 @@ encoded = <base64 encoded binary>

 `base64` encoding should be used with padding, as defined in section 4 of [RFC 4648][9]

+Transport block for SMP v4 has this syntax:
+
+```abnf
+paddedTransportBlock = <padded(transportBlock), 16384>
+transportBlock = transmissionCount transmissions
+transmissionCount = 1*1 OCTET ; equal or greater than 1
+transmissions = transmissionLength transmission [transmissions]
+transmissionLength = 2*2 OCTET ; word16 encoded in network byte order
+```
+
 ## SMP commands

 Commands syntax below is provided using [ABNF][8] with [case-sensitive strings extension][8a].

 ```abnf
 smpCommand = ping / recipientCmd / send / subscribeNotifications / serverMsg
-recipientCmd = create / subscribe / secure / enableNotifications /
+recipientCmd = create / subscribe / secure / enableNotifications / disableNotifications /
               acknowledge / suspend / delete
 serverMsg = queueIds / message / notifierId / messageNotification /
            unsubscribed / ok / error
@@ -502,22 +519,42 @@ Once the queue is secured only signed messages can be sent to it.
 This command is sent by the recipient to the server to add notifier's key to the queue, to allow push notifications server to receive notifications when the message arrives, via a separate queue ID, without receiving message content.

 ```abnf
-enableNotifications = %s"NKEY " notifierKey
+enableNotifications = %s"NKEY " notifierKey recipientNotificationDhPublicKey
 notifierKey = length x509encoded
 ; the notifier's Ed25519 or Ed448 public key public key to verify NSUB command for this queue
+
+recipientNotificationDhPublicKey = length x509encoded
+; the recipient's Curve25519 key for DH exchange to derive the secret
+; that the server will use to encrypt notification metadata (encryptedNMsgMeta in NMSG)
+; using [NaCl crypto_box][16] encryption scheme (curve25519xsalsa20poly1305).
 ```

 The server will respond with `notifierId` response if notifications were enabled and the notifier's key was successfully added to the queue:

 ```abnf
-notifierId = %s"NID " notifierId
+notifierId = %s"NID " notifierId srvNotificationDhPublicKey
 notifierId = length *OCTET ; 16-24 bytes
+srvNotificationDhPublicKey = length x509encoded
+; the server's Curve25519 key for DH exchange to derive the secret
+; that the server will use to encrypt notification metadata to the recipient (encryptedNMsgMeta in NMSG)
 ```

 This response is sent with the recipient's queue ID (the third part of the transmission).

 To receive the message notifications, `subscribeNotifications` command ("NSUB") must be sent signed with the notifier's key.

+#### Disable notifications command
+
+This command is sent by the recipient to the server to remove notifier's credentials from the queue:
+
+```abnf
+disableNotifications = %s"NDEL"
+```
+
+The server must respond `ok` to this command if it was successful.
+
+Once notifier's credentials are removed server will no longer send "NMSG" for this queue to notifier.
+
 #### Acknowledge message delivery

 The recipient should send the acknowledgement of message delivery once the message was stored in the client, to notify the server that the message should be deleted:
@@ -565,7 +602,9 @@ Currently SMP defines only one command that can be used by senders - `send` mess
 This command is sent to the server by the sender both to confirm the queue after the sender received out-of-band message from the recipient and to send messages after the queue is secured:

 ```abnf
-send = %s"SEND " smpEncMessage
+send = %s"SEND " msgFlags SP smpEncMessage
+msgFlags = notificationFlag reserved
+notificationFlag = %s"T" / %s"F"
 smpEncMessage = smpPubHeader sentMsgBody ; message up to 16088 bytes
 smpPubHeader = smpClientVersion ("1" senderPublicDhKey / "0")
 smpClientVersion = word16
@@ -707,9 +746,11 @@ See its syntax in [Create queue command](#create-queue-command)
 The server must deliver messages to all subscribed simplex queues on the currently open transport connection. The syntax for the message delivery is:

 ```abnf
-message = %s"MSG " msgId SP timestamp SP encryptedMsgBody
+message = %s"MSG " msgId encryptedRcvMsgBody
 encryptedMsgBody = <encrypt paddedSentMsgBody> ; server-encrypted padded sent msgBody
 paddedSentMsgBody = <padded(sentMsgBody, maxMessageLength + 2)> ; maxMessageLength = 16088
+encryptedRcvMsgBody = <encrypt rcvMsgBody> ; server-encrypted meta-data and padded sent msgBody
+rcvMsgBody = timestamp msgFlags SP paddedSentMsgBody
 msgId = length 24*24OCTET
 timestamp = 8*8OCTET
 ```
@@ -735,10 +776,19 @@ See its syntax in [Enable notifications command](#enable-notifications-command)
 The server must deliver message notifications to all simplex queues that were subscribed with `subscribeNotifications` command ("NSUB") on the currently open transport connection. The syntax for the message notification delivery is:

 ```abnf
-messageNotification = %s"NMSG"
+messageNotification = %s"NMSG " nmsgNonce encryptedNMsgMeta
+
+encryptedNMsgMeta = <encrypted message metadata passed in notification>
+; metadata E2E encrypted between server and recipient containing server's message ID and timestamp (allows extension),
+; to be passed to the recipient by the notifier for them to decrypt
+; with key negotiated in NKEY and NID commands using nmsgNonce
+
+nmsgNonce = <nonce used in NaCl crypto_box encryption scheme>
+; nonce used by the server for encryption of message metadata, to be passed to the recipient by the notifier
+; for them to use in decryption of E2E encrypted metadata
 ```

-Message notification does not contain any message data or meta-data, it only notifies that the message is available.
+Message notification does not contain any message data or non E2E encrypted metadata.

 #### Subscription END notification

@@ -792,6 +842,7 @@ ok = %s"OK"
 Both the recipient and the sender can use TCP or some other, possibly higher level, transport protocol to communicate with the server. The default TCP port for SMP server is 5223.

 For scenarios when meta-data privacy is critical, it is recommended that clients:
+
 - communicating over Tor network,
 - establish a separate connection for each SMP queue,
 - send noise traffic (using PING command).
@@ -799,12 +850,14 @@ For scenarios when meta-data privacy is critical, it is recommended that clients
 In addition to that, the servers can be deployed as Tor onion services.

 The transport protocol should provide the following:
+
 - server authentication (by matching server certificate hash with `serverIdentity`),
 - forward secrecy (by encrypting the traffic using ephemeral keys agreed during transport handshake),
 - integrity (preventing data modification by the attacker without detection),
 - unique channel binding (`sessionIdentifier`) to include in the signed part of SMP transmissions.

 By default, the client and server communicate using [TLS 1.3 protocol][13] restricted to:
+
 - TLS_CHACHA20_POLY1305_SHA256 cipher suite (for better performance on mobile devices),
 - ed25519 and ed448 EdDSA algorithms for signatures,
 - x25519 and x448 ECDHE groups for key exchange.
@@ -0,0 +1,156 @@
+# SimpleX File Transfer protocol
+
+## Problem
+
+Sending files as currently implemented in SimpleX Chat is inefficient for these reasons:
+
+1. Slow: message delivery requires acknowledgement for each message before the server sends the next message.
+2. Not fully asynchronous:
+   a. SMP queue size is limited, so the whole file cannot be sent/stored in server memory.
+   b. Recipient needs to accept the file before it is sent.
+3. No broadcast: sending the same file to multiple recipients requires sending it multiple times.
+
+## Possible solutions
+
+These problems could be solved within SMP protocol:
+
+- streaming messages without waiting for acknowledgements.
+- bigger queue sizes stored on hard drive and accepting large files without waiting for the recipient confirmation.
+- adding broadcast to SMP servers.
+
+These solution are complex and they do not scale well.
+
+Another approach would be adopting some open-source file storage, possibly S3-compatible, to host files while "in transit". The downsides are:
+
+1. Missing features. S3-compatible file servers require a service layer that we would need to develop to manage user accounts and permissions. There are solutions that allow self-registering users and uploading files without service layer, but they are not flexible enough in managing policies for these files.
+2. Limited meta-data protection, both on the application and on transport layer: same address for sending and receiving a file, file size is known to the server, etc.
+3. More difficult to self-host for the users when the server has 2 components (a 3rd party solution with our service component).
+
+We are not considering P2P solutions because of their bad meta-data privacy and requirement of having a single network - the same reason why P2P design is not used for SimpleX messaging network.
+
+A proposed solution is to develop a file hosting service (SimpleX File Transfer service) that would have better meta-data protection and functionality than the alternatives, using the ideas from SMP protocol design.
+
+The parameters of the solution would be:
+
+1. The server does not have knowledge of the users and actual files – only anonymously uploaded fixed-size chunks (considered 8Mb, maybe we should allow 2 sizes, e.g. 1Mb and 8Mb).
+2. The server should allow broadcast, so that a chunk can be downloaded by multiple recipients.
+3. There should be no identifiers and ciphertext in common inside TLS between sender and recipient traffic, and between the traffic of different recipients of the same file. This approach can be extended to support public chunks that have persistent identifiers.
+4. The server should prevent multiple uploads of the same chunk. This can be extended to allow multiple downloads from the same persistent address.
+5. Clients can send the chunks from the same file via multiple servers, both by splitting chunks between them and for redundancy.
+
+## Design approach
+
+File transfer servers will be chosen by file senders. The servers will allow senders to anonymously upload fixed-size file chunks.
+
+### Transport protocol
+
+- binary-encoded commands sent as fixed-size padded block in the body of HTTP2 POST request, similar to SMP and notifications server protocol transmission encodings.
+- HTTP2 POST with a fixed size padded block body for file upload and download.
+
+Block size - 4096 bytes (it would fit ~120 Ed25519 recipient keys).
+
+The reasons to use HTTP2:
+
+- avoid the need to have two hostnames (or two different ports) for commands and file uploads.
+- compatibility with the existing HTTP2 client libraries.
+
+The reason not to use JSON bodies:
+
+- bigger request size, so fewer recipient keys would fit in a single request
+- signature over command has to be outside of JSON anyway.
+
+The reason not to use URI segments / HTTP verbs / REST semantics is to have consistent request size.
+
+### Required server commands:
+
+- File sender:
+  - create file chunk record.
+    - Parameters:
+      - Ed25519 key for subsequent sender commands and Ed25519 keys for commands of each recipient.
+      - chunk size.
+    - Response:
+      - chunk ID for the sender and different IDs for all recipients.
+  - add recipients to file chunk
+    - Parameters:
+      - sender's chunk ID
+      - Ed25519 keys for commands of each recipient.
+    - Response:
+      - chunk IDs for new recipients.
+  - upload file chunk.
+  - delete file chunk (invalidates all recipient IDs).
+- File recipient:
+  - download file chunk:
+    - chunk ID
+    - DH key for additional encryption of the chunk.
+    - command should be signed with the key passed by the sender when creating chunk record.
+  - delete file chunk ID (only for one recipient): signed with the same key.
+
+### Storage model
+
+Same as for SMP and notifications server - in-memory storage of the records, with adding to append-only log, restored and compacted on server restart.
+
+### Sending file
+
+To send the file, the sender will:
+
+- compute SHA512 digest
+- pad the file to match the whole number of chunks in size,
+- encrypt it with a randomly chosen symmetric key and IV (e.g., using NaCL cryptobox),
+- split into fixed size chunks
+- upload each chunk to a randomly chosen server.
+
+Then the sending client will combine addresses of all chunks and other information into "file description", different for each file recipient, that will include:
+
+- an encryption key that was used to encrypt the file (the same for all recipients).
+- file SHA512 digest
+- list of chunk descriptions; information for each chunk:
+  - private Ed25519 key to sign commands for file transfer server.
+  - chunk address (server host and chunk ID).
+
+To reduce the size, chunk descriptions will be grouped by the server host.
+
+This "file description" itself will be sent as a small file. To estimate its size:
+
+- each chunk \* redundancy per chunk, assuming chunks are grouped per server:
+  - chunk number in the file - 8 bytes (including any overhead)
+  - Ed25519 key (different for each recipient / chunk combination) - 32 bytes \* 4/3 (base64, assuming text encoding)
+  - chunk ID (different for each recipient) - 64 bytes \* 4/3
+- server addresses - say, 128 bytes per server
+- sha512 digest - 64 bytes \* 4/3
+- encryption key - 32 bytes \* 4/3
+- IV - 32 bytes \* 4/3
+- encoding overhead - say, 256 bytes
+
+For 1gb file, sent via 4 different servers, in 8Mb chunks, with redundancy 2, the size of "file description", assuming text encoding, will be ~34kb (`128 * (8 + 32 + 64) * 2 * 4/3 + 128 * 4 + (64 + 32 + 32) * 4/3 + 256`).
+
+File description format (yml):
+
+```
+name: file.ext
+size: 33200000
+chunk: 8Mb
+hash: abc=
+key: abc=
+iv: abc=
+parts:
+  - server: xftp://abc=@example1.com
+    chunks: [1:abc=:def=, 3:abc=:def=]
+  - server: xftp://abc=@example2.com
+    chunks: [2:abc=:def=, 4:abc=:def=]
+  - server: xftp://abc=@example3.com
+    chunks: [1:abc=:def=, 4:abc=:def=]
+  - server: xftp://abc=@example4.com
+    chunks: [2:abc=:def=, 3:abc=:def=]
+```
+
+This file description is sent to all recipients via normal messages, split to 15780 byte chunks if needed.
+
+### Receiving file
+
+Having received the description, the recipient will:
+
+- download all chunks falling back to secondary servers, if needed
+- combine the chunks into a file
+- decrypt the file
+- un-pad it
+- validate file digest
@@ -0,0 +1,20 @@
+# SMP and SMP agent protocol extensions to manage queue quotas
+
+## Problem
+
+SMP servers define a limit on the number of messages that can be stored on the server. When the sender reaches this limit, they continue trying to send the message with exponential back off, until the server allows it. To reduce the traffic we added expiration on unsent messages of 2 days that:
+
+- adds its own set of problems because of expired control messages - e.g., group fragmentation.
+- doesn't solve problem of traffic in active groups with many inactive members - there are still too many retries in queues that reached capacity.
+
+## Solution
+
+Sending agent permanently stops trying to send messages having received `ERR QUOTA` (or, for the period of clients migration, increases TTL much more than in cases of network errors).
+
+Add SMP server event that means "quota reached" (e.g. `QTA` or `MSG QUOTA`) - it will be delivered to the recipient once all messages are retrieved at the same point in message stream where the sender received `ERR QUOTA`. Alternatively, it could be a message flag that is set on the last message in the queue at a point the sender received `ERR QUOTA`.
+
+Add SMP agent message that means "quota available, resume sending" (e.g. `A_QTA` or `A_RESUME`) – the receiving agent will send it via the reply queue to the sending agent that will resume sending messages at this point.
+
+Possibly, increase TTL for local messages to 30 days. That might require separately addressing the problem of permanently failing servers.
+
+We discussed a possible solution of merging all messages to one server into one delivery queue, so that having multiple failing queues on this server will not result in multiple connection attempts, and this proposal also answers the question what to do with the messages when quota is exceeded - the whole queue can be marked as suspended, and processed separately from others - TBD.
@@ -0,0 +1,34 @@
+# SMP protocol changes to support push notifications on iOS
+
+## Problem
+
+There are already commands/responses to allow subscriptions to message notifications - NKEY/NID, NSUB/NMSG. These commands will be used by SMP agent (NKEY/NID) and by notification server (NSUB/NMSG) to have message notifications delivered to notification server, so it can forward them to APNS server using device token.
+
+There are two remaining problems that these commands do not solve.
+
+1. Receiving the message when notification arrives.
+
+iOS requires creating a bundled notification service extension (NSE) that runs in isolated container and, if we were to use the existing commands, would have SMP subscription to the same SMP servers as the main app, triggering resubscriptions every time the message reception switches between the app and NSE. That would cause a substantial increase in traffic and battery consumption to the users.
+
+2. Showing notifications for service messages.
+
+Users do not expect to see notifications for every single SMP messages - e.g., we currently do not show notifications when messages are edited and deleted, and users do not expect them. NSE requires that for every received push notification there should be some notification shown to the users. So only we would have to show a notification for message deletes and updates, we would have to show it for all service messages - e.g. user accepted file invitation, or file transmission has started, contact profile updates and so on.
+
+We considered differentiating whether notifications are sent per queue, from the recipient side, so we do not send notifications for file queues. But it seems insufficient, particularly if we add such features as message receipts, status updates, etc.
+
+## Proposal
+
+1. To retrieve messages when push notifications arrive, we will add 2 SMP commands:
+
+- GET: retrieve one message from the connection. Resonse could be either MSG (the same as when MSG is delivered, but with the correlation id) or GMSG (to simplify processing) – TBC during implementation. If message is not available, the response could be ERR NO_MSG
+- ACK or GACK: acknowledge that the message was processed by the client and can be removed - TBC which one is better. The response is OK or ERR NO_MSG if there was nothing to acknowledge (same as with ACK now)
+
+This would allow receiving a single message from the queue without subscription, this way avoiding that the main app is unsubscribed from the queue.
+
+2. The only way to avoid showing unnecessary notifications (status updates, service messages, etc.) is to avoid sending them. That requires instructing SMP server whether notification should be sent both per queue, from the recipient side, and per message - from the sender side. So the notification would only be sent if the queue has them enabled (via NKEY command) and the sender includes an additional flag in SEND command. The same flag should be included into MSG, so when the message is retrieved with GET command, the client knows, on the agent or chat level (or both), whether this message should have notification shown to the user, and if not - retrieve the next one(s) as well.
+
+This is a substantial change to SMP protocol, that would require client and server upgrade for notifications to be supported.
+
+We should consider whether to increase the SMP protocol version number to 2, so that the new clients can connect to the old clients but without notifications, or we could keep the old commands in the protocol and instead of adding flags to the existing commands, create new commands.
+
+We can also consider making commands extensible so that the new flags can be added (and ignored by parsers if not supported) to at least some existing commands.
@@ -0,0 +1,75 @@
+# DB access and processing messages for iOS notification service extension
+
+## Problem
+
+The only way to receive/process notificaitons is via a separate NSE process that requires a concurrent DB and network access.
+
+SQLite concurenncy does not work, so we need to sync database access.
+
+The problem is complex, as we do not directly control db access from the app, it can be triggered by the message arriving and it may fail to complete in case the app is suspended in the background.
+
+So we need to prevent db access from starting when we know the app is about to be suspended.
+
+The last problem is how to receive and process messages in NSE - should it use recently added GET command or should it subscribe to the connections that receive messages and process messages normally.
+
+To summarize, 2 problems need to be solved:
+
+1. sync db access between 2 (or more, if we add share extension) processes
+
+2. prevent access from starting when the process is due to suspend, only complete operations.
+
+3. Receiveing and processing agent messages in NSE
+
+## Proposed solution
+
+For problem 1, we can use Posix semaphores from our core code, in the same bracket that manages database connection - it would wait for semaphore to be free and unlock it once the db operation is complete.
+
+For problem 2, we need to communicate from the app when it goes to the background to prevent database access starting and completing before the suspension. This would set some `aboutToSuspend` STM flag (or the opposite) that would prevent operations from progressing (using STM retry, that would block until the flag has the value allowing operation to progress).
+
+Several possibilities can be considered:
+
+- use this flag in the bracket that provides DB connections. While simple, it may lock some operations in the middle and may also lead to the situation when network operation succeeds but database access was blocked, and the database is not updated.
+- use this flag to stop network operations that would require database updates - like sending messages, subscriptions and ACK - all these operations would require database access once they succeed.
+- use two flags, for both cases above, but set them at different times since going to background - block new network operations as soon as the app goes to the background and block database access once the app is about to be suspended.
+
+The last option seems more robust. To do it, there will be an api allowing the app to communicat its phase:
+
+- app going to the background would trigger blocking new network operations and start a new background task - `background` phase.
+- background task receiving completion warning, or, maybe, some time after it is started - probably 20 seconds - or whatever happens earlier - would trigger call blocking db access - `suspended` phase.
+- app becoming active would trigger unblocking both flags - `active` phase.
+
+`/_app phase <phase>` where `phase` can be one of the above values.
+
+NSE would also use the same phases:
+
+- sending `active` when it is started (the process starts as active, but it is possible that the new notification arrives to the same process, after the previous one sent background/suspension)
+- sending `background + suspended` (or `suspended` should set both flags) once it is finished processing the notification, provided no new notification arrived and started processing - this should be tracked in NSE.
+
+For problem 3, NSE can do one of the following:
+
+- use SUB and process messages normally - the downside is that the app will have to resubscribe and it has to be tracked.
+- use GET and process messages by pushing them through the processing function - the downside it that a rewiring of message processing is needed.
+- use GET but deliver messages through the same queue as when they arrive normally (in which case getMessage agent function should not return the message, but will return a flag showing whether the message was received, or, possibly, or, possibly will return a message but the message would also be sent to the queue?).
+- process messages in agent manually and in chat via the queue.
+
+One of the downside of GET is that it requires calling GET again after ACK. We could have two variants of ACK (or additional ACK parameter) - one that never delivers a new message, and another one that does. In this case, if get needs to process the next message (when the current one has no notification flag), it can call ACK that delivers the next message. But, it is probably a premature optimization, and having general support of batched commands would add more value.
+
+Additional problem is concurrency in NSE - if the new notification from the same queue arrives before the current one finishes processing in the same process one of the following can happen:
+
+- the 2nd notification naively call GET and receives the same message.
+- the 2nd notification waits until the first finished processing, in which case it can run out of time.
+
+The problem is that the app won't know it's the same queue, as nId is encrypted, so the agent should handle this scenario when the new call to getMessage is made before the previous one finished processing, and differentiate between calls made for additional messages (possibly, getMessage should include previous message ID, if it is available) and the first call.
+
+EDIT: GETs have to be sent from UI to chat and from chat to agent as function calls, but the agent will have to queue get calls to make sure they return different messages. GET call would return message flags (incl. notification flag), so that the UI can send the next GET if needed without waiting.
+
+Considered alternative: include notification content in the message and have NSE only perform decryption, without any network IO. In this case notification content would be in SEND and in NMSG, e2e encrypted.
+
+While promising, as it solves network coordination issues and makes GET unnecessary, it creates mutliple other problems, so it was rejected:
+
+- message content is exposed to centralized ntf and apns servers, creating additional attack vector.
+- it adds complexity in security critical parts of the stack - double ratchet encryption, as it requires either storing message keys and using different IVs for notifications, or initializing completely separate ratchet for notifications content.
+- it reduces the size of the message.
+- it makes user experience worse, as:
+  - it would not accelerate handshake for new contacts and for file delivery - this approach only works for content messages.
+  - it would open the app without the new messages - the users would have to wait until the messages are received. It is also bad for "security optics" - the users might think that the message content was exposed to notifications.
@@ -0,0 +1,61 @@
+sequenceDiagram
+  participant M as iOS message<br>notification
+  participant S as iOS system
+  participant N as iOS NSE
+  participant U as iOS UI
+  participant C as Core chat
+  participant A as Core agent
+
+  M ->> N: notification
+  S ->> N: get app pref
+  note over N: ignore,<br>app is active
+
+  note over M, A: app going to background
+  S ->> U: phase: background<br>(possibly, "will" method)
+  U ->> S: set app pref "pausing"
+  U ->> C: /_app phase paused, result CRCmdOk
+  C ->> A: pauseAgent<br>(no new network IO)
+  M ->> N: notification
+  S ->> N: get app pref
+  note over N: wait/poll for<br>"paused"/"suspending"/"suspended"<br>event/pref
+  A ->> C: event "IO paused"<br>(after in-flight op completed)<br>PHASE PAUSED
+  C ->> U: event "IO paused" (CRAppPaused)
+  U ->> S: set shared pref "paused"
+
+  note over M, A: process notification
+  M ->> N: notification
+  S ->> N: get app pref<br>continue if<br>"paused"/"suspending"/"suspended"
+  N ->> S: set NSE pref "active"
+  N ->> C: /_get message
+  C ->> A: getMessage
+  A ->> C: msg flags
+  C ->> N: msg flags
+  note over N: get messages<br>until notification flag set
+  A ->> C: MSG/CONF/INFO
+  C ->> N: some event
+  N ->> S: set NSE pref "completed"
+  N ->> S: show notification
+
+  note over M, A: app about to be suspended<br>(or 15-20 sec after background)
+  S ->> U: background task notice
+  U ->> S: set app pref "suspending"
+  U ->> C: /_app phase suspended, response ok
+  C ->> A: suspendAgent<br>(no new DB)
+  A ->> C: event "DB paused"<br>(after in-flight op completed)<br>PHASE SUSPENDED
+  C ->> U: event "DB paused" (CRAppSuspended)
+  U ->> S: set app pref "suspended"
+
+  note over M, A: app about to be activated
+  S ->> U: phase: active<br>(or inactive?)<br><br>(possibly, "will" method)
+  S ->> U: get NSE pref
+  U ->> S: set app pref "activating"
+  alt nse active?
+    U ->> C: /_app phase inactive
+    note over U: poll/wait till NSE pref is "completed"
+  end
+
+  U ->> C: /_app phase active (response result)
+  C ->> A: activateAgent<br>(allow IO/DB)
+  A ->> C: result ()
+  C ->> U: CRCmdOk
+  U ->> S: set app pref "active"
@@ -0,0 +1,26 @@
+# Accessing SMP servers via Tor
+
+## Problem
+
+While SMP protocol is focussed on minimizing application-level meta-data by using pair-wise identifiers instead of user profile identifiers, it is important for many users to protect their IP addresses.
+
+Further, even if IP addresses are hidden by onion routing, clients should be able to choose to use a separate TCP connection to subscribe to each queue, even though it increases traffic and battery consumption, as otherwise the servers can observe multiple queues accessed by the same client.
+
+## Solution and requirements
+
+While some users may want to access SMP servers via tor, some other users (even their contacts) may want the opposite - e.g., if they use the network when accessing Tor would be suspicious (or blocked).
+
+Therefore we need to support the connections when one of the user accesses the same server via Tor (and, possibly, via onion address), while another user accesses this server without Tor.
+
+At the same time the user accessing the server via Tor may not want that their contacts access this server without Tor, and it also may be possible that the server is not available under a normal (not .onion) address.
+
+The proposed options for connecting via Tor are:
+
+1. Access servers via Socks proxy: no/yes (specify port?)
+2. Use .onion addresses: no/when available/warn/always
+3. Require senders to use .onion addresses: yes/no
+4. Use separate TCP connection for each queue
+
+While it should be possible for SMP servers to have two addresses (with and without Tor), the queues should only use one server address - if the queue started being accessed via .onion address it should not be possible to access it via a normal address. Queue addresses in connection invitations should support dual server addresses (when senders are not required ot use .onion address).
+
+At the same time, the queue with the normal addresses can be accessed with and without Tor, depending on the current device settings.
@@ -0,0 +1,53 @@
+# SMP queue rotation and redundancy
+
+## Problem
+
+1. Long term usage of the queue allows the servers to analyze long term traffic patterns.
+
+2. If the user changes the configured SMP server(s), the previously created contacts do not migrate to the new server(s).
+
+3. Server can lose messages.
+
+## Solution
+
+Additional messages exchanged by SMP agents to negotiate addition and removal of queues to the connection.
+
+This approach allows for both rotation and redundancy, as changing queue will be done be adding a queue and then removing the existing queue.
+
+The reason for this approach is that otherwise it's non-trivial to switch from one queue to another without losing messages or delivering them out of order, it's easier to have messages delivered via both queues during the switch, however short or long time it is.
+
+### Messages
+
+Additional agent messages required for the protocol:
+
+    QADD_ -> "QA"
+    QKEY_ -> "QK"
+    QUSE_ -> "QU"
+    QTEST_ -> "QT"
+
+`QADD`: add the new queue address(es), the same format as `REPLY` message, encoded as `QA`.
+
+`QKEY`: pass sender's key via existing connection (SMP confirmation message will not be used, to avoid the same "race" of the initial key exchange that would create the risk of intercepting the queue for the attacker), encoded as `QK`.
+
+`QUSE`: instruct the sender to use the new queue with sender's queue ID as parameter, encoded as `QU`.
+
+`QTEST`: send test message to the new connection, encoded as `QT`. Any other message can be sent if available to continue rotation, the absence of this message is not an error. Once this message is successfully sent the sender will stop using the old queue. Once this message (or any other message in the new queue) is received, the recipient will stop using the old queue and delete it.
+
+### Protocol
+
+```
+participant A as Alice
+participant B as Bob
+participant R as Server that has A's receive queue
+participant S as Server that has A's send queue (B's receive queue)
+participant R' as Server that hosts the new A's receive queue
+
+A ->> R': create new queue
+A ->> S ->> B: QADD (R'): snd address of the new queue(s)
+B ->> S(R) ->> A: QKEY (R'): sender's key for the new queue(s) (to avoid the race of SMP confirmation for the initial exchange)
+A ->> S(R'): secure new queue
+A ->> S ->> B: QUSE (R'): instruction to use new queue(s)
+B ->> S(R') ->> A: QTEST
+A ->> S(R): DEL: delete the old queue
+B ->> S(R') ->> A: send all new messages to the new queue
+```
@@ -0,0 +1,27 @@
+# SMP Basic Auth
+
+## Problem
+
+Users who host their own servers do not want unknown people to be able to create messaging queues on their servers after discovering server address in groups or after making a connection. As the number of self-hosted servers is growing it became more important than it was when we excluded it from the original design.
+
+## Solution
+
+Single access password that can be optionally included in server address that is passed to app configuration. It will not be allowed in the existing contexts (and parsing will fail), to avoid accidentally leaking it. Server address with password will look this way: `smp://fingerprint:password@hosts`
+
+## Implementation plan
+
+1. A separate type to include server and password, so it can only be used where allowed.
+
+2. Server password to create queues will be configured in TRANSPORT section of INI file, as `create_password` parameter.
+
+3. The password will only be required in server configuration/address to create queues only, it won't be required for other receiving queue operations on already existing queues.
+
+4. If new command is attempted in the session that does not allow creating queues, the server will send `ERR AUTH` response
+
+5. Passing password to the server can be done in one of the several ways, we need to decide:
+
+  - as a parameter of NEW command. Pros: a local change, that only needs checking when queue is created. Cons: protocol version change.
+  - as a separate command AUTH. Pros: allows to include additional parameters and potentially be extended beyond basic auth. Cons: more complex to manage server state, can be more difficult syntax in the future, if extended.
+  - as part of handshake (we currently ignore the unparsed part of handshake block, so it can be extended). Pros: probably, the simplest, and independent of the commands protocol – establishes create permission for the current session. Cons: the client won't know about whether it is able to create the queue until it tries (same as in case 1).
+
+  My preference is the last option. As a variant of the last option, we can add a server response/message that includes permission to create queues - it will only be sent to the clients who pass credential in handshake - that might simplify testing server connection (we currently do not do it). It might be unnecessary, as we could simply create and delete queue in case credential is passed as part of testing connection (and even sending a message to it).
@@ -0,0 +1,29 @@
+#!/usr/bin/env sh
+confd="/etc/opt/simplex"
+logd="/var/opt/simplex/"
+
+# Check if server has been initialized
+if [ ! -f "$confd/smp-server.ini" ]; then
+  # If not, determine ip or domain
+  case $addr in
+    '') printf "Please specify \$addr environment variable.\n"; exit 1 ;;
+    *[a-zA-Z]*) set -- -n $addr ;;
+    *) set -- --ip $addr ;;
+  esac
+
+  case $pass in
+    '') set -- "$@" --no-password ;;
+    *) set -- "$@" --password $pass ;;
+  esac
+
+  smp-server init -y -l "$@"
+fi
+
+# backup store log
+[ -f "$logd/smp-server-store.log" ] && cp "$logd"/smp-server-store.log "$logd"/smp-server-store.log.bak
+# rotate server log
+[ -f "$logd/smp-server.log" ] && mv "$logd"/smp-server.log "$logd"/smp-server-"$(date +'%FT%T')".log
+
+# Finally, run smp-sever. Notice that "exec" here is important:
+# smp-server replaces our helper script, so that it can catch INT signal
+exec smp-server start > "$logd"/smp-server.log 2>&1
@@ -0,0 +1,178 @@
+#!/bin/bash
+
+# <UDF name="enable_store_log" label="Store log - persist notification subscriptions to append only log and restore them upon server restart." default="on" oneof="on, off" />
+# <UDF name="api_token" label="Linode API token - enable Linode to create tags with server address, fingerprint and version. Note: minimal permissions token should have are read/write access to `linodes` (to create tags) and `domains` (to add A record for the third level domain if FQDN is provided)." default="" />
+# <UDF name="fqdn" label="FQDN (Fully Qualified Domain Name) - provide third level domain name (e.g. ntf.example.com). If provided use `ntf://fingerprint@FQDN` as server address in the client. If FQDN is not provided use `ntf://fingerprint@IP` instead." default="" />
+# <UDF name="apns_key_id" label="APNS key ID." default="" />
+
+# Log all stdout output to stackscript.log
+exec &> >(tee -i /var/log/stackscript.log)
+
+# Uncomment next line to enable debugging features
+# set -xeo pipefail
+
+cd $HOME
+
+# https://superuser.com/questions/1638779/automatic-yess-to-linux-update-upgrade
+# https://superuser.com/questions/1412054/non-interactive-apt-upgrade
+sudo DEBIAN_FRONTEND=noninteractive \
+  apt-get \
+  -o Dpkg::Options::=--force-confold \
+  -o Dpkg::Options::=--force-confdef \
+  -y --allow-downgrades --allow-remove-essential --allow-change-held-packages \
+  update
+
+sudo DEBIAN_FRONTEND=noninteractive \
+  apt-get \
+  -o Dpkg::Options::=--force-confold \
+  -o Dpkg::Options::=--force-confdef \
+  -y --allow-downgrades --allow-remove-essential --allow-change-held-packages \
+  dist-upgrade
+
+# TODO install unattended-upgrades
+sudo DEBIAN_FRONTEND=noninteractive \
+  apt-get \
+  -o Dpkg::Options::=--force-confold \
+  -o Dpkg::Options::=--force-confdef \
+  -y --allow-downgrades --allow-remove-essential --allow-change-held-packages \
+  install jq
+
+# Add firewall
+echo "y" | ufw enable
+
+# Open ports
+ufw allow ssh
+ufw allow https
+ufw allow 5223
+
+# Increase file descriptors limit
+echo 'fs.file-max = 1000000' >> /etc/sysctl.conf
+echo 'fs.inode-max = 1000000' >> /etc/sysctl.conf
+echo 'root soft nofile unlimited' >> /etc/security/limits.conf
+echo 'root hard nofile unlimited' >> /etc/security/limits.conf
+
+# Download latest release
+bin_dir="/opt/simplex-notifications/bin"
+binary="$bin_dir/ntf-server"
+mkdir -p $bin_dir
+curl -L -o $binary https://github.com/simplex-chat/simplexmq/releases/latest/download/ntf-server-ubuntu-20_04-x86-64
+chmod +x $binary
+
+# / Add to PATH
+cat > /etc/profile.d/simplex.sh << EOF
+#!/bin/bash
+
+export PATH="$PATH:$bin_dir"
+
+EOF
+# Add to PATH /
+
+# Source and test PATH
+source /etc/profile.d/simplex.sh
+ntf-server --version
+
+# Initialize server
+init_opts=()
+
+[[ $ENABLE_STORE_LOG == "on" ]] && init_opts+=(-l)
+
+ip_address=$(curl ifconfig.me)
+init_opts+=(--ip $ip_address)
+
+[[ -n "$FQDN" ]] && init_opts+=(-n $FQDN)
+
+ntf-server init "${init_opts[@]}"
+
+# Server fingerprint
+fingerprint=$(cat /etc/opt/simplex-notifications/fingerprint)
+
+# Determine server address to specify in welcome script and Linode tag
+if [[ -n "$FQDN" ]]; then
+  server_address=$FQDN
+else
+  server_address=$ip_address
+fi
+
+# Set up welcome script
+on_login_script="/opt/simplex-notifications/on_login.sh"
+
+# / Welcome script
+cat > $on_login_script << EOF
+#!/bin/bash
+
+fingerprint=\$1
+server_address=\$2
+
+cat << EOF2
+********************************************************************************
+
+SimpleX notifications server address: ntf://\$fingerprint@\$server_address
+Check server status with: systemctl status ntf-server
+
+To keep this server secure, the UFW firewall is enabled.
+All ports are BLOCKED except 22 (SSH), 443 (HTTPS), 5223 (notifications server).
+
+********************************************************************************
+To stop seeing this message delete line - bash /opt/simplex-notifications/on_login.sh - from /root/.bashrc
+EOF2
+
+EOF
+# Welcome script /
+
+chmod +x $on_login_script
+echo "bash $on_login_script $fingerprint $server_address" >> /root/.bashrc
+
+# Create A record and update Linode's tags
+if [[ -n "$API_TOKEN" ]]; then
+  if [[ -n "$FQDN" ]]; then
+    domain_address=$(echo $FQDN | rev | cut -d "." -f 1,2 | rev)
+    domain_id=$(curl -H "Authorization: Bearer $API_TOKEN" https://api.linode.com/v4/domains \
+    | jq --arg da "$domain_address" '.data[] | select( .domain == $da ) | .id')
+    if [[ -n $domain_id ]]; then
+      curl \
+        -s -H "Content-Type: application/json" \
+        -H "Authorization: Bearer $API_TOKEN" \
+        -X POST -d "{\"type\":\"A\",\"name\":\"$FQDN\",\"target\":\"$ip_address\"}" \
+        https://api.linode.com/v4/domains/${domain_id}/records
+    fi
+  fi
+
+  version=$(ntf-server --version | cut -d ' ' -f 3-)
+
+  curl \
+    -s -H "Content-Type: application/json" \
+    -H "Authorization: Bearer $API_TOKEN" \
+    -X PUT -d "{\"tags\":[\"$server_address\",\"$fingerprint\",\"$version\"]}" \
+    https://api.linode.com/v4/linode/instances/$LINODE_ID
+fi
+
+# / Create systemd service
+cat > /etc/systemd/system/ntf-server.service << EOF
+[Unit]
+Description=SimpleX notifications server
+
+[Service]
+Environment="APNS_KEY_FILE=/etc/opt/simplex-notifications/AuthKey.p8"
+Environment="APNS_KEY_ID=$APNS_KEY_ID"
+Type=simple
+ExecStart=/bin/sh -c "exec $binary start >> /var/opt/simplex-notifications/ntf-server.log 2>&1"
+KillSignal=SIGINT
+Restart=always
+RestartSec=10
+LimitNOFILE=1000000
+LimitNOFILESoft=1000000
+
+[Install]
+WantedBy=multi-user.target
+
+EOF
+# Create systemd service /
+
+# Start systemd service
+chmod 644 /etc/systemd/system/ntf-server.service
+sudo systemctl enable ntf-server
+# ! APNS key file and certificate have to be copied manually
+# sudo systemctl start ntf-server
+
+# Reboot Linode to apply upgrades
+# sudo reboot
@@ -86,10 +86,6 @@ smp-server init "${init_opts[@]}"
 fingerprint=$(cat /etc/opt/simplex/fingerprint)

 # Determine server address to specify in welcome script and Linode tag
-# ! If FQDN was provided and used as part of server initialization, server's certificate will not pass validation at client
-# ! if client tries to connect by server's IP address, so we have to specify FQDN as server address in Linode tag and
-# ! in welcome script regardless of creation of A record in Linode
-# ! https://hackage.haskell.org/package/x509-validation-1.6.10/docs/src/Data-X509-Validation.html#validateCertificateName
 if [[ -n "$FQDN" ]]; then
  server_address=$FQDN
 else
@@ -157,6 +153,8 @@ Description=SMP server
 [Service]
 Type=simple
 ExecStart=/bin/sh -c "exec $binary start >> /var/opt/simplex/smp-server.log 2>&1"
+KillSignal=SIGINT
+TimeoutStopSec=infinity
 Restart=always
 RestartSec=10
 LimitNOFILE=1000000
@@ -0,0 +1,37 @@
+1. Install `tor` following [official guide](https://community.torproject.org/onion-services/setup/install/).
+
+2. Modify `/etc/tor/torrc` configuration file:
+
+```sh
+...
+# Disable anonymous mode for better connectivity
+## Needed for HiddenServiceNonAnonymousMode
+SOCKSPort 0
+## Needed for HiddenServiceSingleHopMode
+HiddenServiceNonAnonymousMode 1
+## Flag to disable anonymous mode
+## This option reduces the latency of server connection, but it makes server itself not anonymous,
+## it only protects the anonymity of the users connecting to the server.
+## In case your server address has both public and onion hostnames it is not anonymous anyway,
+## so this is what you want.
+HiddenServiceSingleHopMode 1
+
+# Specify folder for smp-tor
+## Folder for keys, address, etc.
+HiddenServiceDir /var/lib/tor/simplex-smp/
+## Map smp port (5223) to tor
+HiddenServicePort 5223 localhost:5223
+...
+```
+
+3. Restart `tor` system service:
+
+```
+sudo systemctl restart tor
+```
+
+4. Onion address can be obtained from following file:
+
+```sh
+sudo cat /var/lib/tor/simplex-smp/hostname
+```
@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# systemd has to be configured to use SIGINT to save and restore undelivered messages after restart.
+# Add this to [Service] section:
+# KillSignal=SIGINT
+curl -L -o /opt/simplex/bin/smp-server-new https://github.com/simplex-chat/simplexmq/releases/latest/download/smp-server-ubuntu-20_04-x86-64
+systemctl stop smp-server
+cp /var/opt/simplex/smp-server-store.log /var/opt/simplex/smp-server-store.log.bak
+mv /opt/simplex/bin/smp-server /opt/simplex/bin/smp-server-old
+mv /opt/simplex/bin/smp-server-new /opt/simplex/bin/smp-server
+chmod +x /opt/simplex/bin/smp-server
+systemctl start smp-server
@@ -1,11 +1,11 @@
 cabal-version: 1.12

-- This file has been generated from package.yaml by hpack version 0.34.4.
+-- This file has been generated from package.yaml by hpack version 0.35.0.
 --
 -- see: https://github.com/sol/hpack

 name:           simplexmq
-version:        2.1.1
+version:        4.2.2
 synopsis:       SimpleXMQ message broker
 description:    This package includes <./docs/Simplex-Messaging-Server.html server>,
                <./docs/Simplex-Messaging-Client.html client> and
@@ -37,6 +37,8 @@ library
      Simplex.Messaging.Agent
      Simplex.Messaging.Agent.Client
      Simplex.Messaging.Agent.Env.SQLite
+      Simplex.Messaging.Agent.Lock
+      Simplex.Messaging.Agent.NtfSubSupervisor
      Simplex.Messaging.Agent.Protocol
      Simplex.Messaging.Agent.QueryString
      Simplex.Messaging.Agent.RetryInterval
@@ -47,7 +49,13 @@ library
      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220101_initial
      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220301_snd_queue_keys
      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220322_notifications
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220404_ntf_subscriptions_draft
+      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220608_v2
+      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220625_v2_ntf_mode
+      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220811_onion_hosts
+      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220817_connection_ntfs
+      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220905_commands
+      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220915_connection_queues
+      Simplex.Messaging.Agent.TRcvQueues
      Simplex.Messaging.Client
      Simplex.Messaging.Client.Agent
      Simplex.Messaging.Crypto
@@ -58,19 +66,25 @@ library
      Simplex.Messaging.Notifications.Protocol
      Simplex.Messaging.Notifications.Server
      Simplex.Messaging.Notifications.Server.Env
+      Simplex.Messaging.Notifications.Server.Main
      Simplex.Messaging.Notifications.Server.Push.APNS
+      Simplex.Messaging.Notifications.Server.Stats
      Simplex.Messaging.Notifications.Server.Store
+      Simplex.Messaging.Notifications.Server.StoreLog
      Simplex.Messaging.Notifications.Transport
+      Simplex.Messaging.Notifications.Types
      Simplex.Messaging.Parsers
      Simplex.Messaging.Protocol
      Simplex.Messaging.Server
      Simplex.Messaging.Server.CLI
      Simplex.Messaging.Server.Env.STM
      Simplex.Messaging.Server.Expiration
+      Simplex.Messaging.Server.Main
      Simplex.Messaging.Server.MsgStore
      Simplex.Messaging.Server.MsgStore.STM
      Simplex.Messaging.Server.QueueStore
      Simplex.Messaging.Server.QueueStore.STM
+      Simplex.Messaging.Server.Stats
      Simplex.Messaging.Server.StoreLog
      Simplex.Messaging.TMap
      Simplex.Messaging.Transport
@@ -96,7 +110,7 @@ library
    , asn1-types ==0.3.*
    , async ==2.2.*
    , attoparsec ==0.14.*
-    , base >=4.7 && <5
+    , base >=4.14 && <5
    , base64-bytestring >=1.0 && <1.3
    , bytestring ==0.10.*
    , case-insensitive ==1.2.*
@@ -106,29 +120,31 @@ library
    , cryptonite >=0.27 && <0.30
    , cryptostore ==0.2.*
    , data-default ==0.7.*
-    , direct-sqlite ==2.3.*
+    , direct-sqlcipher ==2.3.*
    , directory ==1.3.*
    , filepath ==1.4.*
    , generic-random >=1.3 && <1.5
    , http-types ==0.12.*
    , http2 ==3.0.*
-    , ini ==0.4.*
+    , ini ==0.4.1
    , iso8601-time ==0.1.*
    , memory ==0.15.*
    , mtl ==2.2.*
-    , network ==3.1.2.*
-    , network-transport ==0.5.*
+    , network >=3.1.2.7 && <3.2
+    , network-transport ==0.5.4
    , optparse-applicative >=0.15 && <0.17
    , process ==1.6.*
    , random >=1.1 && <1.3
    , simple-logger ==0.1.*
-    , sqlite-simple ==0.4.*
+    , socks ==0.6.*
+    , sqlcipher-simple ==0.4.*
    , stm ==2.5.*
    , template-haskell ==2.16.*
    , text ==1.2.*
    , time ==1.9.*
+    , time-compat ==1.9.*
    , time-manager ==0.0.*
-    , tls >=1.5.7 && <1.6
+    , tls >=1.6.0 && <1.7
    , transformers ==0.5.*
    , unliftio ==0.2.*
    , unliftio-core ==0.2.*
@@ -136,9 +152,9 @@ library
    , x509 ==1.7.*
    , x509-store ==1.6.*
    , x509-validation ==1.6.*
+  default-language: Haskell2010
  if flag(swift)
    cpp-options: -DswiftJSON
-  default-language: Haskell2010

 executable ntf-server
  main-is: Main.hs
@@ -155,7 +171,7 @@ executable ntf-server
    , asn1-types ==0.3.*
    , async ==2.2.*
    , attoparsec ==0.14.*
-    , base >=4.7 && <5
+    , base >=4.14 && <5
    , base64-bytestring >=1.0 && <1.3
    , bytestring ==0.10.*
    , case-insensitive ==1.2.*
@@ -165,30 +181,32 @@ executable ntf-server
    , cryptonite >=0.27 && <0.30
    , cryptostore ==0.2.*
    , data-default ==0.7.*
-    , direct-sqlite ==2.3.*
+    , direct-sqlcipher ==2.3.*
    , directory ==1.3.*
    , filepath ==1.4.*
    , generic-random >=1.3 && <1.5
    , http-types ==0.12.*
    , http2 ==3.0.*
-    , ini ==0.4.*
+    , ini ==0.4.1
    , iso8601-time ==0.1.*
    , memory ==0.15.*
    , mtl ==2.2.*
-    , network ==3.1.2.*
-    , network-transport ==0.5.*
+    , network >=3.1.2.7 && <3.2
+    , network-transport ==0.5.4
    , optparse-applicative >=0.15 && <0.17
    , process ==1.6.*
    , random >=1.1 && <1.3
    , simple-logger ==0.1.*
    , simplexmq
-    , sqlite-simple ==0.4.*
+    , socks ==0.6.*
+    , sqlcipher-simple ==0.4.*
    , stm ==2.5.*
    , template-haskell ==2.16.*
    , text ==1.2.*
    , time ==1.9.*
+    , time-compat ==1.9.*
    , time-manager ==0.0.*
-    , tls >=1.5.7 && <1.6
+    , tls >=1.6.0 && <1.7
    , transformers ==0.5.*
    , unliftio ==0.2.*
    , unliftio-core ==0.2.*
@@ -196,9 +214,9 @@ executable ntf-server
    , x509 ==1.7.*
    , x509-store ==1.6.*
    , x509-validation ==1.6.*
+  default-language: Haskell2010
  if flag(swift)
    cpp-options: -DswiftJSON
-  default-language: Haskell2010

 executable smp-agent
  main-is: Main.hs
@@ -215,7 +233,7 @@ executable smp-agent
    , asn1-types ==0.3.*
    , async ==2.2.*
    , attoparsec ==0.14.*
-    , base >=4.7 && <5
+    , base >=4.14 && <5
    , base64-bytestring >=1.0 && <1.3
    , bytestring ==0.10.*
    , case-insensitive ==1.2.*
@@ -225,30 +243,32 @@ executable smp-agent
    , cryptonite >=0.27 && <0.30
    , cryptostore ==0.2.*
    , data-default ==0.7.*
-    , direct-sqlite ==2.3.*
+    , direct-sqlcipher ==2.3.*
    , directory ==1.3.*
    , filepath ==1.4.*
    , generic-random >=1.3 && <1.5
    , http-types ==0.12.*
    , http2 ==3.0.*
-    , ini ==0.4.*
+    , ini ==0.4.1
    , iso8601-time ==0.1.*
    , memory ==0.15.*
    , mtl ==2.2.*
-    , network ==3.1.2.*
-    , network-transport ==0.5.*
+    , network >=3.1.2.7 && <3.2
+    , network-transport ==0.5.4
    , optparse-applicative >=0.15 && <0.17
    , process ==1.6.*
    , random >=1.1 && <1.3
    , simple-logger ==0.1.*
    , simplexmq
-    , sqlite-simple ==0.4.*
+    , socks ==0.6.*
+    , sqlcipher-simple ==0.4.*
    , stm ==2.5.*
    , template-haskell ==2.16.*
    , text ==1.2.*
    , time ==1.9.*
+    , time-compat ==1.9.*
    , time-manager ==0.0.*
-    , tls >=1.5.7 && <1.6
+    , tls >=1.6.0 && <1.7
    , transformers ==0.5.*
    , unliftio ==0.2.*
    , unliftio-core ==0.2.*
@@ -256,9 +276,9 @@ executable smp-agent
    , x509 ==1.7.*
    , x509-store ==1.6.*
    , x509-validation ==1.6.*
+  default-language: Haskell2010
  if flag(swift)
    cpp-options: -DswiftJSON
-  default-language: Haskell2010

 executable smp-server
  main-is: Main.hs
@@ -275,7 +295,7 @@ executable smp-server
    , asn1-types ==0.3.*
    , async ==2.2.*
    , attoparsec ==0.14.*
-    , base >=4.7 && <5
+    , base >=4.14 && <5
    , base64-bytestring >=1.0 && <1.3
    , bytestring ==0.10.*
    , case-insensitive ==1.2.*
@@ -285,30 +305,32 @@ executable smp-server
    , cryptonite >=0.27 && <0.30
    , cryptostore ==0.2.*
    , data-default ==0.7.*
-    , direct-sqlite ==2.3.*
+    , direct-sqlcipher ==2.3.*
    , directory ==1.3.*
    , filepath ==1.4.*
    , generic-random >=1.3 && <1.5
    , http-types ==0.12.*
    , http2 ==3.0.*
-    , ini ==0.4.*
+    , ini ==0.4.1
    , iso8601-time ==0.1.*
    , memory ==0.15.*
    , mtl ==2.2.*
-    , network ==3.1.2.*
-    , network-transport ==0.5.*
+    , network >=3.1.2.7 && <3.2
+    , network-transport ==0.5.4
    , optparse-applicative >=0.15 && <0.17
    , process ==1.6.*
    , random >=1.1 && <1.3
    , simple-logger ==0.1.*
    , simplexmq
-    , sqlite-simple ==0.4.*
+    , socks ==0.6.*
+    , sqlcipher-simple ==0.4.*
    , stm ==2.5.*
    , template-haskell ==2.16.*
    , text ==1.2.*
    , time ==1.9.*
+    , time-compat ==1.9.*
    , time-manager ==0.0.*
-    , tls >=1.5.7 && <1.6
+    , tls >=1.6.0 && <1.7
    , transformers ==0.5.*
    , unliftio ==0.2.*
    , unliftio-core ==0.2.*
@@ -316,9 +338,9 @@ executable smp-server
    , x509 ==1.7.*
    , x509-store ==1.6.*
    , x509-validation ==1.6.*
+  default-language: Haskell2010
  if flag(swift)
    cpp-options: -DswiftJSON
-  default-language: Haskell2010

 test-suite smp-server-test
  type: exitcode-stdio-1.0
@@ -331,8 +353,11 @@ test-suite smp-server-test
      AgentTests.NotificationTests
      AgentTests.SchemaDump
      AgentTests.SQLiteTests
+      CLITests
+      CoreTests.CryptoTests
      CoreTests.EncodingTests
      CoreTests.ProtocolErrorTests
+      CoreTests.RetryIntervalTests
      CoreTests.VersionRangeTests
      NtfClient
      NtfServerTests
@@ -352,7 +377,7 @@ test-suite smp-server-test
    , asn1-types ==0.3.*
    , async ==2.2.*
    , attoparsec ==0.14.*
-    , base >=4.7 && <5
+    , base >=4.14 && <5
    , base64-bytestring >=1.0 && <1.3
    , bytestring ==0.10.*
    , case-insensitive ==1.2.*
@@ -362,7 +387,7 @@ test-suite smp-server-test
    , cryptonite >=0.27 && <0.30
    , cryptostore ==0.2.*
    , data-default ==0.7.*
-    , direct-sqlite ==2.3.*
+    , direct-sqlcipher ==2.3.*
    , directory ==1.3.*
    , filepath ==1.4.*
    , generic-random >=1.3 && <1.5
@@ -370,25 +395,29 @@ test-suite smp-server-test
    , hspec-core ==2.7.*
    , http-types ==0.12.*
    , http2 ==3.0.*
-    , ini ==0.4.*
+    , ini ==0.4.1
    , iso8601-time ==0.1.*
+    , main-tester ==0.2.*
    , memory ==0.15.*
    , mtl ==2.2.*
-    , network ==3.1.2.*
-    , network-transport ==0.5.*
+    , network >=3.1.2.7 && <3.2
+    , network-transport ==0.5.4
    , optparse-applicative >=0.15 && <0.17
    , process ==1.6.*
    , random >=1.1 && <1.3
+    , silently ==1.2.*
    , simple-logger ==0.1.*
    , simplexmq
-    , sqlite-simple ==0.4.*
+    , socks ==0.6.*
+    , sqlcipher-simple ==0.4.*
    , stm ==2.5.*
    , template-haskell ==2.16.*
    , text ==1.2.*
    , time ==1.9.*
+    , time-compat ==1.9.*
    , time-manager ==0.0.*
    , timeit ==2.0.*
-    , tls >=1.5.7 && <1.6
+    , tls >=1.6.0 && <1.7
    , transformers ==0.5.*
    , unliftio ==0.2.*
    , unliftio-core ==0.2.*
@@ -396,6 +425,6 @@ test-suite smp-server-test
    , x509 ==1.7.*
    , x509-store ==1.6.*
    , x509-validation ==1.6.*
+  default-language: Haskell2010
  if flag(swift)
    cpp-options: -DswiftJSON
-  default-language: Haskell2010
@@ -1,69 +1,132 @@
+{-# LANGUAGE ConstraintKinds #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE NumericUnderscores #-}
+{-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE TypeApplications #-}
 {-# OPTIONS_GHC -fno-warn-unticked-promoted-constructors #-}

 module Simplex.Messaging.Agent.Env.SQLite
-  ( AgentConfig (..),
+  ( AgentMonad,
+    AgentConfig (..),
+    AgentDatabase (..),
+    databaseFile,
    InitialAgentServers (..),
+    NetworkConfig (..),
    defaultAgentConfig,
    defaultReconnectInterval,
    Env (..),
    newSMPAgentEnv,
+    createAgentStore,
+    NtfSupervisor (..),
+    NtfSupervisorCommand (..),
  )
 where

+import Control.Monad.Except
 import Control.Monad.IO.Unlift
+import Control.Monad.Reader
 import Crypto.Random
 import Data.List.NonEmpty (NonEmpty)
 import Data.Time.Clock (NominalDiffTime, nominalDay)
+import Data.Word (Word16)
 import Network.Socket
 import Numeric.Natural
-import Simplex.Messaging.Agent.Protocol (SMPServer)
+import Simplex.Messaging.Agent.Protocol
 import Simplex.Messaging.Agent.RetryInterval
 import Simplex.Messaging.Agent.Store.SQLite
 import qualified Simplex.Messaging.Agent.Store.SQLite.Migrations as Migrations
 import Simplex.Messaging.Client
+import Simplex.Messaging.Client.Agent ()
 import qualified Simplex.Messaging.Crypto as C
-import Simplex.Messaging.Notifications.Client (NtfServer)
+import Simplex.Messaging.Crypto.Ratchet (supportedE2EEncryptVRange)
+import Simplex.Messaging.Notifications.Types
+import Simplex.Messaging.Protocol (NtfServer, supportedSMPClientVRange)
+import Simplex.Messaging.TMap (TMap)
+import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport (TLS, Transport (..))
+import Simplex.Messaging.Transport.Client (defaultSMPPort)
+import Simplex.Messaging.Version
 import System.Random (StdGen, newStdGen)
+import UnliftIO (Async)
 import UnliftIO.STM

+-- | Agent monad with MonadReader Env and MonadError AgentErrorType
+type AgentMonad m = (MonadUnliftIO m, MonadReader Env m, MonadError AgentErrorType m)
+
 data InitialAgentServers = InitialAgentServers
-  { smp :: NonEmpty SMPServer,
-    ntf :: [NtfServer]
+  { smp :: NonEmpty SMPServerWithAuth,
+    ntf :: [NtfServer],
+    netCfg :: NetworkConfig
  }

+data AgentDatabase
+  = AgentDB SQLiteStore
+  | AgentDBFile {dbFile :: FilePath, dbKey :: String}
+
+databaseFile :: AgentDatabase -> FilePath
+databaseFile = \case
+  AgentDB SQLiteStore {dbFilePath} -> dbFilePath
+  AgentDBFile {dbFile} -> dbFile
+
 data AgentConfig = AgentConfig
  { tcpPort :: ServiceName,
    cmdSignAlg :: C.SignAlg,
    connIdBytes :: Int,
    tbqSize :: Natural,
-    dbFile :: FilePath,
-    dbPoolSize :: Int,
+    database :: AgentDatabase,
    yesToMigrations :: Bool,
    smpCfg :: ProtocolClientConfig,
    ntfCfg :: ProtocolClientConfig,
    reconnectInterval :: RetryInterval,
+    messageRetryInterval :: RetryInterval2,
+    messageTimeout :: NominalDiffTime,
    helloTimeout :: NominalDiffTime,
-    resubscriptionConcurrency :: Int,
+    ntfCron :: Word16,
+    ntfWorkerDelay :: Int,
+    ntfSMPWorkerDelay :: Int,
+    ntfSubCheckInterval :: NominalDiffTime,
+    ntfMaxMessages :: Int,
    caCertificateFile :: FilePath,
    privateKeyFile :: FilePath,
-    certificateFile :: FilePath
+    certificateFile :: FilePath,
+    e2eEncryptVRange :: VersionRange,
+    smpAgentVRange :: VersionRange,
+    smpClientVRange :: VersionRange,
+    initialClientId :: Int
  }

 defaultReconnectInterval :: RetryInterval
 defaultReconnectInterval =
  RetryInterval
-    { initialInterval = second,
-      increaseAfter = 10 * second,
-      maxInterval = 10 * second
+    { initialInterval = 2_000000,
+      increaseAfter = 10_000000,
+      maxInterval = 180_000000
+    }
+
+defaultMessageRetryInterval :: RetryInterval2
+defaultMessageRetryInterval =
+  RetryInterval2
+    { riFast =
+        RetryInterval
+          { initialInterval = 1_000000,
+            increaseAfter = 10_000000,
+            maxInterval = 60_000000
+          },
+      riSlow =
+        -- TODO: these timeouts can be increased in v4.6 once most clients are updated
+        -- to resume sending on QCONT messages.
+        -- After that local message expiration period should be also increased.
+        RetryInterval
+          { initialInterval = 10_000000,
+            increaseAfter = 30_000000,
+            maxInterval = 300_000000
+          }
    }
-  where
-    second = 1_000_000

 defaultAgentConfig :: AgentConfig
 defaultAgentConfig =
@@ -72,19 +135,28 @@ defaultAgentConfig =
      cmdSignAlg = C.SignAlg C.SEd448,
      connIdBytes = 12,
      tbqSize = 64,
-      dbFile = "smp-agent.db",
-      dbPoolSize = 4,
+      database = AgentDBFile {dbFile = "smp-agent.db", dbKey = ""},
      yesToMigrations = False,
-      smpCfg = defaultClientConfig {defaultTransport = ("5223", transport @TLS)},
+      smpCfg = defaultClientConfig {defaultTransport = (show defaultSMPPort, transport @TLS)},
      ntfCfg = defaultClientConfig {defaultTransport = ("443", transport @TLS)},
      reconnectInterval = defaultReconnectInterval,
+      messageRetryInterval = defaultMessageRetryInterval,
+      messageTimeout = 2 * nominalDay,
      helloTimeout = 2 * nominalDay,
-      resubscriptionConcurrency = 16,
+      ntfCron = 20, -- minutes
+      ntfWorkerDelay = 100000, -- microseconds
+      ntfSMPWorkerDelay = 500000, -- microseconds
+      ntfSubCheckInterval = nominalDay,
+      ntfMaxMessages = 4,
      -- CA certificate private key is not needed for initialization
      -- ! we do not generate these
      caCertificateFile = "/etc/opt/simplex-agent/ca.crt",
      privateKeyFile = "/etc/opt/simplex-agent/agent.key",
-      certificateFile = "/etc/opt/simplex-agent/agent.crt"
+      certificateFile = "/etc/opt/simplex-agent/agent.crt",
+      e2eEncryptVRange = supportedE2EEncryptVRange,
+      smpAgentVRange = supportedSMPAgentVRange,
+      smpClientVRange = supportedSMPClientVRange,
+      initialClientId = 0
    }

 data Env = Env
@@ -92,13 +164,38 @@ data Env = Env
    store :: SQLiteStore,
    idsDrg :: TVar ChaChaDRG,
    clientCounter :: TVar Int,
-    randomServer :: TVar StdGen
+    randomServer :: TVar StdGen,
+    ntfSupervisor :: NtfSupervisor
  }

 newSMPAgentEnv :: (MonadUnliftIO m, MonadRandom m) => AgentConfig -> m Env
-newSMPAgentEnv config@AgentConfig {dbFile, dbPoolSize, yesToMigrations} = do
+newSMPAgentEnv config@AgentConfig {database, yesToMigrations, initialClientId} = do
  idsDrg <- newTVarIO =<< drgNew
-  store <- liftIO $ createSQLiteStore dbFile dbPoolSize Migrations.app yesToMigrations
-  clientCounter <- newTVarIO 0
+  store <- case database of
+    AgentDB st -> pure st
+    AgentDBFile {dbFile, dbKey} -> liftIO $ createAgentStore dbFile dbKey yesToMigrations
+  clientCounter <- newTVarIO initialClientId
  randomServer <- newTVarIO =<< liftIO newStdGen
-  return Env {config, store, idsDrg, clientCounter, randomServer}
+  ntfSupervisor <- atomically . newNtfSubSupervisor $ tbqSize config
+  return Env {config, store, idsDrg, clientCounter, randomServer, ntfSupervisor}
+
+createAgentStore :: FilePath -> String -> Bool -> IO SQLiteStore
+createAgentStore dbFilePath dbKey = createSQLiteStore dbFilePath dbKey Migrations.app
+
+data NtfSupervisor = NtfSupervisor
+  { ntfTkn :: TVar (Maybe NtfToken),
+    ntfSubQ :: TBQueue (ConnId, NtfSupervisorCommand),
+    ntfWorkers :: TMap NtfServer (TMVar (), Async ()),
+    ntfSMPWorkers :: TMap SMPServer (TMVar (), Async ())
+  }
+
+data NtfSupervisorCommand = NSCCreate | NSCDelete | NSCSmpDelete | NSCNtfWorker NtfServer | NSCNtfSMPWorker SMPServer
+  deriving (Show)
+
+newNtfSubSupervisor :: Natural -> STM NtfSupervisor
+newNtfSubSupervisor qSize = do
+  ntfTkn <- newTVar Nothing
+  ntfSubQ <- newTBQueue qSize
+  ntfWorkers <- TM.empty
+  ntfSMPWorkers <- TM.empty
+  pure NtfSupervisor {ntfTkn, ntfSubQ, ntfWorkers, ntfSMPWorkers}
@@ -0,0 +1,24 @@
+{-# LANGUAGE NamedFieldPuns #-}
+
+module Simplex.Messaging.Agent.Lock where
+
+import Control.Monad (void)
+import Control.Monad.IO.Unlift
+import Data.Functor (($>))
+import qualified UnliftIO.Exception as E
+import UnliftIO.STM
+
+type Lock = TMVar String
+
+withLock :: MonadUnliftIO m => TMVar String -> String -> m a -> m a
+withLock lock name =
+  E.bracket_
+    (atomically $ putTMVar lock name)
+    (void . atomically $ takeTMVar lock)
+
+withGetLock :: MonadUnliftIO m => STM Lock -> String -> m a -> m a
+withGetLock getLock name a =
+  E.bracket
+    (atomically $ getLock >>= \l -> putTMVar l name $> l)
+    (atomically . takeTMVar)
+    (const a)
@@ -0,0 +1,371 @@
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TupleSections #-}
+
+module Simplex.Messaging.Agent.NtfSubSupervisor
+  ( runNtfSupervisor,
+    nsUpdateToken,
+    nsRemoveNtfToken,
+    sendNtfSubCommand,
+    instantNotifications,
+    closeNtfSupervisor,
+    getNtfServer,
+  )
+where
+
+import Control.Concurrent.Async (Async, uninterruptibleCancel)
+import Control.Concurrent.STM (stateTVar)
+import Control.Logger.Simple (logError, logInfo)
+import Control.Monad
+import Control.Monad.Except
+import Control.Monad.IO.Unlift (MonadUnliftIO)
+import Control.Monad.Reader
+import Data.Bifunctor (first)
+import Data.Fixed (Fixed (MkFixed), Pico)
+import qualified Data.Map.Strict as M
+import Data.Text (Text)
+import Data.Time (UTCTime, addUTCTime, diffUTCTime, getCurrentTime, nominalDiffTimeToSeconds)
+import Simplex.Messaging.Agent.Client
+import Simplex.Messaging.Agent.Env.SQLite
+import Simplex.Messaging.Agent.Protocol (AgentErrorType (..), BrokerErrorType (..), ConnId, NotificationsMode (..))
+import qualified Simplex.Messaging.Agent.Protocol as AP
+import Simplex.Messaging.Agent.RetryInterval
+import Simplex.Messaging.Agent.Store
+import Simplex.Messaging.Agent.Store.SQLite
+import Simplex.Messaging.Client.Agent ()
+import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Notifications.Protocol (NtfSubStatus (..), NtfTknStatus (..), SMPQueueNtf (..))
+import Simplex.Messaging.Notifications.Types
+import Simplex.Messaging.Protocol
+import Simplex.Messaging.TMap (TMap)
+import qualified Simplex.Messaging.TMap as TM
+import Simplex.Messaging.Util (tshow, unlessM)
+import System.Random (randomR)
+import UnliftIO (async)
+import UnliftIO.Concurrent (forkIO, threadDelay)
+import qualified UnliftIO.Exception as E
+import UnliftIO.STM
+
+runNtfSupervisor :: forall m. (MonadUnliftIO m, MonadReader Env m) => AgentClient -> m ()
+runNtfSupervisor c = do
+  ns <- asks ntfSupervisor
+  forever $ do
+    cmd@(connId, _) <- atomically . readTBQueue $ ntfSubQ ns
+    handleError connId . agentOperationBracket c AONtfNetwork waitUntilActive $
+      runExceptT (processNtfSub c cmd) >>= \case
+        Left e -> notifyErr connId e
+        Right _ -> return ()
+  where
+    handleError :: ConnId -> m () -> m ()
+    handleError connId = E.handle $ \(e :: E.SomeException) -> do
+      logError $ "runNtfSupervisor error " <> tshow e
+      notifyErr connId e
+    notifyErr connId e = notifyInternalError c connId $ "runNtfSupervisor error " <> show e
+
+processNtfSub :: forall m. AgentMonad m => AgentClient -> (ConnId, NtfSupervisorCommand) -> m ()
+processNtfSub c (connId, cmd) = do
+  logInfo $ "processNtfSub - connId = " <> tshow connId <> " - cmd = " <> tshow cmd
+  case cmd of
+    NSCCreate -> do
+      (a, RcvQueue {server = smpServer, clientNtfCreds}) <- withStore c $ \db -> runExceptT $ do
+        a <- liftIO $ getNtfSubscription db connId
+        q <- ExceptT $ getPrimaryRcvQueue db connId
+        pure (a, q)
+      logInfo $ "processNtfSub, NSCCreate - a = " <> tshow a
+      case a of
+        Nothing -> do
+          withNtfServer c $ \ntfServer -> do
+            case clientNtfCreds of
+              Just ClientNtfCreds {notifierId} -> do
+                let newSub = newNtfSubscription connId smpServer (Just notifierId) ntfServer NASKey
+                withStore' c $ \db -> createNtfSubscription db newSub $ NtfSubNTFAction NSACreate
+                addNtfNTFWorker ntfServer
+              Nothing -> do
+                let newSub = newNtfSubscription connId smpServer Nothing ntfServer NASNew
+                withStore' c $ \db -> createNtfSubscription db newSub $ NtfSubSMPAction NSASmpKey
+                addNtfSMPWorker smpServer
+        (Just (sub@NtfSubscription {ntfSubStatus, ntfServer = subNtfServer, smpServer = smpServer', ntfQueueId}, action_)) -> do
+          case (clientNtfCreds, ntfQueueId) of
+            (Just ClientNtfCreds {notifierId}, Just ntfQueueId')
+              | sameSrvAddr smpServer smpServer' && notifierId == ntfQueueId' -> create
+              | otherwise -> rotate
+            (Nothing, Nothing) -> create
+            _ -> rotate
+          where
+            create :: m ()
+            create = case action_ of
+              -- action was set to NULL after worker internal error
+              Nothing -> resetSubscription
+              Just (action, _)
+                -- subscription was marked for deletion / is being deleted
+                | isDeleteNtfSubAction action -> do
+                  if ntfSubStatus == NASNew || ntfSubStatus == NASOff || ntfSubStatus == NASDeleted
+                    then resetSubscription
+                    else withNtfServer c $ \ntfServer -> do
+                      withStore' c $ \db -> supervisorUpdateNtfSub db sub {ntfServer} (NtfSubNTFAction NSACreate)
+                      addNtfNTFWorker ntfServer
+                | otherwise -> case action of
+                  NtfSubNTFAction _ -> addNtfNTFWorker subNtfServer
+                  NtfSubSMPAction _ -> addNtfSMPWorker smpServer
+            rotate :: m ()
+            rotate = do
+              withStore' c $ \db -> supervisorUpdateNtfSub db sub (NtfSubNTFAction NSARotate)
+              addNtfNTFWorker subNtfServer
+            resetSubscription :: m ()
+            resetSubscription =
+              withNtfServer c $ \ntfServer -> do
+                let sub' = sub {ntfQueueId = Nothing, ntfServer, ntfSubId = Nothing, ntfSubStatus = NASNew}
+                withStore' c $ \db -> supervisorUpdateNtfSub db sub' (NtfSubSMPAction NSASmpKey)
+                addNtfSMPWorker smpServer
+    NSCDelete -> do
+      sub_ <- withStore' c $ \db -> do
+        supervisorUpdateNtfAction db connId (NtfSubNTFAction NSADelete)
+        getNtfSubscription db connId
+      logInfo $ "processNtfSub, NSCDelete - sub_ = " <> tshow sub_
+      case sub_ of
+        (Just (NtfSubscription {ntfServer}, _)) -> addNtfNTFWorker ntfServer
+        _ -> pure () -- err "NSCDelete - no subscription"
+    NSCSmpDelete -> do
+      withStore' c (`getPrimaryRcvQueue` connId) >>= \case
+        Right rq@RcvQueue {server = smpServer} -> do
+          logInfo $ "processNtfSub, NSCSmpDelete - rq = " <> tshow rq
+          withStore' c $ \db -> supervisorUpdateNtfAction db connId (NtfSubSMPAction NSASmpDelete)
+          addNtfSMPWorker smpServer
+        _ -> notifyInternalError c connId "NSCSmpDelete - no rcv queue"
+    NSCNtfWorker ntfServer -> addNtfNTFWorker ntfServer
+    NSCNtfSMPWorker smpServer -> addNtfSMPWorker smpServer
+  where
+    addNtfNTFWorker = addWorker ntfWorkers runNtfWorker
+    addNtfSMPWorker = addWorker ntfSMPWorkers runNtfSMPWorker
+    addWorker ::
+      (NtfSupervisor -> TMap (ProtocolServer s) (TMVar (), Async ())) ->
+      (AgentClient -> ProtocolServer s -> TMVar () -> m ()) ->
+      ProtocolServer s ->
+      m ()
+    addWorker wsSel runWorker srv = do
+      ws <- asks $ wsSel . ntfSupervisor
+      atomically (TM.lookup srv ws) >>= \case
+        Nothing -> do
+          doWork <- newTMVarIO ()
+          worker <- async $ runWorker c srv doWork `E.finally` atomically (TM.delete srv ws)
+          atomically $ TM.insert srv (doWork, worker) ws
+        Just (doWork, _) ->
+          void . atomically $ tryPutTMVar doWork ()
+
+withNtfServer :: AgentMonad m => AgentClient -> (NtfServer -> m ()) -> m ()
+withNtfServer c action = getNtfServer c >>= mapM_ action
+
+runNtfWorker :: forall m. AgentMonad m => AgentClient -> NtfServer -> TMVar () -> m ()
+runNtfWorker c srv doWork = do
+  delay <- asks $ ntfWorkerDelay . config
+  forever $ do
+    void . atomically $ readTMVar doWork
+    agentOperationBracket c AONtfNetwork throwWhenInactive runNtfOperation
+    threadDelay delay
+  where
+    runNtfOperation :: m ()
+    runNtfOperation = do
+      nextSub_ <- withStore' c (`getNextNtfSubNTFAction` srv)
+      logInfo $ "runNtfWorker, nextSub_ " <> tshow nextSub_
+      case nextSub_ of
+        Nothing -> noWorkToDo
+        Just a@(NtfSubscription {connId}, _, _) -> do
+          ri <- asks $ reconnectInterval . config
+          withRetryInterval ri $ \loop ->
+            processAction a
+              `catchError` retryOnError c "NtfWorker" loop (workerInternalError c connId . show)
+    noWorkToDo = void . atomically $ tryTakeTMVar doWork
+    processAction :: (NtfSubscription, NtfSubNTFAction, NtfActionTs) -> m ()
+    processAction (sub@NtfSubscription {connId, smpServer, ntfSubId}, action, actionTs) = do
+      ts <- liftIO getCurrentTime
+      unlessM (rescheduleAction doWork ts actionTs) $
+        case action of
+          NSACreate ->
+            getNtfToken >>= \case
+              Just tkn@NtfToken {ntfTokenId = Just tknId, ntfTknStatus = NTActive, ntfMode = NMInstant} -> do
+                RcvQueue {clientNtfCreds} <- withStore c (`getPrimaryRcvQueue` connId)
+                case clientNtfCreds of
+                  Just ClientNtfCreds {ntfPrivateKey, notifierId} -> do
+                    nSubId <- agentNtfCreateSubscription c tknId tkn (SMPQueueNtf smpServer notifierId) ntfPrivateKey
+                    -- possible improvement: smaller retry until Active, less frequently (daily?) once Active
+                    let actionTs' = addUTCTime 30 ts
+                    withStore' c $ \db ->
+                      updateNtfSubscription db sub {ntfSubId = Just nSubId, ntfSubStatus = NASCreated NSNew} (NtfSubNTFAction NSACheck) actionTs'
+                  _ -> workerInternalError c connId "NSACreate - no notifier queue credentials"
+              _ -> workerInternalError c connId "NSACreate - no active token"
+          NSACheck ->
+            getNtfToken >>= \case
+              Just tkn ->
+                case ntfSubId of
+                  Just nSubId ->
+                    agentNtfCheckSubscription c nSubId tkn >>= \case
+                      NSAuth -> do
+                        getNtfServer c >>= \case
+                          Just ntfServer -> do
+                            withStore' c $ \db ->
+                              updateNtfSubscription db sub {ntfServer, ntfQueueId = Nothing, ntfSubId = Nothing, ntfSubStatus = NASNew} (NtfSubSMPAction NSASmpKey) ts
+                            ns <- asks ntfSupervisor
+                            atomically $ writeTBQueue (ntfSubQ ns) (connId, NSCNtfSMPWorker smpServer)
+                          _ -> workerInternalError c connId "NSACheck - failed to reset subscription, notification server not configured"
+                      status -> updateSubNextCheck ts status
+                  Nothing -> workerInternalError c connId "NSACheck - no subscription ID"
+              _ -> workerInternalError c connId "NSACheck - no active token"
+          NSADelete -> case ntfSubId of
+            Just nSubId ->
+              (getNtfToken >>= mapM_ (agentNtfDeleteSubscription c nSubId))
+                `E.finally` continueDeletion
+            _ -> continueDeletion
+            where
+              continueDeletion = do
+                let sub' = sub {ntfSubId = Nothing, ntfSubStatus = NASOff}
+                withStore' c $ \db -> updateNtfSubscription db sub' (NtfSubSMPAction NSASmpDelete) ts
+                ns <- asks ntfSupervisor
+                atomically $ writeTBQueue (ntfSubQ ns) (connId, NSCNtfSMPWorker smpServer)
+          NSARotate -> case ntfSubId of
+            Just nSubId ->
+              (getNtfToken >>= mapM_ (agentNtfDeleteSubscription c nSubId))
+                `E.finally` deleteCreate
+            _ -> deleteCreate
+            where
+              deleteCreate = do
+                withStore' c $ \db -> deleteNtfSubscription db connId
+                ns <- asks ntfSupervisor
+                atomically $ writeTBQueue (ntfSubQ ns) (connId, NSCCreate)
+      where
+        updateSubNextCheck ts toStatus = do
+          checkInterval <- asks $ ntfSubCheckInterval . config
+          let nextCheckTs = addUTCTime checkInterval ts
+          updateSub (NASCreated toStatus) (NtfSubNTFAction NSACheck) nextCheckTs
+        updateSub toStatus toAction actionTs' =
+          withStore' c $ \db ->
+            updateNtfSubscription db sub {ntfSubStatus = toStatus} toAction actionTs'
+
+runNtfSMPWorker :: forall m. AgentMonad m => AgentClient -> SMPServer -> TMVar () -> m ()
+runNtfSMPWorker c srv doWork = do
+  delay <- asks $ ntfSMPWorkerDelay . config
+  forever $ do
+    void . atomically $ readTMVar doWork
+    agentOperationBracket c AONtfNetwork throwWhenInactive runNtfSMPOperation
+    threadDelay delay
+  where
+    runNtfSMPOperation = do
+      nextSub_ <- withStore' c (`getNextNtfSubSMPAction` srv)
+      logInfo $ "runNtfSMPWorker, nextSub_ " <> tshow nextSub_
+      case nextSub_ of
+        Nothing -> noWorkToDo
+        Just a@(NtfSubscription {connId}, _, _) -> do
+          ri <- asks $ reconnectInterval . config
+          withRetryInterval ri $ \loop ->
+            processAction a
+              `catchError` retryOnError c "NtfSMPWorker" loop (workerInternalError c connId . show)
+    noWorkToDo = void . atomically $ tryTakeTMVar doWork
+    processAction :: (NtfSubscription, NtfSubSMPAction, NtfActionTs) -> m ()
+    processAction (sub@NtfSubscription {connId, ntfServer}, smpAction, actionTs) = do
+      ts <- liftIO getCurrentTime
+      unlessM (rescheduleAction doWork ts actionTs) $
+        case smpAction of
+          NSASmpKey ->
+            getNtfToken >>= \case
+              Just NtfToken {ntfTknStatus = NTActive, ntfMode = NMInstant} -> do
+                rq <- withStore c (`getPrimaryRcvQueue` connId)
+                C.SignAlg a <- asks (cmdSignAlg . config)
+                (ntfPublicKey, ntfPrivateKey) <- liftIO $ C.generateSignatureKeyPair a
+                (rcvNtfPubDhKey, rcvNtfPrivDhKey) <- liftIO C.generateKeyPair'
+                (notifierId, rcvNtfSrvPubDhKey) <- enableQueueNotifications c rq ntfPublicKey rcvNtfPubDhKey
+                let rcvNtfDhSecret = C.dh' rcvNtfSrvPubDhKey rcvNtfPrivDhKey
+                withStore' c $ \db -> do
+                  setRcvQueueNtfCreds db connId $ Just ClientNtfCreds {ntfPublicKey, ntfPrivateKey, notifierId, rcvNtfDhSecret}
+                  updateNtfSubscription db sub {ntfQueueId = Just notifierId, ntfSubStatus = NASKey} (NtfSubNTFAction NSACreate) ts
+                ns <- asks ntfSupervisor
+                atomically $ sendNtfSubCommand ns (connId, NSCNtfWorker ntfServer)
+              _ -> workerInternalError c connId "NSASmpKey - no active token"
+          NSASmpDelete -> do
+            rq_ <- withStore' c $ \db -> do
+              setRcvQueueNtfCreds db connId Nothing
+              getPrimaryRcvQueue db connId
+            mapM_ (disableQueueNotifications c) rq_
+            withStore' c $ \db -> deleteNtfSubscription db connId
+
+rescheduleAction :: AgentMonad m => TMVar () -> UTCTime -> UTCTime -> m Bool
+rescheduleAction doWork ts actionTs
+  | actionTs <= ts = pure False
+  | otherwise = do
+    void . atomically $ tryTakeTMVar doWork
+    void . forkIO $ do
+      threadDelay $ diffInMicros actionTs ts
+      void . atomically $ tryPutTMVar doWork ()
+    pure True
+
+fromPico :: Pico -> Integer
+fromPico (MkFixed i) = i
+
+diffInMicros :: UTCTime -> UTCTime -> Int
+diffInMicros a b = (`div` 1000000) . fromInteger . fromPico . nominalDiffTimeToSeconds $ diffUTCTime a b
+
+retryOnError :: AgentMonad m => AgentClient -> Text -> m () -> (AgentErrorType -> m ()) -> AgentErrorType -> m ()
+retryOnError c name loop done e = do
+  logError $ name <> " error: " <> tshow e
+  case e of
+    BROKER _ NETWORK -> retryLoop
+    BROKER _ TIMEOUT -> retryLoop
+    _ -> done e
+  where
+    retryLoop = do
+      atomically $ endAgentOperation c AONtfNetwork
+      atomically $ throwWhenInactive c
+      atomically $ beginAgentOperation c AONtfNetwork
+      loop
+
+workerInternalError :: AgentMonad m => AgentClient -> ConnId -> String -> m ()
+workerInternalError c connId internalErrStr = do
+  withStore' c $ \db -> setNullNtfSubscriptionAction db connId
+  notifyInternalError c connId internalErrStr
+
+notifyInternalError :: (MonadUnliftIO m) => AgentClient -> ConnId -> String -> m ()
+notifyInternalError AgentClient {subQ} connId internalErrStr = atomically $ writeTBQueue subQ ("", connId, AP.ERR $ AP.INTERNAL internalErrStr)
+
+getNtfToken :: AgentMonad m => m (Maybe NtfToken)
+getNtfToken = do
+  tkn <- asks $ ntfTkn . ntfSupervisor
+  readTVarIO tkn
+
+nsUpdateToken :: NtfSupervisor -> NtfToken -> STM ()
+nsUpdateToken ns tkn = writeTVar (ntfTkn ns) $ Just tkn
+
+nsRemoveNtfToken :: NtfSupervisor -> STM ()
+nsRemoveNtfToken ns = writeTVar (ntfTkn ns) Nothing
+
+sendNtfSubCommand :: NtfSupervisor -> (ConnId, NtfSupervisorCommand) -> STM ()
+sendNtfSubCommand ns cmd = do
+  tkn <- readTVar (ntfTkn ns)
+  when (instantNotifications tkn) $ writeTBQueue (ntfSubQ ns) cmd
+
+instantNotifications :: Maybe NtfToken -> Bool
+instantNotifications = \case
+  Just NtfToken {ntfTknStatus = NTActive, ntfMode = NMInstant} -> True
+  _ -> False
+
+closeNtfSupervisor :: NtfSupervisor -> IO ()
+closeNtfSupervisor ns = do
+  cancelNtfWorkers_ $ ntfWorkers ns
+  cancelNtfWorkers_ $ ntfSMPWorkers ns
+
+cancelNtfWorkers_ :: TMap (ProtocolServer s) (TMVar (), Async ()) -> IO ()
+cancelNtfWorkers_ wsVar = do
+  ws <- atomically $ stateTVar wsVar (,M.empty)
+  mapM_ (uninterruptibleCancel . snd) ws
+
+getNtfServer :: AgentMonad m => AgentClient -> m (Maybe NtfServer)
+getNtfServer c = do
+  ntfServers <- readTVarIO $ ntfServers c
+  case ntfServers of
+    [] -> pure Nothing
+    [srv] -> pure $ Just srv
+    servers -> do
+      gen <- asks randomServer
+      atomically . stateTVar gen $
+        first (Just . (servers !!)) . randomR (0, length servers - 1)
@@ -24,7 +24,16 @@ instance StrEncoding QueryStringParams where
  strP = QSP QEscape . Q.parseSimpleQuery <$> A.takeTill (\c -> c == ' ' || c == '\n')

 queryParam :: StrEncoding a => ByteString -> QueryStringParams -> Parser a
-queryParam name (QSP _ q) =
-  case find ((== name) . fst) q of
-    Just (_, p) -> either fail pure $ parseAll strP p
+queryParam name q =
+  case queryParamStr name q of
+    Just p -> either fail pure $ parseAll strP p
    _ -> fail $ "no qs param " <> B.unpack name
+
+queryParam_ :: StrEncoding a => ByteString -> QueryStringParams -> Parser (Maybe a)
+queryParam_ name q =
+  case queryParamStr name q of
+    Just p -> either fail pure $ parseAll strP p
+    _ -> pure Nothing
+
+queryParamStr :: ByteString -> QueryStringParams -> Maybe ByteString
+queryParamStr name (QSP _ q) = snd <$> find ((== name) . fst) q
@@ -1,10 +1,21 @@
+{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE ScopedTypeVariables #-}

-module Simplex.Messaging.Agent.RetryInterval where
+module Simplex.Messaging.Agent.RetryInterval
+  ( RetryInterval (..),
+    RetryInterval2 (..),
+    RetryIntervalMode (..),
+    withRetryInterval,
+    withRetryLock2,
+  )
+where

-import Control.Concurrent (threadDelay)
+import Control.Concurrent (forkIO, threadDelay)
+import Control.Monad (void)
 import Control.Monad.IO.Class (MonadIO, liftIO)
+import Simplex.Messaging.Util (whenM)
+import UnliftIO.STM

 data RetryInterval = RetryInterval
  { initialInterval :: Int,
@@ -12,17 +23,51 @@ data RetryInterval = RetryInterval
    maxInterval :: Int
  }

+data RetryInterval2 = RetryInterval2
+  { riSlow :: RetryInterval,
+    riFast :: RetryInterval
+  }
+
+data RetryIntervalMode = RISlow | RIFast
+  deriving (Eq)
+
 withRetryInterval :: forall m. MonadIO m => RetryInterval -> (m () -> m ()) -> m ()
-withRetryInterval RetryInterval {initialInterval, increaseAfter, maxInterval} action =
-  callAction 0 initialInterval
+withRetryInterval ri action = callAction 0 $ initialInterval ri
  where
    callAction :: Int -> Int -> m ()
-    callAction elapsedTime delay = action loop
+    callAction elapsed delay = action loop
      where
        loop = do
-          let newDelay =
-                if elapsedTime < increaseAfter || delay == maxInterval
-                  then delay
-                  else min (delay * 3 `div` 2) maxInterval
          liftIO $ threadDelay delay
-          callAction (elapsedTime + delay) newDelay
+          let elapsed' = elapsed + delay
+          callAction elapsed' $ nextDelay elapsed' delay ri
+
+-- This function allows action to toggle between slow and fast retry intervals.
+withRetryLock2 :: forall m. MonadIO m => RetryInterval2 -> TMVar () -> ((RetryIntervalMode -> m ()) -> m ()) -> m ()
+withRetryLock2 RetryInterval2 {riSlow, riFast} lock action =
+  callAction (0, initialInterval riSlow) (0, initialInterval riFast)
+  where
+    callAction :: (Int, Int) -> (Int, Int) -> m ()
+    callAction slow fast = action loop
+      where
+        loop = \case
+          RISlow -> run slow riSlow (`callAction` fast)
+          RIFast -> run fast riFast (callAction slow)
+        run (elapsed, delay) ri call = do
+          wait delay
+          let elapsed' = elapsed + delay
+          call (elapsed', nextDelay elapsed' delay ri)
+        wait delay = do
+          waiting <- newTVarIO True
+          _ <- liftIO . forkIO $ do
+            threadDelay delay
+            atomically $ whenM (readTVar waiting) $ void $ tryPutTMVar lock ()
+          atomically $ do
+            takeTMVar lock
+            writeTVar waiting False
+
+nextDelay :: Int -> Int -> RetryInterval -> Int
+nextDelay elapsed delay RetryInterval {increaseAfter, maxInterval} =
+  if elapsed < increaseAfter || delay == maxInterval
+    then delay
+    else min (delay * 3 `div` 2) maxInterval
@@ -48,7 +48,7 @@ runSMPAgentBlocking (ATransport t) started cfg@AgentConfig {tcpPort, caCertifica
    smpAgent _ = do
      -- tlsServerParams is not in Env to avoid breaking functional API w/t key and certificate generation
      tlsServerParams <- liftIO $ loadTLSServerParams caCertificateFile certificateFile privateKeyFile
-      runTransportServer started tcpPort tlsServerParams $ \(h :: c) -> do
+      runTransportServer started tcpPort tlsServerParams True $ \(h :: c) -> do
        liftIO . putLn h $ "Welcome to SMP agent v" <> B.pack simplexMQVersion
        c <- getAgentClient initServers
        logConnection c True
@@ -3,93 +3,52 @@
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE KindSignatures #-}
+{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE StandaloneDeriving #-}
 {-# OPTIONS_GHC -fno-warn-unticked-promoted-constructors #-}

 module Simplex.Messaging.Agent.Store where

-import Control.Concurrent.STM (TVar)
 import Control.Exception (Exception)
-import Crypto.Random (ChaChaDRG)
+import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.ByteString.Char8 (ByteString)
 import Data.Int (Int64)
 import Data.Kind (Type)
+import Data.List (find)
+import Data.List.NonEmpty (NonEmpty)
+import qualified Data.List.NonEmpty as L
 import Data.Time (UTCTime)
 import Data.Type.Equality
 import Simplex.Messaging.Agent.Protocol
 import qualified Simplex.Messaging.Crypto as C
-import Simplex.Messaging.Crypto.Ratchet (RatchetX448, SkippedMsgDiff, SkippedMsgKeys)
-import Simplex.Messaging.Notifications.Client
-import Simplex.Messaging.Notifications.Protocol (DeviceToken, NtfTknStatus, NtfTokenId)
+import Simplex.Messaging.Crypto.Ratchet (RatchetX448)
+import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Protocol
  ( MsgBody,
+    MsgFlags,
    MsgId,
+    NotifierId,
+    NtfPrivateSignKey,
+    NtfPublicVerifyKey,
    RcvDhSecret,
+    RcvNtfDhSecret,
    RcvPrivateSignKey,
    SndPrivateSignKey,
  )
 import qualified Simplex.Messaging.Protocol as SMP
-
-- * Store management
-
-- | Store class type. Defines store access methods for implementations.
-class Monad m => MonadAgentStore s m where
-  -- Queue and Connection management
-  createRcvConn :: s -> TVar ChaChaDRG -> ConnData -> RcvQueue -> SConnectionMode c -> m ConnId
-  createSndConn :: s -> TVar ChaChaDRG -> ConnData -> SndQueue -> m ConnId
-  getConn :: s -> ConnId -> m SomeConn
-  getRcvConn :: s -> SMPServer -> SMP.RecipientId -> m SomeConn
-  deleteConn :: s -> ConnId -> m ()
-  upgradeRcvConnToDuplex :: s -> ConnId -> SndQueue -> m ()
-  upgradeSndConnToDuplex :: s -> ConnId -> RcvQueue -> m ()
-  setRcvQueueStatus :: s -> RcvQueue -> QueueStatus -> m ()
-  setRcvQueueConfirmedE2E :: s -> RcvQueue -> C.DhSecretX25519 -> m ()
-  setSndQueueStatus :: s -> SndQueue -> QueueStatus -> m ()
-
-  -- Confirmations
-  createConfirmation :: s -> TVar ChaChaDRG -> NewConfirmation -> m ConfirmationId
-  acceptConfirmation :: s -> ConfirmationId -> ConnInfo -> m AcceptedConfirmation
-  getAcceptedConfirmation :: s -> ConnId -> m AcceptedConfirmation
-  removeConfirmations :: s -> ConnId -> m ()
-
-  -- Invitations - sent via Contact connections
-  createInvitation :: s -> TVar ChaChaDRG -> NewInvitation -> m InvitationId
-  getInvitation :: s -> InvitationId -> m Invitation
-  acceptInvitation :: s -> InvitationId -> ConnInfo -> m ()
-  deleteInvitation :: s -> ConnId -> InvitationId -> m ()
-
-  -- Msg management
-  updateRcvIds :: s -> ConnId -> m (InternalId, InternalRcvId, PrevExternalSndId, PrevRcvMsgHash)
-  createRcvMsg :: s -> ConnId -> RcvMsgData -> m ()
-  updateSndIds :: s -> ConnId -> m (InternalId, InternalSndId, PrevSndMsgHash)
-  createSndMsg :: s -> ConnId -> SndMsgData -> m ()
-  getPendingMsgData :: s -> ConnId -> InternalId -> m (Maybe RcvQueue, (AgentMessageType, MsgBody, InternalTs))
-  getPendingMsgs :: s -> ConnId -> m [InternalId]
-  checkRcvMsg :: s -> ConnId -> InternalId -> m ()
-  deleteMsg :: s -> ConnId -> InternalId -> m ()
-
-  -- Double ratchet persistence
-  createRatchetX3dhKeys :: s -> ConnId -> C.PrivateKeyX448 -> C.PrivateKeyX448 -> m ()
-  getRatchetX3dhKeys :: s -> ConnId -> m (C.PrivateKeyX448, C.PrivateKeyX448)
-  createRatchet :: s -> ConnId -> RatchetX448 -> m ()
-  getRatchet :: s -> ConnId -> m RatchetX448
-  getSkippedMsgKeys :: s -> ConnId -> m SkippedMsgKeys
-  updateRatchet :: s -> ConnId -> RatchetX448 -> SkippedMsgDiff -> m ()
-
-  -- Notification device token persistence
-  createNtfToken :: s -> NtfToken -> m ()
-
-  getDeviceNtfToken :: s -> DeviceToken -> m (Maybe NtfToken, [NtfToken])
-  updateNtfTokenRegistration :: s -> NtfToken -> NtfTokenId -> C.DhSecretX25519 -> m ()
-  updateNtfToken :: s -> NtfToken -> NtfTknStatus -> Maybe NtfTknAction -> m ()
-  removeNtfToken :: s -> NtfToken -> m ()
+import Simplex.Messaging.Util ((<$?>))
+import Simplex.Messaging.Version

 -- * Queue types

 -- | A receive queue. SMP queue through which the agent receives messages from a sender.
 data RcvQueue = RcvQueue
-  { server :: SMPServer,
+  { connId :: ConnId,
+    server :: SMPServer,
    -- | recipient queue ID
    rcvId :: SMP.RecipientId,
    -- | key used by the recipient to sign transmissions
@@ -101,15 +60,37 @@ data RcvQueue = RcvQueue
    -- | public sender's DH key and agreed shared DH secret for simple per-queue e2e
    e2eDhSecret :: Maybe C.DhSecretX25519,
    -- | sender queue ID
-    sndId :: Maybe SMP.SenderId,
+    sndId :: SMP.SenderId,
    -- | queue status
-    status :: QueueStatus
+    status :: QueueStatus,
+    -- | database queue ID (within connection), can be Nothing for old queues
+    dbQueueId :: Int64,
+    -- | True for a primary or a next primary queue of the connection (next if dbReplaceQueueId is set)
+    primary :: Bool,
+    -- | database queue ID to replace, Nothing if this queue is not replacing another, `Just Nothing` is used for replacing old queues
+    dbReplaceQueueId :: Maybe Int64,
+    -- | SMP client version
+    smpClientVersion :: Version,
+    -- | credentials used in context of notifications
+    clientNtfCreds :: Maybe ClientNtfCreds
+  }
+  deriving (Eq, Show)
+
+data ClientNtfCreds = ClientNtfCreds
+  { -- | key pair to be used by the notification server to sign transmissions
+    ntfPublicKey :: NtfPublicVerifyKey,
+    ntfPrivateKey :: NtfPrivateSignKey,
+    -- | queue ID to be used by the notification server for NSUB command
+    notifierId :: NotifierId,
+    -- | shared DH secret used to encrypt/decrypt notification metadata (NMsgMeta) from server to recipient
+    rcvNtfDhSecret :: RcvNtfDhSecret
  }
  deriving (Eq, Show)

 -- | A send queue. SMP queue through which the agent sends messages to a recipient.
 data SndQueue = SndQueue
-  { server :: SMPServer,
+  { connId :: ConnId,
+    server :: SMPServer,
    -- | sender queue ID
    sndId :: SMP.SenderId,
    -- | key pair used by the sender to sign transmissions
@@ -120,14 +101,59 @@ data SndQueue = SndQueue
    -- | shared DH secret agreed for simple per-queue e2e encryption
    e2eDhSecret :: C.DhSecretX25519,
    -- | queue status
-    status :: QueueStatus
+    status :: QueueStatus,
+    -- | database queue ID (within connection), can be Nothing for old queues
+    dbQueueId :: Int64,
+    -- | True for a primary or a next primary queue of the connection (next if dbReplaceQueueId is set)
+    primary :: Bool,
+    -- | ID of the queue this one is replacing
+    dbReplaceQueueId :: Maybe Int64,
+    -- | SMP client version
+    smpClientVersion :: Version
  }
  deriving (Eq, Show)

+instance SMPQueue RcvQueue where
+  qServer RcvQueue {server} = server
+  {-# INLINE qServer #-}
+  qAddress RcvQueue {server, rcvId} = (server, rcvId)
+  {-# INLINE qAddress #-}
+  sameQueue addr q = sameQAddress addr (qAddress q)
+  {-# INLINE sameQueue #-}
+
+instance SMPQueue SndQueue where
+  qServer SndQueue {server} = server
+  {-# INLINE qServer #-}
+  qAddress SndQueue {server, sndId} = (server, sndId)
+  {-# INLINE qAddress #-}
+  sameQueue addr q = sameQAddress addr (qAddress q)
+  {-# INLINE sameQueue #-}
+
+findQ :: SMPQueue q => (SMPServer, SMP.QueueId) -> NonEmpty q -> Maybe q
+findQ = find . sameQueue
+{-# INLINE findQ #-}
+
+removeQ :: SMPQueue q => (SMPServer, SMP.QueueId) -> NonEmpty q -> Maybe (q, [q])
+removeQ = removeQP . sameQueue
+{-# INLINE removeQ #-}
+
+removeQP :: (q -> Bool) -> NonEmpty q -> Maybe (q, [q])
+removeQP p qs = case L.break p qs of
+  (_, []) -> Nothing
+  (qs1, q : qs2) -> Just (q, qs1 <> qs2)
+
+sndAddress :: RcvQueue -> (SMPServer, SMP.SenderId)
+sndAddress RcvQueue {server, sndId} = (server, sndId)
+{-# INLINE sndAddress #-}
+
+findRQ :: (SMPServer, SMP.SenderId) -> NonEmpty RcvQueue -> Maybe RcvQueue
+findRQ sAddr = find $ sameQAddress sAddr . sndAddress
+{-# INLINE findRQ #-}
+
 -- * Connection types

 -- | Type of a connection.
-data ConnType = CRcv | CSnd | CDuplex | CContact deriving (Eq, Show)
+data ConnType = CNew | CRcv | CSnd | CDuplex | CContact deriving (Eq, Show)

 -- | Connection of a specific type.
 --
@@ -140,22 +166,33 @@ data ConnType = CRcv | CSnd | CDuplex | CContact deriving (Eq, Show)
 -- - DuplexConnection is a connection that has both receive and send queues set up,
 --   typically created by upgrading a receive or a send connection with a missing queue.
 data Connection (d :: ConnType) where
+  NewConnection :: ConnData -> Connection CNew
  RcvConnection :: ConnData -> RcvQueue -> Connection CRcv
  SndConnection :: ConnData -> SndQueue -> Connection CSnd
-  DuplexConnection :: ConnData -> RcvQueue -> SndQueue -> Connection CDuplex
+  DuplexConnection :: ConnData -> NonEmpty RcvQueue -> NonEmpty SndQueue -> Connection CDuplex
  ContactConnection :: ConnData -> RcvQueue -> Connection CContact

 deriving instance Eq (Connection d)

 deriving instance Show (Connection d)

+connData :: Connection d -> ConnData
+connData = \case
+  NewConnection cData -> cData
+  RcvConnection cData _ -> cData
+  SndConnection cData _ -> cData
+  DuplexConnection cData _ _ -> cData
+  ContactConnection cData _ -> cData
+
 data SConnType :: ConnType -> Type where
+  SCNew :: SConnType CNew
  SCRcv :: SConnType CRcv
  SCSnd :: SConnType CSnd
  SCDuplex :: SConnType CDuplex
  SCContact :: SConnType CContact

 connType :: SConnType c -> ConnType
+connType SCNew = CNew
 connType SCRcv = CRcv
 connType SCSnd = CSnd
 connType SCDuplex = CDuplex
@@ -183,9 +220,127 @@ instance Eq SomeConn where

 deriving instance Show SomeConn

-newtype ConnData = ConnData {connId :: ConnId}
+data ConnData = ConnData
+  { connId :: ConnId,
+    connAgentVersion :: Version,
+    enableNtfs :: Bool,
+    duplexHandshake :: Maybe Bool, -- added in agent protocol v2
+    deleted :: Bool
+  }
  deriving (Eq, Show)

+data AgentCmdType = ACClient | ACInternal
+
+instance StrEncoding AgentCmdType where
+  strEncode = \case
+    ACClient -> "CLIENT"
+    ACInternal -> "INTERNAL"
+  strP =
+    A.takeTill (== ' ') >>= \case
+      "CLIENT" -> pure ACClient
+      "INTERNAL" -> pure ACInternal
+      _ -> fail "bad AgentCmdType"
+
+data AgentCommand
+  = AClientCommand (ACommand 'Client)
+  | AInternalCommand InternalCommand
+
+instance StrEncoding AgentCommand where
+  strEncode = \case
+    AClientCommand cmd -> strEncode (ACClient, Str $ serializeCommand cmd)
+    AInternalCommand cmd -> strEncode (ACInternal, cmd)
+  strP =
+    strP_ >>= \case
+      ACClient -> AClientCommand <$> ((\(ACmd _ cmd) -> checkParty cmd) <$?> dbCommandP)
+      ACInternal -> AInternalCommand <$> strP
+
+data AgentCommandTag
+  = AClientCommandTag (ACommandTag 'Client)
+  | AInternalCommandTag InternalCommandTag
+  deriving (Show)
+
+instance StrEncoding AgentCommandTag where
+  strEncode = \case
+    AClientCommandTag t -> strEncode (ACClient, t)
+    AInternalCommandTag t -> strEncode (ACInternal, t)
+  strP =
+    strP_ >>= \case
+      ACClient -> AClientCommandTag <$> strP
+      ACInternal -> AInternalCommandTag <$> strP
+
+data InternalCommand
+  = ICAck SMP.RecipientId MsgId
+  | ICAckDel SMP.RecipientId MsgId InternalId
+  | ICAllowSecure SMP.RecipientId SMP.SndPublicVerifyKey
+  | ICDuplexSecure SMP.RecipientId SMP.SndPublicVerifyKey
+  | ICDeleteConn
+  | ICQSecure SMP.RecipientId SMP.SndPublicVerifyKey
+  | ICQDelete SMP.RecipientId
+
+data InternalCommandTag
+  = ICAck_
+  | ICAckDel_
+  | ICAllowSecure_
+  | ICDuplexSecure_
+  | ICDeleteConn_
+  | ICQSecure_
+  | ICQDelete_
+  deriving (Show)
+
+instance StrEncoding InternalCommand where
+  strEncode = \case
+    ICAck rId srvMsgId -> strEncode (ICAck_, rId, srvMsgId)
+    ICAckDel rId srvMsgId mId -> strEncode (ICAckDel_, rId, srvMsgId, mId)
+    ICAllowSecure rId sndKey -> strEncode (ICAllowSecure_, rId, sndKey)
+    ICDuplexSecure rId sndKey -> strEncode (ICDuplexSecure_, rId, sndKey)
+    ICDeleteConn -> strEncode ICDeleteConn_
+    ICQSecure rId senderKey -> strEncode (ICQSecure_, rId, senderKey)
+    ICQDelete rId -> strEncode (ICQDelete_, rId)
+  strP =
+    strP >>= \case
+      ICAck_ -> ICAck <$> _strP <*> _strP
+      ICAckDel_ -> ICAckDel <$> _strP <*> _strP <*> _strP
+      ICAllowSecure_ -> ICAllowSecure <$> _strP <*> _strP
+      ICDuplexSecure_ -> ICDuplexSecure <$> _strP <*> _strP
+      ICDeleteConn_ -> pure ICDeleteConn
+      ICQSecure_ -> ICQSecure <$> _strP <*> _strP
+      ICQDelete_ -> ICQDelete <$> _strP
+
+instance StrEncoding InternalCommandTag where
+  strEncode = \case
+    ICAck_ -> "ACK"
+    ICAckDel_ -> "ACK_DEL"
+    ICAllowSecure_ -> "ALLOW_SECURE"
+    ICDuplexSecure_ -> "DUPLEX_SECURE"
+    ICDeleteConn_ -> "DELETE_CONN"
+    ICQSecure_ -> "QSECURE"
+    ICQDelete_ -> "QDELETE"
+  strP =
+    A.takeTill (== ' ') >>= \case
+      "ACK" -> pure ICAck_
+      "ACK_DEL" -> pure ICAckDel_
+      "ALLOW_SECURE" -> pure ICAllowSecure_
+      "DUPLEX_SECURE" -> pure ICDuplexSecure_
+      "DELETE_CONN" -> pure ICDeleteConn_
+      "QSECURE" -> pure ICQSecure_
+      "QDELETE" -> pure ICQDelete_
+      _ -> fail "bad InternalCommandTag"
+
+agentCommandTag :: AgentCommand -> AgentCommandTag
+agentCommandTag = \case
+  AClientCommand cmd -> AClientCommandTag $ aCommandTag cmd
+  AInternalCommand cmd -> AInternalCommandTag $ internalCmdTag cmd
+
+internalCmdTag :: InternalCommand -> InternalCommandTag
+internalCmdTag = \case
+  ICAck {} -> ICAck_
+  ICAckDel {} -> ICAckDel_
+  ICAllowSecure {} -> ICAllowSecure_
+  ICDuplexSecure {} -> ICDuplexSecure_
+  ICDeleteConn -> ICDeleteConn_
+  ICQSecure {} -> ICQSecure_
+  ICQDelete _ -> ICQDelete_
+
 -- * Confirmation types

 data NewConfirmation = NewConfirmation
@@ -230,30 +385,42 @@ type PrevRcvMsgHash = MsgHash
 -- | Corresponds to `last_snd_msg_hash` in `connections` table
 type PrevSndMsgHash = MsgHash

-- * Message data containers - used on Msg creation to reduce number of parameters
+-- * Message data containers

 data RcvMsgData = RcvMsgData
  { msgMeta :: MsgMeta,
    msgType :: AgentMessageType,
+    msgFlags :: MsgFlags,
    msgBody :: MsgBody,
    internalRcvId :: InternalRcvId,
    internalHash :: MsgHash,
    externalPrevSndHash :: MsgHash
  }

+data RcvMsg = RcvMsg
+  { internalId :: InternalId,
+    msgMeta :: MsgMeta,
+    msgBody :: MsgBody,
+    userAck :: Bool
+  }
+
 data SndMsgData = SndMsgData
  { internalId :: InternalId,
    internalSndId :: InternalSndId,
    internalTs :: InternalTs,
    msgType :: AgentMessageType,
+    msgFlags :: MsgFlags,
    msgBody :: MsgBody,
    internalHash :: MsgHash,
    prevMsgHash :: MsgHash
  }

-data PendingMsg = PendingMsg
-  { connId :: ConnId,
-    msgId :: InternalId
+data PendingMsgData = PendingMsgData
+  { msgId :: InternalId,
+    msgType :: AgentMessageType,
+    msgFlags :: MsgFlags,
+    msgBody :: MsgBody,
+    internalTs :: InternalTs
  }
  deriving (Show)

@@ -288,8 +455,14 @@ data MsgBase = MsgBase

 newtype InternalId = InternalId {unId :: Int64} deriving (Eq, Show)

+instance StrEncoding InternalId where
+  strEncode = strEncode . unId
+  strP = InternalId <$> strP
+
 type InternalTs = UTCTime

+type AsyncCmdId = Int64
+
 -- * Store errors

 -- | Agent store error.
@@ -311,6 +484,8 @@ data StoreError
    SEInvitationNotFound
  | -- | Message not found
    SEMsgNotFound
+  | -- | Command not found
+    SECmdNotFound
  | -- | Currently not used. The intention was to pass current expected queue status in methods,
    -- as we always know what it should be at any stage of the protocol,
    -- and in case it does not match use this error.
@@ -319,6 +494,6 @@ data StoreError
    SERatchetNotFound
  | -- | connection does not have associated x3dh keys
    SEX3dhKeysNotFound
-  | -- | Used in `getMsg` that is not implemented/used. TODO remove.
-    SENotImplemented
+  | -- | Used to wrap agent errors inside store operations to avoid race conditions
+    SEAgentError AgentErrorType
  deriving (Eq, Show, Exception)
@@ -1,5 +1,6 @@
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedLists #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE QuasiQuotes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
@@ -15,18 +16,29 @@ module Simplex.Messaging.Agent.Store.SQLite.Migrations
  )
 where

-import Control.Monad (forM_)
-import Data.Function (on)
-import Data.List (intercalate, sortBy)
+import Control.Monad (forM_, when)
+import Data.List (intercalate, sortOn)
+import Data.List.NonEmpty (NonEmpty)
+import qualified Data.Map as M
 import Data.Text (Text)
+import Data.Text.Encoding (decodeLatin1)
 import Data.Time.Clock (getCurrentTime)
 import Database.SQLite.Simple (Connection, Only (..), Query (..))
 import qualified Database.SQLite.Simple as DB
 import Database.SQLite.Simple.QQ (sql)
 import qualified Database.SQLite3 as SQLite3
+import Simplex.Messaging.Agent.Protocol (extraSMPServerHosts)
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220101_initial
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220301_snd_queue_keys
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220322_notifications
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220608_v2
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220625_v2_ntf_mode
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220811_onion_hosts
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220817_connection_ntfs
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220905_commands
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220915_connection_queues
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Transport.Client (TransportHost)

 data Migration = Migration {name :: String, up :: Text}
  deriving (Show)
@@ -35,12 +47,18 @@ schemaMigrations :: [(String, Query)]
 schemaMigrations =
  [ ("20220101_initial", m20220101_initial),
    ("20220301_snd_queue_keys", m20220301_snd_queue_keys),
-    ("20220322_notifications", m20220322_notifications)
+    ("20220322_notifications", m20220322_notifications),
+    ("20220607_v2", m20220608_v2),
+    ("m20220625_v2_ntf_mode", m20220625_v2_ntf_mode),
+    ("m20220811_onion_hosts", m20220811_onion_hosts),
+    ("m20220817_connection_ntfs", m20220817_connection_ntfs),
+    ("m20220905_commands", m20220905_commands),
+    ("m20220915_connection_queues", m20220915_connection_queues)
  ]

 -- | The list of migrations in ascending order by date
 app :: [Migration]
-app = sortBy (compare `on` name) $ map migration schemaMigrations
+app = sortOn name $ map migration schemaMigrations
  where
    migration (name, query) = Migration {name = name, up = fromQuery query}

@@ -50,11 +68,16 @@ get conn migrations =
    <$> DB.query_ conn "SELECT name FROM migrations ORDER BY name ASC;"

 run :: Connection -> [Migration] -> IO ()
-run conn ms = DB.withImmediateTransaction conn . forM_ ms $
-  \Migration {name, up} -> insert name >> execSQL up
+run conn ms = forM_ ms $ \Migration {name, up} -> do
+  when (name == "m20220811_onion_hosts") updateServers
+  DB.withImmediateTransaction conn $ insert name >> execSQL up
  where
    insert name = DB.execute conn "INSERT INTO migrations (name, ts) VALUES (?, ?);" . (name,) =<< getCurrentTime
    execSQL = SQLite3.exec $ DB.connectionHandle conn
+    updateServers = forM_ (M.assocs extraSMPServerHosts) $ \(h, h') ->
+      DB.withImmediateTransaction conn $
+        let hs = decodeLatin1 . strEncode $ ([h, h'] :: NonEmpty TransportHost)
+         in DB.execute conn "UPDATE servers SET host = ? WHERE host = ?" (hs, decodeLatin1 $ strEncode h)

 initialize :: Connection -> IO ()
 initialize conn =
@@ -107,8 +107,8 @@ CREATE TABLE snd_messages (
 CREATE TABLE conn_confirmations (
  confirmation_id BLOB NOT NULL PRIMARY KEY,
  conn_id BLOB NOT NULL REFERENCES connections ON DELETE CASCADE,
-  e2e_snd_pub_key BLOB NOT NULL, -- TODO per-queue key. Split?
-  sender_key BLOB NOT NULL, -- TODO per-queue key. Split?
+  e2e_snd_pub_key BLOB NOT NULL,
+  sender_key BLOB NOT NULL,
  ratchet_state BLOB NOT NULL,
  sender_conn_info BLOB NOT NULL,
  accepted INTEGER NOT NULL,
@@ -18,8 +18,8 @@ CREATE TABLE ntf_servers (
 ) WITHOUT ROWID;

 CREATE TABLE ntf_tokens (
-  provider TEXT NOT NULL, -- apn
-  device_token TEXT NOT NULL,
+  provider TEXT NOT NULL, -- apns
+  device_token TEXT NOT NULL, -- ! this field is mislabeled and is actually saved as binary
  ntf_host TEXT NOT NULL,
  ntf_port TEXT NOT NULL,
  tkn_id BLOB, -- token ID assigned by notifications server
@@ -1,38 +0,0 @@
-{-# LANGUAGE QuasiQuotes #-}
-
-module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220404_ntf_subscriptions_draft where
-
-import Database.SQLite.Simple (Query)
-import Database.SQLite.Simple.QQ (sql)
-
-m20220404_ntf_subscriptions_draft :: Query
-m20220404_ntf_subscriptions_draft =
-  [sql|
-ALTER TABLE rcv_queues ADD COLUMN ntf_id BLOB;
-
-ALTER TABLE rcv_queues ADD COLUMN ntf_public_key BLOB;
-
-ALTER TABLE rcv_queues ADD COLUMN ntf_private_key BLOB;
-
-CREATE UNIQUE INDEX idx_rcv_queues_ntf ON rcv_queues (host, port, ntf_id);
-
-CREATE TABLE ntf_subscriptions (
-  ntf_host TEXT NOT NULL,
-  ntf_port TEXT NOT NULL,
-  ntf_sub_id BLOB NOT NULL,
-  ntf_sub_status TEXT NOT NULL, -- new, created, active, pending, error_auth
-  ntf_sub_action TEXT, -- if there is an action required on this subscription: create / check / token / delete
-  ntf_sub_action_ts TEXT, -- the earliest time for the action, e.g. checks can be scheduled every X hours
-  ntf_token TEXT NOT NULL, -- or BLOB?
-  smp_host TEXT NOT NULL,
-  smp_port TEXT NOT NULL,
-  smp_ntf_id BLOB NOT NULL,
-  created_at TEXT NOT NULL,
-  updated_at TEXT NOT NULL, -- this is to check subscription status periodically to know when it was last checked
-  PRIMARY KEY (ntf_host, ntf_port, ntf_sub_id),
-  FOREIGN KEY (ntf_host, ntf_port) REFERENCES ntf_servers
-    ON DELETE RESTRICT ON UPDATE CASCADE,
-  FOREIGN KEY (smp_host, smp_port, smp_ntf_id) REFERENCES rcv_queues (host, port, ntf_id)
-    ON DELETE RESTRICT ON UPDATE CASCADE
-) WITHOUT ROWID;
-|]
@@ -0,0 +1,50 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220608_v2 where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20220608_v2 :: Query
+m20220608_v2 =
+  [sql|
+ALTER TABLE messages ADD COLUMN msg_flags TEXT NULL;
+
+ALTER TABLE conn_confirmations ADD COLUMN smp_reply_queues BLOB NULL;
+
+ALTER TABLE connections ADD COLUMN duplex_handshake INTEGER NULL DEFAULT 0;
+
+ALTER TABLE rcv_messages ADD COLUMN user_ack INTEGER NULL DEFAULT 0;
+
+ALTER TABLE rcv_queues ADD COLUMN ntf_public_key BLOB;
+
+ALTER TABLE rcv_queues ADD COLUMN ntf_private_key BLOB;
+
+ALTER TABLE rcv_queues ADD COLUMN ntf_id BLOB;
+
+ALTER TABLE rcv_queues ADD COLUMN rcv_ntf_dh_secret BLOB;
+
+CREATE UNIQUE INDEX idx_rcv_queues_ntf ON rcv_queues (host, port, ntf_id);
+
+CREATE TABLE ntf_subscriptions (
+  conn_id BLOB NOT NULL,
+  smp_host TEXT NULL,
+  smp_port TEXT NULL,
+  smp_ntf_id BLOB,
+  ntf_host TEXT NOT NULL,
+  ntf_port TEXT NOT NULL,
+  ntf_sub_id BLOB,
+  ntf_sub_status TEXT NOT NULL, -- see NtfAgentSubStatus
+  ntf_sub_action TEXT, -- if there is an action required on this subscription: NtfSubNTFAction
+  ntf_sub_smp_action TEXT, -- action with SMP server: NtfSubSMPAction; only one of this and ntf_sub_action can (should) be not null in same record
+  ntf_sub_action_ts TEXT, -- the earliest time for the action, e.g. checks can be scheduled every X hours
+  updated_by_supervisor INTEGER NOT NULL DEFAULT 0, -- to be checked on updates by workers to not overwrite supervisor command (state still should be updated)
+  created_at TEXT NOT NULL DEFAULT (datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT (datetime('now')),
+  PRIMARY KEY (conn_id),
+  FOREIGN KEY (smp_host, smp_port) REFERENCES servers (host, port)
+    ON DELETE SET NULL ON UPDATE CASCADE,
+  FOREIGN KEY (ntf_host, ntf_port) REFERENCES ntf_servers
+    ON DELETE RESTRICT ON UPDATE CASCADE
+) WITHOUT ROWID;
+|]
@@ -0,0 +1,14 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220625_v2_ntf_mode where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20220625_v2_ntf_mode :: Query
+m20220625_v2_ntf_mode =
+  [sql|
+ALTER TABLE ntf_tokens ADD COLUMN ntf_mode TEXT NULL;
+
+DELETE FROM ntf_tokens;
+|]
@@ -0,0 +1,16 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220811_onion_hosts where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20220811_onion_hosts :: Query
+m20220811_onion_hosts =
+  [sql|
+ALTER TABLE conn_confirmations ADD COLUMN smp_client_version INTEGER;
+
+UPDATE ntf_servers
+SET ntf_host = 'ntf2.simplex.im,ntg7jdjy2i3qbib3sykiho3enekwiaqg3icctliqhtqcg6jmoh6cxiad.onion'
+WHERE ntf_host = 'ntf2.simplex.im';
+|]
@@ -0,0 +1,12 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220817_connection_ntfs where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20220817_connection_ntfs :: Query
+m20220817_connection_ntfs =
+  [sql|
+ALTER TABLE connections ADD COLUMN enable_ntfs INTEGER;
+|]
@@ -0,0 +1,23 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220905_commands where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20220905_commands :: Query
+m20220905_commands =
+  [sql|
+CREATE TABLE commands (
+  command_id INTEGER PRIMARY KEY,
+  conn_id BLOB NOT NULL REFERENCES connections ON DELETE CASCADE,
+  host TEXT,
+  port TEXT,
+  corr_id BLOB NOT NULL,
+  command_tag BLOB NOT NULL,
+  command BLOB NOT NULL,
+  agent_version INTEGER NOT NULL DEFAULT 1,
+  FOREIGN KEY (host, port) REFERENCES servers
+    ON DELETE RESTRICT ON UPDATE CASCADE
+);
+|]
@@ -0,0 +1,52 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220915_connection_queues where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20220915_connection_queues :: Query
+m20220915_connection_queues =
+  [sql|
+PRAGMA ignore_check_constraints=ON;
+
+-- rcv_queues
+ALTER TABLE rcv_queues ADD COLUMN rcv_queue_id INTEGER CHECK (rcv_queue_id NOT NULL);
+UPDATE rcv_queues SET rcv_queue_id = 1;
+CREATE UNIQUE INDEX idx_rcv_queue_id ON rcv_queues (conn_id, rcv_queue_id);
+
+ALTER TABLE rcv_queues ADD COLUMN rcv_primary INTEGER CHECK (rcv_primary NOT NULL);
+UPDATE rcv_queues SET rcv_primary = 1;
+
+ALTER TABLE rcv_queues ADD COLUMN replace_rcv_queue_id INTEGER NULL;
+
+-- snd_queues
+ALTER TABLE snd_queues ADD COLUMN snd_queue_id INTEGER CHECK (snd_queue_id NOT NULL);
+UPDATE snd_queues SET snd_queue_id = 1;
+CREATE UNIQUE INDEX idx_snd_queue_id ON snd_queues (conn_id, snd_queue_id);
+
+ALTER TABLE snd_queues ADD COLUMN snd_primary INTEGER CHECK (snd_primary NOT NULL);
+UPDATE snd_queues SET snd_primary = 1;
+
+ALTER TABLE snd_queues ADD COLUMN replace_snd_queue_id INTEGER NULL;
+
+-- connections
+ALTER TABLE connections ADD COLUMN deleted INTEGER DEFAULT 0 CHECK (deleted NOT NULL);
+UPDATE connections SET deleted = 0;
+
+-- messages
+CREATE TABLE snd_message_deliveries (
+  snd_message_delivery_id INTEGER PRIMARY KEY AUTOINCREMENT,
+  conn_id BLOB NOT NULL REFERENCES connections ON DELETE CASCADE,
+  snd_queue_id INTEGER NOT NULL,
+  internal_id INTEGER NOT NULL,
+  FOREIGN KEY (conn_id, internal_id) REFERENCES messages ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED
+);
+
+CREATE INDEX idx_snd_message_deliveries ON snd_message_deliveries (conn_id, snd_queue_id);
+
+ALTER TABLE rcv_messages ADD COLUMN rcv_queue_id INTEGER CHECK (rcv_queue_id NOT NULL);
+UPDATE rcv_messages SET rcv_queue_id = 1;
+
+PRAGMA ignore_check_constraints=OFF;
+|]
@@ -19,6 +19,10 @@ CREATE TABLE connections(
  last_rcv_msg_hash BLOB NOT NULL DEFAULT x'',
  last_snd_msg_hash BLOB NOT NULL DEFAULT x'',
  smp_agent_version INTEGER NOT NULL DEFAULT 1
+  ,
+  duplex_handshake INTEGER NULL DEFAULT 0,
+  enable_ntfs INTEGER,
+  deleted INTEGER DEFAULT 0 CHECK(deleted NOT NULL)
 ) WITHOUT ROWID;
 CREATE TABLE rcv_queues(
  host TEXT NOT NULL,
@@ -34,6 +38,13 @@ CREATE TABLE rcv_queues(
  status TEXT NOT NULL,
  smp_server_version INTEGER NOT NULL DEFAULT 1,
  smp_client_version INTEGER,
+  ntf_public_key BLOB,
+  ntf_private_key BLOB,
+  ntf_id BLOB,
+  rcv_ntf_dh_secret BLOB,
+  rcv_queue_id INTEGER CHECK(rcv_queue_id NOT NULL),
+  rcv_primary INTEGER CHECK(rcv_primary NOT NULL),
+  replace_rcv_queue_id INTEGER NULL,
  PRIMARY KEY(host, port, rcv_id),
  FOREIGN KEY(host, port) REFERENCES servers
  ON DELETE RESTRICT ON UPDATE CASCADE,
@@ -51,6 +62,9 @@ CREATE TABLE snd_queues(
  smp_client_version INTEGER NOT NULL DEFAULT 1,
  snd_public_key BLOB,
  e2e_pub_key BLOB,
+  snd_queue_id INTEGER CHECK(snd_queue_id NOT NULL),
+  snd_primary INTEGER CHECK(snd_primary NOT NULL),
+  replace_snd_queue_id INTEGER NULL,
  PRIMARY KEY(host, port, snd_id),
  FOREIGN KEY(host, port) REFERENCES servers
  ON DELETE RESTRICT ON UPDATE CASCADE
@@ -64,6 +78,7 @@ CREATE TABLE messages(
  internal_snd_id INTEGER,
  msg_type BLOB NOT NULL, --(H)ELLO,(R)EPLY,(D)ELETE. Should SMP confirmation be saved too?
  msg_body BLOB NOT NULL DEFAULT x'',
+  msg_flags TEXT NULL,
  PRIMARY KEY(conn_id, internal_id),
  FOREIGN KEY(conn_id, internal_rcv_id) REFERENCES rcv_messages
  ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED,
@@ -80,6 +95,8 @@ CREATE TABLE rcv_messages(
  internal_hash BLOB NOT NULL,
  external_prev_snd_hash BLOB NOT NULL,
  integrity BLOB NOT NULL,
+  user_ack INTEGER NULL DEFAULT 0,
+  rcv_queue_id INTEGER CHECK(rcv_queue_id NOT NULL),
  PRIMARY KEY(conn_id, internal_rcv_id),
  FOREIGN KEY(conn_id, internal_id) REFERENCES messages
  ON DELETE CASCADE
@@ -97,13 +114,16 @@ CREATE TABLE snd_messages(
 CREATE TABLE conn_confirmations(
  confirmation_id BLOB NOT NULL PRIMARY KEY,
  conn_id BLOB NOT NULL REFERENCES connections ON DELETE CASCADE,
-  e2e_snd_pub_key BLOB NOT NULL, -- TODO per-queue key. Split?
-  sender_key BLOB NOT NULL, -- TODO per-queue key. Split?
+  e2e_snd_pub_key BLOB NOT NULL,
+  sender_key BLOB NOT NULL,
  ratchet_state BLOB NOT NULL,
  sender_conn_info BLOB NOT NULL,
  accepted INTEGER NOT NULL,
  own_conn_info BLOB,
  created_at TEXT NOT NULL DEFAULT(datetime('now'))
+  ,
+  smp_reply_queues BLOB NULL,
+  smp_client_version INTEGER
 ) WITHOUT ROWID;
 CREATE TABLE conn_invitations(
  invitation_id BLOB NOT NULL PRIMARY KEY,
@@ -141,8 +161,8 @@ CREATE TABLE ntf_servers(
  PRIMARY KEY(ntf_host, ntf_port)
 ) WITHOUT ROWID;
 CREATE TABLE ntf_tokens(
-  provider TEXT NOT NULL, -- apn
-  device_token TEXT NOT NULL,
+  provider TEXT NOT NULL, -- apns
+  device_token TEXT NOT NULL, -- ! this field is mislabeled and is actually saved as binary
  ntf_host TEXT NOT NULL,
  ntf_port TEXT NOT NULL,
  tkn_id BLOB, -- token ID assigned by notifications server
@@ -154,8 +174,57 @@ tkn_dh_secret BLOB, -- DH secret for e2e encryption of notifications
  tkn_status TEXT NOT NULL,
  tkn_action BLOB,
  created_at TEXT NOT NULL DEFAULT(datetime('now')),
-  updated_at TEXT NOT NULL DEFAULT(datetime('now')), -- this is to check token status periodically to know when it was last checked
+  updated_at TEXT NOT NULL DEFAULT(datetime('now')),
+  ntf_mode TEXT NULL, -- this is to check token status periodically to know when it was last checked
  PRIMARY KEY(provider, device_token, ntf_host, ntf_port),
  FOREIGN KEY(ntf_host, ntf_port) REFERENCES ntf_servers
  ON DELETE RESTRICT ON UPDATE CASCADE
 ) WITHOUT ROWID;
+CREATE UNIQUE INDEX idx_rcv_queues_ntf ON rcv_queues(host, port, ntf_id);
+CREATE TABLE ntf_subscriptions(
+  conn_id BLOB NOT NULL,
+  smp_host TEXT NULL,
+  smp_port TEXT NULL,
+  smp_ntf_id BLOB,
+  ntf_host TEXT NOT NULL,
+  ntf_port TEXT NOT NULL,
+  ntf_sub_id BLOB,
+  ntf_sub_status TEXT NOT NULL, -- see NtfAgentSubStatus
+  ntf_sub_action TEXT, -- if there is an action required on this subscription: NtfSubNTFAction
+  ntf_sub_smp_action TEXT, -- action with SMP server: NtfSubSMPAction; only one of this and ntf_sub_action can(should) be not null in same record
+  ntf_sub_action_ts TEXT, -- the earliest time for the action, e.g. checks can be scheduled every X hours
+  updated_by_supervisor INTEGER NOT NULL DEFAULT 0, -- to be checked on updates by workers to not overwrite supervisor command(state still should be updated)
+  created_at TEXT NOT NULL DEFAULT(datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT(datetime('now')),
+  PRIMARY KEY(conn_id),
+  FOREIGN KEY(smp_host, smp_port) REFERENCES servers(host, port)
+  ON DELETE SET NULL ON UPDATE CASCADE,
+  FOREIGN KEY(ntf_host, ntf_port) REFERENCES ntf_servers
+  ON DELETE RESTRICT ON UPDATE CASCADE
+) WITHOUT ROWID;
+CREATE TABLE commands(
+  command_id INTEGER PRIMARY KEY,
+  conn_id BLOB NOT NULL REFERENCES connections ON DELETE CASCADE,
+  host TEXT,
+  port TEXT,
+  corr_id BLOB NOT NULL,
+  command_tag BLOB NOT NULL,
+  command BLOB NOT NULL,
+  agent_version INTEGER NOT NULL DEFAULT 1,
+  FOREIGN KEY(host, port) REFERENCES servers
+  ON DELETE RESTRICT ON UPDATE CASCADE
+);
+CREATE UNIQUE INDEX idx_rcv_queue_id ON rcv_queues(conn_id, rcv_queue_id);
+CREATE UNIQUE INDEX idx_snd_queue_id ON snd_queues(conn_id, snd_queue_id);
+CREATE TABLE snd_message_deliveries(
+  snd_message_delivery_id INTEGER PRIMARY KEY AUTOINCREMENT,
+  conn_id BLOB NOT NULL REFERENCES connections ON DELETE CASCADE,
+  snd_queue_id INTEGER NOT NULL,
+  internal_id INTEGER NOT NULL,
+  FOREIGN KEY(conn_id, internal_id) REFERENCES messages ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED
+);
+CREATE TABLE sqlite_sequence(name,seq);
+CREATE INDEX idx_snd_message_deliveries ON snd_message_deliveries(
+  conn_id,
+  snd_queue_id
+);
@@ -0,0 +1,48 @@
+{-# LANGUAGE NamedFieldPuns #-}
+
+module Simplex.Messaging.Agent.TRcvQueues where
+
+import Control.Concurrent.STM
+import qualified Data.Map.Strict as M
+import Data.Set (Set)
+import qualified Data.Set as S
+import Simplex.Messaging.Agent.Protocol (ConnId)
+import Simplex.Messaging.Agent.Store (RcvQueue (..))
+import Simplex.Messaging.Protocol (RecipientId, SMPServer)
+import Simplex.Messaging.TMap (TMap)
+import qualified Simplex.Messaging.TMap as TM
+
+newtype TRcvQueues = TRcvQueues (TMap (SMPServer, RecipientId) RcvQueue)
+
+empty :: STM TRcvQueues
+empty = TRcvQueues <$> TM.empty
+
+clear :: TRcvQueues -> STM ()
+clear (TRcvQueues qs) = TM.clear qs
+
+deleteConn :: ConnId -> TRcvQueues -> STM ()
+deleteConn cId (TRcvQueues qs) = modifyTVar' qs $ M.filter (\rq -> cId /= connId rq)
+
+hasConn :: ConnId -> TRcvQueues -> STM Bool
+hasConn cId (TRcvQueues qs) = any (\rq -> cId == connId rq) <$> readTVar qs
+
+getConns :: TRcvQueues -> STM (Set ConnId)
+getConns (TRcvQueues qs) = M.foldr' (S.insert . connId) S.empty <$> readTVar qs
+
+addQueue :: RcvQueue -> TRcvQueues -> STM ()
+addQueue rq@RcvQueue {server, rcvId} (TRcvQueues qs) = TM.insert (server, rcvId) rq qs
+
+deleteQueue :: RcvQueue -> TRcvQueues -> STM ()
+deleteQueue RcvQueue {server, rcvId} (TRcvQueues qs) = TM.delete (server, rcvId) qs
+
+getSrvQueues :: SMPServer -> TRcvQueues -> STM [RcvQueue]
+getSrvQueues srv (TRcvQueues qs) = M.foldl' addQ [] <$> readTVar qs
+  where
+    addQ qs' rq@RcvQueue {server} = if srv == server then rq : qs' else qs'
+
+getDelSrvQueues :: SMPServer -> TRcvQueues -> STM ([RcvQueue], Set ConnId)
+getDelSrvQueues srv (TRcvQueues qs) = stateTVar qs $ M.foldl' addQ (([], S.empty), M.empty)
+  where
+    addQ (removed@(remQs, remConns), qs') rq@RcvQueue {connId, server, rcvId}
+      | srv == server = ((rq : remQs, S.insert connId remConns), qs')
+      | otherwise = (removed, M.insert (server, rcvId) rq qs')
@@ -1,11 +1,13 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE NumericUnderscores #-}
+{-# LANGUAGE OverloadedLists #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeApplications #-}
@@ -24,17 +26,24 @@
 -- See https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md
 module Simplex.Messaging.Client
  ( -- * Connect (disconnect) client to (from) SMP server
-    ProtocolClient (sessionId),
+    ProtocolClient (thVersion, sessionId, sessionTs),
    SMPClient,
    getProtocolClient,
    closeProtocolClient,
+    clientServer,
+    transportHost',

    -- * SMP protocol command functions
    createSMPQueue,
    subscribeSMPQueue,
+    subscribeSMPQueues,
+    getSMPMessage,
    subscribeSMPQueueNotifications,
    secureSMPQueue,
    enableSMPQueueNotifications,
+    disableSMPQueueNotifications,
+    enableSMPQueuesNtfs,
+    disableSMPQueuesNtfs,
    sendSMPMessage,
    ackSMPMessage,
    suspendSMPQueue,
@@ -44,7 +53,11 @@ module Simplex.Messaging.Client
    -- * Supporting types and client configuration
    ProtocolClientError (..),
    ProtocolClientConfig (..),
+    NetworkConfig (..),
    defaultClientConfig,
+    defaultNetworkConfig,
+    transportClientConfig,
+    chooseTransportHost,
    ServerTransmission,
  )
 where
@@ -54,44 +67,123 @@ import Control.Concurrent.Async
 import Control.Concurrent.STM
 import Control.Exception
 import Control.Monad
-import Control.Monad.Trans.Class
+import Control.Monad.IO.Class (liftIO)
 import Control.Monad.Trans.Except
+import Data.Aeson (FromJSON (..), ToJSON (..))
+import qualified Data.Aeson as J
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
+import Data.Either (rights)
+import Data.Functor (($>))
+import Data.List (find)
+import Data.List.NonEmpty (NonEmpty)
+import qualified Data.List.NonEmpty as L
 import Data.Maybe (fromMaybe)
+import Data.Time.Clock (UTCTime, getCurrentTime)
+import GHC.Generics (Generic)
 import Network.Socket (ServiceName)
 import Numeric.Natural
 import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Parsers (dropPrefix, enumJSON)
 import Simplex.Messaging.Protocol as SMP
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport
-import Simplex.Messaging.Transport.Client (runTransportClient)
+import Simplex.Messaging.Transport.Client (SocksProxy, TransportClientConfig (..), TransportHost (..), runTransportClient)
 import Simplex.Messaging.Transport.KeepAlive
 import Simplex.Messaging.Transport.WebSockets (WS)
-import Simplex.Messaging.Util (bshow, liftError, raceAny_)
+import Simplex.Messaging.Util (bshow, raceAny_)
+import Simplex.Messaging.Version
 import System.Timeout (timeout)

 -- | 'SMPClient' is a handle used to send commands to a specific SMP server.
 --
 -- Use 'getSMPClient' to connect to an SMP server and create a client handle.
 data ProtocolClient msg = ProtocolClient
-  { action :: Async (),
-    connected :: TVar Bool,
+  { action :: Maybe (Async ()),
    sessionId :: SessionId,
-    protocolServer :: ProtocolServer,
+    sessionTs :: UTCTime,
+    thVersion :: Version,
+    client_ :: PClient msg
+  }
+
+data PClient msg = PClient
+  { connected :: TVar Bool,
+    protocolServer :: ProtoServer msg,
+    transportHost :: TransportHost,
    tcpTimeout :: Int,
    clientCorrId :: TVar Natural,
    sentCommands :: TMap CorrId (Request msg),
-    sndQ :: TBQueue SentRawTransmission,
-    rcvQ :: TBQueue (SignedTransmission msg),
+    sndQ :: TBQueue (NonEmpty SentRawTransmission),
+    rcvQ :: TBQueue (NonEmpty (SignedTransmission msg)),
    msgQ :: Maybe (TBQueue (ServerTransmission msg))
  }

 type SMPClient = ProtocolClient SMP.BrokerMsg

+-- | Type for client command data
+type ClientCommand msg = (Maybe C.APrivateSignKey, QueueId, ProtoCommand msg)
+
 -- | Type synonym for transmission from some SPM server queue.
-type ServerTransmission msg = (ProtocolServer, SessionId, QueueId, msg)
+type ServerTransmission msg = (ProtoServer msg, Version, SessionId, QueueId, msg)
+
+data HostMode
+  = -- | prefer (or require) onion hosts when connecting via SOCKS proxy
+    HMOnionViaSocks
+  | -- | prefer (or require) onion hosts
+    HMOnion
+  | -- | prefer (or require) public hosts
+    HMPublic
+  deriving (Eq, Show, Generic)
+
+instance FromJSON HostMode where
+  parseJSON = J.genericParseJSON . enumJSON $ dropPrefix "HM"
+
+instance ToJSON HostMode where
+  toJSON = J.genericToJSON . enumJSON $ dropPrefix "HM"
+  toEncoding = J.genericToEncoding . enumJSON $ dropPrefix "HM"
+
+-- | network configuration for the client
+data NetworkConfig = NetworkConfig
+  { -- | use SOCKS5 proxy
+    socksProxy :: Maybe SocksProxy,
+    -- | determines critera which host is chosen from the list
+    hostMode :: HostMode,
+    -- | if above criteria is not met, if the below setting is True return error, otherwise use the first host
+    requiredHostMode :: Bool,
+    -- | timeout for the initial client TCP/TLS connection (microseconds)
+    tcpConnectTimeout :: Int,
+    -- | timeout of protocol commands (microseconds)
+    tcpTimeout :: Int,
+    -- | TCP keep-alive options, Nothing to skip enabling keep-alive
+    tcpKeepAlive :: Maybe KeepAliveOpts,
+    -- | period for SMP ping commands (microseconds)
+    smpPingInterval :: Int,
+    logTLSErrors :: Bool
+  }
+  deriving (Eq, Show, Generic, FromJSON)
+
+instance ToJSON NetworkConfig where
+  toJSON = J.genericToJSON J.defaultOptions {J.omitNothingFields = True}
+  toEncoding = J.genericToEncoding J.defaultOptions {J.omitNothingFields = True}
+
+defaultNetworkConfig :: NetworkConfig
+defaultNetworkConfig =
+  NetworkConfig
+    { socksProxy = Nothing,
+      hostMode = HMOnionViaSocks,
+      requiredHostMode = False,
+      tcpConnectTimeout = 7_500_000,
+      tcpTimeout = 5_000_000,
+      tcpKeepAlive = Just defaultKeepAliveOpts,
+      smpPingInterval = 600_000_000, -- 10min
+      logTLSErrors = False
+    }
+
+transportClientConfig :: NetworkConfig -> TransportClientConfig
+transportClientConfig NetworkConfig {socksProxy, tcpKeepAlive, logTLSErrors} =
+  TransportClientConfig {socksProxy, tcpKeepAlive, logTLSErrors}

 -- | protocol client configuration.
 data ProtocolClientConfig = ProtocolClientConfig
@@ -99,12 +191,10 @@ data ProtocolClientConfig = ProtocolClientConfig
    qSize :: Natural,
    -- | default server port if port is not specified in ProtocolServer
    defaultTransport :: (ServiceName, ATransport),
-    -- | timeout of TCP commands (microseconds)
-    tcpTimeout :: Int,
-    -- | TCP keep-alive options, Nothing to skip enabling keep-alive
-    tcpKeepAlive :: Maybe KeepAliveOpts,
-    -- | period for SMP ping commands (microseconds)
-    smpPing :: Int
+    -- | network configuration
+    networkConfig :: NetworkConfig,
+    -- | SMP client-server protocol version range
+    smpServerVRange :: VersionRange
  }

 -- | Default protocol client configuration.
@@ -113,9 +203,8 @@ defaultClientConfig =
  ProtocolClientConfig
    { qSize = 64,
      defaultTransport = ("443", transport @TLS),
-      tcpTimeout = 5_000_000,
-      tcpKeepAlive = Just defaultKeepAliveOpts,
-      smpPing = 600_000_000 -- 10min
+      networkConfig = defaultNetworkConfig,
+      smpServerVRange = supportedSMPServerVRange
    }

 data Request msg = Request
@@ -125,29 +214,52 @@ data Request msg = Request

 type Response msg = Either ProtocolClientError msg

+chooseTransportHost :: NetworkConfig -> NonEmpty TransportHost -> Either ProtocolClientError TransportHost
+chooseTransportHost NetworkConfig {socksProxy, hostMode, requiredHostMode} hosts =
+  firstOrError $ case hostMode of
+    HMOnionViaSocks -> maybe publicHost (const onionHost) socksProxy
+    HMOnion -> onionHost
+    HMPublic -> publicHost
+  where
+    firstOrError
+      | requiredHostMode = maybe (Left PCEIncompatibleHost) Right
+      | otherwise = Right . fromMaybe (L.head hosts)
+    isOnionHost = \case THOnionHost _ -> True; _ -> False
+    onionHost = find isOnionHost hosts
+    publicHost = find (not . isOnionHost) hosts
+
+clientServer :: ProtocolTypeI (ProtoType msg) => ProtocolClient msg -> String
+clientServer = B.unpack . strEncode . protocolServer . client_
+
+transportHost' :: ProtocolClient msg -> TransportHost
+transportHost' = transportHost . client_
+
 -- | Connects to 'ProtocolServer' using passed client configuration
 -- and queue for messages and notifications.
 --
 -- A single queue can be used for multiple 'SMPClient' instances,
 -- as 'SMPServerTransmission' includes server information.
-getProtocolClient :: forall msg. Protocol msg => ProtocolServer -> ProtocolClientConfig -> Maybe (TBQueue (ServerTransmission msg)) -> IO () -> IO (Either ProtocolClientError (ProtocolClient msg))
-getProtocolClient protocolServer cfg@ProtocolClientConfig {qSize, tcpTimeout, tcpKeepAlive, smpPing} msgQ disconnected =
-  (atomically mkProtocolClient >>= runClient useTransport)
-    `catch` \(e :: IOException) -> pure . Left $ PCEIOError e
+getProtocolClient :: forall msg. Protocol msg => ProtoServer msg -> ProtocolClientConfig -> Maybe (TBQueue (ServerTransmission msg)) -> (ProtocolClient msg -> IO ()) -> IO (Either ProtocolClientError (ProtocolClient msg))
+getProtocolClient protocolServer cfg@ProtocolClientConfig {qSize, networkConfig, smpServerVRange} msgQ disconnected = do
+  case chooseTransportHost networkConfig (host protocolServer) of
+    Right useHost ->
+      (atomically (mkProtocolClient useHost) >>= runClient useTransport useHost)
+        `catch` \(e :: IOException) -> pure . Left $ PCEIOError e
+    Left e -> pure $ Left e
  where
-    mkProtocolClient :: STM (ProtocolClient msg)
-    mkProtocolClient = do
+    NetworkConfig {tcpConnectTimeout, tcpTimeout, smpPingInterval} = networkConfig
+    mkProtocolClient :: TransportHost -> STM (PClient msg)
+    mkProtocolClient transportHost = do
      connected <- newTVar False
      clientCorrId <- newTVar 0
      sentCommands <- TM.empty
      sndQ <- newTBQueue qSize
      rcvQ <- newTBQueue qSize
      return
-        ProtocolClient
-          { action = undefined,
-            sessionId = undefined,
-            connected,
+        PClient
+          { connected,
            protocolServer,
+            transportHost,
            tcpTimeout,
            clientCorrId,
            sentCommands,
@@ -156,16 +268,17 @@ getProtocolClient protocolServer cfg@ProtocolClientConfig {qSize, tcpTimeout, tc
            msgQ
          }

-    runClient :: (ServiceName, ATransport) -> ProtocolClient msg -> IO (Either ProtocolClientError (ProtocolClient msg))
-    runClient (port', ATransport t) c = do
-      thVar <- newEmptyTMVarIO
+    runClient :: (ServiceName, ATransport) -> TransportHost -> PClient msg -> IO (Either ProtocolClientError (ProtocolClient msg))
+    runClient (port', ATransport t) useHost c = do
+      cVar <- newEmptyTMVarIO
+      let tcConfig = transportClientConfig networkConfig
      action <-
        async $
-          runTransportClient (host protocolServer) port' (Just $ keyHash protocolServer) tcpKeepAlive (client t c thVar)
-            `finally` atomically (putTMVar thVar $ Left PCENetworkError)
-      th_ <- tcpTimeout `timeout` atomically (takeTMVar thVar)
-      pure $ case th_ of
-        Just (Right THandle {sessionId}) -> Right c {action, sessionId}
+          runTransportClient tcConfig useHost port' (Just $ keyHash protocolServer) (client t c cVar)
+            `finally` atomically (putTMVar cVar $ Left PCENetworkError)
+      c_ <- tcpConnectTimeout `timeout` atomically (takeTMVar cVar)
+      pure $ case c_ of
+        Just (Right c') -> Right c' {action = Just action}
        Just (Left e) -> Left e
        Nothing -> Left PCENetworkError

@@ -175,38 +288,40 @@ getProtocolClient protocolServer cfg@ProtocolClientConfig {qSize, tcpTimeout, tc
      "80" -> ("80", transport @WS)
      p -> (p, transport @TLS)

-    client :: forall c. Transport c => TProxy c -> ProtocolClient msg -> TMVar (Either ProtocolClientError (THandle c)) -> c -> IO ()
-    client _ c thVar h =
-      runExceptT (protocolClientHandshake @msg h $ keyHash protocolServer) >>= \case
-        Left e -> atomically . putTMVar thVar . Left $ PCETransportError e
-        Right th@THandle {sessionId} -> do
+    client :: forall c. Transport c => TProxy c -> PClient msg -> TMVar (Either ProtocolClientError (ProtocolClient msg)) -> c -> IO ()
+    client _ c cVar h =
+      runExceptT (protocolClientHandshake @msg h (keyHash protocolServer) smpServerVRange) >>= \case
+        Left e -> atomically . putTMVar cVar . Left $ PCETransportError e
+        Right th@THandle {sessionId, thVersion} -> do
+          sessionTs <- getCurrentTime
+          let c' = ProtocolClient {action = Nothing, client_ = c, sessionId, thVersion, sessionTs}
          atomically $ do
            writeTVar (connected c) True
-            putTMVar thVar $ Right th
-          let c' = c {sessionId} :: ProtocolClient msg
-          -- TODO remove ping if 0 is passed (or Nothing?)
-          raceAny_ [send c' th, process c', receive c' th, ping c']
-            `finally` disconnected
+            putTMVar cVar $ Right c'
+          raceAny_ ([send c' th, process c', receive c' th] <> [ping c' | smpPingInterval > 0])
+            `finally` disconnected c'

    send :: Transport c => ProtocolClient msg -> THandle c -> IO ()
-    send ProtocolClient {sndQ} h = forever $ atomically (readTBQueue sndQ) >>= tPut h
+    send ProtocolClient {client_ = PClient {sndQ}} h = forever $ atomically (readTBQueue sndQ) >>= tPut h

    receive :: Transport c => ProtocolClient msg -> THandle c -> IO ()
-    receive ProtocolClient {rcvQ} h = forever $ tGet h >>= atomically . writeTBQueue rcvQ
+    receive ProtocolClient {client_ = PClient {rcvQ}} h = forever $ tGet h >>= atomically . writeTBQueue rcvQ

    ping :: ProtocolClient msg -> IO ()
    ping c = forever $ do
-      threadDelay smpPing
+      threadDelay smpPingInterval
      runExceptT $ sendProtocolCommand c Nothing "" protocolPing

    process :: ProtocolClient msg -> IO ()
-    process ProtocolClient {sessionId, rcvQ, sentCommands} = forever $ do
-      (_, _, (corrId, qId, respOrErr)) <- atomically $ readTBQueue rcvQ
+    process c = forever $ atomically (readTBQueue $ rcvQ $ client_ c) >>= mapM_ (processMsg c)
+
+    processMsg :: ProtocolClient msg -> SignedTransmission msg -> IO ()
+    processMsg c@ProtocolClient {client_ = PClient {sentCommands}} (_, _, (corrId, qId, respOrErr)) =
      if B.null $ bs corrId
-        then sendMsg qId respOrErr
+        then sendMsg respOrErr
        else do
          atomically (TM.lookup corrId sentCommands) >>= \case
-            Nothing -> sendMsg qId respOrErr
+            Nothing -> sendMsg respOrErr
            Just Request {queueId, responseVar} -> atomically $ do
              TM.delete corrId sentCommands
              putTMVar responseVar $
@@ -216,17 +331,16 @@ getProtocolClient protocolServer cfg@ProtocolClientConfig {qSize, tcpTimeout, tc
                    Right r -> case protocolError r of
                      Just e -> Left $ PCEProtocolError e
                      _ -> Right r
-                  else Left PCEUnexpectedResponse
+                  else Left . PCEUnexpectedResponse $ bshow respOrErr
      where
-        sendMsg :: QueueId -> Either ErrorType msg -> IO ()
-        sendMsg qId = \case
-          Right cmd -> atomically $ mapM_ (`writeTBQueue` (protocolServer, sessionId, qId, cmd)) msgQ
-          -- TODO send everything else to errQ and log in agent
-          _ -> return ()
+        sendMsg :: Either ErrorType msg -> IO ()
+        sendMsg = \case
+          Right msg -> atomically $ mapM_ (`writeTBQueue` serverTransmission c qId msg) msgQ
+          Left e -> putStrLn $ "SMP client error: " <> show e

 -- | Disconnects client from the server and terminates client threads.
 closeProtocolClient :: ProtocolClient msg -> IO ()
-closeProtocolClient = uninterruptibleCancel . action
+closeProtocolClient = mapM_ uninterruptibleCancel . action

 -- | SMP client error type.
 data ProtocolClientError
@@ -240,13 +354,15 @@ data ProtocolClientError
    -- e.g. server should respond `IDS` or `ERR` to `NEW` command,
    -- other responses would result in this error.
    -- Forwarded to the agent client as `ERR BROKER UNEXPECTED`.
-    PCEUnexpectedResponse
+    PCEUnexpectedResponse ByteString
  | -- | Used for TCP connection and command response timeouts.
    -- Forwarded to the agent client as `ERR BROKER TIMEOUT`.
    PCEResponseTimeout
  | -- | Failure to establish TCP connection.
    -- Forwarded to the agent client as `ERR BROKER NETWORK`.
    PCENetworkError
+  | -- | No host compatible with network configuration
+    PCEIncompatibleHost
  | -- | TCP transport handshake or some other transport error.
    -- Forwarded to the agent client as `ERR BROKER TRANSPORT e`.
    PCETransportError TransportError
@@ -264,22 +380,50 @@ createSMPQueue ::
  RcvPrivateSignKey ->
  RcvPublicVerifyKey ->
  RcvPublicDhKey ->
+  Maybe BasicAuth ->
  ExceptT ProtocolClientError IO QueueIdsKeys
-createSMPQueue c rpKey rKey dhKey =
-  sendSMPCommand c (Just rpKey) "" (NEW rKey dhKey) >>= \case
+createSMPQueue c rpKey rKey dhKey auth =
+  sendSMPCommand c (Just rpKey) "" (NEW rKey dhKey auth) >>= \case
    IDS qik -> pure qik
-    _ -> throwE PCEUnexpectedResponse
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 -- | Subscribe to the SMP queue.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#subscribe-to-queue
 subscribeSMPQueue :: SMPClient -> RcvPrivateSignKey -> RecipientId -> ExceptT ProtocolClientError IO ()
-subscribeSMPQueue c@ProtocolClient {protocolServer, sessionId, msgQ} rpKey rId =
+subscribeSMPQueue c rpKey rId =
  sendSMPCommand c (Just rpKey) rId SUB >>= \case
    OK -> return ()
-    cmd@MSG {} ->
-      lift . atomically $ mapM_ (`writeTBQueue` (protocolServer, sessionId, rId, cmd)) msgQ
-    _ -> throwE PCEUnexpectedResponse
+    cmd@MSG {} -> liftIO $ writeSMPMessage c rId cmd
+    r -> throwE . PCEUnexpectedResponse $ bshow r
+
+-- | Subscribe to multiple SMP queues batching commands if supported.
+subscribeSMPQueues :: SMPClient -> NonEmpty (RcvPrivateSignKey, RecipientId) -> IO (NonEmpty (Either ProtocolClientError ()))
+subscribeSMPQueues c qs = sendProtocolCommands c cs >>= mapM response . L.zip qs
+  where
+    cs = L.map (\(rpKey, rId) -> (Just rpKey, rId, Cmd SRecipient SUB)) qs
+    response ((_, rId), r) = case r of
+      Right OK -> pure $ Right ()
+      Right cmd@MSG {} -> writeSMPMessage c rId cmd $> Right ()
+      Right r' -> pure . Left . PCEUnexpectedResponse $ bshow r'
+      Left e -> pure $ Left e
+
+writeSMPMessage :: SMPClient -> RecipientId -> BrokerMsg -> IO ()
+writeSMPMessage c rId msg = atomically $ mapM_ (`writeTBQueue` serverTransmission c rId msg) (msgQ $ client_ c)
+
+serverTransmission :: ProtocolClient msg -> RecipientId -> msg -> ServerTransmission msg
+serverTransmission ProtocolClient {thVersion, sessionId, client_ = PClient {protocolServer}} entityId message =
+  (protocolServer, thVersion, sessionId, entityId, message)
+
+-- | Get message from SMP queue. The server returns ERR PROHIBITED if a client uses SUB and GET via the same transport connection for the same queue
+--
+-- https://github.covm/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#receive-a-message-from-the-queue
+getSMPMessage :: SMPClient -> RcvPrivateSignKey -> RecipientId -> ExceptT ProtocolClientError IO (Maybe RcvMessage)
+getSMPMessage c rpKey rId =
+  sendSMPCommand c (Just rpKey) rId GET >>= \case
+    OK -> pure Nothing
+    cmd@(MSG msg) -> liftIO (writeSMPMessage c rId cmd) $> Just msg
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 -- | Subscribe to the SMP queue notifications.
 --
@@ -296,31 +440,56 @@ secureSMPQueue c rpKey rId senderKey = okSMPCommand (KEY senderKey) c rpKey rId
 -- | Enable notifications for the queue for push notifications server.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#enable-notifications-command
-enableSMPQueueNotifications :: SMPClient -> RcvPrivateSignKey -> RecipientId -> NtfPublicVerifyKey -> ExceptT ProtocolClientError IO NotifierId
-enableSMPQueueNotifications c rpKey rId notifierKey =
-  sendSMPCommand c (Just rpKey) rId (NKEY notifierKey) >>= \case
-    NID nId -> pure nId
-    _ -> throwE PCEUnexpectedResponse
+enableSMPQueueNotifications :: SMPClient -> RcvPrivateSignKey -> RecipientId -> NtfPublicVerifyKey -> RcvNtfPublicDhKey -> ExceptT ProtocolClientError IO (NotifierId, RcvNtfPublicDhKey)
+enableSMPQueueNotifications c rpKey rId notifierKey rcvNtfPublicDhKey =
+  sendSMPCommand c (Just rpKey) rId (NKEY notifierKey rcvNtfPublicDhKey) >>= \case
+    NID nId rcvNtfSrvPublicDhKey -> pure (nId, rcvNtfSrvPublicDhKey)
+    r -> throwE . PCEUnexpectedResponse $ bshow r
+
+-- | Enable notifications for the multiple queues for push notifications server.
+enableSMPQueuesNtfs :: SMPClient -> NonEmpty (RcvPrivateSignKey, RecipientId, NtfPublicVerifyKey, RcvNtfPublicDhKey) -> IO (NonEmpty (Either ProtocolClientError (NotifierId, RcvNtfPublicDhKey)))
+enableSMPQueuesNtfs c qs = L.map response <$> sendProtocolCommands c cs
+  where
+    cs = L.map (\(rpKey, rId, notifierKey, rcvNtfPublicDhKey) -> (Just rpKey, rId, Cmd SRecipient $ NKEY notifierKey rcvNtfPublicDhKey)) qs
+    response = \case
+      Right (NID nId rcvNtfSrvPublicDhKey) -> Right (nId, rcvNtfSrvPublicDhKey)
+      Right r -> Left . PCEUnexpectedResponse $ bshow r
+      Left e -> Left e
+
+-- | Disable notifications for the queue for push notifications server.
+--
+-- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#disable-notifications-command
+disableSMPQueueNotifications :: SMPClient -> RcvPrivateSignKey -> RecipientId -> ExceptT ProtocolClientError IO ()
+disableSMPQueueNotifications = okSMPCommand NDEL
+
+-- | Disable notifications for multiple queues for push notifications server.
+disableSMPQueuesNtfs :: SMPClient -> NonEmpty (RcvPrivateSignKey, RecipientId) -> IO (NonEmpty (Either ProtocolClientError ()))
+disableSMPQueuesNtfs c qs = L.map response <$> sendProtocolCommands c cs
+  where
+    cs = L.map (\(rpKey, rId) -> (Just rpKey, rId, Cmd SRecipient NDEL)) qs
+    response = \case
+      Right OK -> Right ()
+      Right r -> Left . PCEUnexpectedResponse $ bshow r
+      Left e -> Left e

 -- | Send SMP message.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#send-message
-sendSMPMessage :: SMPClient -> Maybe SndPrivateSignKey -> SenderId -> MsgBody -> ExceptT ProtocolClientError IO ()
-sendSMPMessage c spKey sId msg =
-  sendSMPCommand c spKey sId (SEND msg) >>= \case
+sendSMPMessage :: SMPClient -> Maybe SndPrivateSignKey -> SenderId -> MsgFlags -> MsgBody -> ExceptT ProtocolClientError IO ()
+sendSMPMessage c spKey sId flags msg =
+  sendSMPCommand c spKey sId (SEND flags msg) >>= \case
    OK -> pure ()
-    _ -> throwE PCEUnexpectedResponse
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 -- | Acknowledge message delivery (server deletes the message).
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#acknowledge-message-delivery
-ackSMPMessage :: SMPClient -> RcvPrivateSignKey -> QueueId -> ExceptT ProtocolClientError IO ()
-ackSMPMessage c@ProtocolClient {protocolServer, sessionId, msgQ} rpKey rId =
-  sendSMPCommand c (Just rpKey) rId ACK >>= \case
+ackSMPMessage :: SMPClient -> RcvPrivateSignKey -> QueueId -> MsgId -> ExceptT ProtocolClientError IO ()
+ackSMPMessage c rpKey rId msgId =
+  sendSMPCommand c (Just rpKey) rId (ACK msgId) >>= \case
    OK -> return ()
-    cmd@MSG {} ->
-      lift . atomically $ mapM_ (`writeTBQueue` (protocolServer, sessionId, rId, cmd)) msgQ
-    _ -> throwE PCEUnexpectedResponse
+    cmd@MSG {} -> liftIO $ writeSMPMessage c rId cmd
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 -- | Irreversibly suspend SMP queue.
 -- The existing messages from the queue will still be delivered.
@@ -339,43 +508,50 @@ okSMPCommand :: PartyI p => Command p -> SMPClient -> C.APrivateSignKey -> Queue
 okSMPCommand cmd c pKey qId =
  sendSMPCommand c (Just pKey) qId cmd >>= \case
    OK -> return ()
-    _ -> throwE PCEUnexpectedResponse
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 -- | Send SMP command
 sendSMPCommand :: PartyI p => SMPClient -> Maybe C.APrivateSignKey -> QueueId -> Command p -> ExceptT ProtocolClientError IO BrokerMsg
 sendSMPCommand c pKey qId cmd = sendProtocolCommand c pKey qId (Cmd sParty cmd)

-- | Send Protocol command
-sendProtocolCommand :: forall msg. ProtocolEncoding (ProtocolCommand msg) => ProtocolClient msg -> Maybe C.APrivateSignKey -> QueueId -> ProtocolCommand msg -> ExceptT ProtocolClientError IO msg
-sendProtocolCommand ProtocolClient {sndQ, sentCommands, clientCorrId, sessionId, tcpTimeout} pKey qId cmd = do
-  corrId <- lift_ getNextCorrId
-  t <- signTransmission $ encodeTransmission sessionId (corrId, qId, cmd)
-  ExceptT $ sendRecv corrId t
+-- | Send multiple commands with batching and collect responses
+sendProtocolCommands :: forall msg. ProtocolEncoding (ProtoCommand msg) => ProtocolClient msg -> NonEmpty (ClientCommand msg) -> IO (NonEmpty (Either ProtocolClientError msg))
+sendProtocolCommands c@ProtocolClient {client_ = PClient {sndQ, tcpTimeout}} cs = do
+  ts <- mapM (runExceptT . mkTransmission c) cs
+  mapM_ (atomically . writeTBQueue sndQ . L.map fst) . L.nonEmpty . rights $ L.toList ts
+  forConcurrently ts $ \case
+    Right (_, r) -> withTimeout . atomically $ takeTMVar r
+    Left e -> pure $ Left e
  where
-    lift_ :: STM a -> ExceptT ProtocolClientError IO a
-    lift_ action = ExceptT $ Right <$> atomically action
+    withTimeout a = fromMaybe (Left PCEResponseTimeout) <$> timeout tcpTimeout a

+-- | Send Protocol command
+sendProtocolCommand :: forall msg. ProtocolEncoding (ProtoCommand msg) => ProtocolClient msg -> Maybe C.APrivateSignKey -> QueueId -> ProtoCommand msg -> ExceptT ProtocolClientError IO msg
+sendProtocolCommand c@ProtocolClient {client_ = PClient {sndQ, tcpTimeout}} pKey qId cmd = do
+  (t, r) <- mkTransmission c (pKey, qId, cmd)
+  ExceptT $ sendRecv t r
+  where
+    -- two separate "atomically" needed to avoid blocking
+    sendRecv :: SentRawTransmission -> TMVar (Response msg) -> IO (Response msg)
+    sendRecv t r = atomically (writeTBQueue sndQ [t]) >> withTimeout (atomically $ takeTMVar r)
+      where
+        withTimeout a = fromMaybe (Left PCEResponseTimeout) <$> timeout tcpTimeout a
+
+mkTransmission :: forall msg. ProtocolEncoding (ProtoCommand msg) => ProtocolClient msg -> ClientCommand msg -> ExceptT ProtocolClientError IO (SentRawTransmission, TMVar (Response msg))
+mkTransmission ProtocolClient {sessionId, thVersion, client_ = PClient {clientCorrId, sentCommands}} (pKey, qId, cmd) = do
+  corrId <- liftIO $ atomically getNextCorrId
+  let t = signTransmission $ encodeTransmission thVersion sessionId (corrId, qId, cmd)
+  r <- liftIO . atomically $ mkRequest corrId
+  pure (t, r)
+  where
    getNextCorrId :: STM CorrId
    getNextCorrId = do
      i <- stateTVar clientCorrId $ \i -> (i, i + 1)
      pure . CorrId $ bshow i
-
-    signTransmission :: ByteString -> ExceptT ProtocolClientError IO SentRawTransmission
-    signTransmission t = case pKey of
-      Nothing -> return (Nothing, t)
-      Just pk -> do
-        sig <- liftError PCESignatureError $ C.sign pk t
-        return (Just sig, t)
-
-    -- two separate "atomically" needed to avoid blocking
-    sendRecv :: CorrId -> SentRawTransmission -> IO (Response msg)
-    sendRecv corrId t = atomically (send corrId t) >>= withTimeout . atomically . takeTMVar
-      where
-        withTimeout a = fromMaybe (Left PCEResponseTimeout) <$> timeout tcpTimeout a
-
-    send :: CorrId -> SentRawTransmission -> STM (TMVar (Response msg))
-    send corrId t = do
+    signTransmission :: ByteString -> SentRawTransmission
+    signTransmission t = ((`C.sign` t) <$> pKey, t)
+    mkRequest :: CorrId -> STM (TMVar (Response msg))
+    mkRequest corrId = do
      r <- newEmptyTMVar
      TM.insert corrId (Request qId r) sentCommands
-      writeTBQueue sndQ t
-      return r
+      pure r
@@ -5,6 +5,7 @@
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TypeApplications #-}
 {-# OPTIONS_GHC -fno-warn-orphans #-}

 module Simplex.Messaging.Client.Agent where
@@ -25,10 +26,12 @@ import Numeric.Natural
 import Simplex.Messaging.Agent.RetryInterval
 import Simplex.Messaging.Client
 import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Protocol (BrokerMsg, ProtocolServer (..), QueueId, SMPServer)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
-import Simplex.Messaging.Util (catchAll_, tryE, whenM, ($>>=))
+import Simplex.Messaging.Transport
+import Simplex.Messaging.Util (catchAll_, tryE, unlessM, ($>>=))
 import System.Timeout (timeout)
 import UnliftIO (async, forConcurrently_)
 import UnliftIO.Exception (Exception)
@@ -45,7 +48,7 @@ data SMPClientAgentEvent
  | CASubError SMPServer SMPSub ProtocolClientError

 data SMPSubParty = SPRecipient | SPNotifier
-  deriving (Eq, Ord)
+  deriving (Eq, Ord, Show)

 type SMPSub = (SMPSubParty, QueueId)

@@ -61,7 +64,7 @@ data SMPClientAgentConfig = SMPClientAgentConfig
 defaultSMPClientAgentConfig :: SMPClientAgentConfig
 defaultSMPClientAgentConfig =
  SMPClientAgentConfig
-    { smpCfg = defaultClientConfig,
+    { smpCfg = defaultClientConfig {defaultTransport = ("5223", transport @TLS)},
      reconnectInterval =
        RetryInterval
          { initialInterval = second,
@@ -123,8 +126,8 @@ getSMPServerClient' ca@SMPClientAgent {agentCfg, smpClients, msgQ} srv =

    waitForSMPClient :: SMPClientVar -> ExceptT ProtocolClientError IO SMPClient
    waitForSMPClient smpVar = do
-      let ProtocolClientConfig {tcpTimeout} = smpCfg agentCfg
-      smpClient_ <- liftIO $ tcpTimeout `timeout` atomically (readTMVar smpVar)
+      let ProtocolClientConfig {networkConfig = NetworkConfig {tcpConnectTimeout}} = smpCfg agentCfg
+      smpClient_ <- liftIO $ tcpConnectTimeout `timeout` atomically (readTMVar smpVar)
      liftEither $ case smpClient_ of
        Just (Right smpClient) -> Right smpClient
        Just (Left e) -> Left e
@@ -159,8 +162,8 @@ getSMPServerClient' ca@SMPClientAgent {agentCfg, smpClients, msgQ} srv =
    connectClient :: ExceptT ProtocolClientError IO SMPClient
    connectClient = ExceptT $ getProtocolClient srv (smpCfg agentCfg) (Just msgQ) clientDisconnected

-    clientDisconnected :: IO ()
-    clientDisconnected = do
+    clientDisconnected :: SMPClient -> IO ()
+    clientDisconnected _ = do
      removeClientAndSubs >>= (`forM_` serverDown)
      logInfo . decodeUtf8 $ "Agent disconnected from " <> showServer srv

@@ -201,7 +204,7 @@ getSMPServerClient' ca@SMPClientAgent {agentCfg, smpClients, msgQ} srv =
        notify $ CAReconnected srv
        cs <- atomically $ mapM readTVar =<< TM.lookup srv (pendingSrvSubs ca)
        forConcurrently_ (maybe [] M.assocs cs) $ \sub@(s, _) ->
-          whenM (atomically $ hasSub (srvSubs ca) srv s) $
+          unlessM (atomically $ hasSub (srvSubs ca) srv s) $
            subscribe_ smp sub `catchE` handleError s
      where
        subscribe_ :: SMPClient -> (SMPSub, C.APrivateSignKey) -> ExceptT ProtocolClientError IO ()
@@ -262,7 +265,7 @@ subscribeQueue ca srv sub = do

 showServer :: SMPServer -> ByteString
 showServer ProtocolServer {host, port} =
-  B.pack $ host <> if null port then "" else ':' : port
+  strEncode host <> B.pack (if null port then "" else ':' : port)

 smpSubscribe :: SMPClient -> (SMPSub, C.APrivateSignKey) -> ExceptT ProtocolClientError IO ()
 smpSubscribe smp ((party, queueId), privKey) = subscribe_ smp privKey queueId
@@ -8,6 +8,7 @@
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE StandaloneDeriving #-}
@@ -66,7 +67,9 @@ module Simplex.Messaging.Crypto

    -- * key encoding/decoding
    encodePubKey,
+    decodePubKey,
    encodePrivKey,
+    decodePrivKey,
    pubKeyBytes,

    -- * sign/verify
@@ -101,6 +104,7 @@ module Simplex.Messaging.Crypto
    -- * NaCl crypto_box
    CbNonce (unCbNonce),
    cbEncrypt,
+    cbEncryptMaxLenBS,
    cbDecrypt,
    cbNonce,
    randomCbNonce,
@@ -118,6 +122,13 @@ module Simplex.Messaging.Crypto

    -- * Cryptography error type
    CryptoError (..),
+
+    -- * Limited size ByteStrings
+    MaxLenBS,
+    pattern MaxLenBS,
+    maxLenBS,
+    unsafeMaxLenBS,
+    appendMaxLenBS,
  )
 where

@@ -153,11 +164,11 @@ import Data.Constraint (Dict (..))
 import Data.Kind (Constraint, Type)
 import Data.String
 import Data.Type.Equality
-import Data.Typeable (Typeable)
+import Data.Typeable (Proxy (Proxy), Typeable)
 import Data.X509
 import Database.SQLite.Simple.FromField (FromField (..))
 import Database.SQLite.Simple.ToField (ToField (..))
-import GHC.TypeLits (ErrorMessage (..), TypeError)
+import GHC.TypeLits (ErrorMessage (..), KnownNat, Nat, TypeError, natVal, type (+))
 import Network.Transport.Internal (decodeWord16, encodeWord16)
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
@@ -250,6 +261,12 @@ deriving instance Eq (PrivateKey a)

 deriving instance Show (PrivateKey a)

+instance StrEncoding (PrivateKey X25519) where
+  strEncode = strEncode . encodePrivKey
+  {-# INLINE strEncode #-}
+  strDecode = decodePrivKey
+  {-# INLINE strDecode #-}
+
 data APrivateKey
  = forall a.
    AlgorithmI a =>
@@ -296,6 +313,12 @@ instance Encoding APrivateSignKey where
  smpDecode = decodePrivKey
  {-# INLINE smpDecode #-}

+instance StrEncoding APrivateSignKey where
+  strEncode = strEncode . encodePrivKey
+  {-# INLINE strEncode #-}
+  strDecode = decodePrivKey
+  {-# INLINE strDecode #-}
+
 data APublicVerifyKey
  = forall a.
    (AlgorithmI a, SignatureAlgorithm a) =>
@@ -670,6 +693,8 @@ data CryptoError
  | -- | message is larger that allowed padded length minus 2 (to prepend message length)
    -- (or required un-padded length is larger than the message length)
    CryptoLargeMsgError
+  | -- | padded message is shorter than 2 bytes
+    CryptoInvalidMsgError
  | -- | failure parsing message header
    CryptoHeaderError String
  | -- | no sending chain key in ratchet state
@@ -678,7 +703,9 @@ data CryptoError
    CERatchetHeader
  | -- | too many skipped messages
    CERatchetTooManySkipped
-  | -- | duplicate message number (or, possibly, skipped message that failed to decrypt?)
+  | -- | earlier message number (or, possibly, skipped message that failed to decrypt?)
+    CERatchetEarlierMessage
+  | -- | duplicate message number
    CERatchetDuplicateMessage
  deriving (Eq, Show, Exception)

@@ -779,9 +806,12 @@ decryptAEAD aesKey ivBytes ad msg (AuthTag authTag) = do
  aead <- initAEAD @AES256 aesKey ivBytes
  liftEither . unPad =<< maybeError AESDecryptError (AES.aeadSimpleDecrypt aead ad msg authTag)

+maxMsgLen :: Int
+maxMsgLen = 2 ^ (16 :: Int) - 3
+
 pad :: ByteString -> Int -> Either CryptoError ByteString
 pad msg paddedLen
-  | padLen >= 0 = Right $ encodeWord16 (fromIntegral len) <> msg <> B.replicate padLen '#'
+  | len <= maxMsgLen && padLen >= 0 = Right $ encodeWord16 (fromIntegral len) <> msg <> B.replicate padLen '#'
  | otherwise = Left CryptoLargeMsgError
  where
    len = B.length msg
@@ -789,12 +819,47 @@ pad msg paddedLen

 unPad :: ByteString -> Either CryptoError ByteString
 unPad padded
-  | B.length rest >= len = Right $ B.take len rest
-  | otherwise = Left CryptoLargeMsgError
+  | B.length lenWrd == 2 && B.length rest >= len = Right $ B.take len rest
+  | otherwise = Left CryptoInvalidMsgError
  where
    (lenWrd, rest) = B.splitAt 2 padded
    len = fromIntegral $ decodeWord16 lenWrd

+newtype MaxLenBS (i :: Nat) = MLBS {unMaxLenBS :: ByteString}
+
+pattern MaxLenBS :: ByteString -> MaxLenBS i
+pattern MaxLenBS s <- MLBS s
+
+{-# COMPLETE MaxLenBS #-}
+
+instance KnownNat i => Encoding (MaxLenBS i) where
+  smpEncode (MLBS s) = smpEncode s
+  smpP = first show . maxLenBS <$?> smpP
+
+instance KnownNat i => StrEncoding (MaxLenBS i) where
+  strEncode (MLBS s) = strEncode s
+  strP = first show . maxLenBS <$?> strP
+
+maxLenBS :: forall i. KnownNat i => ByteString -> Either CryptoError (MaxLenBS i)
+maxLenBS s
+  | B.length s > maxLength @i = Left CryptoLargeMsgError
+  | otherwise = Right $ MLBS s
+
+unsafeMaxLenBS :: forall i. KnownNat i => ByteString -> MaxLenBS i
+unsafeMaxLenBS = MLBS
+
+padMaxLenBS :: forall i. KnownNat i => MaxLenBS i -> MaxLenBS (i + 2)
+padMaxLenBS (MLBS msg) = MLBS $ encodeWord16 (fromIntegral len) <> msg <> B.replicate padLen '#'
+  where
+    len = B.length msg
+    padLen = maxLength @i - len
+
+appendMaxLenBS :: (KnownNat i, KnownNat j) => MaxLenBS i -> MaxLenBS j -> MaxLenBS (i + j)
+appendMaxLenBS (MLBS s1) (MLBS s2) = MLBS $ s1 <> s2
+
+maxLength :: forall i. KnownNat i => Int
+maxLength = fromIntegral (natVal $ Proxy @i)
+
 initAEAD :: forall c. AES.BlockCipher c => Key -> IV -> ExceptT CryptoError IO (AES.AEAD c)
 initAEAD (Key aesKey) (IV ivBytes) = do
  iv <- makeIV @c ivBytes
@@ -825,12 +890,12 @@ cryptoFailable = liftEither . first AESCipherError . CE.eitherCryptoError
 -- | Message signing.
 --
 -- Used by SMP clients to sign SMP commands and by SMP agents to sign messages.
-sign' :: SignatureAlgorithm a => PrivateKey a -> ByteString -> ExceptT CryptoError IO (Signature a)
-sign' (PrivateKeyEd25519 pk k) msg = pure . SignatureEd25519 $ Ed25519.sign pk k msg
-sign' (PrivateKeyEd448 pk k) msg = pure . SignatureEd448 $ Ed448.sign pk k msg
+sign' :: SignatureAlgorithm a => PrivateKey a -> ByteString -> Signature a
+sign' (PrivateKeyEd25519 pk k) msg = SignatureEd25519 $ Ed25519.sign pk k msg
+sign' (PrivateKeyEd448 pk k) msg = SignatureEd448 $ Ed448.sign pk k msg

-sign :: APrivateSignKey -> ByteString -> ExceptT CryptoError IO ASignature
-sign (APrivateSignKey a k) = fmap (ASignature a) . sign' k
+sign :: APrivateSignKey -> ByteString -> ASignature
+sign (APrivateSignKey a k) = ASignature a . sign' k

 -- | Signature verification.
 --
@@ -850,12 +915,17 @@ dh' (PublicKeyX448 k) (PrivateKeyX448 pk _) = DhSecretX448 $ X448.dh k pk

 -- | NaCl @crypto_box@ encrypt with a shared DH secret and 192-bit nonce.
 cbEncrypt :: DhSecret X25519 -> CbNonce -> ByteString -> Int -> Either CryptoError ByteString
-cbEncrypt secret (CbNonce nonce) msg paddedLen = cryptoBox <$> pad msg paddedLen
+cbEncrypt secret (CbNonce nonce) msg paddedLen = cryptoBox secret nonce <$> pad msg paddedLen
+
+-- | NaCl @crypto_box@ encrypt with a shared DH secret and 192-bit nonce.
+cbEncryptMaxLenBS :: KnownNat i => DhSecret X25519 -> CbNonce -> MaxLenBS i -> ByteString
+cbEncryptMaxLenBS secret (CbNonce nonce) = cryptoBox secret nonce . unMaxLenBS . padMaxLenBS
+
+cryptoBox :: DhSecret 'X25519 -> ByteString -> ByteString -> ByteString
+cryptoBox secret nonce s = BA.convert tag <> c
  where
-    cryptoBox s = BA.convert tag <> c
-      where
-        (rs, c) = xSalsa20 secret nonce s
-        tag = Poly1305.auth rs c
+    (rs, c) = xSalsa20 secret nonce s
+    tag = Poly1305.auth rs c

 -- | NaCl @crypto_box@ decrypt with a shared DH secret and 192-bit nonce.
 cbDecrypt :: DhSecret X25519 -> CbNonce -> ByteString -> Either CryptoError ByteString
@@ -869,7 +939,7 @@ cbDecrypt secret (CbNonce nonce) packet
    tag = Poly1305.auth rs c

 newtype CbNonce = CbNonce {unCbNonce :: ByteString}
-  deriving (Show)
+  deriving (Eq, Show)

 instance StrEncoding CbNonce where
  strEncode (CbNonce s) = strEncode s
@@ -894,11 +964,7 @@ pseudoRandomCbNonce :: TVar ChaChaDRG -> STM CbNonce
 pseudoRandomCbNonce gVar = CbNonce <$> pseudoRandomBytes 24 gVar

 pseudoRandomBytes :: Int -> TVar ChaChaDRG -> STM ByteString
-pseudoRandomBytes n gVar = do
-  g <- readTVar gVar
-  let (bytes, g') = randomBytesGenerate n g
-  writeTVar gVar g'
-  return bytes
+pseudoRandomBytes n gVar = stateTVar gVar $ randomBytesGenerate n

 instance Encoding CbNonce where
  smpEncode = unCbNonce
@@ -41,11 +41,11 @@ import Simplex.Messaging.Parsers (blobFieldDecoder, parseE, parseE')
 import Simplex.Messaging.Util (tryE)
 import Simplex.Messaging.Version

-e2eEncryptVersion :: Version
-e2eEncryptVersion = 1
+currentE2EEncryptVersion :: Version
+currentE2EEncryptVersion = 2

-e2eEncryptVRange :: VersionRange
-e2eEncryptVRange = mkVersionRange 1 e2eEncryptVersion
+supportedE2EEncryptVRange :: VersionRange
+supportedE2EEncryptVRange = mkVersionRange 1 currentE2EEncryptVersion

 data E2ERatchetParams (a :: Algorithm)
  = E2ERatchetParams Version (PublicKey a) (PublicKey a)
@@ -96,20 +96,27 @@ data RatchetInitParams = RatchetInitParams
  deriving (Eq, Show)

 x3dhSnd :: DhAlgorithm a => PrivateKey a -> PrivateKey a -> E2ERatchetParams a -> RatchetInitParams
-x3dhSnd spk1 spk2 (E2ERatchetParams _ rk1 rk2) =
-  x3dh (publicKey spk1, rk1) (dh' rk1 spk2) (dh' rk2 spk1) (dh' rk2 spk2)
+x3dhSnd spk1 spk2 (E2ERatchetParams v rk1 rk2) =
+  x3dh v (publicKey spk1, rk1) (dh' rk1 spk2) (dh' rk2 spk1) (dh' rk2 spk2)

 x3dhRcv :: DhAlgorithm a => PrivateKey a -> PrivateKey a -> E2ERatchetParams a -> RatchetInitParams
-x3dhRcv rpk1 rpk2 (E2ERatchetParams _ sk1 sk2) =
-  x3dh (sk1, publicKey rpk1) (dh' sk2 rpk1) (dh' sk1 rpk2) (dh' sk2 rpk2)
+x3dhRcv rpk1 rpk2 (E2ERatchetParams v sk1 sk2) =
+  x3dh v (sk1, publicKey rpk1) (dh' sk2 rpk1) (dh' sk1 rpk2) (dh' sk2 rpk2)

-x3dh :: DhAlgorithm a => (PublicKey a, PublicKey a) -> DhSecret a -> DhSecret a -> DhSecret a -> RatchetInitParams
-x3dh (sk1, rk1) dh1 dh2 dh3 =
+x3dh :: DhAlgorithm a => Version -> (PublicKey a, PublicKey a) -> DhSecret a -> DhSecret a -> DhSecret a -> RatchetInitParams
+x3dh v (sk1, rk1) dh1 dh2 dh3 =
  RatchetInitParams {assocData, ratchetKey = RatchetKey sk, sndHK = Key hk, rcvNextHK = Key nhk}
  where
    assocData = Str $ pubKeyBytes sk1 <> pubKeyBytes rk1
-    (hk, rest) = B.splitAt 32 $ dhBytes' dh1 <> dhBytes' dh2 <> dhBytes' dh3
-    (nhk, sk) = B.splitAt 32 rest
+    dhs = dhBytes' dh1 <> dhBytes' dh2 <> dhBytes' dh3
+    (hk, nhk, sk)
+      -- for backwards compatibility with clients using agent version before 3.4.0
+      | v == 1 =
+        let (hk', rest) = B.splitAt 32 dhs
+         in uncurry (hk',,) $ B.splitAt 32 rest
+      | otherwise =
+        let salt = B.replicate 64 '\0'
+         in hkdf3 salt dhs "SimpleXX3DH"

 type RatchetX448 = Ratchet 'X448

@@ -210,12 +217,12 @@ instance FromField MessageKey where fromField = blobFieldDecoder smpDecode
 -- Please note that sPKey is not stored, and its public part together with random salt
 -- is sent to the recipient.
 initSndRatchet ::
-  forall a. (AlgorithmI a, DhAlgorithm a) => PublicKey a -> PrivateKey a -> RatchetInitParams -> Ratchet a
-initSndRatchet rcDHRr rcDHRs RatchetInitParams {assocData, ratchetKey, sndHK, rcvNextHK} = do
+  forall a. (AlgorithmI a, DhAlgorithm a) => VersionRange -> PublicKey a -> PrivateKey a -> RatchetInitParams -> Ratchet a
+initSndRatchet rcVersion rcDHRr rcDHRs RatchetInitParams {assocData, ratchetKey, sndHK, rcvNextHK} = do
  -- state.RK, state.CKs, state.NHKs = KDF_RK_HE(SK, DH(state.DHRs, state.DHRr))
  let (rcRK, rcCKs, rcNHKs) = rootKdf ratchetKey rcDHRr rcDHRs
   in Ratchet
-        { rcVersion = e2eEncryptVRange,
+        { rcVersion,
          rcAD = assocData,
          rcDHRs,
          rcRK,
@@ -233,10 +240,10 @@ initSndRatchet rcDHRr rcDHRs RatchetInitParams {assocData, ratchetKey, sndHK, rc
 -- Please note that the public part of rcDHRs was sent to the sender
 -- as part of the connection request and random salt was received from the sender.
 initRcvRatchet ::
-  forall a. (AlgorithmI a, DhAlgorithm a) => PrivateKey a -> RatchetInitParams -> Ratchet a
-initRcvRatchet rcDHRs RatchetInitParams {assocData, ratchetKey, sndHK, rcvNextHK} =
+  forall a. (AlgorithmI a, DhAlgorithm a) => VersionRange -> PrivateKey a -> RatchetInitParams -> Ratchet a
+initRcvRatchet rcVersion rcDHRs RatchetInitParams {assocData, ratchetKey, sndHK, rcvNextHK} =
  Ratchet
-    { rcVersion = e2eEncryptVRange,
+    { rcVersion,
      rcAD = assocData,
      rcDHRs,
      rcRK = ratchetKey,
@@ -416,7 +423,8 @@ rcDecrypt rc@Ratchet {rcRcv, rcAD = Str rcAD} rcMKSkipped msg' = do
    skipMessageKeys :: Word32 -> Ratchet a -> Either CryptoError (Ratchet a, SkippedMsgKeys)
    skipMessageKeys _ r@Ratchet {rcRcv = Nothing} = Right (r, M.empty)
    skipMessageKeys untilN r@Ratchet {rcRcv = Just rr@RcvRatchet {rcCKr, rcHKr}, rcNr}
-      | rcNr > untilN = Left CERatchetDuplicateMessage
+      | rcNr > untilN + 1 = Left CERatchetEarlierMessage
+      | rcNr == untilN + 1 = Left CERatchetDuplicateMessage
      | rcNr + maxSkip < untilN = Left CERatchetTooManySkipped
      | rcNr == untilN = Right (r, M.empty)
      | otherwise =
@@ -464,7 +472,6 @@ rcDecrypt rc@Ratchet {rcRcv, rcAD = Str rcAD} rcMKSkipped msg' = do
    decryptMessage :: MessageKey -> EncRatchetMessage -> ExceptT CryptoError IO (Either CryptoError ByteString)
    decryptMessage (MessageKey mk iv) EncRatchetMessage {emHeader, emBody, emAuthTag} =
      -- DECRYPT(mk, cipher-text, CONCAT(AD, enc_header))
-      -- TODO add associated data
      tryE $ decryptAEAD mk iv (rcAD <> emHeader) emBody emAuthTag

 rootKdf :: (AlgorithmI a, DhAlgorithm a) => RatchetKey -> PublicKey a -> PrivateKey a -> (RatchetKey, RatchetKey, Key)
@@ -13,6 +13,7 @@ module Simplex.Messaging.Encoding
    Large (..),
    smpEncodeList,
    smpListP,
+    lenEncode,
  )
 where

@@ -47,66 +48,100 @@ class Encoding a where

 instance Encoding Char where
  smpEncode = B.singleton
+  {-# INLINE smpEncode #-}
  smpP = A.anyChar
+  {-# INLINE smpP #-}
+
+instance Encoding Bool where
+  smpEncode = \case
+    True -> "T"
+    False -> "F"
+  {-# INLINE smpEncode #-}
+  smpP =
+    smpP >>= \case
+      'T' -> pure True
+      'F' -> pure False
+      _ -> fail "invalid Bool"
+  {-# INLINE smpP #-}

 instance Encoding Word16 where
  smpEncode = encodeWord16
+  {-# INLINE smpEncode #-}
  smpP = decodeWord16 <$> A.take 2
+  {-# INLINE smpP #-}

 instance Encoding Word32 where
  smpEncode = encodeWord32
+  {-# INLINE smpEncode #-}
  smpP = decodeWord32 <$> A.take 4
+  {-# INLINE smpP #-}

 instance Encoding Int64 where
  smpEncode i = w32 (i `shiftR` 32) <> w32 i
+  {-# INLINE smpEncode #-}
  smpP = do
    l <- w32P
    r <- w32P
    pure $ (l `shiftL` 32) .|. r
+  {-# INLINE smpP #-}

 w32 :: Int64 -> ByteString
 w32 = smpEncode @Word32 . fromIntegral
+{-# INLINE w32 #-}

 w32P :: Parser Int64
 w32P = fromIntegral <$> smpP @Word32
+{-# INLINE w32P #-}

 -- ByteStrings are assumed no longer than 255 bytes
 instance Encoding ByteString where
  smpEncode s = B.cons (lenEncode $ B.length s) s
+  {-# INLINE smpEncode #-}
  smpP = A.take =<< lenP
+  {-# INLINE smpP #-}

 lenEncode :: Int -> Char
 lenEncode = w2c . fromIntegral
+{-# INLINE lenEncode #-}

 lenP :: Parser Int
 lenP = fromIntegral . c2w <$> A.anyChar
+{-# INLINE lenP #-}

 instance Encoding a => Encoding (Maybe a) where
  smpEncode s = maybe "0" (("1" <>) . smpEncode) s
+  {-# INLINE smpEncode #-}
  smpP =
    smpP >>= \case
      '0' -> pure Nothing
      '1' -> Just <$> smpP
      _ -> fail "invalid Maybe tag"
+  {-# INLINE smpP #-}

 newtype Tail = Tail {unTail :: ByteString}

 instance Encoding Tail where
  smpEncode = unTail
+  {-# INLINE smpEncode #-}
  smpP = Tail <$> A.takeByteString
+  {-# INLINE smpP #-}

 -- newtype for encoding/decoding ByteStrings over 255 bytes with 2-bytes length prefix
 newtype Large = Large {unLarge :: ByteString}

 instance Encoding Large where
  smpEncode (Large s) = smpEncode @Word16 (fromIntegral $ B.length s) <> s
+  {-# INLINE smpEncode #-}
  smpP = do
    len <- fromIntegral <$> smpP @Word16
    Large <$> A.take len
+  {-# INLINE smpP #-}

 instance Encoding SystemTime where
  smpEncode = smpEncode . systemSeconds
+  {-# INLINE smpEncode #-}
  smpP = MkSystemTime <$> smpP <*> pure 0
+  {-# INLINE smpP #-}

 -- lists encode/parse as a sequence of items prefixed with list length (as 1 byte)
 smpEncodeList :: Encoding a => [a] -> ByteString
@@ -117,7 +152,9 @@ smpListP = (`A.count` smpP) =<< lenP

 instance Encoding String where
  smpEncode = smpEncode . B.pack
+  {-# INLINE smpEncode #-}
  smpP = B.unpack <$> smpP
+  {-# INLINE smpP #-}

 instance Encoding a => Encoding (L.NonEmpty a) where
  smpEncode = smpEncodeList . L.toList
@@ -128,20 +165,42 @@ instance Encoding a => Encoding (L.NonEmpty a) where

 instance (Encoding a, Encoding b) => Encoding (a, b) where
  smpEncode (a, b) = smpEncode a <> smpEncode b
+  {-# INLINE smpEncode #-}
  smpP = (,) <$> smpP <*> smpP
+  {-# INLINE smpP #-}

 instance (Encoding a, Encoding b, Encoding c) => Encoding (a, b, c) where
  smpEncode (a, b, c) = smpEncode a <> smpEncode b <> smpEncode c
+  {-# INLINE smpEncode #-}
  smpP = (,,) <$> smpP <*> smpP <*> smpP
+  {-# INLINE smpP #-}

 instance (Encoding a, Encoding b, Encoding c, Encoding d) => Encoding (a, b, c, d) where
  smpEncode (a, b, c, d) = smpEncode a <> smpEncode b <> smpEncode c <> smpEncode d
+  {-# INLINE smpEncode #-}
  smpP = (,,,) <$> smpP <*> smpP <*> smpP <*> smpP
+  {-# INLINE smpP #-}

 instance (Encoding a, Encoding b, Encoding c, Encoding d, Encoding e) => Encoding (a, b, c, d, e) where
  smpEncode (a, b, c, d, e) = smpEncode a <> smpEncode b <> smpEncode c <> smpEncode d <> smpEncode e
+  {-# INLINE smpEncode #-}
  smpP = (,,,,) <$> smpP <*> smpP <*> smpP <*> smpP <*> smpP
+  {-# INLINE smpP #-}

 instance (Encoding a, Encoding b, Encoding c, Encoding d, Encoding e, Encoding f) => Encoding (a, b, c, d, e, f) where
  smpEncode (a, b, c, d, e, f) = smpEncode a <> smpEncode b <> smpEncode c <> smpEncode d <> smpEncode e <> smpEncode f
+  {-# INLINE smpEncode #-}
  smpP = (,,,,,) <$> smpP <*> smpP <*> smpP <*> smpP <*> smpP <*> smpP
+  {-# INLINE smpP #-}
+
+instance (Encoding a, Encoding b, Encoding c, Encoding d, Encoding e, Encoding f, Encoding g) => Encoding (a, b, c, d, e, f, g) where
+  smpEncode (a, b, c, d, e, f, g) = smpEncode a <> smpEncode b <> smpEncode c <> smpEncode d <> smpEncode e <> smpEncode f <> smpEncode g
+  {-# INLINE smpEncode #-}
+  smpP = (,,,,,,) <$> smpP <*> smpP <*> smpP <*> smpP <*> smpP <*> smpP <*> smpP
+  {-# INLINE smpP #-}
+
+instance (Encoding a, Encoding b, Encoding c, Encoding d, Encoding e, Encoding f, Encoding g, Encoding h) => Encoding (a, b, c, d, e, f, g, h) where
+  smpEncode (a, b, c, d, e, f, g, h) = smpEncode a <> smpEncode b <> smpEncode c <> smpEncode d <> smpEncode e <> smpEncode f <> smpEncode g <> smpEncode h
+  {-# INLINE smpEncode #-}
+  smpP = (,,,,,,,) <$> smpP <*> smpP <*> smpP <*> smpP <*> smpP <*> smpP <*> smpP <*> smpP
+  {-# INLINE smpP #-}
@@ -6,6 +6,7 @@ module Simplex.Messaging.Encoding.String
    StrEncoding (..),
    Str (..),
    strP_,
+    _strP,
    strToJSON,
    strToJEncoding,
    strParseJSON,
@@ -26,10 +27,17 @@ import qualified Data.ByteString.Base64.URL as U
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import Data.Char (isAlphaNum)
+import Data.Int (Int64)
 import qualified Data.List.NonEmpty as L
+import Data.Set (Set)
+import qualified Data.Set as S
 import Data.Text (Text)
 import Data.Text.Encoding (decodeLatin1, encodeUtf8)
+import Data.Time.Clock (UTCTime)
+import Data.Time.Clock.System (SystemTime (..))
+import Data.Time.Format.ISO8601
 import Data.Word (Word16)
+import Simplex.Messaging.Encoding
 import Simplex.Messaging.Parsers (parseAll)
 import Simplex.Messaging.Util ((<$?>))

@@ -76,11 +84,47 @@ instance FromJSON Str where

 instance StrEncoding a => StrEncoding (Maybe a) where
  strEncode = maybe "" strEncode
+  {-# INLINE strEncode #-}
  strP = optional strP
+  {-# INLINE strP #-}

 instance StrEncoding Word16 where
  strEncode = B.pack . show
+  {-# INLINE strEncode #-}
  strP = A.decimal
+  {-# INLINE strP #-}
+
+instance StrEncoding Char where
+  strEncode = smpEncode
+  {-# INLINE strEncode #-}
+  strP = smpP
+  {-# INLINE strP #-}
+
+instance StrEncoding Bool where
+  strEncode = smpEncode
+  {-# INLINE strEncode #-}
+  strP = smpP
+  {-# INLINE strP #-}
+
+instance StrEncoding Int where
+  strEncode = B.pack . show
+  {-# INLINE strEncode #-}
+  strP = A.decimal
+  {-# INLINE strP #-}
+
+instance StrEncoding Int64 where
+  strEncode = B.pack . show
+  {-# INLINE strEncode #-}
+  strP = A.decimal
+  {-# INLINE strP #-}
+
+instance StrEncoding SystemTime where
+  strEncode = strEncode . systemSeconds
+  strP = MkSystemTime <$> strP <*> pure 0
+
+instance StrEncoding UTCTime where
+  strEncode = B.pack . iso8601Show
+  strP = maybe (Left "bad UTCTime") Right . iso8601ParseM . B.unpack <$?> A.takeTill (\c -> c == ' ' || c == '\n')

 -- lists encode/parse as comma-separated strings
 strEncodeList :: StrEncoding a => [a] -> ByteString
@@ -94,28 +138,43 @@ instance StrEncoding a => StrEncoding (L.NonEmpty a) where
  strEncode = strEncodeList . L.toList
  strP = L.fromList <$> listItem `A.sepBy1'` A.char ','

+instance (StrEncoding a, Ord a) => StrEncoding (Set a) where
+  strEncode = strEncodeList . S.toList
+  strP = S.fromList <$> listItem `A.sepBy'` A.char ','
+
 listItem :: StrEncoding a => Parser a
-listItem = parseAll strP <$?> A.takeTill (== ',')
+listItem = parseAll strP <$?> A.takeTill (\c -> c == ',' || c == ' ' || c == '\n')

 instance (StrEncoding a, StrEncoding b) => StrEncoding (a, b) where
  strEncode (a, b) = B.unwords [strEncode a, strEncode b]
+  {-# INLINE strEncode #-}
  strP = (,) <$> strP_ <*> strP
+  {-# INLINE strP #-}

 instance (StrEncoding a, StrEncoding b, StrEncoding c) => StrEncoding (a, b, c) where
  strEncode (a, b, c) = B.unwords [strEncode a, strEncode b, strEncode c]
+  {-# INLINE strEncode #-}
  strP = (,,) <$> strP_ <*> strP_ <*> strP
+  {-# INLINE strP #-}

 instance (StrEncoding a, StrEncoding b, StrEncoding c, StrEncoding d) => StrEncoding (a, b, c, d) where
  strEncode (a, b, c, d) = B.unwords [strEncode a, strEncode b, strEncode c, strEncode d]
+  {-# INLINE strEncode #-}
  strP = (,,,) <$> strP_ <*> strP_ <*> strP_ <*> strP
+  {-# INLINE strP #-}

 instance (StrEncoding a, StrEncoding b, StrEncoding c, StrEncoding d, StrEncoding e) => StrEncoding (a, b, c, d, e) where
  strEncode (a, b, c, d, e) = B.unwords [strEncode a, strEncode b, strEncode c, strEncode d, strEncode e]
+  {-# INLINE strEncode #-}
  strP = (,,,,) <$> strP_ <*> strP_ <*> strP_ <*> strP_ <*> strP
+  {-# INLINE strP #-}

 strP_ :: StrEncoding a => Parser a
 strP_ = strP <* A.space

+_strP :: StrEncoding a => Parser a
+_strP = A.space *> strP
+
 strToJSON :: StrEncoding a => a -> J.Value
 strToJSON = J.String . decodeLatin1 . strEncode

@@ -1,34 +1,24 @@
 {-# LANGUAGE DataKinds #-}
-{-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE ScopedTypeVariables #-}

 module Simplex.Messaging.Notifications.Client where

 import Control.Monad.Except
 import Control.Monad.Trans.Except
-import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.Word (Word16)
-import Database.SQLite.Simple.FromField (FromField (..))
-import Database.SQLite.Simple.ToField (ToField (..))
 import Simplex.Messaging.Client
 import qualified Simplex.Messaging.Crypto as C
-import Simplex.Messaging.Encoding
 import Simplex.Messaging.Notifications.Protocol
-import Simplex.Messaging.Parsers (blobFieldDecoder)
-import Simplex.Messaging.Protocol (ProtocolServer)
-
-type NtfServer = ProtocolServer
+import Simplex.Messaging.Util (bshow)

 type NtfClient = ProtocolClient NtfResponse

 ntfRegisterToken :: NtfClient -> C.APrivateSignKey -> NewNtfEntity 'Token -> ExceptT ProtocolClientError IO (NtfTokenId, C.PublicKeyX25519)
 ntfRegisterToken c pKey newTkn =
  sendNtfCommand c (Just pKey) "" (TNEW newTkn) >>= \case
-    NRId tknId dhKey -> pure (tknId, dhKey)
-    _ -> throwE PCEUnexpectedResponse
+    NRTknId tknId dhKey -> pure (tknId, dhKey)
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 ntfVerifyToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> NtfRegCode -> ExceptT ProtocolClientError IO ()
 ntfVerifyToken c pKey tknId code = okNtfCommand (TVFY code) c pKey tknId
@@ -37,7 +27,10 @@ ntfCheckToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> ExceptT Protoco
 ntfCheckToken c pKey tknId =
  sendNtfCommand c (Just pKey) tknId TCHK >>= \case
    NRTkn stat -> pure stat
-    _ -> throwE PCEUnexpectedResponse
+    r -> throwE . PCEUnexpectedResponse $ bshow r
+
+ntfReplaceToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> DeviceToken -> ExceptT ProtocolClientError IO ()
+ntfReplaceToken c pKey tknId token = okNtfCommand (TRPL token) c pKey tknId

 ntfDeleteToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> ExceptT ProtocolClientError IO ()
 ntfDeleteToken = okNtfCommand TDEL
@@ -45,17 +38,17 @@ ntfDeleteToken = okNtfCommand TDEL
 ntfEnableCron :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> Word16 -> ExceptT ProtocolClientError IO ()
 ntfEnableCron c pKey tknId int = okNtfCommand (TCRN int) c pKey tknId

-ntfCreateSubsciption :: NtfClient -> C.APrivateSignKey -> NewNtfEntity 'Subscription -> ExceptT ProtocolClientError IO (NtfSubscriptionId, C.PublicKeyX25519)
-ntfCreateSubsciption c pKey newSub =
+ntfCreateSubscription :: NtfClient -> C.APrivateSignKey -> NewNtfEntity 'Subscription -> ExceptT ProtocolClientError IO NtfSubscriptionId
+ntfCreateSubscription c pKey newSub =
  sendNtfCommand c (Just pKey) "" (SNEW newSub) >>= \case
-    NRId tknId dhKey -> pure (tknId, dhKey)
-    _ -> throwE PCEUnexpectedResponse
+    NRSubId subId -> pure subId
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 ntfCheckSubscription :: NtfClient -> C.APrivateSignKey -> NtfSubscriptionId -> ExceptT ProtocolClientError IO NtfSubStatus
 ntfCheckSubscription c pKey subId =
  sendNtfCommand c (Just pKey) subId SCHK >>= \case
    NRSub stat -> pure stat
-    _ -> throwE PCEUnexpectedResponse
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 ntfDeleteSubscription :: NtfClient -> C.APrivateSignKey -> NtfSubscriptionId -> ExceptT ProtocolClientError IO ()
 ntfDeleteSubscription = okNtfCommand SDEL
@@ -68,65 +61,4 @@ okNtfCommand :: NtfEntityI e => NtfCommand e -> NtfClient -> C.APrivateSignKey -
 okNtfCommand cmd c pKey entId =
  sendNtfCommand c (Just pKey) entId cmd >>= \case
    NROk -> return ()
-    _ -> throwE PCEUnexpectedResponse
-
-data NtfTknAction
-  = NTARegister
-  | NTAVerify NtfRegCode -- code to verify token
-  | NTACheck
-  | NTACron Word16
-  | NTADelete
-  deriving (Show)
-
-instance Encoding NtfTknAction where
-  smpEncode = \case
-    NTARegister -> "R"
-    NTAVerify code -> smpEncode ('V', code)
-    NTACheck -> "C"
-    NTACron interval -> smpEncode ('I', interval)
-    NTADelete -> "D"
-  smpP =
-    A.anyChar >>= \case
-      'R' -> pure NTARegister
-      'V' -> NTAVerify <$> smpP
-      'C' -> pure NTACheck
-      'I' -> NTACron <$> smpP
-      'D' -> pure NTADelete
-      _ -> fail "bad NtfTknAction"
-
-instance FromField NtfTknAction where fromField = blobFieldDecoder smpDecode
-
-instance ToField NtfTknAction where toField = toField . smpEncode
-
-data NtfToken = NtfToken
-  { deviceToken :: DeviceToken,
-    ntfServer :: NtfServer,
-    ntfTokenId :: Maybe NtfTokenId,
-    -- | key used by the ntf server to verify transmissions
-    ntfPubKey :: C.APublicVerifyKey,
-    -- | key used by the ntf client to sign transmissions
-    ntfPrivKey :: C.APrivateSignKey,
-    -- | client's DH keys (to repeat registration if necessary)
-    ntfDhKeys :: C.KeyPair 'C.X25519,
-    -- | shared DH secret used to encrypt/decrypt notifications e2e
-    ntfDhSecret :: Maybe C.DhSecretX25519,
-    -- | token status
-    ntfTknStatus :: NtfTknStatus,
-    -- | pending token action and the earliest time
-    ntfTknAction :: Maybe NtfTknAction
-  }
-  deriving (Show)
-
-newNtfToken :: DeviceToken -> NtfServer -> C.ASignatureKeyPair -> C.KeyPair 'C.X25519 -> NtfToken
-newNtfToken deviceToken ntfServer (ntfPubKey, ntfPrivKey) ntfDhKeys =
-  NtfToken
-    { deviceToken,
-      ntfServer,
-      ntfTokenId = Nothing,
-      ntfPubKey,
-      ntfPrivKey,
-      ntfDhKeys,
-      ntfDhSecret = Nothing,
-      ntfTknStatus = NTNew,
-      ntfTknAction = Just NTARegister
-    }
+    r -> throwE . PCEUnexpectedResponse $ bshow r
@@ -10,7 +10,7 @@

 module Simplex.Messaging.Notifications.Protocol where

-import Data.Aeson (FromJSON (..), ToJSON (..))
+import Data.Aeson (FromJSON (..), ToJSON (..), (.=))
 import qualified Data.Aeson as J
 import qualified Data.Aeson.Encoding as JE
 import qualified Data.Attoparsec.ByteString.Char8 as A
@@ -23,13 +23,14 @@ import Data.Type.Equality
 import Data.Word (Word16)
 import Database.SQLite.Simple.FromField (FromField (..))
 import Database.SQLite.Simple.ToField (ToField (..))
+import Simplex.Messaging.Agent.Protocol (updateSMPServerHosts)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Notifications.Transport (ntfClientHandshake)
 import Simplex.Messaging.Parsers (fromTextField_)
 import Simplex.Messaging.Protocol hiding (Command (..), CommandTag (..))
-import Simplex.Messaging.Util ((<$?>))
+import Simplex.Messaging.Util (eitherToMaybe, (<$?>))

 data NtfEntity = Token | Subscription
  deriving (Show)
@@ -55,6 +56,7 @@ data NtfCommandTag (e :: NtfEntity) where
  TNEW_ :: NtfCommandTag 'Token
  TVFY_ :: NtfCommandTag 'Token
  TCHK_ :: NtfCommandTag 'Token
+  TRPL_ :: NtfCommandTag 'Token
  TDEL_ :: NtfCommandTag 'Token
  TCRN_ :: NtfCommandTag 'Token
  SNEW_ :: NtfCommandTag 'Subscription
@@ -71,6 +73,7 @@ instance NtfEntityI e => Encoding (NtfCommandTag e) where
    TNEW_ -> "TNEW"
    TVFY_ -> "TVFY"
    TCHK_ -> "TCHK"
+    TRPL_ -> "TRPL"
    TDEL_ -> "TDEL"
    TCRN_ -> "TCRN"
    SNEW_ -> "SNEW"
@@ -88,6 +91,7 @@ instance ProtocolMsgTag NtfCmdTag where
    "TNEW" -> Just $ NCT SToken TNEW_
    "TVFY" -> Just $ NCT SToken TVFY_
    "TCHK" -> Just $ NCT SToken TCHK_
+    "TRPL" -> Just $ NCT SToken TRPL_
    "TDEL" -> Just $ NCT SToken TDEL_
    "TCRN" -> Just $ NCT SToken TCRN_
    "SNEW" -> Just $ NCT SSubscription SNEW_
@@ -120,16 +124,18 @@ instance ToJSON NtfRegCode where

 data NewNtfEntity (e :: NtfEntity) where
  NewNtfTkn :: DeviceToken -> C.APublicVerifyKey -> C.PublicKeyX25519 -> NewNtfEntity 'Token
-  NewNtfSub :: NtfTokenId -> SMPQueueNtf -> NewNtfEntity 'Subscription
+  NewNtfSub :: NtfTokenId -> SMPQueueNtf -> NtfPrivateSignKey -> NewNtfEntity 'Subscription

 deriving instance Show (NewNtfEntity e)

 data ANewNtfEntity = forall e. NtfEntityI e => ANE (SNtfEntity e) (NewNtfEntity e)

+deriving instance Show ANewNtfEntity
+
 instance NtfEntityI e => Encoding (NewNtfEntity e) where
  smpEncode = \case
    NewNtfTkn tkn verifyKey dhPubKey -> smpEncode ('T', tkn, verifyKey, dhPubKey)
-    NewNtfSub tknId smpQueue -> smpEncode ('S', tknId, smpQueue)
+    NewNtfSub tknId smpQueue notifierKey -> smpEncode ('S', tknId, smpQueue, notifierKey)
  smpP = (\(ANE _ c) -> checkEntity c) <$?> smpP

 instance Encoding ANewNtfEntity where
@@ -137,11 +143,12 @@ instance Encoding ANewNtfEntity where
  smpP =
    A.anyChar >>= \case
      'T' -> ANE SToken <$> (NewNtfTkn <$> smpP <*> smpP <*> smpP)
-      'S' -> ANE SSubscription <$> (NewNtfSub <$> smpP <*> smpP)
+      'S' -> ANE SSubscription <$> (NewNtfSub <$> smpP <*> smpP <*> smpP)
      _ -> fail "bad ANewNtfEntity"

 instance Protocol NtfResponse where
-  type ProtocolCommand NtfResponse = NtfCmd
+  type ProtoCommand NtfResponse = NtfCmd
+  type ProtoType NtfResponse = 'PNTF
  protocolClientHandshake = ntfClientHandshake
  protocolPing = NtfCmd SSubscription PING
  protocolError = \case
@@ -155,13 +162,15 @@ data NtfCommand (e :: NtfEntity) where
  TVFY :: NtfRegCode -> NtfCommand 'Token
  -- | check token status
  TCHK :: NtfCommand 'Token
+  -- | replace device token (while keeping all existing subscriptions)
+  TRPL :: DeviceToken -> NtfCommand 'Token
  -- | delete token - all subscriptions will be removed and no more notifications will be sent
  TDEL :: NtfCommand 'Token
  -- | enable periodic background notification to fetch the new messages - interval is in minutes, minimum is 20, 0 to disable
  TCRN :: Word16 -> NtfCommand 'Token
  -- | create SMP subscription
  SNEW :: NewNtfEntity 'Subscription -> NtfCommand 'Subscription
-  -- | check SMP subscription status (response is STAT)
+  -- | check SMP subscription status (response is SUB)
  SCHK :: NtfCommand 'Subscription
  -- | delete SMP subscription
  SDEL :: NtfCommand 'Subscription
@@ -176,10 +185,11 @@ deriving instance Show NtfCmd

 instance NtfEntityI e => ProtocolEncoding (NtfCommand e) where
  type Tag (NtfCommand e) = NtfCommandTag e
-  encodeProtocol = \case
+  encodeProtocol _v = \case
    TNEW newTkn -> e (TNEW_, ' ', newTkn)
    TVFY code -> e (TVFY_, ' ', code)
    TCHK -> e TCHK_
+    TRPL tkn -> e (TRPL_, ' ', tkn)
    TDEL -> e TDEL_
    TCRN int -> e (TCRN_, ' ', int)
    SNEW newSub -> e (SNEW_, ' ', newSub)
@@ -190,7 +200,7 @@ instance NtfEntityI e => ProtocolEncoding (NtfCommand e) where
      e :: Encoding a => a -> ByteString
      e = smpEncode

-  protocolP tag = (\(NtfCmd _ c) -> checkEntity c) <$?> protocolP (NCT (sNtfEntity @e) tag)
+  protocolP _v tag = (\(NtfCmd _ c) -> checkEntity c) <$?> protocolP _v (NCT (sNtfEntity @e) tag)

  checkCredentials (sig, _, entityId, _) cmd = case cmd of
    -- TNEW and SNEW must have signature but NOT token/subscription IDs
@@ -211,14 +221,15 @@ instance NtfEntityI e => ProtocolEncoding (NtfCommand e) where

 instance ProtocolEncoding NtfCmd where
  type Tag NtfCmd = NtfCmdTag
-  encodeProtocol (NtfCmd _ c) = encodeProtocol c
+  encodeProtocol _v (NtfCmd _ c) = encodeProtocol _v c

-  protocolP = \case
+  protocolP _v = \case
    NCT SToken tag ->
      NtfCmd SToken <$> case tag of
        TNEW_ -> TNEW <$> _smpP
        TVFY_ -> TVFY <$> _smpP
        TCHK_ -> pure TCHK
+        TRPL_ -> TRPL <$> _smpP
        TDEL_ -> pure TDEL
        TCRN_ -> TCRN <$> _smpP
    NCT SSubscription tag ->
@@ -231,7 +242,8 @@ instance ProtocolEncoding NtfCmd where
  checkCredentials t (NtfCmd e c) = NtfCmd e <$> checkCredentials t c

 data NtfResponseTag
-  = NRId_
+  = NRTknId_
+  | NRSubId_
  | NROk_
  | NRErr_
  | NRTkn_
@@ -241,7 +253,8 @@ data NtfResponseTag

 instance Encoding NtfResponseTag where
  smpEncode = \case
-    NRId_ -> "ID"
+    NRTknId_ -> "IDTKN" -- it should be "TID", "SID"
+    NRSubId_ -> "IDSUB"
    NROk_ -> "OK"
    NRErr_ -> "ERR"
    NRTkn_ -> "TKN"
@@ -251,7 +264,8 @@ instance Encoding NtfResponseTag where

 instance ProtocolMsgTag NtfResponseTag where
  decodeTag = \case
-    "ID" -> Just NRId_
+    "IDTKN" -> Just NRTknId_
+    "IDSUB" -> Just NRSubId_
    "OK" -> Just NROk_
    "ERR" -> Just NRErr_
    "TKN" -> Just NRTkn_
@@ -260,7 +274,8 @@ instance ProtocolMsgTag NtfResponseTag where
    _ -> Nothing

 data NtfResponse
-  = NRId NtfEntityId C.PublicKeyX25519
+  = NRTknId NtfEntityId C.PublicKeyX25519
+  | NRSubId NtfEntityId
  | NROk
  | NRErr ErrorType
  | NRTkn NtfTknStatus
@@ -270,8 +285,9 @@ data NtfResponse

 instance ProtocolEncoding NtfResponse where
  type Tag NtfResponse = NtfResponseTag
-  encodeProtocol = \case
-    NRId entId dhKey -> e (NRId_, ' ', entId, dhKey)
+  encodeProtocol _v = \case
+    NRTknId entId dhKey -> e (NRTknId_, ' ', entId, dhKey)
+    NRSubId entId -> e (NRSubId_, ' ', entId)
    NROk -> e NROk_
    NRErr err -> e (NRErr_, ' ', err)
    NRTkn stat -> e (NRTkn_, ' ', stat)
@@ -281,8 +297,9 @@ instance ProtocolEncoding NtfResponse where
      e :: Encoding a => a -> ByteString
      e = smpEncode

-  protocolP = \case
-    NRId_ -> NRId <$> _smpP <*> smpP
+  protocolP _v = \case
+    NRTknId_ -> NRTknId <$> _smpP <*> smpP
+    NRSubId_ -> NRSubId <$> _smpP
    NROk_ -> pure NROk
    NRErr_ -> NRErr <$> _smpP
    NRTkn_ -> NRTkn <$> _smpP
@@ -290,8 +307,10 @@ instance ProtocolEncoding NtfResponse where
    NRPong_ -> pure NRPong

  checkCredentials (_, _, entId, _) cmd = case cmd of
-    -- ID response must not have queue ID
-    NRId {} -> noEntity
+    -- IDTKN response must not have queue ID
+    NRTknId {} -> noEntity
+    -- IDSUB response must not have queue ID
+    NRSubId {} -> noEntity
    -- ERR response does not always have entity ID
    NRErr _ -> Right cmd
    -- PONG response must not have queue ID
@@ -306,39 +325,55 @@ instance ProtocolEncoding NtfResponse where
        | otherwise = Left $ CMD HAS_AUTH

 data SMPQueueNtf = SMPQueueNtf
-  { smpServer :: ProtocolServer,
-    notifierId :: NotifierId,
-    notifierKey :: NtfPrivateSignKey
+  { smpServer :: SMPServer,
+    notifierId :: NotifierId
  }
-  deriving (Show)
+  deriving (Eq, Ord, Show)

 instance Encoding SMPQueueNtf where
-  smpEncode SMPQueueNtf {smpServer, notifierId, notifierKey} = smpEncode (smpServer, notifierId, notifierKey)
+  smpEncode SMPQueueNtf {smpServer, notifierId} = smpEncode (smpServer, notifierId)
  smpP = do
-    (smpServer, notifierId, notifierKey) <- smpP
-    pure $ SMPQueueNtf smpServer notifierId notifierKey
+    smpServer <- updateSMPServerHosts <$> smpP
+    notifierId <- smpP
+    pure SMPQueueNtf {smpServer, notifierId}

-data PushProvider = PPApns
+instance StrEncoding SMPQueueNtf where
+  strEncode SMPQueueNtf {smpServer, notifierId} = strEncode smpServer <> "/" <> strEncode notifierId
+  strP = do
+    smpServer <- updateSMPServerHosts <$> strP
+    notifierId <- A.char '/' *> strP
+    pure SMPQueueNtf {smpServer, notifierId}
+
+data PushProvider = PPApnsDev | PPApnsProd | PPApnsTest
  deriving (Eq, Ord, Show)

 instance Encoding PushProvider where
  smpEncode = \case
-    PPApns -> "A"
+    PPApnsDev -> "AD"
+    PPApnsProd -> "AP"
+    PPApnsTest -> "AT"
  smpP =
-    A.anyChar >>= \case
-      'A' -> pure PPApns
+    A.take 2 >>= \case
+      "AD" -> pure PPApnsDev
+      "AP" -> pure PPApnsProd
+      "AT" -> pure PPApnsTest
      _ -> fail "bad PushProvider"

-instance TextEncoding PushProvider where
-  textEncode = \case
-    PPApns -> "apple"
-  textDecode = \case
-    "apple" -> Just PPApns
-    _ -> Nothing
+instance StrEncoding PushProvider where
+  strEncode = \case
+    PPApnsDev -> "apns_dev"
+    PPApnsProd -> "apns_prod"
+    PPApnsTest -> "apns_test"
+  strP =
+    A.takeTill (== ' ') >>= \case
+      "apns_dev" -> pure PPApnsDev
+      "apns_prod" -> pure PPApnsProd
+      "apns_test" -> pure PPApnsTest
+      _ -> fail "bad PushProvider"

-instance FromField PushProvider where fromField = fromTextField_ textDecode
+instance FromField PushProvider where fromField = fromTextField_ $ eitherToMaybe . strDecode . encodeUtf8

-instance ToField PushProvider where toField = toField . textEncode
+instance ToField PushProvider where toField = toField . decodeLatin1 . strEncode

 data DeviceToken = DeviceToken PushProvider ByteString
  deriving (Eq, Ord, Show)
@@ -347,6 +382,18 @@ instance Encoding DeviceToken where
  smpEncode (DeviceToken p t) = smpEncode (p, t)
  smpP = DeviceToken <$> smpP <*> smpP

+instance StrEncoding DeviceToken where
+  strEncode (DeviceToken p t) = strEncode p <> " " <> t
+  strP = DeviceToken <$> strP <* A.space <*> hexStringP
+    where
+      hexStringP =
+        A.takeWhile (\c -> A.isDigit c || (c >= 'a' && c <= 'f')) >>= \s ->
+          if even (B.length s) then pure s else fail "odd number of hex characters"
+
+instance ToJSON DeviceToken where
+  toEncoding (DeviceToken pp t) = J.pairs $ "pushProvider" .= decodeLatin1 (strEncode pp) <> "token" .= decodeLatin1 t
+  toJSON (DeviceToken pp t) = J.object ["pushProvider" .= decodeLatin1 (strEncode pp), "token" .= decodeLatin1 t]
+
 type NtfEntityId = ByteString

 type NtfSubscriptionId = NtfEntityId
@@ -360,28 +407,50 @@ data NtfSubStatus
    NSPending
  | -- | connected and subscribed to SMP server
    NSActive
-  | -- | NEND received (we currently do not support it)
+  | -- | disconnected/unsubscribed from SMP server
+    NSInactive
+  | -- | END received
    NSEnd
  | -- | SMP AUTH error
-    NSSMPAuth
+    NSAuth
+  | -- | SMP error other than AUTH
+    NSErr ByteString
  deriving (Eq, Show)

+ntfShouldSubscribe :: NtfSubStatus -> Bool
+ntfShouldSubscribe = \case
+  NSNew -> True
+  NSPending -> True
+  NSActive -> True
+  NSInactive -> True
+  NSEnd -> False
+  NSAuth -> False
+  NSErr _ -> False
+
 instance Encoding NtfSubStatus where
  smpEncode = \case
    NSNew -> "NEW"
    NSPending -> "PENDING" -- e.g. after SMP server disconnect/timeout while ntf server is retrying to connect
    NSActive -> "ACTIVE"
+    NSInactive -> "INACTIVE"
    NSEnd -> "END"
-    NSSMPAuth -> "SMP_AUTH"
+    NSAuth -> "AUTH"
+    NSErr err -> "ERR " <> err
  smpP =
    A.takeTill (== ' ') >>= \case
      "NEW" -> pure NSNew
      "PENDING" -> pure NSPending
      "ACTIVE" -> pure NSActive
+      "INACTIVE" -> pure NSInactive
      "END" -> pure NSEnd
-      "SMP_AUTH" -> pure NSSMPAuth
+      "AUTH" -> pure NSAuth
+      "ERR" -> NSErr <$> (A.space *> A.takeByteString)
      _ -> fail "bad NtfSubStatus"

+instance StrEncoding NtfSubStatus where
+  strEncode = smpEncode
+  strP = smpP
+
 data NtfTknStatus
  = -- | Token created in DB
    NTNew
@@ -415,6 +484,10 @@ instance Encoding NtfTknStatus where
      "EXPIRED" -> pure NTExpired
      _ -> fail "bad NtfTknStatus"

+instance StrEncoding NtfTknStatus where
+  strEncode = smpEncode
+  strP = smpP
+
 instance FromField NtfTknStatus where fromField = fromTextField_ $ either (const Nothing) Just . smpDecode . encodeUtf8

 instance ToField NtfTknStatus where toField = toField . decodeLatin1 . smpEncode
@@ -4,131 +4,304 @@
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE NumericUnderscores #-}
+{-# LANGUAGE OverloadedLists #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TupleSections #-}

 module Simplex.Messaging.Notifications.Server where

+import Control.Concurrent.STM (stateTVar)
 import Control.Logger.Simple
 import Control.Monad.Except
-import Control.Monad.IO.Unlift (MonadUnliftIO)
 import Control.Monad.Reader
-import Crypto.Random (MonadRandom)
 import Data.ByteString.Char8 (ByteString)
+import qualified Data.ByteString.Char8 as B
+import Data.Functor (($>))
+import Data.List (intercalate)
+import Data.Map.Strict (Map)
 import qualified Data.Text as T
+import Data.Text.Encoding (decodeLatin1)
+import Data.Time.Clock (UTCTime (..), diffTimeToPicoseconds, getCurrentTime)
 import Data.Time.Clock.System (getSystemTime)
+import Data.Time.Format.ISO8601 (iso8601Show)
 import Network.Socket (ServiceName)
+import Simplex.Messaging.Client (ProtocolClientError (..))
 import Simplex.Messaging.Client.Agent
 import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Notifications.Protocol
 import Simplex.Messaging.Notifications.Server.Env
-import Simplex.Messaging.Notifications.Server.Push.APNS
+import Simplex.Messaging.Notifications.Server.Push.APNS (PNMessageData (..), PushNotification (..), PushProviderError (..))
+import Simplex.Messaging.Notifications.Server.Stats
 import Simplex.Messaging.Notifications.Server.Store
+import Simplex.Messaging.Notifications.Server.StoreLog
 import Simplex.Messaging.Notifications.Transport
-import Simplex.Messaging.Protocol (ErrorType (..), SignedTransmission, Transmission, encodeTransmission, tGet, tPut)
+import Simplex.Messaging.Protocol (ErrorType (..), ProtocolServer (host), SMPServer, SignedTransmission, Transmission, encodeTransmission, tGet, tPut)
 import qualified Simplex.Messaging.Protocol as SMP
 import Simplex.Messaging.Server
+import Simplex.Messaging.Server.Stats
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport (ATransport (..), THandle (..), TProxy, Transport (..))
 import Simplex.Messaging.Transport.Server (runTransportServer)
 import Simplex.Messaging.Util
-import UnliftIO (async, uninterruptibleCancel)
-import UnliftIO.Concurrent (threadDelay)
+import System.Exit (exitFailure)
+import System.IO (BufferMode (..), hPutStrLn, hSetBuffering)
+import System.Mem.Weak (deRefWeak)
+import UnliftIO (IOMode (..), async, uninterruptibleCancel, withFile)
+import UnliftIO.Concurrent (forkIO, killThread, mkWeakThreadId, threadDelay)
+import UnliftIO.Directory (doesFileExist, renameFile)
 import UnliftIO.Exception
 import UnliftIO.STM

-runNtfServer :: (MonadRandom m, MonadUnliftIO m) => NtfServerConfig -> m ()
+runNtfServer :: NtfServerConfig -> IO ()
 runNtfServer cfg = do
  started <- newEmptyTMVarIO
  runNtfServerBlocking started cfg

-runNtfServerBlocking :: (MonadRandom m, MonadUnliftIO m) => TMVar Bool -> NtfServerConfig -> m ()
+runNtfServerBlocking :: TMVar Bool -> NtfServerConfig -> IO ()
 runNtfServerBlocking started cfg = runReaderT (ntfServer cfg started) =<< newNtfServerEnv cfg

-ntfServer :: forall m. (MonadUnliftIO m, MonadReader NtfEnv m) => NtfServerConfig -> TMVar Bool -> m ()
-ntfServer NtfServerConfig {transports} started = do
+type M a = ReaderT NtfEnv IO a
+
+ntfServer :: NtfServerConfig -> TMVar Bool -> M ()
+ntfServer cfg@NtfServerConfig {transports, logTLSErrors} started = do
+  restoreServerStats
  s <- asks subscriber
  ps <- asks pushServer
-  raceAny_ (ntfSubscriber s : ntfPush ps : map runServer transports)
+  subs <- readTVarIO =<< asks (subscriptions . store)
+  void . forkIO $ resubscribe s subs
+  raceAny_ (ntfSubscriber s : ntfPush ps : map runServer transports <> serverStatsThread_ cfg) `finally` stopServer
  where
-    runServer :: (ServiceName, ATransport) -> m ()
+    runServer :: (ServiceName, ATransport) -> M ()
    runServer (tcpPort, ATransport t) = do
      serverParams <- asks tlsServerParams
-      runTransportServer started tcpPort serverParams (runClient t)
+      runTransportServer started tcpPort serverParams logTLSErrors (runClient t)

-    runClient :: Transport c => TProxy c -> c -> m ()
+    runClient :: Transport c => TProxy c -> c -> M ()
    runClient _ h = do
      kh <- asks serverIdentity
-      liftIO (runExceptT $ ntfServerHandshake h kh) >>= \case
+      liftIO (runExceptT $ ntfServerHandshake h kh supportedNTFServerVRange) >>= \case
        Right th -> runNtfClientTransport th
        Left _ -> pure ()

-ntfSubscriber :: forall m. MonadUnliftIO m => NtfSubscriber -> m ()
-ntfSubscriber NtfSubscriber {subQ, smpAgent = ca@SMPClientAgent {msgQ, agentQ}} = do
+    stopServer :: M ()
+    stopServer = do
+      withNtfLog closeStoreLog
+      saveServerStats
+      asks (smpSubscribers . subscriber) >>= readTVarIO >>= mapM_ (\SMPSubscriber {subThreadId} -> readTVarIO subThreadId >>= mapM_ (liftIO . deRefWeak >=> mapM_ killThread))
+
+    serverStatsThread_ :: NtfServerConfig -> [M ()]
+    serverStatsThread_ NtfServerConfig {logStatsInterval = Just interval, logStatsStartTime, serverStatsLogFile} =
+      [logServerStats logStatsStartTime interval serverStatsLogFile]
+    serverStatsThread_ _ = []
+
+    logServerStats :: Int -> Int -> FilePath -> M ()
+    logServerStats startAt logInterval statsFilePath = do
+      initialDelay <- (startAt -) . fromIntegral . (`div` 1000000_000000) . diffTimeToPicoseconds . utctDayTime <$> liftIO getCurrentTime
+      liftIO $ putStrLn $ "server stats log enabled: " <> statsFilePath
+      threadDelay $ 1000000 * (initialDelay + if initialDelay < 0 then 86400 else 0)
+      NtfServerStats {fromTime, tknCreated, tknVerified, tknDeleted, subCreated, subDeleted, ntfReceived, ntfDelivered, activeTokens, activeSubs} <- asks serverStats
+      let interval = 1000000 * logInterval
+      withFile statsFilePath AppendMode $ \h -> liftIO $ do
+        hSetBuffering h LineBuffering
+        forever $ do
+          ts <- getCurrentTime
+          fromTime' <- atomically $ swapTVar fromTime ts
+          tknCreated' <- atomically $ swapTVar tknCreated 0
+          tknVerified' <- atomically $ swapTVar tknVerified 0
+          tknDeleted' <- atomically $ swapTVar tknDeleted 0
+          subCreated' <- atomically $ swapTVar subCreated 0
+          subDeleted' <- atomically $ swapTVar subDeleted 0
+          ntfReceived' <- atomically $ swapTVar ntfReceived 0
+          ntfDelivered' <- atomically $ swapTVar ntfDelivered 0
+          tkn <- atomically $ periodStatCounts activeTokens ts
+          sub <- atomically $ periodStatCounts activeSubs ts
+          hPutStrLn h $
+            intercalate
+              ","
+              [ iso8601Show $ utctDay fromTime',
+                show tknCreated',
+                show tknVerified',
+                show tknDeleted',
+                show subCreated',
+                show subDeleted',
+                show ntfReceived',
+                show ntfDelivered',
+                dayCount tkn,
+                weekCount tkn,
+                monthCount tkn,
+                dayCount sub,
+                weekCount sub,
+                monthCount sub
+              ]
+          threadDelay interval
+
+resubscribe :: NtfSubscriber -> Map NtfSubscriptionId NtfSubData -> M ()
+resubscribe NtfSubscriber {newSubQ} subs = do
+  d <- asks $ resubscribeDelay . config
+  forM_ subs $ \sub@NtfSubData {} ->
+    whenM (ntfShouldSubscribe <$> readTVarIO (subStatus sub)) $ do
+      atomically $ writeTBQueue newSubQ $ NtfSub sub
+      threadDelay d
+  liftIO $ logInfo "SMP connections resubscribed"
+
+ntfSubscriber :: NtfSubscriber -> M ()
+ntfSubscriber NtfSubscriber {smpSubscribers, newSubQ, smpAgent = ca@SMPClientAgent {msgQ, agentQ}} = do
  raceAny_ [subscribe, receiveSMP, receiveAgent]
  where
-    subscribe :: m ()
-    subscribe = forever $ do
-      atomically (readTBQueue subQ) >>= \case
-        NtfSub NtfSubData {smpQueue} -> do
-          let SMPQueueNtf {smpServer, notifierId, notifierKey} = smpQueue
-          liftIO (runExceptT $ subscribeQueue ca smpServer ((SPNotifier, notifierId), notifierKey)) >>= \case
-            Right _ -> pure () -- update subscription status
-            Left _e -> pure ()
+    subscribe :: M ()
+    subscribe =
+      forever $
+        atomically (readTBQueue newSubQ) >>= \case
+          sub@(NtfSub NtfSubData {smpQueue = SMPQueueNtf {smpServer}}) -> do
+            SMPSubscriber {newSubQ = subscriberSubQ} <- getSMPSubscriber smpServer
+            atomically $ writeTQueue subscriberSubQ sub

-    receiveSMP :: m ()
+    getSMPSubscriber :: SMPServer -> M SMPSubscriber
+    getSMPSubscriber smpServer =
+      atomically (TM.lookup smpServer smpSubscribers) >>= maybe createSMPSubscriber pure
+      where
+        createSMPSubscriber = do
+          sub@SMPSubscriber {subThreadId} <- atomically newSMPSubscriber
+          atomically $ TM.insert smpServer sub smpSubscribers
+          tId <- mkWeakThreadId =<< forkIO (runSMPSubscriber sub)
+          atomically . writeTVar subThreadId $ Just tId
+          pure sub
+
+    runSMPSubscriber :: SMPSubscriber -> M ()
+    runSMPSubscriber SMPSubscriber {newSubQ = subscriberSubQ} =
+      forever $
+        atomically (peekTQueue subscriberSubQ)
+          >>= \(NtfSub NtfSubData {smpQueue, notifierKey}) -> do
+            updateSubStatus smpQueue NSPending
+            let SMPQueueNtf {smpServer, notifierId} = smpQueue
+            liftIO (runExceptT $ subscribeQueue ca smpServer ((SPNotifier, notifierId), notifierKey)) >>= \case
+              Right _ -> do
+                updateSubStatus smpQueue NSActive
+                void . atomically $ readTQueue subscriberSubQ
+              Left err -> do
+                handleSubError smpQueue err
+                case err of
+                  PCEResponseTimeout -> pure ()
+                  PCENetworkError -> pure ()
+                  _ -> void . atomically $ readTQueue subscriberSubQ
+
+    receiveSMP :: M ()
    receiveSMP = forever $ do
-      (_srv, _sessId, _ntfId, msg) <- atomically $ readTBQueue msgQ
+      (srv, _, _, ntfId, msg) <- atomically $ readTBQueue msgQ
+      let smpQueue = SMPQueueNtf srv ntfId
      case msg of
-        SMP.NMSG -> do
-          -- check when the last NMSG was received from this queue
-          -- update timestamp
-          -- check what was the last hidden notification was sent (and whether to this queue)
-          -- decide whether it should be sent as hidden or visible
-          -- construct and possibly encrypt notification
-          -- send it
-          pure ()
+        SMP.NMSG nmsgNonce encNMsgMeta -> do
+          ntfTs <- liftIO getSystemTime
+          st <- asks store
+          NtfPushServer {pushQ} <- asks pushServer
+          stats <- asks serverStats
+          atomically $ updatePeriodStats (activeSubs stats) ntfId
+          atomically $
+            findNtfSubscriptionToken st smpQueue
+              >>= mapM_ (\tkn -> writeTBQueue pushQ (tkn, PNMessage PNMessageData {smpQueue, ntfTs, nmsgNonce, encNMsgMeta}))
+          incNtfStat ntfReceived
+        SMP.END -> updateSubStatus smpQueue NSEnd
        _ -> pure ()
-      pure ()

    receiveAgent =
      forever $
        atomically (readTBQueue agentQ) >>= \case
          CAConnected _ -> pure ()
-          CADisconnected _srv _subs -> do
-            -- update subscription statuses
-            pure ()
-          CAReconnected _ -> pure ()
-          CAResubscribed _srv _sub -> do
-            -- update subscription status
-            pure ()
-          CASubError _srv _sub _err -> do
-            -- update subscription status
-            pure ()
+          CADisconnected srv subs -> do
+            logInfo $ "SMP server disconnected " <> showServer' srv <> " (" <> tshow (length subs) <> ") subscriptions"
+            forM_ subs $ \(_, ntfId) -> do
+              let smpQueue = SMPQueueNtf srv ntfId
+              updateSubStatus smpQueue NSInactive
+          CAReconnected srv ->
+            logInfo $ "SMP server reconnected " <> showServer' srv
+          CAResubscribed srv sub -> do
+            let ntfId = snd sub
+                smpQueue = SMPQueueNtf srv ntfId
+            updateSubStatus smpQueue NSActive
+          CASubError srv (_, ntfId) err -> do
+            logError $ "SMP subscription error on server " <> showServer' srv <> ": " <> tshow err
+            handleSubError (SMPQueueNtf srv ntfId) err
+      where
+        showServer' = decodeLatin1 . strEncode . host

-ntfPush :: MonadUnliftIO m => NtfPushServer -> m ()
-ntfPush s@NtfPushServer {pushQ} = liftIO . forever . runExceptT $ do
-  (tkn@NtfTknData {token = DeviceToken pp _, tknStatus}, ntf) <- atomically (readTBQueue pushQ)
-  logDebug $ "sending push notification to " <> T.pack (show pp)
+    handleSubError :: SMPQueueNtf -> ProtocolClientError -> M ()
+    handleSubError smpQueue = \case
+      PCEProtocolError AUTH -> updateSubStatus smpQueue NSAuth
+      PCEProtocolError e -> updateErr "SMP error " e
+      PCEIOError e -> updateErr "IOError " e
+      PCEResponseError e -> updateErr "ResponseError " e
+      PCEUnexpectedResponse r -> updateErr "UnexpectedResponse " r
+      PCETransportError e -> updateErr "TransportError " e
+      PCESignatureError e -> updateErr "SignatureError " e
+      PCEIncompatibleHost -> updateSubStatus smpQueue $ NSErr "IncompatibleHost"
+      PCEResponseTimeout -> pure ()
+      PCENetworkError -> pure ()
+      where
+        updateErr :: Show e => ByteString -> e -> M ()
+        updateErr errType e = updateSubStatus smpQueue . NSErr $ errType <> bshow e
+
+    updateSubStatus smpQueue status = do
+      st <- asks store
+      atomically (findNtfSubscription st smpQueue)
+        >>= mapM_
+          ( \NtfSubData {ntfSubId, subStatus} -> do
+              atomically $ writeTVar subStatus status
+              withNtfLog $ \sl -> logSubscriptionStatus sl ntfSubId status
+          )
+
+ntfPush :: NtfPushServer -> M ()
+ntfPush s@NtfPushServer {pushQ} = forever $ do
+  (tkn@NtfTknData {ntfTknId, token = DeviceToken pp _, tknStatus}, ntf) <- atomically (readTBQueue pushQ)
+  liftIO $ logDebug $ "sending push notification to " <> T.pack (show pp)
  status <- readTVarIO tknStatus
-  case (status, ntf) of
-    (_, PNVerification _) -> do
-      -- TODO check token status
-      deliverNotification pp tkn ntf
-      atomically $ modifyTVar tknStatus $ \status' -> if status' == NTActive then NTActive else NTConfirmed
-    (NTActive, PNCheckMessages) -> do
-      deliverNotification pp tkn ntf
-    _ -> do
-      logError "bad notification token status"
+  case ntf of
+    PNVerification _
+      | status /= NTInvalid && status /= NTExpired ->
+        deliverNotification pp tkn ntf >>= \case
+          Right _ -> do
+            status_ <- atomically $ stateTVar tknStatus $ \status' -> if status' == NTActive then (Nothing, NTActive) else (Just NTConfirmed, NTConfirmed)
+            forM_ status_ $ \status' -> withNtfLog $ \sl -> logTokenStatus sl ntfTknId status'
+          _ -> pure ()
+      | otherwise -> logError "bad notification token status"
+    PNCheckMessages -> checkActiveTkn status $ do
+      void $ deliverNotification pp tkn ntf
+    PNMessage {} -> checkActiveTkn status $ do
+      stats <- asks serverStats
+      atomically $ updatePeriodStats (activeTokens stats) ntfTknId
+      void $ deliverNotification pp tkn ntf
+      incNtfStat ntfDelivered
  where
-    deliverNotification :: PushProvider -> PushProviderClient
-    deliverNotification pp tkn ntf = do
+    checkActiveTkn :: NtfTknStatus -> M () -> M ()
+    checkActiveTkn status action
+      | status == NTActive = action
+      | otherwise = liftIO $ logError "bad notification token status"
+    deliverNotification :: PushProvider -> NtfTknData -> PushNotification -> M (Either PushProviderError ())
+    deliverNotification pp tkn@NtfTknData {ntfTknId, tknStatus} ntf = do
      deliver <- liftIO $ getPushClient s pp
-      -- TODO retry later based on the error
-      deliver tkn ntf `catchError` \e -> logError (T.pack $ "Push provider error (" <> show pp <> "): " <> show e) >> throwError e
+      liftIO (runExceptT $ deliver tkn ntf) >>= \case
+        Right _ -> pure $ Right ()
+        Left e -> case e of
+          PPConnection _ -> retryDeliver
+          PPRetryLater -> retryDeliver
+          PPCryptoError _ -> err e
+          PPResponseError _ _ -> err e
+          PPTokenInvalid -> updateTknStatus NTInvalid >> err e
+          PPPermanentError -> err e
+      where
+        retryDeliver :: M (Either PushProviderError ())
+        retryDeliver = do
+          deliver <- liftIO $ newPushClient s pp
+          liftIO (runExceptT $ deliver tkn ntf) >>= either err (pure . Right)
+        updateTknStatus :: NtfTknStatus -> M ()
+        updateTknStatus status = do
+          atomically $ writeTVar tknStatus status
+          withNtfLog $ \sl -> logTokenStatus sl ntfTknId status
+        err e = logError (T.pack $ "Push provider error (" <> show pp <> "): " <> show e) $> Left e

-runNtfClientTransport :: (Transport c, MonadUnliftIO m, MonadReader NtfEnv m) => THandle c -> m ()
+runNtfClientTransport :: Transport c => THandle c -> M ()
 runNtfClientTransport th@THandle {sessionId} = do
  qSize <- asks $ clientQSize . config
  ts <- liftIO getSystemTime
@@ -136,38 +309,41 @@ runNtfClientTransport th@THandle {sessionId} = do
  s <- asks subscriber
  ps <- asks pushServer
  expCfg <- asks $ inactiveClientExpiration . config
-  raceAny_ ([send th c, client c s ps, receive th c] <> disconnectThread_ c expCfg)
-    `finally` clientDisconnected c
+  raceAny_ ([liftIO $ send th c, client c s ps, receive th c] <> disconnectThread_ c expCfg)
+    `finally` liftIO (clientDisconnected c)
  where
-    disconnectThread_ c expCfg = maybe [] ((: []) . disconnectTransport th c activeAt) expCfg
+    disconnectThread_ c expCfg = maybe [] ((: []) . liftIO . disconnectTransport th c activeAt) expCfg

-clientDisconnected :: MonadUnliftIO m => NtfServerClient -> m ()
+clientDisconnected :: NtfServerClient -> IO ()
 clientDisconnected NtfServerClient {connected} = atomically $ writeTVar connected False

-receive :: (Transport c, MonadUnliftIO m, MonadReader NtfEnv m) => THandle c -> NtfServerClient -> m ()
+receive :: Transport c => THandle c -> NtfServerClient -> M ()
 receive th NtfServerClient {rcvQ, sndQ, activeAt} = forever $ do
-  t@(_, _, (corrId, entId, cmdOrError)) <- tGet th
-  atomically . writeTVar activeAt =<< liftIO getSystemTime
-  logDebug "received transmission"
-  case cmdOrError of
-    Left e -> write sndQ (corrId, entId, NRErr e)
-    Right cmd ->
-      verifyNtfTransmission t cmd >>= \case
-        VRVerified req -> write rcvQ req
-        VRFailed -> write sndQ (corrId, entId, NRErr AUTH)
+  ts <- tGet th
+  forM_ ts $ \t@(_, _, (corrId, entId, cmdOrError)) -> do
+    atomically . writeTVar activeAt =<< liftIO getSystemTime
+    logDebug "received transmission"
+    case cmdOrError of
+      Left e -> write sndQ (corrId, entId, NRErr e)
+      Right cmd ->
+        verifyNtfTransmission t cmd >>= \case
+          VRVerified req -> write rcvQ req
+          VRFailed -> write sndQ (corrId, entId, NRErr AUTH)
  where
    write q t = atomically $ writeTBQueue q t

-send :: (Transport c, MonadUnliftIO m) => THandle c -> NtfServerClient -> m ()
-send h NtfServerClient {sndQ, sessionId, activeAt} = forever $ do
+send :: Transport c => THandle c -> NtfServerClient -> IO ()
+send h@THandle {thVersion = v} NtfServerClient {sndQ, sessionId, activeAt} = forever $ do
  t <- atomically $ readTBQueue sndQ
-  void . liftIO $ tPut h (Nothing, encodeTransmission sessionId t)
+  void . liftIO $ tPut h [(Nothing, encodeTransmission v sessionId t)]
  atomically . writeTVar activeAt =<< liftIO getSystemTime

+-- instance Show a => Show (TVar a) where
+--   show x = unsafePerformIO $ show <$> readTVarIO x
+
 data VerificationResult = VRVerified NtfRequest | VRFailed

-verifyNtfTransmission ::
-  forall m. (MonadUnliftIO m, MonadReader NtfEnv m) => SignedTransmission NtfCmd -> NtfCmd -> m VerificationResult
+verifyNtfTransmission :: SignedTransmission NtfCmd -> NtfCmd -> M VerificationResult
 verifyNtfTransmission (sig_, signed, (corrId, entId, _)) cmd = do
  st <- asks store
  case cmd of
@@ -183,23 +359,48 @@ verifyNtfTransmission (sig_, signed, (corrId, entId, _)) cmd = do
          else VRFailed
    NtfCmd SToken c -> do
      t_ <- atomically $ getNtfToken st entId
-      pure $ case t_ of
-        Just t@NtfTknData {tknVerifyKey}
-          | verifyCmdSignature sig_ signed tknVerifyKey -> verifiedTknCmd t c
-          | otherwise -> VRFailed
-        _ -> maybe False (dummyVerifyCmd signed) sig_ `seq` VRFailed
-    _ -> pure VRFailed
+      verifyToken t_ (`verifiedTknCmd` c)
+    NtfCmd SSubscription c@(SNEW sub@(NewNtfSub tknId smpQueue _)) -> do
+      s_ <- atomically $ findNtfSubscription st smpQueue
+      case s_ of
+        Nothing -> do
+          t_ <- atomically $ getActiveNtfToken st tknId
+          verifyToken' t_ $ VRVerified (NtfReqNew corrId (ANE SSubscription sub))
+        Just s@NtfSubData {tokenId = subTknId} ->
+          if subTknId == tknId
+            then do
+              t_ <- atomically $ getActiveNtfToken st subTknId
+              verifyToken' t_ $ verifiedSubCmd s c
+            else pure $ maybe False (dummyVerifyCmd signed) sig_ `seq` VRFailed
+    NtfCmd SSubscription c -> do
+      s_ <- atomically $ getNtfSubscription st entId
+      case s_ of
+        Just s@NtfSubData {tokenId = subTknId} -> do
+          t_ <- atomically $ getActiveNtfToken st subTknId
+          verifyToken' t_ $ verifiedSubCmd s c
+        _ -> pure $ maybe False (dummyVerifyCmd signed) sig_ `seq` VRFailed
  where
    verifiedTknCmd t c = VRVerified (NtfReqCmd SToken (NtfTkn t) (corrId, entId, c))
+    verifiedSubCmd s c = VRVerified (NtfReqCmd SSubscription (NtfSub s) (corrId, entId, c))
+    verifyToken :: Maybe NtfTknData -> (NtfTknData -> VerificationResult) -> M VerificationResult
+    verifyToken t_ positiveVerificationResult =
+      pure $ case t_ of
+        Just t@NtfTknData {tknVerifyKey} ->
+          if verifyCmdSignature sig_ signed tknVerifyKey
+            then positiveVerificationResult t
+            else VRFailed
+        _ -> maybe False (dummyVerifyCmd signed) sig_ `seq` VRFailed
+    verifyToken' :: Maybe NtfTknData -> VerificationResult -> M VerificationResult
+    verifyToken' t_ = verifyToken t_ . const

-client :: forall m. (MonadUnliftIO m, MonadReader NtfEnv m) => NtfServerClient -> NtfSubscriber -> NtfPushServer -> m ()
-client NtfServerClient {rcvQ, sndQ} NtfSubscriber {subQ = _} NtfPushServer {pushQ, intervalNotifiers} =
+client :: NtfServerClient -> NtfSubscriber -> NtfPushServer -> M ()
+client NtfServerClient {rcvQ, sndQ} NtfSubscriber {newSubQ, smpAgent = ca} NtfPushServer {pushQ, intervalNotifiers} =
  forever $
    atomically (readTBQueue rcvQ)
      >>= processCommand
      >>= atomically . writeTBQueue sndQ
  where
-    processCommand :: NtfRequest -> m (Transmission NtfResponse)
+    processCommand :: NtfRequest -> M (Transmission NtfResponse)
    processCommand = \case
      NtfReqNew corrId (ANE SToken newTkn@(NewNtfTkn _ _ dhPubKey)) -> do
        logDebug "TNEW - new token"
@@ -208,12 +409,13 @@ client NtfServerClient {rcvQ, sndQ} NtfSubscriber {subQ = _} NtfPushServer {push
        let dhSecret = C.dh' dhPubKey srvDhPrivKey
        tknId <- getId
        regCode <- getRegCode
-        atomically $ do
-          tkn <- mkNtfTknData tknId newTkn ks dhSecret regCode
-          addNtfToken st tknId tkn
-          writeTBQueue pushQ (tkn, PNVerification regCode)
-        pure (corrId, "", NRId tknId srvDhPubKey)
-      NtfReqCmd SToken (NtfTkn tkn@NtfTknData {ntfTknId, tknStatus, tknRegCode, tknDhSecret, tknDhKeys = (srvDhPubKey, srvDhPrivKey)}) (corrId, tknId, cmd) -> do
+        tkn <- atomically $ mkNtfTknData tknId newTkn ks dhSecret regCode
+        atomically $ addNtfToken st tknId tkn
+        atomically $ writeTBQueue pushQ (tkn, PNVerification regCode)
+        withNtfLog (`logCreateToken` tkn)
+        incNtfStat tknCreated
+        pure (corrId, "", NRTknId tknId srvDhPubKey)
+      NtfReqCmd SToken (NtfTkn tkn@NtfTknData {ntfTknId, tknStatus, tknRegCode, tknDhSecret, tknDhKeys = (srvDhPubKey, srvDhPrivKey), tknCronInterval}) (corrId, tknId, cmd) -> do
        status <- readTVarIO tknStatus
        (corrId,tknId,) <$> case cmd of
          TNEW (NewNtfTkn _ _ dhPubKey) -> do
@@ -223,7 +425,7 @@ client NtfServerClient {rcvQ, sndQ} NtfSubscriber {subQ = _} NtfPushServer {push
            if tknDhSecret == dhSecret
              then do
                atomically $ writeTBQueue pushQ (tkn, PNVerification tknRegCode)
-                pure $ NRId ntfTknId srvDhPubKey
+                pure $ NRTknId ntfTknId srvDhPubKey
              else pure $ NRErr AUTH
          TVFY code -- this allows repeated verification for cases when client connection dropped before server response
            | (status == NTRegistered || status == NTConfirmed || status == NTActive) && tknRegCode == code -> do
@@ -232,31 +434,57 @@ client NtfServerClient {rcvQ, sndQ} NtfSubscriber {subQ = _} NtfPushServer {push
              atomically $ writeTVar tknStatus NTActive
              tIds <- atomically $ removeInactiveTokenRegistrations st tkn
              forM_ tIds cancelInvervalNotifications
+              withNtfLog $ \s -> logTokenStatus s tknId NTActive
+              incNtfStat tknVerified
              pure NROk
            | otherwise -> do
              logDebug "TVFY - incorrect code or token status"
              pure $ NRErr AUTH
-          TCHK -> pure $ NRTkn status
+          TCHK -> do
+            logDebug "TCHK"
+            pure $ NRTkn status
+          TRPL token' -> do
+            logDebug "TRPL - replace token"
+            st <- asks store
+            regCode <- getRegCode
+            atomically $ do
+              removeTokenRegistration st tkn
+              writeTVar tknStatus NTRegistered
+              let tkn' = tkn {token = token', tknRegCode = regCode}
+              addNtfToken st tknId tkn'
+              writeTBQueue pushQ (tkn', PNVerification regCode)
+            withNtfLog $ \s -> logUpdateToken s tknId token' regCode
+            incNtfStat tknDeleted
+            incNtfStat tknCreated
+            pure NROk
          TDEL -> do
            logDebug "TDEL"
            st <- asks store
-            atomically $ deleteNtfToken st tknId
+            qs <- atomically $ deleteNtfToken st tknId
+            forM_ qs $ \SMPQueueNtf {smpServer, notifierId} ->
+              atomically $ removeSubscription ca smpServer (SPNotifier, notifierId)
            cancelInvervalNotifications tknId
+            withNtfLog (`logDeleteToken` tknId)
+            incNtfStat tknDeleted
            pure NROk
          TCRN 0 -> do
            logDebug "TCRN 0"
+            atomically $ writeTVar tknCronInterval 0
            cancelInvervalNotifications tknId
+            withNtfLog $ \s -> logTokenCron s tknId 0
            pure NROk
          TCRN int
            | int < 20 -> pure $ NRErr QUOTA
            | otherwise -> do
              logDebug "TCRN"
+              atomically $ writeTVar tknCronInterval int
              atomically (TM.lookup tknId intervalNotifiers) >>= \case
                Nothing -> runIntervalNotifier int
                Just IntervalNotifier {interval, action} ->
                  unless (interval == int) $ do
                    uninterruptibleCancel action
                    runIntervalNotifier int
+              withNtfLog $ \s -> logTokenCron s tknId int
              pure NROk
            where
              runIntervalNotifier interval = do
@@ -267,64 +495,82 @@ client NtfServerClient {rcvQ, sndQ} NtfSubscriber {subQ = _} NtfPushServer {push
                  intervalNotifier delay = forever $ do
                    threadDelay delay
                    atomically $ writeTBQueue pushQ (tkn, PNCheckMessages)
-      NtfReqNew corrId (ANE SSubscription _newSub) -> pure (corrId, "", NROk)
-      NtfReqCmd SSubscription _sub (corrId, subId, cmd) ->
+      NtfReqNew corrId (ANE SSubscription newSub) -> do
+        logDebug "SNEW - new subscription"
+        st <- asks store
+        subId <- getId
+        sub <- atomically $ mkNtfSubData subId newSub
+        resp <-
+          atomically (addNtfSubscription st subId sub) >>= \case
+            Just _ -> atomically (writeTBQueue newSubQ $ NtfSub sub) $> NRSubId subId
+            _ -> pure $ NRErr AUTH
+        withNtfLog (`logCreateSubscription` sub)
+        incNtfStat subCreated
+        pure (corrId, "", resp)
+      NtfReqCmd SSubscription (NtfSub NtfSubData {smpQueue = SMPQueueNtf {smpServer, notifierId}, notifierKey = registeredNKey, subStatus}) (corrId, subId, cmd) -> do
+        status <- readTVarIO subStatus
        (corrId,subId,) <$> case cmd of
-          SNEW _newSub -> pure NROk
-          SCHK -> pure NROk
-          SDEL -> pure NROk
+          SNEW (NewNtfSub _ _ notifierKey) -> do
+            logDebug "SNEW - existing subscription"
+            -- possible improvement: retry if subscription failed, if pending or AUTH do nothing
+            pure $
+              if notifierKey == registeredNKey
+                then NRSubId subId
+                else NRErr AUTH
+          SCHK -> do
+            logDebug "SCHK"
+            pure $ NRSub status
+          SDEL -> do
+            logDebug "SDEL"
+            st <- asks store
+            atomically $ deleteNtfSubscription st subId
+            atomically $ removeSubscription ca smpServer (SPNotifier, notifierId)
+            withNtfLog (`logDeleteSubscription` subId)
+            incNtfStat subDeleted
+            pure NROk
          PING -> pure NRPong
-    getId :: m NtfEntityId
+    getId :: M NtfEntityId
    getId = getRandomBytes =<< asks (subIdBytes . config)
-    getRegCode :: m NtfRegCode
+    getRegCode :: M NtfRegCode
    getRegCode = NtfRegCode <$> (getRandomBytes =<< asks (regCodeBytes . config))
-    getRandomBytes :: Int -> m ByteString
+    getRandomBytes :: Int -> M ByteString
    getRandomBytes n = do
      gVar <- asks idsDrg
      atomically (C.pseudoRandomBytes n gVar)
-    cancelInvervalNotifications :: NtfTokenId -> m ()
+    cancelInvervalNotifications :: NtfTokenId -> M ()
    cancelInvervalNotifications tknId =
      atomically (TM.lookupDelete tknId intervalNotifiers)
        >>= mapM_ (uninterruptibleCancel . action)

-- NReqCreate corrId tokenId smpQueue -> pure (corrId, "", NROk)
-- do
-- st <- asks store
-- (pubDhKey, privDhKey) <- liftIO C.generateKeyPair'
-- let dhSecret = C.dh' dhPubKey privDhKey
-- sub <- atomically $ mkNtfSubsciption smpQueue token verifyKey dhSecret
-- addSubRetry 3 st sub >>= \case
--   Nothing -> pure (corrId, "", NRErr INTERNAL)
--   Just sId -> do
--     atomically $ writeTBQueue subQ sub
--     pure (corrId, sId, NRSubId pubDhKey)
-- where
--   addSubRetry :: Int -> NtfSubscriptionsStore -> NtfSubsciption -> m (Maybe NtfSubsciptionId)
--   addSubRetry 0 _ _ = pure Nothing
--   addSubRetry n st sub = do
--     sId <- getId
--     -- create QueueRec record with these ids and keys
--     atomically (addNtfSub st sId sub) >>= \case
--       Nothing -> addSubRetry (n - 1) st sub
--       _ -> pure $ Just sId
--   getId :: m NtfSubsciptionId
--   getId = do
--     n <- asks $ subIdBytes . config
--     gVar <- asks idsDrg
--     atomically (randomBytes n gVar)
-- NReqCommand sub@NtfSubsciption {tokenId, subStatus} (corrId, subId, cmd) ->
--   (corrId,subId,) <$> case cmd of
--     NCSubCreate tokenId smpQueue -> pure NROk
-- do
--   st <- asks store
--   (pubDhKey, privDhKey) <- liftIO C.generateKeyPair'
--   let dhSecret = C.dh' (dhPubKey newSub) privDhKey
--   atomically (updateNtfSub st sub newSub dhSecret) >>= \case
--     Nothing -> pure $ NRErr INTERNAL
--     _ -> atomically $ do
--       whenM ((== NSEnd) <$> readTVar status) $ writeTBQueue subQ sub
--       pure $ NRSubId pubDhKey
-- NCSubCheck -> NRStat <$> readTVarIO subStatus
-- NCSubDelete -> do
--   st <- asks store
--   atomically (deleteNtfSub st subId) $> NROk
+withNtfLog :: (StoreLog 'WriteMode -> IO a) -> M ()
+withNtfLog action = liftIO . mapM_ action =<< asks storeLog
+
+incNtfStat :: (NtfServerStats -> TVar Int) -> M ()
+incNtfStat statSel = do
+  stats <- asks serverStats
+  atomically $ modifyTVar' (statSel stats) (+ 1)
+
+saveServerStats :: M ()
+saveServerStats =
+  asks (serverStatsBackupFile . config)
+    >>= mapM_ (\f -> asks serverStats >>= atomically . getNtfServerStatsData >>= liftIO . saveStats f)
+  where
+    saveStats f stats = do
+      logInfo $ "saving server stats to file " <> T.pack f
+      B.writeFile f $ strEncode stats
+      logInfo "server stats saved"
+
+restoreServerStats :: M ()
+restoreServerStats = asks (serverStatsBackupFile . config) >>= mapM_ restoreStats
+  where
+    restoreStats f = whenM (doesFileExist f) $ do
+      logInfo $ "restoring server stats from file " <> T.pack f
+      liftIO (strDecode <$> B.readFile f) >>= \case
+        Right d -> do
+          s <- asks serverStats
+          atomically $ setNtfServerStats s d
+          renameFile f $ f <> ".bak"
+          logInfo "server stats restored"
+        Left e -> do
+          logInfo $ "error restoring server stats: " <> T.pack e
+          liftIO exitFailure
@@ -2,16 +2,16 @@
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE KindSignatures #-}
-{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}

 module Simplex.Messaging.Notifications.Server.Env where

+import Control.Concurrent (ThreadId)
 import Control.Concurrent.Async (Async)
-import Control.Monad (void)
 import Control.Monad.IO.Unlift
 import Crypto.Random
 import Data.ByteString.Char8 (ByteString)
+import Data.Time.Clock (getCurrentTime)
 import Data.Time.Clock.System (SystemTime)
 import Data.Word (Word16)
 import Data.X509.Validation (Fingerprint (..))
@@ -22,13 +22,17 @@ import Simplex.Messaging.Client.Agent
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Notifications.Protocol
 import Simplex.Messaging.Notifications.Server.Push.APNS
+import Simplex.Messaging.Notifications.Server.Stats
 import Simplex.Messaging.Notifications.Server.Store
-import Simplex.Messaging.Protocol (CorrId, Transmission)
+import Simplex.Messaging.Notifications.Server.StoreLog
+import Simplex.Messaging.Protocol (CorrId, SMPServer, Transmission)
 import Simplex.Messaging.Server.Expiration
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport (ATransport)
 import Simplex.Messaging.Transport.Server (loadFingerprint, loadTLSServerParams)
+import System.IO (IOMode (..))
+import System.Mem.Weak (Weak)
 import UnliftIO.STM

 data NtfServerConfig = NtfServerConfig
@@ -41,10 +45,18 @@ data NtfServerConfig = NtfServerConfig
    smpAgentCfg :: SMPClientAgentConfig,
    apnsConfig :: APNSPushClientConfig,
    inactiveClientExpiration :: Maybe ExpirationConfig,
+    storeLogFile :: Maybe FilePath,
+    resubscribeDelay :: Int, -- microseconds
    -- CA certificate private key is not needed for initialization
    caCertificateFile :: FilePath,
    privateKeyFile :: FilePath,
-    certificateFile :: FilePath
+    certificateFile :: FilePath,
+    -- stats config - see SMP server config
+    logStatsInterval :: Maybe Int,
+    logStatsStartTime :: Int,
+    serverStatsLogFile :: FilePath,
+    serverStatsBackupFile :: Maybe FilePath,
+    logTLSErrors :: Bool
  }

 defaultInactiveClientExpiration :: ExpirationConfig
@@ -59,34 +71,49 @@ data NtfEnv = NtfEnv
    subscriber :: NtfSubscriber,
    pushServer :: NtfPushServer,
    store :: NtfStore,
+    storeLog :: Maybe (StoreLog 'WriteMode),
    idsDrg :: TVar ChaChaDRG,
    serverIdentity :: C.KeyHash,
    tlsServerParams :: T.ServerParams,
-    serverIdentity :: C.KeyHash
+    serverIdentity :: C.KeyHash,
+    serverStats :: NtfServerStats
  }

 newNtfServerEnv :: (MonadUnliftIO m, MonadRandom m) => NtfServerConfig -> m NtfEnv
-newNtfServerEnv config@NtfServerConfig {subQSize, pushQSize, smpAgentCfg, apnsConfig, caCertificateFile, certificateFile, privateKeyFile} = do
+newNtfServerEnv config@NtfServerConfig {subQSize, pushQSize, smpAgentCfg, apnsConfig, storeLogFile, caCertificateFile, certificateFile, privateKeyFile} = do
  idsDrg <- newTVarIO =<< drgNew
  store <- atomically newNtfStore
+  storeLog <- liftIO $ mapM (`readWriteNtfStore` store) storeLogFile
  subscriber <- atomically $ newNtfSubscriber subQSize smpAgentCfg
  pushServer <- atomically $ newNtfPushServer pushQSize apnsConfig
-  -- TODO not creating APNS client on start to pass CI test, has to be replaced with mock APNS server
-  void . liftIO $ newPushClient pushServer PPApns
  tlsServerParams <- liftIO $ loadTLSServerParams caCertificateFile certificateFile privateKeyFile
  Fingerprint fp <- liftIO $ loadFingerprint caCertificateFile
-  pure NtfEnv {config, subscriber, pushServer, store, idsDrg, tlsServerParams, serverIdentity = C.KeyHash fp}
+  serverStats <- atomically . newNtfServerStats =<< liftIO getCurrentTime
+  pure NtfEnv {config, subscriber, pushServer, store, storeLog, idsDrg, tlsServerParams, serverIdentity = C.KeyHash fp, serverStats}

 data NtfSubscriber = NtfSubscriber
-  { subQ :: TBQueue (NtfEntityRec 'Subscription),
+  { smpSubscribers :: TMap SMPServer SMPSubscriber,
+    newSubQ :: TBQueue (NtfEntityRec 'Subscription),
    smpAgent :: SMPClientAgent
  }

 newNtfSubscriber :: Natural -> SMPClientAgentConfig -> STM NtfSubscriber
 newNtfSubscriber qSize smpAgentCfg = do
+  smpSubscribers <- TM.empty
+  newSubQ <- newTBQueue qSize
  smpAgent <- newSMPClientAgent smpAgentCfg
-  subQ <- newTBQueue qSize
-  pure NtfSubscriber {smpAgent, subQ}
+  pure NtfSubscriber {smpSubscribers, newSubQ, smpAgent}
+
+data SMPSubscriber = SMPSubscriber
+  { newSubQ :: TQueue (NtfEntityRec 'Subscription),
+    subThreadId :: TVar (Maybe (Weak ThreadId))
+  }
+
+newSMPSubscriber :: STM SMPSubscriber
+newSMPSubscriber = do
+  newSubQ <- newTQueue
+  subThreadId <- newTVar Nothing
+  pure SMPSubscriber {newSubQ, subThreadId}

 data NtfPushServer = NtfPushServer
  { pushQ :: TBQueue (NtfTknData, PushNotification),
@@ -109,11 +136,10 @@ newNtfPushServer qSize apnsConfig = do
  pure NtfPushServer {pushQ, pushClients, intervalNotifiers, apnsConfig}

 newPushClient :: NtfPushServer -> PushProvider -> IO PushProviderClient
-newPushClient NtfPushServer {apnsConfig, pushClients} = \case
-  PPApns -> do
-    c <- apnsPushProviderClient <$> createAPNSPushClient apnsConfig
-    atomically $ TM.insert PPApns c pushClients
-    pure c
+newPushClient NtfPushServer {apnsConfig, pushClients} pp = do
+  c <- apnsPushProviderClient <$> createAPNSPushClient (apnsProviderHost pp) apnsConfig
+  atomically $ TM.insert pp c pushClients
+  pure c

 getPushClient :: NtfPushServer -> PushProvider -> IO PushProviderClient
 getPushClient s@NtfPushServer {pushClients} pp =
@@ -0,0 +1,174 @@
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedLists #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PatternSynonyms #-}
+
+module Simplex.Messaging.Notifications.Server.Main where
+
+import Data.Either (fromRight)
+import Data.Functor (($>))
+import Data.Ini (lookupValue, readIniFile)
+import Data.Maybe (fromMaybe)
+import qualified Data.Text as T
+import Network.Socket (HostName)
+import Options.Applicative
+import Simplex.Messaging.Client.Agent (defaultSMPClientAgentConfig)
+import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Notifications.Server (runNtfServer)
+import Simplex.Messaging.Notifications.Server.Env (NtfServerConfig (..))
+import Simplex.Messaging.Notifications.Server.Push.APNS (defaultAPNSPushClientConfig)
+import Simplex.Messaging.Protocol (ProtoServerWithAuth (..), pattern NtfServer)
+import Simplex.Messaging.Server.CLI
+import Simplex.Messaging.Transport.Client (TransportHost (..))
+import System.Directory (createDirectoryIfMissing, doesFileExist)
+import System.FilePath (combine)
+import System.IO (BufferMode (..), hSetBuffering, stderr, stdout)
+import Text.Read (readMaybe)
+
+ntfServerVersion :: String
+ntfServerVersion = "1.3.0"
+
+ntfServerCLI :: FilePath -> FilePath -> IO ()
+ntfServerCLI cfgPath logPath =
+  getCliCommand' (cliCommandP cfgPath logPath iniFile) serverVersion >>= \case
+    Init opts ->
+      doesFileExist iniFile >>= \case
+        True -> exitError $ "Error: server is already initialized (" <> iniFile <> " exists).\nRun `" <> executableName <> " start`."
+        _ -> initializeServer opts
+    Start ->
+      doesFileExist iniFile >>= \case
+        True -> readIniFile iniFile >>= either exitError runServer
+        _ -> exitError $ "Error: server is not initialized (" <> iniFile <> " does not exist).\nRun `" <> executableName <> " init`."
+    Delete -> do
+      confirmOrExit "WARNING: deleting the server will make all queues inaccessible, because the server identity (certificate fingerprint) will change.\nTHIS CANNOT BE UNDONE!"
+      deleteDirIfExists cfgPath
+      deleteDirIfExists logPath
+      putStrLn "Deleted configuration and log files"
+  where
+    iniFile = combine cfgPath "ntf-server.ini"
+    serverVersion = "SMP notifications server v" <> ntfServerVersion
+    defaultServerPort = "443"
+    executableName = "ntf-server"
+    storeLogFilePath = combine logPath "ntf-server-store.log"
+    initializeServer InitOptions {enableStoreLog, signAlgorithm, ip, fqdn} = do
+      clearDirIfExists cfgPath
+      clearDirIfExists logPath
+      createDirectoryIfMissing True cfgPath
+      createDirectoryIfMissing True logPath
+      let x509cfg = defaultX509Config {commonName = fromMaybe ip fqdn, signAlgorithm}
+      fp <- createServerX509 cfgPath x509cfg
+      let host = fromMaybe (if ip == "127.0.0.1" then "<hostnames>" else ip) fqdn
+          srv = ProtoServerWithAuth (NtfServer [THDomainName host] "" (C.KeyHash fp)) Nothing
+      writeFile iniFile $ iniFileContent host
+      putStrLn $ "Server initialized, you can modify configuration in " <> iniFile <> ".\nRun `" <> executableName <> " start` to start server."
+      warnCAPrivateKeyFile cfgPath x509cfg
+      printServiceInfo serverVersion srv
+      where
+        iniFileContent host =
+          "[STORE_LOG]\n\
+          \# The server uses STM memory for persistence,\n\
+          \# that will be lost on restart (e.g., as with redis).\n\
+          \# This option enables saving memory to append only log,\n\
+          \# and restoring it when the server is started.\n\
+          \# Log is compacted on start (deleted objects are removed).\n"
+            <> ("enable: " <> onOff enableStoreLog <> "\n\n")
+            <> "log_stats: off\n\n\
+               \[TRANSPORT]\n\
+               \# host is only used to print server address on start\n"
+            <> ("host: " <> host <> "\n")
+            <> ("port: " <> defaultServerPort <> "\n")
+            <> "log_tls_errors: off\n\
+               \websockets: off\n"
+    runServer ini = do
+      hSetBuffering stdout LineBuffering
+      hSetBuffering stderr LineBuffering
+      fp <- checkSavedFingerprint cfgPath defaultX509Config
+      let host = fromRight "<hostnames>" $ T.unpack <$> lookupValue "TRANSPORT" "host" ini
+          port = T.unpack $ strictIni "TRANSPORT" "port" ini
+          cfg@NtfServerConfig {transports, storeLogFile} = serverConfig
+          srv = ProtoServerWithAuth (NtfServer [THDomainName host] (if port == "443" then "" else port) (C.KeyHash fp)) Nothing
+      printServiceInfo serverVersion srv
+      printServerConfig transports storeLogFile
+      runNtfServer cfg
+      where
+        enableStoreLog = settingIsOn "STORE_LOG" "enable" ini
+        logStats = settingIsOn "STORE_LOG" "log_stats" ini
+        c = combine cfgPath . ($ defaultX509Config)
+        serverConfig =
+          NtfServerConfig
+            { transports = iniTransports ini,
+              subIdBytes = 24,
+              regCodeBytes = 32,
+              clientQSize = 16,
+              subQSize = 64,
+              pushQSize = 128,
+              smpAgentCfg = defaultSMPClientAgentConfig,
+              apnsConfig = defaultAPNSPushClientConfig,
+              inactiveClientExpiration = Nothing,
+              storeLogFile = enableStoreLog $> storeLogFilePath,
+              resubscribeDelay = 50000, -- 50ms
+              caCertificateFile = c caCrtFile,
+              privateKeyFile = c serverKeyFile,
+              certificateFile = c serverCrtFile,
+              logStatsInterval = logStats $> 86400, -- seconds
+              logStatsStartTime = 0, -- seconds from 00:00 UTC
+              serverStatsLogFile = combine logPath "ntf-server-stats.daily.log",
+              serverStatsBackupFile = logStats $> combine logPath "ntf-server-stats.log",
+              logTLSErrors = fromMaybe False $ iniOnOff "TRANSPORT" "log_tls_errors" ini
+            }
+
+data CliCommand
+  = Init InitOptions
+  | Start
+  | Delete
+
+data InitOptions = InitOptions
+  { enableStoreLog :: Bool,
+    signAlgorithm :: SignAlgorithm,
+    ip :: HostName,
+    fqdn :: Maybe HostName
+  }
+  deriving (Show)
+
+cliCommandP :: FilePath -> FilePath -> FilePath -> Parser CliCommand
+cliCommandP cfgPath logPath iniFile =
+  hsubparser
+    ( command "init" (info (Init <$> initP) (progDesc $ "Initialize server - creates " <> cfgPath <> " and " <> logPath <> " directories and configuration files"))
+        <> command "start" (info (pure Start) (progDesc $ "Start server (configuration: " <> iniFile <> ")"))
+        <> command "delete" (info (pure Delete) (progDesc "Delete configuration and log files"))
+    )
+  where
+    initP :: Parser InitOptions
+    initP =
+      InitOptions
+        <$> switch
+          ( long "store-log"
+              <> short 'l'
+              <> help "Enable store log for persistence"
+          )
+        <*> option
+          (maybeReader readMaybe)
+          ( long "sign-algorithm"
+              <> short 'a'
+              <> help "Signature algorithm used for TLS certificates: ED25519, ED448"
+              <> value ED448
+              <> showDefault
+              <> metavar "ALG"
+          )
+        <*> strOption
+          ( long "ip"
+              <> help
+                "Server IP address, used as Common Name for TLS online certificate if FQDN is not supplied"
+              <> value "127.0.0.1"
+              <> showDefault
+              <> metavar "IP"
+          )
+        <*> (optional . strOption)
+          ( long "fqdn"
+              <> short 'n'
+              <> help "Server FQDN used as Common Name for TLS online certificate"
+              <> showDefault
+              <> metavar "FQDN"
+          )
@@ -10,6 +10,7 @@

 module Simplex.Messaging.Notifications.Server.Push.APNS where

+import Control.Exception (Exception)
 import Control.Logger.Simple
 import Control.Monad.Except
 import Crypto.Hash.Algorithms (SHA256 (..))
@@ -33,7 +34,6 @@ import Data.Int (Int64)
 import Data.Map.Strict (Map)
 import Data.Text (Text)
 import qualified Data.Text as T
-import Data.Text.Encoding (decodeUtf8With)
 import Data.Time.Clock.System
 import qualified Data.X509 as X
 import GHC.Generics (Generic)
@@ -46,8 +46,9 @@ import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Notifications.Protocol
 import Simplex.Messaging.Notifications.Server.Store (NtfTknData (..))
-import Simplex.Messaging.Protocol (NotifierId, SMPServer)
+import Simplex.Messaging.Protocol (EncNMsgMeta)
 import Simplex.Messaging.Transport.HTTP2.Client
+import Simplex.Messaging.Util (safeDecodeUtf8)
 import System.Environment (getEnv)
 import UnliftIO.STM

@@ -89,15 +90,31 @@ signedJWTToken pk (JWTToken hdr claims) = do

 readECPrivateKey :: FilePath -> IO EC.PrivateKey
 readECPrivateKey f = do
-  -- TODO this is specific to APNS key
+  -- this pattern match is specific to APNS key type, it may need to be extended for other push providers
  [PK.Unprotected (X.PrivKeyEC X.PrivKeyEC_Named {privkeyEC_name, privkeyEC_priv})] <- PK.readKeyFile f
  pure EC.PrivateKey {private_curve = ECT.getCurveByName privkeyEC_name, private_d = privkeyEC_priv}

 data PushNotification
  = PNVerification NtfRegCode
-  | PNMessage SMPServer NotifierId
-  | PNAlert Text
+  | PNMessage PNMessageData
+  -- | PNAlert Text
  | PNCheckMessages
+  deriving (Show)
+
+data PNMessageData = PNMessageData
+  { smpQueue :: SMPQueueNtf,
+    ntfTs :: SystemTime,
+    nmsgNonce :: C.CbNonce,
+    encNMsgMeta :: EncNMsgMeta
+  }
+  deriving (Show)
+
+instance StrEncoding PNMessageData where
+  strEncode PNMessageData {smpQueue, ntfTs, nmsgNonce, encNMsgMeta} =
+    strEncode (smpQueue, ntfTs, nmsgNonce, encNMsgMeta)
+  strP = do
+    (smpQueue, ntfTs, nmsgNonce, encNMsgMeta) <- strP
+    pure PNMessageData {smpQueue, ntfTs, nmsgNonce, encNMsgMeta}

 data APNSNotification = APNSNotification {aps :: APNSNotificationBody, notificationData :: Maybe J.Value}
  deriving (Show, Generic)
@@ -107,9 +124,9 @@ instance ToJSON APNSNotification where
  toEncoding = J.genericToEncoding J.defaultOptions {J.omitNothingFields = True}

 data APNSNotificationBody
-  = APNSAlert {alert :: APNSAlertBody, badge :: Maybe Int, sound :: Maybe Text, category :: Maybe Text}
-  | APNSBackground {contentAvailable :: Int}
+  = APNSBackground {contentAvailable :: Int}
  | APNSMutableContent {mutableContent :: Int, alert :: APNSAlertBody, category :: Maybe Text}
+  | APNSAlert {alert :: APNSAlertBody, badge :: Maybe Int, sound :: Maybe Text, category :: Maybe Text}
  deriving (Show, Generic)

 apnsJSONOptions :: J.Options
@@ -176,23 +193,27 @@ data APNSPushClientConfig = APNSPushClientConfig
    paddedNtfLength :: Int,
    appName :: ByteString,
    appTeamId :: Text,
-    apnsHost :: HostName,
    apnsPort :: ServiceName,
    http2cfg :: HTTP2ClientConfig
  }
  deriving (Show)

+apnsProviderHost :: PushProvider -> HostName
+apnsProviderHost = \case
+  PPApnsTest -> "localhost"
+  PPApnsDev -> "api.sandbox.push.apple.com"
+  PPApnsProd -> "api.push.apple.com"
+
 defaultAPNSPushClientConfig :: APNSPushClientConfig
 defaultAPNSPushClientConfig =
  APNSPushClientConfig
-    { tokenTTL = 1200, -- 20 minutes
+    { tokenTTL = 1800, -- 30 minutes
      authKeyFileEnv = "APNS_KEY_FILE", -- the environment variables APNS_KEY_FILE and APNS_KEY_ID must be set, or the server would fail to start
      authKeyAlg = "ES256",
      authKeyIdEnv = "APNS_KEY_ID",
-      paddedNtfLength = 256,
+      paddedNtfLength = 512,
      appName = "chat.simplex.app",
      appTeamId = "5NN7GUYB6T",
-      apnsHost = "api.sandbox.push.apple.com",
      apnsPort = "443",
      http2cfg = defaultHTTP2ClientConfig
    }
@@ -203,19 +224,20 @@ data APNSPushClient = APNSPushClient
    jwtHeader :: JWTHeader,
    jwtToken :: TVar (JWTToken, SignedJWTToken),
    nonceDrg :: TVar ChaChaDRG,
+    apnsHost :: HostName,
    apnsCfg :: APNSPushClientConfig
  }

-createAPNSPushClient :: APNSPushClientConfig -> IO APNSPushClient
-createAPNSPushClient apnsCfg@APNSPushClientConfig {authKeyFileEnv, authKeyAlg, authKeyIdEnv, appTeamId} = do
+createAPNSPushClient :: HostName -> APNSPushClientConfig -> IO APNSPushClient
+createAPNSPushClient apnsHost apnsCfg@APNSPushClientConfig {authKeyFileEnv, authKeyAlg, authKeyIdEnv, appTeamId} = do
  https2Client <- newTVarIO Nothing
-  void $ connectHTTPS2 apnsCfg https2Client
+  void $ connectHTTPS2 apnsHost apnsCfg https2Client
  privateKey <- readECPrivateKey =<< getEnv authKeyFileEnv
  authKeyId <- T.pack <$> getEnv authKeyIdEnv
  let jwtHeader = JWTHeader {alg = authKeyAlg, kid = authKeyId}
  jwtToken <- newTVarIO =<< mkApnsJWTToken appTeamId jwtHeader privateKey
  nonceDrg <- drgNew >>= newTVarIO
-  pure APNSPushClient {https2Client, privateKey, jwtHeader, jwtToken, nonceDrg, apnsCfg}
+  pure APNSPushClient {https2Client, privateKey, jwtHeader, jwtToken, nonceDrg, apnsHost, apnsCfg}

 getApnsJWTToken :: APNSPushClient -> IO SignedJWTToken
 getApnsJWTToken APNSPushClient {apnsCfg = APNSPushClientConfig {appTeamId, tokenTTL}, privateKey, jwtHeader, jwtToken} = do
@@ -236,8 +258,8 @@ mkApnsJWTToken appTeamId jwtHeader privateKey = do
  signedJWT <- signedJWTToken privateKey jwt
  pure (jwt, signedJWT)

-connectHTTPS2 :: APNSPushClientConfig -> TVar (Maybe HTTP2Client) -> IO (Either HTTP2ClientError HTTP2Client)
-connectHTTPS2 APNSPushClientConfig {apnsHost, apnsPort, http2cfg} https2Client = do
+connectHTTPS2 :: HostName -> APNSPushClientConfig -> TVar (Maybe HTTP2Client) -> IO (Either HTTP2ClientError HTTP2Client)
+connectHTTPS2 apnsHost APNSPushClientConfig {apnsPort, http2cfg} https2Client = do
  r <- getHTTP2Client apnsHost apnsPort http2cfg disconnected
  case r of
    Right client -> atomically . writeTVar https2Client $ Just client
@@ -247,30 +269,32 @@ connectHTTPS2 APNSPushClientConfig {apnsHost, apnsPort, http2cfg} https2Client =
    disconnected = atomically $ writeTVar https2Client Nothing

 getApnsHTTP2Client :: APNSPushClient -> IO (Either HTTP2ClientError HTTP2Client)
-getApnsHTTP2Client APNSPushClient {https2Client, apnsCfg} =
-  readTVarIO https2Client >>= maybe (connectHTTPS2 apnsCfg https2Client) (pure . Right)
+getApnsHTTP2Client APNSPushClient {https2Client, apnsHost, apnsCfg} =
+  readTVarIO https2Client >>= maybe (connectHTTPS2 apnsHost apnsCfg https2Client) (pure . Right)

 disconnectApnsHTTP2Client :: APNSPushClient -> IO ()
 disconnectApnsHTTP2Client APNSPushClient {https2Client} =
  readTVarIO https2Client >>= mapM_ closeHTTP2Client >> atomically (writeTVar https2Client Nothing)

+ntfCategoryCheckMessage :: Text
+ntfCategoryCheckMessage = "NTF_CAT_CHECK_MESSAGE"
+
 apnsNotification :: NtfTknData -> C.CbNonce -> Int -> PushNotification -> Either C.CryptoError APNSNotification
 apnsNotification NtfTknData {tknDhSecret} nonce paddedLen = \case
  PNVerification (NtfRegCode code) ->
    encrypt code $ \code' ->
-      apn APNSBackground {contentAvailable = 1} . Just $ J.object ["verification" .= code', "nonce" .= nonce]
-  PNMessage srv nId ->
-    encrypt (strEncode srv <> "/" <> strEncode nId) $ \ntfQueue ->
-      apn apnMutableContent . Just $ J.object ["checkMessage" .= ntfQueue, "nonce" .= nonce]
-  PNAlert text -> Right $ apn (apnAlert $ APNSAlertText text) Nothing
+      apn APNSBackground {contentAvailable = 1} . Just $ J.object ["nonce" .= nonce, "verification" .= code']
+  PNMessage pnMessageData ->
+    encrypt (strEncode pnMessageData) $ \ntfData ->
+      apn apnMutableContent . Just $ J.object ["nonce" .= nonce, "message" .= ntfData]
+  -- PNAlert text -> Right $ apn (apnAlert $ APNSAlertText text) Nothing
  PNCheckMessages -> Right $ apn APNSBackground {contentAvailable = 1} . Just $ J.object ["checkMessages" .= True]
  where
    encrypt :: ByteString -> (Text -> APNSNotification) -> Either C.CryptoError APNSNotification
    encrypt ntfData f = f . safeDecodeUtf8 . U.encode <$> C.cbEncrypt tknDhSecret nonce ntfData paddedLen
    apn aps notificationData = APNSNotification {aps, notificationData}
-    apnMutableContent = APNSMutableContent {mutableContent = 1, alert = APNSAlertText "Encrypted message or some other app event", category = Nothing}
-    apnAlert alert = APNSAlert {alert, badge = Nothing, sound = Nothing, category = Nothing}
-    safeDecodeUtf8 = decodeUtf8With onError where onError _ _ = Just '?'
+    apnMutableContent = APNSMutableContent {mutableContent = 1, alert = APNSAlertText "Encrypted message or another app event", category = Just ntfCategoryCheckMessage}
+    -- apnAlert alert = APNSAlert {alert, badge = Nothing, sound = Nothing, category = Nothing}

 apnsRequest :: APNSPushClient -> ByteString -> APNSNotification -> IO Request
 apnsRequest c tkn ntf@APNSNotification {aps} = do
@@ -298,7 +322,7 @@ data PushProviderError
  | PPTokenInvalid
  | PPRetryLater
  | PPPermanentError
-  deriving (Show)
+  deriving (Show, Exception)

 type PushProviderClient = NtfTknData -> PushNotification -> ExceptT PushProviderError IO ()

@@ -307,7 +331,7 @@ data APNSErrorResponse = APNSErrorResponse {reason :: Text}
  deriving (Generic, FromJSON)

 apnsPushProviderClient :: APNSPushClient -> PushProviderClient
-apnsPushProviderClient c@APNSPushClient {nonceDrg, apnsCfg} tkn@NtfTknData {token = DeviceToken PPApns tknStr} pn = do
+apnsPushProviderClient c@APNSPushClient {nonceDrg, apnsCfg} tkn@NtfTknData {token = DeviceToken _ tknStr} pn = do
  http2 <- liftHTTPS2 $ getApnsHTTP2Client c
  nonce <- atomically $ C.pseudoRandomCbNonce nonceDrg
  apnsNtf <- liftEither $ first PPCryptoError $ apnsNotification tkn nonce (paddedNtfLength apnsCfg) pn
@@ -333,7 +357,7 @@ apnsPushProviderClient c@APNSPushClient {nonceDrg, apnsCfg} tkn@NtfTknData {toke
        _ -> err status reason'
      | status == Just N.gone410 = throwError PPTokenInvalid
      | status == Just N.serviceUnavailable503 = liftIO (disconnectApnsHTTP2Client c) >> throwError PPRetryLater
-      -- Just tooManyRequests429 -> TODO TooManyRequests - too many requests for the same token
+      -- Just tooManyRequests429 -> TooManyRequests - too many requests for the same token
      | otherwise = err status reason'
    err :: Maybe Status -> Text -> ExceptT PushProviderError IO ()
    err s r = throwError $ PPResponseError s r
@@ -15,6 +15,12 @@ export JWT_HEADER_CLAIMS="${JWT_HEADER}.${JWT_CLAIMS}"
 export JWT_SIGNED_HEADER_CLAIMS=$(printf "${JWT_HEADER_CLAIMS}" | openssl dgst -binary -sha256 -sign "${APNS_KEY_FILE}" | openssl base64 -e -A | tr -- '+/' '-_' | tr -d =)
 export AUTHENTICATION_TOKEN="${JWT_HEADER}.${JWT_CLAIMS}.${JWT_SIGNED_HEADER_CLAIMS}"

-curl -v --header "apns-topic: $TOPIC" --header "apns-push-type: alert" --header "authorization: bearer $AUTHENTICATION_TOKEN" --data '{"aps":{"alert":"you have a new message"},"data":{"test":"123"}}' --http2 https://${APNS_HOST_NAME}/3/device/${DEVICE_TOKEN}
+# simple alert
+# curl -v --header "apns-topic: $TOPIC" --header "apns-push-type: alert" --header "authorization: bearer $AUTHENTICATION_TOKEN" --data '{"aps":{"alert":"you have a new message"},"data":{"test":"123"}}' --http2 https://${APNS_HOST_NAME}/3/device/${DEVICE_TOKEN}

+# background notification
 # curl -v --header "apns-topic: $TOPIC" --header "apns-push-type: background" --header "apns-priority: 5" --header "authorization: bearer $AUTHENTICATION_TOKEN" --data '{"aps":{"content-available":1}}' --http2 https://${APNS_HOST_NAME}/3/device/${DEVICE_TOKEN}
+
+# mutable-content notification
+# NTF_CAT_CHECK_MESSAGE category will not show alert if the app is in foreground
+curl -v --header "apns-topic: $TOPIC" --header "apns-push-type: alert" --header "authorization: bearer $AUTHENTICATION_TOKEN" --data '{"aps":{"category": "NTF_CAT_CHECK_MESSAGE__SECRET", "mutable-content": 1, "alert":"received encrypted message"}, "data": {"test":"123"}}' --http2 https://${APNS_HOST_NAME}/3/device/${DEVICE_TOKEN}
@@ -0,0 +1,113 @@
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Simplex.Messaging.Notifications.Server.Stats where
+
+import Control.Applicative (optional)
+import qualified Data.Attoparsec.ByteString.Char8 as A
+import qualified Data.ByteString.Char8 as B
+import Data.Time.Clock (UTCTime)
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Notifications.Protocol (NtfTokenId)
+import Simplex.Messaging.Protocol (NotifierId)
+import Simplex.Messaging.Server.Stats
+import UnliftIO.STM
+
+data NtfServerStats = NtfServerStats
+  { fromTime :: TVar UTCTime,
+    tknCreated :: TVar Int,
+    tknVerified :: TVar Int,
+    tknDeleted :: TVar Int,
+    subCreated :: TVar Int,
+    subDeleted :: TVar Int,
+    ntfReceived :: TVar Int,
+    ntfDelivered :: TVar Int,
+    activeTokens :: PeriodStats NtfTokenId,
+    activeSubs :: PeriodStats NotifierId
+  }
+
+data NtfServerStatsData = NtfServerStatsData
+  { _fromTime :: UTCTime,
+    _tknCreated :: Int,
+    _tknVerified :: Int,
+    _tknDeleted :: Int,
+    _subCreated :: Int,
+    _subDeleted :: Int,
+    _ntfReceived :: Int,
+    _ntfDelivered :: Int,
+    _activeTokens :: PeriodStatsData NtfTokenId,
+    _activeSubs :: PeriodStatsData NotifierId
+  }
+
+newNtfServerStats :: UTCTime -> STM NtfServerStats
+newNtfServerStats ts = do
+  fromTime <- newTVar ts
+  tknCreated <- newTVar 0
+  tknVerified <- newTVar 0
+  tknDeleted <- newTVar 0
+  subCreated <- newTVar 0
+  subDeleted <- newTVar 0
+  ntfReceived <- newTVar 0
+  ntfDelivered <- newTVar 0
+  activeTokens <- newPeriodStats
+  activeSubs <- newPeriodStats
+  pure NtfServerStats {fromTime, tknCreated, tknVerified, tknDeleted, subCreated, subDeleted, ntfReceived, ntfDelivered, activeTokens, activeSubs}
+
+getNtfServerStatsData :: NtfServerStats -> STM NtfServerStatsData
+getNtfServerStatsData s = do
+  _fromTime <- readTVar $ fromTime (s :: NtfServerStats)
+  _tknCreated <- readTVar $ tknCreated s
+  _tknVerified <- readTVar $ tknVerified s
+  _tknDeleted <- readTVar $ tknDeleted s
+  _subCreated <- readTVar $ subCreated s
+  _subDeleted <- readTVar $ subDeleted s
+  _ntfReceived <- readTVar $ ntfReceived s
+  _ntfDelivered <- readTVar $ ntfDelivered s
+  _activeTokens <- getPeriodStatsData $ activeTokens s
+  _activeSubs <- getPeriodStatsData $ activeSubs s
+  pure NtfServerStatsData {_fromTime, _tknCreated, _tknVerified, _tknDeleted, _subCreated, _subDeleted, _ntfReceived, _ntfDelivered, _activeTokens, _activeSubs}
+
+setNtfServerStats :: NtfServerStats -> NtfServerStatsData -> STM ()
+setNtfServerStats s d = do
+  writeTVar (fromTime (s :: NtfServerStats)) $! _fromTime (d :: NtfServerStatsData)
+  writeTVar (tknCreated s) $! _tknCreated d
+  writeTVar (tknVerified s) $! _tknVerified d
+  writeTVar (tknDeleted s) $! _tknDeleted d
+  writeTVar (subCreated s) $! _subCreated d
+  writeTVar (subDeleted s) $! _subDeleted d
+  writeTVar (ntfReceived s) $! _ntfReceived d
+  writeTVar (ntfDelivered s) $! _ntfDelivered d
+  setPeriodStats (activeTokens s) (_activeTokens d)
+  setPeriodStats (activeSubs s) (_activeSubs d)
+
+instance StrEncoding NtfServerStatsData where
+  strEncode NtfServerStatsData {_fromTime, _tknCreated, _tknVerified, _tknDeleted, _subCreated, _subDeleted, _ntfReceived, _ntfDelivered, _activeTokens, _activeSubs} =
+    B.unlines
+      [ "fromTime=" <> strEncode _fromTime,
+        "tknCreated=" <> strEncode _tknCreated,
+        "tknVerified=" <> strEncode _tknVerified,
+        "tknDeleted=" <> strEncode _tknDeleted,
+        "subCreated=" <> strEncode _subCreated,
+        "subDeleted=" <> strEncode _subDeleted,
+        "ntfReceived=" <> strEncode _ntfReceived,
+        "ntfDelivered=" <> strEncode _ntfDelivered,
+        "activeTokens:",
+        strEncode _activeTokens,
+        "activeSubs:",
+        strEncode _activeSubs
+      ]
+  strP = do
+    _fromTime <- "fromTime=" *> strP <* A.endOfLine
+    _tknCreated <- "tknCreated=" *> strP <* A.endOfLine
+    _tknVerified <- "tknVerified=" *> strP <* A.endOfLine
+    _tknDeleted <- "tknDeleted=" *> strP <* A.endOfLine
+    _subCreated <- "subCreated=" *> strP <* A.endOfLine
+    _subDeleted <- "subDeleted=" *> strP <* A.endOfLine
+    _ntfReceived <- "ntfReceived=" *> strP <* A.endOfLine
+    _ntfDelivered <- "ntfDelivered=" *> strP <* A.endOfLine
+    _ <- "activeTokens:" <* A.endOfLine
+    _activeTokens <- strP <* A.endOfLine
+    _ <- "activeSubs:" <* A.endOfLine
+    _activeSubs <- strP <* optional A.endOfLine
+    pure NtfServerStatsData {_fromTime, _tknCreated, _tknVerified, _tknDeleted, _subCreated, _subDeleted, _ntfReceived, _ntfDelivered, _activeTokens, _activeSubs}
@@ -6,30 +6,42 @@
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE TupleSections #-}

 module Simplex.Messaging.Notifications.Server.Store where

 import Control.Concurrent.STM
 import Control.Monad
 import Data.ByteString.Char8 (ByteString)
+import Data.Functor (($>))
 import qualified Data.Map.Strict as M
+import Data.Maybe (catMaybes)
+import Data.Set (Set)
+import qualified Data.Set as S
+import Data.Word (Word16)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Notifications.Protocol
+import Simplex.Messaging.Protocol (NtfPrivateSignKey)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Util (whenM, ($>>=))

 data NtfStore = NtfStore
  { tokens :: TMap NtfTokenId NtfTknData,
-    tokenRegistrations :: TMap DeviceToken (TMap ByteString NtfTokenId)
+    -- multiple registrations exist to protect from malicious registrations if token is compromised
+    tokenRegistrations :: TMap DeviceToken (TMap ByteString NtfTokenId),
+    subscriptions :: TMap NtfSubscriptionId NtfSubData,
+    tokenSubscriptions :: TMap NtfTokenId (TVar (Set NtfSubscriptionId)),
+    subscriptionLookup :: TMap SMPQueueNtf NtfSubscriptionId
  }

 newNtfStore :: STM NtfStore
 newNtfStore = do
  tokens <- TM.empty
  tokenRegistrations <- TM.empty
-  pure NtfStore {tokens, tokenRegistrations}
+  subscriptions <- TM.empty
+  tokenSubscriptions <- TM.empty
+  subscriptionLookup <- TM.empty
+  pure NtfStore {tokens, tokenRegistrations, subscriptions, tokenSubscriptions, subscriptionLookup}

 data NtfTknData = NtfTknData
  { ntfTknId :: NtfTokenId,
@@ -38,26 +50,20 @@ data NtfTknData = NtfTknData
    tknVerifyKey :: C.APublicVerifyKey,
    tknDhKeys :: C.KeyPair 'C.X25519,
    tknDhSecret :: C.DhSecretX25519,
-    tknRegCode :: NtfRegCode
+    tknRegCode :: NtfRegCode,
+    tknCronInterval :: TVar Word16
  }

 mkNtfTknData :: NtfTokenId -> NewNtfEntity 'Token -> C.KeyPair 'C.X25519 -> C.DhSecretX25519 -> NtfRegCode -> STM NtfTknData
 mkNtfTknData ntfTknId (NewNtfTkn token tknVerifyKey _) tknDhKeys tknDhSecret tknRegCode = do
  tknStatus <- newTVar NTRegistered
-  pure NtfTknData {ntfTknId, token, tknStatus, tknVerifyKey, tknDhKeys, tknDhSecret, tknRegCode}
-
-- data NtfSubscriptionsStore = NtfSubscriptionsStore
-
-- { subscriptions :: TMap NtfSubsciptionId NtfSubsciption,
--   activeSubscriptions :: TMap (SMPServer, NotifierId) NtfSubsciptionId
-- }
-- do
-- subscriptions <- newTVar M.empty
-- activeSubscriptions <- newTVar M.empty
-- pure NtfSubscriptionsStore {subscriptions, activeSubscriptions}
+  tknCronInterval <- newTVar 0
+  pure NtfTknData {ntfTknId, token, tknStatus, tknVerifyKey, tknDhKeys, tknDhSecret, tknRegCode, tknCronInterval}

 data NtfSubData = NtfSubData
-  { smpQueue :: SMPQueueNtf,
+  { ntfSubId :: NtfSubscriptionId,
+    smpQueue :: SMPQueueNtf,
+    notifierKey :: NtfPrivateSignKey,
    tokenId :: NtfTokenId,
    subStatus :: TVar NtfSubStatus
  }
@@ -100,56 +106,88 @@ removeInactiveTokenRegistrations st NtfTknData {ntfTknId = tId, token} =
      forM_ tIds $ \(regKey, tId') -> do
        TM.delete regKey tknRegs
        TM.delete tId' $ tokens st
+        void $ deleteTokenSubs st tId'
      pure $ map snd tIds

-deleteNtfToken :: NtfStore -> NtfTokenId -> STM ()
+removeTokenRegistration :: NtfStore -> NtfTknData -> STM ()
+removeTokenRegistration st NtfTknData {ntfTknId = tId, token, tknVerifyKey} =
+  TM.lookup token (tokenRegistrations st) >>= mapM_ removeReg
+  where
+    removeReg regs =
+      TM.lookup k regs
+        >>= mapM_ (\tId' -> when (tId == tId') $ TM.delete k regs)
+    k = C.toPubKey C.pubKeyBytes tknVerifyKey
+
+deleteNtfToken :: NtfStore -> NtfTokenId -> STM [SMPQueueNtf]
 deleteNtfToken st tknId = do
-  TM.lookupDelete tknId (tokens st)
-    >>= mapM_
-      ( \NtfTknData {token, tknVerifyKey} ->
-          TM.lookup token regs
-            >>= mapM_
-              ( \tIds -> do
-                  TM.delete (regKey tknVerifyKey) tIds
-                  whenM (TM.null tIds) $ TM.delete token regs
-              )
-      )
+  void $
+    TM.lookupDelete tknId (tokens st) $>>= \NtfTknData {token, tknVerifyKey} ->
+      TM.lookup token regs $>>= \tIds ->
+        TM.delete (regKey tknVerifyKey) tIds
+          >> whenM (TM.null tIds) (TM.delete token regs) $> Just ()
+  deleteTokenSubs st tknId
  where
    regs = tokenRegistrations st
    regKey = C.toPubKey C.pubKeyBytes

-- getNtfRec :: NtfStore -> SNtfEntity e -> NtfEntityId -> STM (Maybe (NtfEntityRec e))
-- getNtfRec st ent entId = case ent of
--   SToken -> NtfTkn <$$> TM.lookup entId (tokens st)
--   SSubscription -> pure Nothing
+deleteTokenSubs :: NtfStore -> NtfTokenId -> STM [SMPQueueNtf]
+deleteTokenSubs st tknId = do
+  qs <-
+    TM.lookupDelete tknId (tokenSubscriptions st)
+      >>= mapM (readTVar >=> mapM deleteSub . S.toList)
+  pure $ maybe [] catMaybes qs
+  where
+    deleteSub subId = do
+      TM.lookupDelete subId (subscriptions st)
+        $>>= \NtfSubData {smpQueue} ->
+          TM.delete smpQueue (subscriptionLookup st) $> Just smpQueue

-- getNtfVerifyKey :: NtfStore -> SNtfEntity e -> NtfEntityId -> STM (Maybe (NtfEntityRec e, C.APublicVerifyKey))
-- getNtfVerifyKey st ent entId =
--   getNtfRec st ent entId >>= \case
--     Just r@(NtfTkn NtfTknData {tknVerifyKey}) -> pure $ Just (r, tknVerifyKey)
--     Just r@(NtfSub NtfSubData {tokenId}) ->
--       getNtfRec st SToken tokenId >>= \case
--         Just (NtfTkn NtfTknData {tknVerifyKey}) -> pure $ Just (r, tknVerifyKey)
--         _ -> pure Nothing
--     _ -> pure Nothing
+getNtfSubscription :: NtfStore -> NtfSubscriptionId -> STM (Maybe NtfSubData)
+getNtfSubscription st subId =
+  TM.lookup subId (subscriptions st)

-- mkNtfSubsciption :: SMPQueueNtf -> NtfTokenId -> STM NtfSubsciption
-- mkNtfSubsciption smpQueue tokenId = do
--   subStatus <- newTVar NSNew
--   pure NtfSubsciption {smpQueue, tokenId, subStatus}
+findNtfSubscription :: NtfStore -> SMPQueueNtf -> STM (Maybe NtfSubData)
+findNtfSubscription st smpQueue = do
+  TM.lookup smpQueue (subscriptionLookup st)
+    $>>= \subId -> TM.lookup subId (subscriptions st)

-- getNtfSub :: NtfSubscriptionsStore -> NtfSubsciptionId -> STM (Maybe NtfSubsciption)
-- getNtfSub st subId = pure Nothing -- maybe (pure $ Left AUTH) (fmap Right . readTVar) . M.lookup subId . subscriptions =<< readTVar st
+findNtfSubscriptionToken :: NtfStore -> SMPQueueNtf -> STM (Maybe NtfTknData)
+findNtfSubscriptionToken st smpQueue = do
+  findNtfSubscription st smpQueue
+    $>>= \NtfSubData {tokenId} -> getActiveNtfToken st tokenId

-- getNtfSubViaSMPQueue :: NtfSubscriptionsStore -> SMPQueueNtf -> STM (Maybe NtfSubsciption)
-- getNtfSubViaSMPQueue st smpQueue = pure Nothing
+getActiveNtfToken :: NtfStore -> NtfTokenId -> STM (Maybe NtfTknData)
+getActiveNtfToken st tknId =
+  getNtfToken st tknId $>>= \tkn@NtfTknData {tknStatus} -> do
+    tStatus <- readTVar tknStatus
+    pure $ if tStatus == NTActive then Just tkn else Nothing

-- -- replace keeping status
-- updateNtfSub :: NtfSubscriptionsStore -> NtfSubsciption -> SMPQueueNtf -> NtfTokenId -> C.DhSecretX25519 -> STM (Maybe ())
-- updateNtfSub st sub smpQueue tokenId dhSecret = pure Nothing
+mkNtfSubData :: NtfSubscriptionId -> NewNtfEntity 'Subscription -> STM NtfSubData
+mkNtfSubData ntfSubId (NewNtfSub tokenId smpQueue notifierKey) = do
+  subStatus <- newTVar NSNew
+  pure NtfSubData {ntfSubId, smpQueue, tokenId, subStatus, notifierKey}

-- addNtfSub :: NtfSubscriptionsStore -> NtfSubsciptionId -> NtfSubsciption -> STM (Maybe ())
-- addNtfSub st subId sub = pure Nothing
+addNtfSubscription :: NtfStore -> NtfSubscriptionId -> NtfSubData -> STM (Maybe ())
+addNtfSubscription st subId sub@NtfSubData {smpQueue, tokenId} =
+  TM.lookup tokenId (tokenSubscriptions st) >>= maybe newTokenSub pure >>= insertSub
+  where
+    newTokenSub = do
+      ts <- newTVar S.empty
+      TM.insert tokenId ts $ tokenSubscriptions st
+      pure ts
+    insertSub ts = do
+      modifyTVar' ts $ S.insert subId
+      TM.insert subId sub $ subscriptions st
+      TM.insert smpQueue subId (subscriptionLookup st)
+      -- return Nothing if subscription existed before
+      pure $ Just ()

-- deleteNtfSub :: NtfSubscriptionsStore -> NtfSubsciptionId -> STM ()
-- deleteNtfSub st subId = pure ()
+deleteNtfSubscription :: NtfStore -> NtfSubscriptionId -> STM ()
+deleteNtfSubscription st subId = do
+  TM.lookupDelete subId (subscriptions st)
+    >>= mapM_
+      ( \NtfSubData {smpQueue, tokenId} -> do
+          TM.delete smpQueue $ subscriptionLookup st
+          ts_ <- TM.lookup tokenId (tokenSubscriptions st)
+          forM_ ts_ $ \ts -> modifyTVar' ts $ S.delete subId
+      )
@@ -0,0 +1,227 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Simplex.Messaging.Notifications.Server.StoreLog
+  ( StoreLog,
+    NtfStoreLogRecord (..),
+    readWriteNtfStore,
+    logCreateToken,
+    logTokenStatus,
+    logUpdateToken,
+    logTokenCron,
+    logDeleteToken,
+    logCreateSubscription,
+    logSubscriptionStatus,
+    logDeleteSubscription,
+    closeStoreLog,
+  )
+where
+
+import Control.Concurrent.STM
+import Control.Monad (void)
+import qualified Data.Attoparsec.ByteString.Char8 as A
+import qualified Data.ByteString.Char8 as B
+import Data.Word (Word16)
+import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Notifications.Protocol
+import Simplex.Messaging.Notifications.Server.Store
+import Simplex.Messaging.Protocol (NtfPrivateSignKey)
+import Simplex.Messaging.Server.StoreLog
+import Simplex.Messaging.Util (whenM)
+import System.Directory (doesFileExist, renameFile)
+import System.IO
+
+data NtfStoreLogRecord
+  = CreateToken NtfTknRec
+  | TokenStatus NtfTokenId NtfTknStatus
+  | UpdateToken NtfTokenId DeviceToken NtfRegCode
+  | TokenCron NtfTokenId Word16
+  | DeleteToken NtfTokenId
+  | CreateSubscription NtfSubRec
+  | SubscriptionStatus NtfSubscriptionId NtfSubStatus
+  | DeleteSubscription NtfSubscriptionId
+
+data NtfTknRec = NtfTknRec
+  { ntfTknId :: NtfTokenId,
+    token :: DeviceToken,
+    tknStatus :: NtfTknStatus,
+    tknVerifyKey :: C.APublicVerifyKey,
+    tknDhKeys :: C.KeyPair 'C.X25519,
+    tknDhSecret :: C.DhSecretX25519,
+    tknRegCode :: NtfRegCode,
+    tknCronInterval :: Word16
+  }
+
+mkTknData :: NtfTknRec -> STM NtfTknData
+mkTknData NtfTknRec {ntfTknId, token, tknStatus = status, tknVerifyKey, tknDhKeys, tknDhSecret, tknRegCode, tknCronInterval = cronInt} = do
+  tknStatus <- newTVar status
+  tknCronInterval <- newTVar cronInt
+  pure NtfTknData {ntfTknId, token, tknStatus, tknVerifyKey, tknDhKeys, tknDhSecret, tknRegCode, tknCronInterval}
+
+mkTknRec :: NtfTknData -> STM NtfTknRec
+mkTknRec NtfTknData {ntfTknId, token, tknStatus = status, tknVerifyKey, tknDhKeys, tknDhSecret, tknRegCode, tknCronInterval = cronInt} = do
+  tknStatus <- readTVar status
+  tknCronInterval <- readTVar cronInt
+  pure NtfTknRec {ntfTknId, token, tknStatus, tknVerifyKey, tknDhKeys, tknDhSecret, tknRegCode, tknCronInterval}
+
+data NtfSubRec = NtfSubRec
+  { ntfSubId :: NtfSubscriptionId,
+    smpQueue :: SMPQueueNtf,
+    notifierKey :: NtfPrivateSignKey,
+    tokenId :: NtfTokenId,
+    subStatus :: NtfSubStatus
+  }
+
+mkSubData :: NtfSubRec -> STM NtfSubData
+mkSubData NtfSubRec {ntfSubId, smpQueue, notifierKey, tokenId, subStatus = status} = do
+  subStatus <- newTVar status
+  pure NtfSubData {ntfSubId, smpQueue, notifierKey, tokenId, subStatus}
+
+mkSubRec :: NtfSubData -> STM NtfSubRec
+mkSubRec NtfSubData {ntfSubId, smpQueue, notifierKey, tokenId, subStatus = status} = do
+  subStatus <- readTVar status
+  pure NtfSubRec {ntfSubId, smpQueue, notifierKey, tokenId, subStatus}
+
+instance StrEncoding NtfStoreLogRecord where
+  strEncode = \case
+    CreateToken tknRec -> strEncode (Str "TCREATE", tknRec)
+    TokenStatus tknId tknStatus -> strEncode (Str "TSTATUS", tknId, tknStatus)
+    UpdateToken tknId token regCode -> strEncode (Str "TUPDATE", tknId, token, regCode)
+    TokenCron tknId cronInt -> strEncode (Str "TCRON", tknId, cronInt)
+    DeleteToken tknId -> strEncode (Str "TDELETE", tknId)
+    CreateSubscription subRec -> strEncode (Str "SCREATE", subRec)
+    SubscriptionStatus subId subStatus -> strEncode (Str "SSTATUS", subId, subStatus)
+    DeleteSubscription subId -> strEncode (Str "SDELETE", subId)
+  strP =
+    A.choice
+      [ "TCREATE " *> (CreateToken <$> strP),
+        "TSTATUS " *> (TokenStatus <$> strP_ <*> strP),
+        "TUPDATE " *> (UpdateToken <$> strP_ <*> strP_ <*> strP),
+        "TCRON " *> (TokenCron <$> strP_ <*> strP),
+        "TDELETE " *> (DeleteToken <$> strP),
+        "SCREATE " *> (CreateSubscription <$> strP),
+        "SSTATUS " *> (SubscriptionStatus <$> strP_ <*> strP),
+        "SDELETE " *> (DeleteSubscription <$> strP)
+      ]
+
+instance StrEncoding NtfTknRec where
+  strEncode NtfTknRec {ntfTknId, token, tknStatus, tknVerifyKey, tknDhKeys, tknDhSecret, tknRegCode, tknCronInterval} =
+    B.unwords
+      [ "tknId=" <> strEncode ntfTknId,
+        "token=" <> strEncode token,
+        "tokenStatus=" <> strEncode tknStatus,
+        "verifyKey=" <> strEncode tknVerifyKey,
+        "dhKeys=" <> strEncode tknDhKeys,
+        "dhSecret=" <> strEncode tknDhSecret,
+        "regCode=" <> strEncode tknRegCode,
+        "cron=" <> strEncode tknCronInterval
+      ]
+  strP = do
+    ntfTknId <- "tknId=" *> strP_
+    token <- "token=" *> strP_
+    tknStatus <- "tokenStatus=" *> strP_
+    tknVerifyKey <- "verifyKey=" *> strP_
+    tknDhKeys <- "dhKeys=" *> strP_
+    tknDhSecret <- "dhSecret=" *> strP_
+    tknRegCode <- "regCode=" *> strP_
+    tknCronInterval <- "cron=" *> strP
+    pure NtfTknRec {ntfTknId, token, tknStatus, tknVerifyKey, tknDhKeys, tknDhSecret, tknRegCode, tknCronInterval}
+
+instance StrEncoding NtfSubRec where
+  strEncode NtfSubRec {ntfSubId, smpQueue, notifierKey, tokenId, subStatus} =
+    B.unwords
+      [ "subId=" <> strEncode ntfSubId,
+        "smpQueue=" <> strEncode smpQueue,
+        "notifierKey=" <> strEncode notifierKey,
+        "tknId=" <> strEncode tokenId,
+        "subStatus=" <> strEncode subStatus
+      ]
+  strP = do
+    ntfSubId <- "subId=" *> strP_
+    smpQueue <- "smpQueue=" *> strP_
+    notifierKey <- "notifierKey=" *> strP_
+    tokenId <- "tknId=" *> strP_
+    subStatus <- "subStatus=" *> strP
+    pure NtfSubRec {ntfSubId, smpQueue, notifierKey, tokenId, subStatus}
+
+logNtfStoreRecord :: StoreLog 'WriteMode -> NtfStoreLogRecord -> IO ()
+logNtfStoreRecord = writeStoreLogRecord
+
+logCreateToken :: StoreLog 'WriteMode -> NtfTknData -> IO ()
+logCreateToken s tkn = logNtfStoreRecord s . CreateToken =<< atomically (mkTknRec tkn)
+
+logTokenStatus :: StoreLog 'WriteMode -> NtfTokenId -> NtfTknStatus -> IO ()
+logTokenStatus s tknId tknStatus = logNtfStoreRecord s $ TokenStatus tknId tknStatus
+
+logUpdateToken :: StoreLog 'WriteMode -> NtfTokenId -> DeviceToken -> NtfRegCode -> IO ()
+logUpdateToken s tknId token regCode = logNtfStoreRecord s $ UpdateToken tknId token regCode
+
+logTokenCron :: StoreLog 'WriteMode -> NtfTokenId -> Word16 -> IO ()
+logTokenCron s tknId cronInt = logNtfStoreRecord s $ TokenCron tknId cronInt
+
+logDeleteToken :: StoreLog 'WriteMode -> NtfTokenId -> IO ()
+logDeleteToken s tknId = logNtfStoreRecord s $ DeleteToken tknId
+
+logCreateSubscription :: StoreLog 'WriteMode -> NtfSubData -> IO ()
+logCreateSubscription s sub = logNtfStoreRecord s . CreateSubscription =<< atomically (mkSubRec sub)
+
+logSubscriptionStatus :: StoreLog 'WriteMode -> NtfSubscriptionId -> NtfSubStatus -> IO ()
+logSubscriptionStatus s subId subStatus = logNtfStoreRecord s $ SubscriptionStatus subId subStatus
+
+logDeleteSubscription :: StoreLog 'WriteMode -> NtfSubscriptionId -> IO ()
+logDeleteSubscription s subId = logNtfStoreRecord s $ DeleteSubscription subId
+
+readWriteNtfStore :: FilePath -> NtfStore -> IO (StoreLog 'WriteMode)
+readWriteNtfStore f st = do
+  whenM (doesFileExist f) $ do
+    readNtfStore f st
+    renameFile f $ f <> ".bak"
+  s <- openWriteStoreLog f
+  writeNtfStore s st
+  pure s
+
+readNtfStore :: FilePath -> NtfStore -> IO ()
+readNtfStore f st = mapM_ addNtfLogRecord . B.lines =<< B.readFile f
+  where
+    addNtfLogRecord s = case strDecode s of
+      Left e -> B.putStrLn $ "Log parsing error (" <> B.pack e <> "): " <> B.take 100 s
+      Right lr -> atomically $ case lr of
+        CreateToken r@NtfTknRec {ntfTknId} -> do
+          tkn <- mkTknData r
+          addNtfToken st ntfTknId tkn
+        TokenStatus tknId status ->
+          getNtfToken st tknId
+            >>= mapM_ (\NtfTknData {tknStatus} -> writeTVar tknStatus status)
+        UpdateToken tknId token' tknRegCode ->
+          getNtfToken st tknId
+            >>= mapM_
+              ( \tkn@NtfTknData {tknStatus} -> do
+                  removeTokenRegistration st tkn
+                  writeTVar tknStatus NTRegistered
+                  addNtfToken st tknId tkn {token = token', tknRegCode}
+              )
+        TokenCron tknId cronInt ->
+          getNtfToken st tknId
+            >>= mapM_ (\NtfTknData {tknCronInterval} -> writeTVar tknCronInterval cronInt)
+        DeleteToken tknId ->
+          void $ deleteNtfToken st tknId
+        CreateSubscription r@NtfSubRec {ntfSubId} -> do
+          sub <- mkSubData r
+          void $ addNtfSubscription st ntfSubId sub
+        SubscriptionStatus subId status ->
+          getNtfSubscription st subId
+            >>= mapM_ (\NtfSubData {subStatus} -> writeTVar subStatus status)
+        DeleteSubscription subId ->
+          deleteNtfSubscription st subId
+
+writeNtfStore :: StoreLog 'WriteMode -> NtfStore -> IO ()
+writeNtfStore s NtfStore {tokens, subscriptions} = do
+  atomically (readTVar tokens >>= mapM mkTknRec)
+    >>= mapM_ (writeStoreLogRecord s . CreateToken)
+  atomically (readTVar subscriptions >>= mapM mkSubRec)
+    >>= mapM_ (writeStoreLogRecord s . CreateSubscription)
@@ -1,19 +1,72 @@
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+
 module Simplex.Messaging.Notifications.Transport where

 import Control.Monad.Except
 import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Encoding
 import Simplex.Messaging.Transport
+import Simplex.Messaging.Version

 ntfBlockSize :: Int
 ntfBlockSize = 512

+supportedNTFServerVRange :: VersionRange
+supportedNTFServerVRange = mkVersionRange 1 1
+
+data NtfServerHandshake = NtfServerHandshake
+  { ntfVersionRange :: VersionRange,
+    sessionId :: SessionId
+  }
+
+data NtfClientHandshake = NtfClientHandshake
+  { -- | agreed SMP notifications server protocol version
+    ntfVersion :: Version,
+    -- | server identity - CA certificate fingerprint
+    keyHash :: C.KeyHash
+  }
+
+instance Encoding NtfServerHandshake where
+  smpEncode NtfServerHandshake {ntfVersionRange, sessionId} =
+    smpEncode (ntfVersionRange, sessionId)
+  smpP = do
+    (ntfVersionRange, sessionId) <- smpP
+    pure NtfServerHandshake {ntfVersionRange, sessionId}
+
+instance Encoding NtfClientHandshake where
+  smpEncode NtfClientHandshake {ntfVersion, keyHash} = smpEncode (ntfVersion, keyHash)
+  smpP = do
+    (ntfVersion, keyHash) <- smpP
+    pure NtfClientHandshake {ntfVersion, keyHash}
+
 -- | Notifcations server transport handshake.
-ntfServerHandshake :: Transport c => c -> C.KeyHash -> ExceptT TransportError IO (THandle c)
-ntfServerHandshake c _ = pure $ ntfTHandle c
+ntfServerHandshake :: forall c. Transport c => c -> C.KeyHash -> VersionRange -> ExceptT TransportError IO (THandle c)
+ntfServerHandshake c kh ntfVRange = do
+  let th@THandle {sessionId} = ntfTHandle c
+  sendHandshake th $ NtfServerHandshake {sessionId, ntfVersionRange = ntfVRange}
+  getHandshake th >>= \case
+    NtfClientHandshake {ntfVersion, keyHash}
+      | keyHash /= kh ->
+        throwError $ TEHandshake IDENTITY
+      | ntfVersion `isCompatible` ntfVRange -> do
+        pure (th :: THandle c) {thVersion = ntfVersion}
+      | otherwise -> throwError $ TEHandshake VERSION

 -- | Notifcations server client transport handshake.
-ntfClientHandshake :: Transport c => c -> C.KeyHash -> ExceptT TransportError IO (THandle c)
-ntfClientHandshake c _ = pure $ ntfTHandle c
+ntfClientHandshake :: forall c. Transport c => c -> C.KeyHash -> VersionRange -> ExceptT TransportError IO (THandle c)
+ntfClientHandshake c keyHash ntfVRange = do
+  let th@THandle {sessionId} = ntfTHandle c
+  NtfServerHandshake {sessionId = sessId, ntfVersionRange} <- getHandshake th
+  if sessionId /= sessId
+    then throwError TEBadSession
+    else case ntfVersionRange `compatibleVersion` ntfVRange of
+      Just (Compatible ntfVersion) -> do
+        sendHandshake th $ NtfClientHandshake {ntfVersion, keyHash}
+        pure (th :: THandle c) {thVersion = ntfVersion}
+      Nothing -> throwError $ TEHandshake VERSION

 ntfTHandle :: Transport c => c -> THandle c
-ntfTHandle c = THandle {connection = c, sessionId = tlsUnique c, blockSize = ntfBlockSize, thVersion = 0}
+ntfTHandle c = THandle {connection = c, sessionId = tlsUnique c, blockSize = ntfBlockSize, thVersion = 0, batch = False}
@@ -0,0 +1,197 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Simplex.Messaging.Notifications.Types where
+
+import qualified Data.Attoparsec.ByteString.Char8 as A
+import Data.Text.Encoding (decodeLatin1, encodeUtf8)
+import Data.Time (UTCTime)
+import Database.SQLite.Simple.FromField (FromField (..))
+import Database.SQLite.Simple.ToField (ToField (..))
+import Simplex.Messaging.Agent.Protocol (ConnId, NotificationsMode (..))
+import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Encoding
+import Simplex.Messaging.Notifications.Protocol
+import Simplex.Messaging.Parsers (blobFieldDecoder, fromTextField_)
+import Simplex.Messaging.Protocol (NotifierId, NtfServer, SMPServer)
+
+data NtfTknAction
+  = NTARegister
+  | NTAVerify NtfRegCode -- code to verify token
+  | NTACheck
+  | NTADelete
+  deriving (Show)
+
+instance Encoding NtfTknAction where
+  smpEncode = \case
+    NTARegister -> "R"
+    NTAVerify code -> smpEncode ('V', code)
+    NTACheck -> "C"
+    NTADelete -> "D"
+  smpP =
+    A.anyChar >>= \case
+      'R' -> pure NTARegister
+      'V' -> NTAVerify <$> smpP
+      'C' -> pure NTACheck
+      'D' -> pure NTADelete
+      _ -> fail "bad NtfTknAction"
+
+instance FromField NtfTknAction where fromField = blobFieldDecoder smpDecode
+
+instance ToField NtfTknAction where toField = toField . smpEncode
+
+data NtfToken = NtfToken
+  { deviceToken :: DeviceToken,
+    ntfServer :: NtfServer,
+    ntfTokenId :: Maybe NtfTokenId,
+    -- | key used by the ntf server to verify transmissions
+    ntfPubKey :: C.APublicVerifyKey,
+    -- | key used by the ntf client to sign transmissions
+    ntfPrivKey :: C.APrivateSignKey,
+    -- | client's DH keys (to repeat registration if necessary)
+    ntfDhKeys :: C.KeyPair 'C.X25519,
+    -- | shared DH secret used to encrypt/decrypt notifications e2e
+    ntfDhSecret :: Maybe C.DhSecretX25519,
+    -- | token status
+    ntfTknStatus :: NtfTknStatus,
+    -- | pending token action and the earliest time
+    ntfTknAction :: Maybe NtfTknAction,
+    ntfMode :: NotificationsMode
+  }
+  deriving (Show)
+
+newNtfToken :: DeviceToken -> NtfServer -> C.ASignatureKeyPair -> C.KeyPair 'C.X25519 -> NotificationsMode -> NtfToken
+newNtfToken deviceToken ntfServer (ntfPubKey, ntfPrivKey) ntfDhKeys ntfMode =
+  NtfToken
+    { deviceToken,
+      ntfServer,
+      ntfTokenId = Nothing,
+      ntfPubKey,
+      ntfPrivKey,
+      ntfDhKeys,
+      ntfDhSecret = Nothing,
+      ntfTknStatus = NTNew,
+      ntfTknAction = Just NTARegister,
+      ntfMode
+    }
+
+data NtfSubAction = NtfSubNTFAction NtfSubNTFAction | NtfSubSMPAction NtfSubSMPAction
+  deriving (Show)
+
+isDeleteNtfSubAction :: NtfSubAction -> Bool
+isDeleteNtfSubAction = \case
+  NtfSubNTFAction a -> case a of
+    NSACreate -> False
+    NSACheck -> False
+    NSADelete -> True
+    NSARotate -> True
+  NtfSubSMPAction a -> case a of
+    NSASmpKey -> False
+    NSASmpDelete -> True
+
+type NtfActionTs = UTCTime
+
+data NtfSubNTFAction
+  = NSACreate
+  | NSACheck
+  | NSADelete
+  | NSARotate
+  deriving (Show)
+
+instance Encoding NtfSubNTFAction where
+  smpEncode = \case
+    NSACreate -> "N"
+    NSACheck -> "C"
+    NSADelete -> "D"
+    NSARotate -> "R"
+  smpP =
+    A.anyChar >>= \case
+      'N' -> pure NSACreate
+      'C' -> pure NSACheck
+      'D' -> pure NSADelete
+      'R' -> pure NSARotate
+      _ -> fail "bad NtfSubNTFAction"
+
+instance FromField NtfSubNTFAction where fromField = blobFieldDecoder smpDecode
+
+instance ToField NtfSubNTFAction where toField = toField . smpEncode
+
+data NtfSubSMPAction
+  = NSASmpKey
+  | NSASmpDelete
+  deriving (Show)
+
+instance Encoding NtfSubSMPAction where
+  smpEncode = \case
+    NSASmpKey -> "K"
+    NSASmpDelete -> "D"
+  smpP =
+    A.anyChar >>= \case
+      'K' -> pure NSASmpKey
+      'D' -> pure NSASmpDelete
+      _ -> fail "bad NtfSubSMPAction"
+
+instance FromField NtfSubSMPAction where fromField = blobFieldDecoder smpDecode
+
+instance ToField NtfSubSMPAction where toField = toField . smpEncode
+
+data NtfAgentSubStatus
+  = -- | subscription started
+    NASNew
+  | -- | state after NKEY - notifier ID is assigned to queue on SMP server
+    NASKey
+  | -- | state after SNEW - subscription created on notification server
+    NASCreated NtfSubStatus
+  | -- | state after SDEL (subscription is deleted on notification server)
+    NASOff
+  | -- | state after NDEL (notifier credentials are deleted on SMP server)
+    -- Can only exist transiently - if subscription record was updated by notification supervisor mid worker operation,
+    -- and hence got updated instead of being fully deleted in the database post operation by worker
+    NASDeleted
+  deriving (Eq, Show)
+
+instance Encoding NtfAgentSubStatus where
+  smpEncode = \case
+    NASNew -> "NEW"
+    NASKey -> "KEY"
+    NASCreated status -> "CREATED " <> smpEncode status
+    NASOff -> "OFF"
+    NASDeleted -> "DELETED"
+  smpP =
+    A.takeTill (== ' ') >>= \case
+      "NEW" -> pure NASNew
+      "KEY" -> pure NASKey
+      "CREATED" -> do
+        _ <- A.space
+        NASCreated <$> smpP
+      "OFF" -> pure NASOff
+      "DELETED" -> pure NASDeleted
+      _ -> fail "bad NtfAgentSubStatus"
+
+instance FromField NtfAgentSubStatus where fromField = fromTextField_ $ either (const Nothing) Just . smpDecode . encodeUtf8
+
+instance ToField NtfAgentSubStatus where toField = toField . decodeLatin1 . smpEncode
+
+data NtfSubscription = NtfSubscription
+  { connId :: ConnId,
+    smpServer :: SMPServer,
+    ntfQueueId :: Maybe NotifierId,
+    ntfServer :: NtfServer,
+    ntfSubId :: Maybe NtfSubscriptionId,
+    ntfSubStatus :: NtfAgentSubStatus
+  }
+  deriving (Show)
+
+newNtfSubscription :: ConnId -> SMPServer -> Maybe NotifierId -> NtfServer -> NtfAgentSubStatus -> NtfSubscription
+newNtfSubscription connId smpServer ntfQueueId ntfServer ntfSubStatus =
+  NtfSubscription
+    { connId,
+      smpServer,
+      ntfQueueId,
+      ntfServer,
+      ntfSubId = Nothing,
+      ntfSubStatus
+    }
@@ -118,6 +118,7 @@ taggedObjectJSON :: (String -> String) -> J.Options
 taggedObjectJSON tagModifier =
  J.defaultOptions
    { J.sumEncoding = J.TaggedObject "type" "data",
+      J.tagSingleConstructors = True,
      J.constructorTagModifier = tagModifier,
      J.allNullaryToStringTag = False,
      J.nullaryToObject = True,
@@ -128,6 +129,7 @@ singleFieldJSON :: (String -> String) -> J.Options
 singleFieldJSON tagModifier =
  J.defaultOptions
    { J.sumEncoding = J.ObjectWithSingleField,
+      J.tagSingleConstructors = True,
      J.constructorTagModifier = tagModifier,
      J.allNullaryToStringTag = False,
      J.nullaryToObject = True,
@@ -7,6 +7,7 @@
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedLists #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE PolyKinds #-}
@@ -16,9 +17,13 @@
 {-# LANGUAGE TupleSections #-}
 {-# LANGUAGE TypeApplications #-}
 {-# LANGUAGE TypeFamilyDependencies #-}
+{-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-}
+{-# OPTIONS_GHC -Wno-unrecognised-pragmas #-}
 {-# OPTIONS_GHC -fno-warn-unticked-promoted-constructors #-}

+{-# HLINT ignore "Use newtype instead of data" #-}
+
 -- |
 -- Module      : Simplex.Messaging.ProtocolEncoding
 -- Copyright   : (c) simplex.chat
@@ -33,8 +38,7 @@
 -- See https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md
 module Simplex.Messaging.Protocol
  ( -- * SMP protocol parameters
-    smpClientVersion,
-    smpClientVRange,
+    supportedSMPClientVRange,
    maxMessageLength,
    e2eEncConfirmationLength,
    e2eEncMessageLength,
@@ -59,9 +63,18 @@ module Simplex.Messaging.Protocol
    ClientMessage (..),
    PrivHeader (..),
    Protocol (..),
+    ProtocolType (..),
+    AProtocolType (..),
+    ProtocolTypeI (..),
    ProtocolServer (..),
+    ProtoServer,
    SMPServer,
    pattern SMPServer,
+    SMPServerWithAuth,
+    NtfServer,
+    pattern NtfServer,
+    ProtoServerWithAuth (..),
+    BasicAuth (..),
    SrvLoc (..),
    CorrId (..),
    QueueId,
@@ -76,8 +89,23 @@ module Simplex.Messaging.Protocol
    SndPublicVerifyKey,
    NtfPrivateSignKey,
    NtfPublicVerifyKey,
+    RcvNtfPublicDhKey,
+    RcvNtfDhSecret,
+    Message (..),
+    RcvMessage (..),
    MsgId,
    MsgBody,
+    MaxMessageLen,
+    MaxRcvMessageLen,
+    EncRcvMsgBody (..),
+    RcvMsgBody (..),
+    ClientRcvMsgBody (..),
+    EncNMsgMeta,
+    SMPMsgMeta (..),
+    NMsgMeta (..),
+    MsgFlags (..),
+    rcvMessageMeta,
+    noMsgFlags,

    -- * Parse and serialize
    ProtocolMsgTag (..),
@@ -85,6 +113,14 @@ module Simplex.Messaging.Protocol
    encodeTransmission,
    transmissionP,
    _smpP,
+    encodeRcvMsgBody,
+    clientRcvMsgBodyP,
+    legacyEncodeServer,
+    legacyServerP,
+    legacyStrEncodeServer,
+    sameSrvAddr,
+    sameSrvAddr',
+    noAuthSrv,

    -- * TCP transport functions
    tPut,
@@ -98,18 +134,23 @@ where

 import Control.Applicative (optional, (<|>))
 import Control.Monad.Except
-import Data.Aeson (ToJSON (..))
+import Data.Aeson (FromJSON (..), ToJSON (..))
 import qualified Data.Aeson as J
 import Data.Attoparsec.ByteString.Char8 (Parser)
 import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
+import Data.Char (isPrint, isSpace)
+import Data.Functor (($>))
 import Data.Kind
-import Data.Maybe (isNothing)
+import Data.List.NonEmpty (NonEmpty (..))
+import qualified Data.List.NonEmpty as L
+import Data.Maybe (isJust, isNothing)
 import Data.String
-import Data.Time.Clock.System (SystemTime)
+import Data.Time.Clock.System (SystemTime (..))
 import Data.Type.Equality
 import GHC.Generics (Generic)
+import GHC.TypeLits (type (+))
 import Generic.Random (genericArbitraryU)
 import Network.Socket (HostName, ServiceName)
 import qualified Simplex.Messaging.Crypto as C
@@ -117,19 +158,25 @@ import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers
 import Simplex.Messaging.Transport
+import Simplex.Messaging.Transport.Client (TransportHost, TransportHosts (..))
 import Simplex.Messaging.Util (bshow, (<$?>))
 import Simplex.Messaging.Version
 import Test.QuickCheck (Arbitrary (..))

-smpClientVersion :: Version
-smpClientVersion = 1
+currentSMPClientVersion :: Version
+currentSMPClientVersion = 2

-smpClientVRange :: VersionRange
-smpClientVRange = mkVersionRange 1 smpClientVersion
+supportedSMPClientVRange :: VersionRange
+supportedSMPClientVRange = mkVersionRange 1 currentSMPClientVersion

 maxMessageLength :: Int
 maxMessageLength = 16088

+type MaxMessageLen = 16088
+
+-- 16 extra bytes: 8 for timestamp and 8 for flags (7 flags and the space, only 1 flag is currently used)
+type MaxRcvMessageLen = MaxMessageLen + 16 -- 16104, the padded size is 16106
+
 -- it is shorter to allow per-queue e2e encryption DH key in the "public" header
 e2eEncConfirmationLength :: Int
 e2eEncConfirmationLength = 15936
@@ -210,15 +257,21 @@ type EntityId = ByteString
 -- | Parameterized type for SMP protocol commands from all clients.
 data Command (p :: Party) where
  -- SMP recipient commands
-  NEW :: RcvPublicVerifyKey -> RcvPublicDhKey -> Command Recipient
+  NEW :: RcvPublicVerifyKey -> RcvPublicDhKey -> Maybe BasicAuth -> Command Recipient
  SUB :: Command Recipient
  KEY :: SndPublicVerifyKey -> Command Recipient
-  NKEY :: NtfPublicVerifyKey -> Command Recipient
-  ACK :: Command Recipient
+  NKEY :: NtfPublicVerifyKey -> RcvNtfPublicDhKey -> Command Recipient
+  NDEL :: Command Recipient
+  GET :: Command Recipient
+  -- ACK v1 has to be supported for encoding/decoding
+  -- ACK :: Command Recipient
+  ACK :: MsgId -> Command Recipient
  OFF :: Command Recipient
  DEL :: Command Recipient
  -- SMP sender commands
-  SEND :: MsgBody -> Command Sender
+  -- SEND v1 has to be supported for encoding/decoding
+  -- SEND :: MsgBody -> Command Sender
+  SEND :: MsgFlags -> MsgBody -> Command Sender
  PING :: Command Sender
  -- SMP notification subscriber commands
  NSUB :: Command Notifier
@@ -230,15 +283,174 @@ deriving instance Eq (Command p)
 data BrokerMsg where
  -- SMP broker messages (responses, client messages, notifications)
  IDS :: QueueIdsKeys -> BrokerMsg
-  MSG :: MsgId -> SystemTime -> MsgBody -> BrokerMsg
-  NID :: NotifierId -> BrokerMsg
-  NMSG :: BrokerMsg
+  -- MSG v1/2 has to be supported for encoding/decoding
+  -- v1: MSG :: MsgId -> SystemTime -> MsgBody -> BrokerMsg
+  -- v2: MsgId -> SystemTime -> MsgFlags -> MsgBody -> BrokerMsg
+  MSG :: RcvMessage -> BrokerMsg
+  NID :: NotifierId -> RcvNtfPublicDhKey -> BrokerMsg
+  NMSG :: C.CbNonce -> EncNMsgMeta -> BrokerMsg
  END :: BrokerMsg
  OK :: BrokerMsg
  ERR :: ErrorType -> BrokerMsg
  PONG :: BrokerMsg
  deriving (Eq, Show)

+data RcvMessage = RcvMessage
+  { msgId :: MsgId,
+    msgTs :: SystemTime,
+    msgFlags :: MsgFlags,
+    msgBody :: EncRcvMsgBody -- e2e encrypted, with extra encryption for recipient
+  }
+  deriving (Eq, Show)
+
+-- | received message without server/recipient encryption
+data Message
+  = Message
+      { msgId :: MsgId,
+        msgTs :: SystemTime,
+        msgFlags :: MsgFlags,
+        msgBody :: C.MaxLenBS MaxMessageLen
+      }
+  | MessageQuota
+      { msgId :: MsgId,
+        msgTs :: SystemTime
+      }
+
+instance StrEncoding RcvMessage where
+  strEncode RcvMessage {msgId, msgTs, msgFlags, msgBody = EncRcvMsgBody body} =
+    B.unwords
+      [ strEncode msgId,
+        strEncode msgTs,
+        "flags=" <> strEncode msgFlags,
+        strEncode body
+      ]
+  strP = do
+    msgId <- strP_
+    msgTs <- strP_
+    msgFlags <- ("flags=" *> strP_) <|> pure noMsgFlags
+    msgBody <- EncRcvMsgBody <$> strP
+    pure RcvMessage {msgId, msgTs, msgFlags, msgBody}
+
+newtype EncRcvMsgBody = EncRcvMsgBody ByteString
+  deriving (Eq, Show)
+
+data RcvMsgBody
+  = RcvMsgBody
+      { msgTs :: SystemTime,
+        msgFlags :: MsgFlags,
+        msgBody :: C.MaxLenBS MaxMessageLen
+      }
+  | RcvMsgQuota
+      { msgTs :: SystemTime
+      }
+
+msgQuotaTag :: ByteString
+msgQuotaTag = "QUOTA"
+
+encodeRcvMsgBody :: RcvMsgBody -> C.MaxLenBS MaxRcvMessageLen
+encodeRcvMsgBody = \case
+  RcvMsgBody {msgTs, msgFlags, msgBody} ->
+    let rcvMeta :: C.MaxLenBS 16 = C.unsafeMaxLenBS $ smpEncode (msgTs, msgFlags, ' ')
+     in C.appendMaxLenBS rcvMeta msgBody
+  RcvMsgQuota {msgTs} ->
+    C.unsafeMaxLenBS $ msgQuotaTag <> " " <> smpEncode msgTs
+
+data ClientRcvMsgBody
+  = ClientRcvMsgBody
+      { msgTs :: SystemTime,
+        msgFlags :: MsgFlags,
+        msgBody :: ByteString
+      }
+  | ClientRcvMsgQuota
+      { msgTs :: SystemTime
+      }
+
+clientRcvMsgBodyP :: Parser ClientRcvMsgBody
+clientRcvMsgBodyP = msgQuotaP <|> msgBodyP
+  where
+    msgQuotaP = A.string msgQuotaTag *> (ClientRcvMsgQuota <$> _smpP)
+    msgBodyP = do
+      msgTs <- smpP
+      msgFlags <- smpP
+      Tail msgBody <- _smpP
+      pure ClientRcvMsgBody {msgTs, msgFlags, msgBody}
+
+instance StrEncoding Message where
+  strEncode = \case
+    Message {msgId, msgTs, msgFlags, msgBody} ->
+      B.unwords
+        [ strEncode msgId,
+          strEncode msgTs,
+          "flags=" <> strEncode msgFlags,
+          strEncode msgBody
+        ]
+    MessageQuota {msgId, msgTs} ->
+      B.unwords
+        [ strEncode msgId,
+          strEncode msgTs,
+          "quota"
+        ]
+  strP = do
+    msgId <- strP_
+    msgTs <- strP_
+    msgQuotaP msgId msgTs <|> msgP msgId msgTs
+    where
+      msgQuotaP msgId msgTs = "quota" $> MessageQuota {msgId, msgTs}
+      msgP msgId msgTs = do
+        msgFlags <- ("flags=" *> strP_) <|> pure noMsgFlags
+        msgBody <- strP
+        pure Message {msgId, msgTs, msgFlags, msgBody}
+
+type EncNMsgMeta = ByteString
+
+data SMPMsgMeta = SMPMsgMeta
+  { msgId :: MsgId,
+    msgTs :: SystemTime,
+    msgFlags :: MsgFlags
+  }
+  deriving (Show)
+
+rcvMessageMeta :: MsgId -> ClientRcvMsgBody -> SMPMsgMeta
+rcvMessageMeta msgId = \case
+  ClientRcvMsgBody {msgTs, msgFlags} -> SMPMsgMeta {msgId, msgTs, msgFlags}
+  ClientRcvMsgQuota {msgTs} -> SMPMsgMeta {msgId, msgTs, msgFlags = noMsgFlags}
+
+data NMsgMeta = NMsgMeta
+  { msgId :: MsgId,
+    msgTs :: SystemTime
+  }
+  deriving (Show)
+
+instance Encoding NMsgMeta where
+  smpEncode NMsgMeta {msgId, msgTs} =
+    smpEncode (msgId, msgTs)
+  smpP = do
+    -- Tail here is to allow extension in the future clients/servers
+    (msgId, msgTs, Tail _) <- smpP
+    pure NMsgMeta {msgId, msgTs}
+
+-- it must be data for correct JSON encoding
+data MsgFlags = MsgFlags {notification :: Bool}
+  deriving (Eq, Show, Generic)
+
+instance ToJSON MsgFlags where toEncoding = J.genericToEncoding J.defaultOptions
+
+-- this encoding should not become bigger than 7 bytes (currently it is 1 byte)
+instance Encoding MsgFlags where
+  smpEncode MsgFlags {notification} = smpEncode notification
+  smpP = do
+    notification <- smpP <* A.takeTill (== ' ')
+    pure MsgFlags {notification}
+
+instance StrEncoding MsgFlags where
+  strEncode = smpEncode
+  {-# INLINE strEncode #-}
+  strP = smpP
+  {-# INLINE strP #-}
+
+noMsgFlags :: MsgFlags
+noMsgFlags = MsgFlags {notification = False}
+
 -- * SMP command tags

 data CommandTag (p :: Party) where
@@ -246,6 +458,8 @@ data CommandTag (p :: Party) where
  SUB_ :: CommandTag Recipient
  KEY_ :: CommandTag Recipient
  NKEY_ :: CommandTag Recipient
+  NDEL_ :: CommandTag Recipient
+  GET_ :: CommandTag Recipient
  ACK_ :: CommandTag Recipient
  OFF_ :: CommandTag Recipient
  DEL_ :: CommandTag Recipient
@@ -284,6 +498,8 @@ instance PartyI p => Encoding (CommandTag p) where
    SUB_ -> "SUB"
    KEY_ -> "KEY"
    NKEY_ -> "NKEY"
+    NDEL_ -> "NDEL"
+    GET_ -> "GET"
    ACK_ -> "ACK"
    OFF_ -> "OFF"
    DEL_ -> "DEL"
@@ -298,6 +514,8 @@ instance ProtocolMsgTag CmdTag where
    "SUB" -> Just $ CT SRecipient SUB_
    "KEY" -> Just $ CT SRecipient KEY_
    "NKEY" -> Just $ CT SRecipient NKEY_
+    "NDEL" -> Just $ CT SRecipient NDEL_
+    "GET" -> Just $ CT SRecipient GET_
    "ACK" -> Just $ CT SRecipient ACK_
    "OFF" -> Just $ CT SRecipient OFF_
    "DEL" -> Just $ CT SRecipient DEL_
@@ -383,44 +601,201 @@ instance Encoding ClientMessage where
  smpEncode (ClientMessage h msg) = smpEncode h <> msg
  smpP = ClientMessage <$> smpP <*> A.takeByteString

-type SMPServer = ProtocolServer
+type SMPServer = ProtocolServer 'PSMP

-pattern SMPServer :: HostName -> ServiceName -> C.KeyHash -> ProtocolServer
-pattern SMPServer host port keyHash = ProtocolServer host port keyHash
+pattern SMPServer :: NonEmpty TransportHost -> ServiceName -> C.KeyHash -> ProtocolServer 'PSMP
+pattern SMPServer host port keyHash = ProtocolServer SPSMP host port keyHash

 {-# COMPLETE SMPServer #-}

-- | SMP server location and transport key digest (hash).
-data ProtocolServer = ProtocolServer
-  { host :: HostName,
+type SMPServerWithAuth = ProtoServerWithAuth 'PSMP
+
+type NtfServer = ProtocolServer 'PNTF
+
+pattern NtfServer :: NonEmpty TransportHost -> ServiceName -> C.KeyHash -> ProtocolServer 'PNTF
+pattern NtfServer host port keyHash = ProtocolServer SPNTF host port keyHash
+
+{-# COMPLETE NtfServer #-}
+
+sameSrvAddr' :: ProtoServerWithAuth p -> ProtoServerWithAuth p -> Bool
+sameSrvAddr' (ProtoServerWithAuth srv _) (ProtoServerWithAuth srv' _) = sameSrvAddr srv srv'
+{-# INLINE sameSrvAddr' #-}
+
+sameSrvAddr :: ProtocolServer p -> ProtocolServer p -> Bool
+sameSrvAddr ProtocolServer {host, port} ProtocolServer {host = h', port = p'} = host == h' && port == p'
+{-# INLINE sameSrvAddr #-}
+
+data ProtocolType = PSMP | PNTF
+  deriving (Eq, Ord, Show)
+
+instance StrEncoding ProtocolType where
+  strEncode = \case
+    PSMP -> "smp"
+    PNTF -> "ntf"
+  strP =
+    A.takeTill (\c -> c == ':' || c == ' ') >>= \case
+      "smp" -> pure PSMP
+      "ntf" -> pure PNTF
+      _ -> fail "bad ProtocolType"
+
+data SProtocolType (p :: ProtocolType) where
+  SPSMP :: SProtocolType 'PSMP
+  SPNTF :: SProtocolType 'PNTF
+
+deriving instance Eq (SProtocolType p)
+
+deriving instance Ord (SProtocolType p)
+
+deriving instance Show (SProtocolType p)
+
+data AProtocolType = forall p. ProtocolTypeI p => AProtocolType (SProtocolType p)
+
+deriving instance Show AProtocolType
+
+instance Eq AProtocolType where
+  AProtocolType p == AProtocolType p' = isJust $ testEquality p p'
+
+instance TestEquality SProtocolType where
+  testEquality SPSMP SPSMP = Just Refl
+  testEquality SPNTF SPNTF = Just Refl
+  testEquality _ _ = Nothing
+
+protocolType :: SProtocolType p -> ProtocolType
+protocolType = \case
+  SPSMP -> PSMP
+  SPNTF -> PNTF
+
+aProtocolType :: ProtocolType -> AProtocolType
+aProtocolType = \case
+  PSMP -> AProtocolType SPSMP
+  PNTF -> AProtocolType SPNTF
+
+instance ProtocolTypeI p => StrEncoding (SProtocolType p) where
+  strEncode = strEncode . protocolType
+  strP = (\(AProtocolType p) -> checkProtocolType p) <$?> strP
+
+instance StrEncoding AProtocolType where
+  strEncode (AProtocolType p) = strEncode p
+  strP = aProtocolType <$> strP
+
+instance ToJSON AProtocolType where
+  toEncoding = strToJEncoding
+  toJSON = strToJSON
+
+checkProtocolType :: forall t p p'. (ProtocolTypeI p, ProtocolTypeI p') => t p' -> Either String (t p)
+checkProtocolType p = case testEquality (protocolTypeI @p) (protocolTypeI @p') of
+  Just Refl -> Right p
+  Nothing -> Left "bad ProtocolType"
+
+class ProtocolTypeI (p :: ProtocolType) where
+  protocolTypeI :: SProtocolType p
+
+instance ProtocolTypeI 'PSMP where protocolTypeI = SPSMP
+
+instance ProtocolTypeI 'PNTF where protocolTypeI = SPNTF
+
+-- | server location and transport key digest (hash).
+data ProtocolServer p = ProtocolServer
+  { scheme :: SProtocolType p,
+    host :: NonEmpty TransportHost,
    port :: ServiceName,
    keyHash :: C.KeyHash
  }
  deriving (Eq, Ord, Show)

-instance IsString ProtocolServer where
+instance ProtocolTypeI p => IsString (ProtocolServer p) where
  fromString = parseString strDecode

-instance Encoding ProtocolServer where
+instance ProtocolTypeI p => Encoding (ProtocolServer p) where
  smpEncode ProtocolServer {host, port, keyHash} =
    smpEncode (host, port, keyHash)
  smpP = do
    (host, port, keyHash) <- smpP
-    pure ProtocolServer {host, port, keyHash}
+    pure ProtocolServer {scheme = protocolTypeI @p, host, port, keyHash}

-instance StrEncoding ProtocolServer where
-  strEncode ProtocolServer {host, port, keyHash} =
-    "smp://" <> strEncode keyHash <> "@" <> strEncode (SrvLoc host port)
-  strP = do
-    _ <- "smp://"
-    keyHash <- strP <* A.char '@'
-    SrvLoc host port <- strP
-    pure ProtocolServer {host, port, keyHash}
+instance ProtocolTypeI p => StrEncoding (ProtocolServer p) where
+  strEncode ProtocolServer {scheme, host, port, keyHash} =
+    strEncodeServer scheme (strEncode host) port keyHash Nothing
+  strP =
+    serverStrP >>= \case
+      (srv, Nothing) -> pure srv
+      _ -> fail "ProtocolServer with basic auth not allowed"

-instance ToJSON ProtocolServer where
+instance ProtocolTypeI p => ToJSON (ProtocolServer p) where
  toJSON = strToJSON
  toEncoding = strToJEncoding

+newtype BasicAuth = BasicAuth {unBasicAuth :: ByteString}
+  deriving (Eq, Show)
+
+instance IsString BasicAuth where fromString = BasicAuth . B.pack
+
+instance Encoding BasicAuth where
+  smpEncode (BasicAuth s) = smpEncode s
+  smpP = basicAuth <$?> smpP
+
+instance StrEncoding BasicAuth where
+  strEncode (BasicAuth s) = s
+  strP = basicAuth <$?> A.takeWhile1 (/= '@')
+
+basicAuth :: ByteString -> Either String BasicAuth
+basicAuth s
+  | B.all valid s = Right $ BasicAuth s
+  | otherwise = Left "invalid character in BasicAuth"
+  where
+    valid c = isPrint c && not (isSpace c) && c /= '@' && c /= ':' && c /= '/'
+
+data ProtoServerWithAuth p = ProtoServerWithAuth (ProtocolServer p) (Maybe BasicAuth)
+  deriving (Show)
+
+instance ProtocolTypeI p => IsString (ProtoServerWithAuth p) where
+  fromString = parseString strDecode
+
+instance ProtocolTypeI p => StrEncoding (ProtoServerWithAuth p) where
+  strEncode (ProtoServerWithAuth ProtocolServer {scheme, host, port, keyHash} auth_) =
+    strEncodeServer scheme (strEncode host) port keyHash auth_
+  strP = uncurry ProtoServerWithAuth <$> serverStrP
+
+instance ProtocolTypeI p => ToJSON (ProtoServerWithAuth p) where
+  toJSON = strToJSON
+  toEncoding = strToJEncoding
+
+instance ProtocolTypeI p => FromJSON (ProtoServerWithAuth p) where
+  parseJSON = strParseJSON "ProtoServerWithAuth"
+
+noAuthSrv :: ProtocolServer p -> ProtoServerWithAuth p
+noAuthSrv srv = ProtoServerWithAuth srv Nothing
+
+legacyEncodeServer :: ProtocolServer p -> ByteString
+legacyEncodeServer ProtocolServer {host, port, keyHash} =
+  smpEncode (L.head host, port, keyHash)
+
+legacyServerP :: forall p. ProtocolTypeI p => Parser (ProtocolServer p)
+legacyServerP = do
+  (h, port, keyHash) <- smpP
+  pure ProtocolServer {scheme = protocolTypeI @p, host = [h], port, keyHash}
+
+legacyStrEncodeServer :: ProtocolTypeI p => ProtocolServer p -> ByteString
+legacyStrEncodeServer ProtocolServer {scheme, host, port, keyHash} =
+  strEncodeServer scheme (strEncode $ L.head host) port keyHash Nothing
+
+strEncodeServer :: ProtocolTypeI p => SProtocolType p -> ByteString -> ServiceName -> C.KeyHash -> Maybe BasicAuth -> ByteString
+strEncodeServer scheme host port keyHash auth_ =
+  strEncode scheme <> "://" <> strEncode keyHash <> maybe "" ((":" <>) . strEncode) auth_ <> "@" <> host <> portStr
+  where
+    portStr = B.pack $ if null port then "" else ':' : port
+
+serverStrP :: ProtocolTypeI p => Parser (ProtocolServer p, Maybe BasicAuth)
+serverStrP = do
+  scheme <- strP <* "://"
+  keyHash <- strP
+  auth_ <- optional $ A.char ':' *> strP
+  TransportHosts host <- A.char '@' *> strP
+  port <- portP <|> pure ""
+  pure (ProtocolServer {scheme, host, port, keyHash}, auth_)
+  where
+    portP = show <$> (A.char ':' *> (A.decimal :: Parser Int))
+
 data SrvLoc = SrvLoc HostName ServiceName
  deriving (Eq, Ord, Show)

@@ -429,7 +804,7 @@ instance StrEncoding SrvLoc where
  strP = SrvLoc <$> host <*> (port <|> pure "")
    where
      host = B.unpack <$> A.takeWhile1 (A.notInClass ":#,;/ ")
-      port = B.unpack <$> (A.char ':' *> A.takeWhile1 A.isDigit)
+      port = show <$> (A.char ':' *> (A.decimal :: Parser Int))

 -- | Transmission correlation ID.
 newtype CorrId = CorrId {bs :: ByteString} deriving (Eq, Ord, Show)
@@ -476,12 +851,18 @@ type SndPrivateSignKey = C.APrivateSignKey
 -- | Sender's public key used by SMP server to verify authorization of SMP commands.
 type SndPublicVerifyKey = C.APublicVerifyKey

-- | Private key used by push notifications server to authorize (sign) LSTN command.
+-- | Private key used by push notifications server to authorize (sign) NSUB command.
 type NtfPrivateSignKey = C.APrivateSignKey

-- | Public key used by SMP server to verify authorization of LSTN command sent by push notifications server.
+-- | Public key used by SMP server to verify authorization of NSUB command sent by push notifications server.
 type NtfPublicVerifyKey = C.APublicVerifyKey

+-- | Public key used for DH exchange to encrypt notification metadata from server to recipient
+type RcvNtfPublicDhKey = C.PublicKeyX25519
+
+-- | DH Secret used to encrypt notification metadata from server to recipient
+type RcvNtfDhSecret = C.DhSecretX25519
+
 -- | SMP message server ID.
 type MsgId = ByteString

@@ -502,12 +883,12 @@ data ErrorType
    QUOTA
  | -- | ACK command is sent without message to be acknowledged
    NO_MSG
-  | -- | sent message is too large (> maxMessageLength = 16078 bytes)
+  | -- | sent message is too large (> maxMessageLength = 16088 bytes)
    LARGE_MSG
  | -- | internal server error
    INTERNAL
  | -- | used internally, never returned by the server (to be removed)
-    DUPLICATE_ -- TODO remove, not part of SMP protocol
+    DUPLICATE_ -- not part of SMP protocol, used internally
  deriving (Eq, Generic, Read, Show)

 instance ToJSON ErrorType where
@@ -526,6 +907,8 @@ data CommandError
    UNKNOWN
  | -- | error parsing command
    SYNTAX
+  | -- | command is not allowed (SUB/GET cannot be used with the same queue in the same TCP connection)
+    PROHIBITED
  | -- | transmission has no required credentials (signature or queue ID)
    NO_AUTH
  | -- | transmission has credentials that are not allowed for this command
@@ -556,14 +939,18 @@ transmissionP = do
      command <- A.takeByteString
      pure RawTransmission {signature, signed, sessId, corrId, entityId, command}

-class (ProtocolEncoding msg, ProtocolEncoding (ProtocolCommand msg)) => Protocol msg where
-  type ProtocolCommand msg = cmd | cmd -> msg
-  protocolClientHandshake :: forall c. Transport c => c -> C.KeyHash -> ExceptT TransportError IO (THandle c)
-  protocolPing :: ProtocolCommand msg
+class (ProtocolEncoding msg, ProtocolEncoding (ProtoCommand msg), Show msg) => Protocol msg where
+  type ProtoCommand msg = cmd | cmd -> msg
+  type ProtoType msg = (sch :: ProtocolType) | sch -> msg
+  protocolClientHandshake :: forall c. Transport c => c -> C.KeyHash -> VersionRange -> ExceptT TransportError IO (THandle c)
+  protocolPing :: ProtoCommand msg
  protocolError :: msg -> Maybe ErrorType

+type ProtoServer msg = ProtocolServer (ProtoType msg)
+
 instance Protocol BrokerMsg where
-  type ProtocolCommand BrokerMsg = Cmd
+  type ProtoCommand BrokerMsg = Cmd
+  type ProtoType BrokerMsg = 'PSMP
  protocolClientHandshake = smpClientHandshake
  protocolPing = Cmd SSender PING
  protocolError = \case
@@ -572,28 +959,40 @@ instance Protocol BrokerMsg where

 class ProtocolMsgTag (Tag msg) => ProtocolEncoding msg where
  type Tag msg
-  encodeProtocol :: msg -> ByteString
-  protocolP :: Tag msg -> Parser msg
+  encodeProtocol :: Version -> msg -> ByteString
+  protocolP :: Version -> Tag msg -> Parser msg
  checkCredentials :: SignedRawTransmission -> msg -> Either ErrorType msg

 instance PartyI p => ProtocolEncoding (Command p) where
  type Tag (Command p) = CommandTag p
-  encodeProtocol = \case
-    NEW rKey dhKey -> e (NEW_, ' ', rKey, dhKey)
+  encodeProtocol v = \case
+    NEW rKey dhKey auth_ -> case auth_ of
+      Just auth
+        | v >= 5 -> new <> e ('A', auth)
+        | otherwise -> new
+      _ -> new
+      where
+        new = e (NEW_, ' ', rKey, dhKey)
    SUB -> e SUB_
    KEY k -> e (KEY_, ' ', k)
-    NKEY k -> e (NKEY_, ' ', k)
-    ACK -> e ACK_
+    NKEY k dhKey -> e (NKEY_, ' ', k, dhKey)
+    NDEL -> e NDEL_
+    GET -> e GET_
+    ACK msgId
+      | v == 1 -> e ACK_
+      | otherwise -> e (ACK_, ' ', msgId)
    OFF -> e OFF_
    DEL -> e DEL_
-    SEND msg -> e (SEND_, ' ', Tail msg)
+    SEND flags msg
+      | v == 1 -> e (SEND_, ' ', Tail msg)
+      | otherwise -> e (SEND_, ' ', flags, ' ', Tail msg)
    PING -> e PING_
    NSUB -> e NSUB_
    where
      e :: Encoding a => a -> ByteString
      e = smpEncode

-  protocolP tag = (\(Cmd _ c) -> checkParty c) <$?> protocolP (CT (sParty @p) tag)
+  protocolP v tag = (\(Cmd _ c) -> checkParty c) <$?> protocolP v (CT (sParty @p) tag)

  checkCredentials (sig, _, queueId, _) cmd = case cmd of
    -- NEW must have signature but NOT queue ID
@@ -602,7 +1001,7 @@ instance PartyI p => ProtocolEncoding (Command p) where
      | not (B.null queueId) -> Left $ CMD HAS_AUTH
      | otherwise -> Right cmd
    -- SEND must have queue ID, signature is not always required
-    SEND _
+    SEND {}
      | B.null queueId -> Left $ CMD NO_ENTITY
      | otherwise -> Right cmd
    -- PING must not have queue ID or signature
@@ -616,21 +1015,31 @@ instance PartyI p => ProtocolEncoding (Command p) where

 instance ProtocolEncoding Cmd where
  type Tag Cmd = CmdTag
-  encodeProtocol (Cmd _ c) = encodeProtocol c
+  encodeProtocol v (Cmd _ c) = encodeProtocol v c

-  protocolP = \case
+  protocolP v = \case
    CT SRecipient tag ->
      Cmd SRecipient <$> case tag of
-        NEW_ -> NEW <$> _smpP <*> smpP
+        NEW_
+          | v >= 5 -> new <*> optional (A.char 'A' *> smpP)
+          | otherwise -> new <*> pure Nothing
+          where
+            new = NEW <$> _smpP <*> smpP
        SUB_ -> pure SUB
        KEY_ -> KEY <$> _smpP
-        NKEY_ -> NKEY <$> _smpP
-        ACK_ -> pure ACK
+        NKEY_ -> NKEY <$> _smpP <*> smpP
+        NDEL_ -> pure NDEL
+        GET_ -> pure GET
+        ACK_
+          | v == 1 -> pure $ ACK ""
+          | otherwise -> ACK <$> _smpP
        OFF_ -> pure OFF
        DEL_ -> pure DEL
    CT SSender tag ->
      Cmd SSender <$> case tag of
-        SEND_ -> SEND . unTail <$> _smpP
+        SEND_
+          | v == 1 -> SEND noMsgFlags <$> (unTail <$> _smpP)
+          | otherwise -> SEND <$> _smpP <*> (unTail <$> _smpP)
        PING_ -> pure PING
    CT SNotifier NSUB_ -> pure $ Cmd SNotifier NSUB

@@ -638,11 +1047,14 @@ instance ProtocolEncoding Cmd where

 instance ProtocolEncoding BrokerMsg where
  type Tag BrokerMsg = BrokerMsgTag
-  encodeProtocol = \case
+  encodeProtocol v = \case
    IDS (QIK rcvId sndId srvDh) -> e (IDS_, ' ', rcvId, sndId, srvDh)
-    MSG msgId ts msgBody -> e (MSG_, ' ', msgId, ts, Tail msgBody)
-    NID nId -> e (NID_, ' ', nId)
-    NMSG -> e NMSG_
+    MSG RcvMessage {msgId, msgTs, msgFlags, msgBody = EncRcvMsgBody body}
+      | v == 1 -> e (MSG_, ' ', msgId, msgTs, Tail body)
+      | v == 2 -> e (MSG_, ' ', msgId, msgTs, msgFlags, ' ', Tail body)
+      | otherwise -> e (MSG_, ' ', msgId, Tail body)
+    NID nId srvNtfDh -> e (NID_, ' ', nId, srvNtfDh)
+    NMSG nmsgNonce encNMsgMeta -> e (NMSG_, ' ', nmsgNonce, encNMsgMeta)
    END -> e END_
    OK -> e OK_
    ERR err -> e (ERR_, ' ', err)
@@ -651,11 +1063,18 @@ instance ProtocolEncoding BrokerMsg where
      e :: Encoding a => a -> ByteString
      e = smpEncode

-  protocolP = \case
-    MSG_ -> MSG <$> _smpP <*> smpP <*> (unTail <$> smpP)
+  protocolP v = \case
+    MSG_ -> do
+      msgId <- _smpP
+      MSG <$> case v of
+        1 -> RcvMessage msgId <$> smpP <*> pure noMsgFlags <*> bodyP
+        2 -> RcvMessage msgId <$> smpP <*> smpP <*> (A.space *> bodyP)
+        _ -> RcvMessage msgId (MkSystemTime 0 0) noMsgFlags <$> bodyP
+      where
+        bodyP = EncRcvMsgBody . unTail <$> smpP
    IDS_ -> IDS <$> (QIK <$> _smpP <*> smpP <*> smpP)
-    NID_ -> NID <$> _smpP
-    NMSG_ -> pure NMSG
+    NID_ -> NID <$> _smpP <*> smpP
+    NMSG_ -> NMSG <$> _smpP <*> smpP
    END_ -> pure END
    OK_ -> pure OK
    ERR_ -> ERR <$> _smpP
@@ -679,11 +1098,11 @@ _smpP :: Encoding a => Parser a
 _smpP = A.space *> smpP

 -- | Parse SMP protocol commands and broker messages
-parseProtocol :: ProtocolEncoding msg => ByteString -> Either ErrorType msg
-parseProtocol s =
+parseProtocol :: ProtocolEncoding msg => Version -> ByteString -> Either ErrorType msg
+parseProtocol v s =
  let (tag, params) = B.break (== ' ') s
   in case decodeTag tag of
-        Just cmd -> parse (protocolP cmd) (CMD SYNTAX) params
+        Just cmd -> parse (protocolP v cmd) (CMD SYNTAX) params
        Nothing -> Left $ CMD UNKNOWN

 checkParty :: forall t p p'. (PartyI p, PartyI p') => t p' -> Either String (t p)
@@ -725,6 +1144,7 @@ instance Encoding CommandError where
  smpEncode e = case e of
    UNKNOWN -> "UNKNOWN"
    SYNTAX -> "SYNTAX"
+    PROHIBITED -> "PROHIBITED"
    NO_AUTH -> "NO_AUTH"
    HAS_AUTH -> "HAS_AUTH"
    NO_ENTITY -> "NO_ENTITY"
@@ -732,6 +1152,7 @@ instance Encoding CommandError where
    A.takeTill (== ' ') >>= \case
      "UNKNOWN" -> pure UNKNOWN
      "SYNTAX" -> pure SYNTAX
+      "PROHIBITED" -> pure PROHIBITED
      "NO_AUTH" -> pure NO_AUTH
      "HAS_AUTH" -> pure HAS_AUTH
      "NO_ENTITY" -> pure NO_ENTITY
@@ -739,20 +1160,58 @@ instance Encoding CommandError where
      _ -> fail "bad command error type"

 -- | Send signed SMP transmission to TCP transport.
-tPut :: Transport c => THandle c -> SentRawTransmission -> IO (Either TransportError ())
-tPut th (sig, t) = tPutBlock th $ smpEncode (C.signatureBytes sig) <> t
+tPut :: Transport c => THandle c -> NonEmpty SentRawTransmission -> IO [Either TransportError ()]
+tPut th trs
+  | batch th = tPutBatch [] $ L.map tEncode trs
+  | otherwise = forM (L.toList trs) $ tPutLog . tEncode
+  where
+    tPutBatch :: [Either TransportError ()] -> NonEmpty ByteString -> IO [Either TransportError ()]
+    tPutBatch rs ts = do
+      let (n, s, ts_) = encodeBatch 0 "" ts
+      r <- if n == 0 then largeMsg else replicate n <$> tPutLog (lenEncode n `B.cons` s)
+      let rs' = rs <> r
+      case ts_ of
+        Just ts' -> tPutBatch rs' ts'
+        _ -> pure rs'
+    largeMsg = putStrLn "tPut error: large message" >> pure [Left TELargeMsg]
+    tPutLog s = do
+      r <- tPutBlock th s
+      case r of
+        Left e -> putStrLn ("tPut error: " <> show e)
+        _ -> pure ()
+      pure r
+    encodeBatch :: Int -> ByteString -> NonEmpty ByteString -> (Int, ByteString, Maybe (NonEmpty ByteString))
+    encodeBatch n s ts@(t :| ts_)
+      | n == 255 = (n, s, Just ts)
+      | otherwise =
+        let s' = s <> smpEncode (Large t)
+            n' = n + 1
+         in if B.length s' > blockSize th - 1 -- one byte is reserved for the number of messages in the batch
+              then (n,s,) $ if n == 0 then L.nonEmpty ts_ else Just ts
+              else case L.nonEmpty ts_ of
+                Just ts' -> encodeBatch n' s' ts'
+                _ -> (n', s', Nothing)
+    tEncode (sig, tr) = smpEncode (C.signatureBytes sig) <> tr

-encodeTransmission :: ProtocolEncoding c => ByteString -> Transmission c -> ByteString
-encodeTransmission sessionId (CorrId corrId, queueId, command) =
-  smpEncode (sessionId, corrId, queueId) <> encodeProtocol command
+encodeTransmission :: ProtocolEncoding c => Version -> ByteString -> Transmission c -> ByteString
+encodeTransmission v sessionId (CorrId corrId, queueId, command) =
+  smpEncode (sessionId, corrId, queueId) <> encodeProtocol v command

 -- | Receive and parse transmission from the TCP transport (ignoring any trailing padding).
-tGetParse :: Transport c => THandle c -> IO (Either TransportError RawTransmission)
-tGetParse th = (parse transmissionP TEBadBlock =<<) <$> tGetBlock th
+tGetParse :: Transport c => THandle c -> IO (NonEmpty (Either TransportError RawTransmission))
+tGetParse th
+  | batch th = either ((:| []) . Left) id <$> runExceptT getBatch
+  | otherwise = (:| []) . (parse transmissionP TEBadBlock =<<) <$> tGetBlock th
+  where
+    getBatch :: ExceptT TransportError IO (NonEmpty (Either TransportError RawTransmission))
+    getBatch = do
+      s <- ExceptT $ tGetBlock th
+      ts <- liftEither $ parse smpP TEBadBlock s
+      pure $ L.map (\(Large t) -> parse transmissionP TEBadBlock t) ts

 -- | Receive client and server transmissions (determined by `cmd` type).
-tGet :: forall cmd c m. (ProtocolEncoding cmd, Transport c, MonadIO m) => THandle c -> m (SignedTransmission cmd)
-tGet th@THandle {sessionId} = liftIO (tGetParse th) >>= decodeParseValidate
+tGet :: forall cmd c m. (ProtocolEncoding cmd, Transport c, MonadIO m) => THandle c -> m (NonEmpty (SignedTransmission cmd))
+tGet th@THandle {sessionId, thVersion = v} = liftIO (tGetParse th) >>= mapM decodeParseValidate
  where
    decodeParseValidate :: Either TransportError RawTransmission -> m (SignedTransmission cmd)
    decodeParseValidate = \case
@@ -768,5 +1227,5 @@ tGet th@THandle {sessionId} = liftIO (tGetParse th) >>= decodeParseValidate

    tParseValidate :: ByteString -> SignedRawTransmission -> m (SignedTransmission cmd)
    tParseValidate signed t@(sig, corrId, entityId, command) = do
-      let cmd = parseProtocol command >>= checkCredentials t
+      let cmd = parseProtocol v command >>= checkCredentials t
      pure (sig, signed, (CorrId corrId, entityId, cmd))
@@ -6,6 +6,7 @@
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE NumericUnderscores #-}
+{-# LANGUAGE OverloadedLists #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
@@ -39,33 +40,46 @@ import Control.Monad.Except
 import Control.Monad.IO.Unlift
 import Control.Monad.Reader
 import Crypto.Random
+import Data.Bifunctor (first)
+import Data.ByteString.Base64 (encode)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
+import Data.Either (fromRight, partitionEithers)
 import Data.Functor (($>))
 import Data.List (intercalate)
+import qualified Data.List.NonEmpty as L
 import qualified Data.Map.Strict as M
 import Data.Maybe (isNothing)
-import qualified Data.Set as S
 import qualified Data.Text as T
+import Data.Text.Encoding (decodeLatin1)
 import Data.Time.Clock (UTCTime (..), diffTimeToPicoseconds, getCurrentTime)
 import Data.Time.Clock.System (SystemTime (..), getSystemTime)
+import Data.Time.Format.ISO8601 (iso8601Show)
 import Data.Type.Equality
+import GHC.TypeLits (KnownNat)
 import Network.Socket (ServiceName)
 import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Encoding (Encoding (smpEncode))
+import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Protocol
 import Simplex.Messaging.Server.Env.STM
 import Simplex.Messaging.Server.Expiration
 import Simplex.Messaging.Server.MsgStore
-import Simplex.Messaging.Server.MsgStore.STM (MsgQueue)
+import Simplex.Messaging.Server.MsgStore.STM
 import Simplex.Messaging.Server.QueueStore
-import Simplex.Messaging.Server.QueueStore.STM (QueueStore)
+import Simplex.Messaging.Server.QueueStore.STM
+import Simplex.Messaging.Server.Stats
 import Simplex.Messaging.Server.StoreLog
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport
 import Simplex.Messaging.Transport.Server
 import Simplex.Messaging.Util
+import System.Exit (exitFailure)
+import System.IO (hPutStrLn)
+import System.Mem.Weak (deRefWeak)
 import UnliftIO.Concurrent
+import UnliftIO.Directory (doesFileExist, renameFile)
 import UnliftIO.Exception
 import UnliftIO.IO
 import UnliftIO.STM
@@ -73,7 +87,7 @@ import UnliftIO.STM
 -- | Runs an SMP server using passed configuration.
 --
 -- See a full server here: https://github.com/simplex-chat/simplexmq/blob/master/apps/smp-server/Main.hs
-runSMPServer :: (MonadRandom m, MonadUnliftIO m) => ServerConfig -> m ()
+runSMPServer :: ServerConfig -> IO ()
 runSMPServer cfg = do
  started <- newEmptyTMVarIO
  runSMPServerBlocking started cfg
@@ -82,24 +96,27 @@ runSMPServer cfg = do
 --
 -- This function uses passed TMVar to signal when the server is ready to accept TCP requests (True)
 -- and when it is disconnected from the TCP socket once the server thread is killed (False).
-runSMPServerBlocking :: (MonadRandom m, MonadUnliftIO m) => TMVar Bool -> ServerConfig -> m ()
-runSMPServerBlocking started cfg = newEnv cfg >>= runReaderT (smpServer started)
+runSMPServerBlocking :: TMVar Bool -> ServerConfig -> IO ()
+runSMPServerBlocking started cfg = newEnv cfg >>= runReaderT (smpServer started cfg)

-smpServer :: forall m. (MonadUnliftIO m, MonadReader Env m) => TMVar Bool -> m ()
-smpServer started = do
+type M a = ReaderT Env IO a
+
+smpServer :: TMVar Bool -> ServerConfig -> M ()
+smpServer started cfg@ServerConfig {transports, logTLSErrors} = do
  s <- asks server
-  cfg@ServerConfig {transports} <- asks config
+  restoreServerStats
+  restoreServerMessages
  raceAny_
    ( serverThread s subscribedQ subscribers subscriptions cancelSub :
      serverThread s ntfSubscribedQ notifiers ntfSubscriptions (\_ -> pure ()) :
      map runServer transports <> expireMessagesThread_ cfg <> serverStatsThread_ cfg
    )
-    `finally` withLog closeStoreLog
+    `finally` (withLog closeStoreLog >> saveServerMessages >> saveServerStats)
  where
-    runServer :: (ServiceName, ATransport) -> m ()
+    runServer :: (ServiceName, ATransport) -> M ()
    runServer (tcpPort, ATransport t) = do
      serverParams <- asks tlsServerParams
-      runTransportServer started tcpPort serverParams (runClient t)
+      runTransportServer started tcpPort serverParams logTLSErrors (runClient t)

    serverThread ::
      forall s.
@@ -107,12 +124,12 @@ smpServer started = do
      (Server -> TBQueue (QueueId, Client)) ->
      (Server -> TMap QueueId Client) ->
      (Client -> TMap QueueId s) ->
-      (s -> m ()) ->
-      m ()
+      (s -> IO ()) ->
+      M ()
    serverThread s subQ subs clientSubs unsub = forever $ do
      atomically updateSubscribers
        $>>= endPreviousSubscriptions
-        >>= mapM_ unsub
+        >>= liftIO . mapM_ unsub
      where
        updateSubscribers :: STM (Maybe (QueueId, Client))
        updateSubscribers = do
@@ -124,17 +141,17 @@ smpServer started = do
                    yes <- readTVar $ connected c'
                    pure $ if yes then Just (qId, c') else Nothing
          TM.lookupInsert qId clnt (subs s) $>>= clientToBeNotified
-        endPreviousSubscriptions :: (QueueId, Client) -> m (Maybe s)
+        endPreviousSubscriptions :: (QueueId, Client) -> M (Maybe s)
        endPreviousSubscriptions (qId, c) = do
          void . forkIO . atomically $
-            writeTBQueue (sndQ c) (CorrId "", qId, END)
+            writeTBQueue (sndQ c) [(CorrId "", qId, END)]
          atomically $ TM.lookupDelete qId (clientSubs c)

-    expireMessagesThread_ :: ServerConfig -> [m ()]
+    expireMessagesThread_ :: ServerConfig -> [M ()]
    expireMessagesThread_ ServerConfig {messageExpiration = Just msgExp} = [expireMessages msgExp]
    expireMessagesThread_ _ = []

-    expireMessages :: ExpirationConfig -> m ()
+    expireMessages :: ExpirationConfig -> M ()
    expireMessages expCfg = do
      ms <- asks msgStore
      quota <- asks $ msgQueueQuota . config
@@ -147,55 +164,59 @@ smpServer started = do
          atomically (getMsgQueue ms rId quota)
            >>= atomically . (`deleteExpiredMsgs` old)

-    serverStatsThread_ :: ServerConfig -> [m ()]
-    serverStatsThread_ ServerConfig {logStatsInterval = Just interval, logStatsStartTime} =
-      [logServerStats logStatsStartTime interval]
+    serverStatsThread_ :: ServerConfig -> [M ()]
+    serverStatsThread_ ServerConfig {logStatsInterval = Just interval, logStatsStartTime, serverStatsLogFile} =
+      [logServerStats logStatsStartTime interval serverStatsLogFile]
    serverStatsThread_ _ = []

-    logServerStats :: Int -> Int -> m ()
-    logServerStats startAt logInterval = do
+    logServerStats :: Int -> Int -> FilePath -> M ()
+    logServerStats startAt logInterval statsFilePath = do
      initialDelay <- (startAt -) . fromIntegral . (`div` 1000000_000000) . diffTimeToPicoseconds . utctDayTime <$> liftIO getCurrentTime
-      logInfo $ "fromTime,qCreated,qSecured,qDeleted,msgSent,msgRecv,msgQueues"
+      liftIO $ putStrLn $ "server stats log enabled: " <> statsFilePath
      threadDelay $ 1000000 * (initialDelay + if initialDelay < 0 then 86400 else 0)
-      ServerStats {fromTime, qCreated, qSecured, qDeleted, msgSent, msgRecv, msgQueues} <- asks serverStats
+      ServerStats {fromTime, qCreated, qSecured, qDeleted, msgSent, msgRecv, activeQueues} <- asks serverStats
      let interval = 1000000 * logInterval
-      forever $ do
-        ts <- liftIO getCurrentTime
-        fromTime' <- atomically $ swapTVar fromTime ts
-        qCreated' <- atomically $ swapTVar qCreated 0
-        qSecured' <- atomically $ swapTVar qSecured 0
-        qDeleted' <- atomically $ swapTVar qDeleted 0
-        msgSent' <- atomically $ swapTVar msgSent 0
-        msgRecv' <- atomically $ swapTVar msgRecv 0
-        msgQueues' <- atomically $ S.size <$> swapTVar msgQueues S.empty
-        logInfo . T.pack $ intercalate "," [show fromTime', show qCreated', show qSecured', show qDeleted', show msgSent', show msgRecv', show msgQueues']
-        threadDelay interval
+      withFile statsFilePath AppendMode $ \h -> liftIO $ do
+        hSetBuffering h LineBuffering
+        forever $ do
+          ts <- getCurrentTime
+          fromTime' <- atomically $ swapTVar fromTime ts
+          qCreated' <- atomically $ swapTVar qCreated 0
+          qSecured' <- atomically $ swapTVar qSecured 0
+          qDeleted' <- atomically $ swapTVar qDeleted 0
+          msgSent' <- atomically $ swapTVar msgSent 0
+          msgRecv' <- atomically $ swapTVar msgRecv 0
+          ps <- atomically $ periodStatCounts activeQueues ts
+          hPutStrLn h $ intercalate "," [iso8601Show $ utctDay fromTime', show qCreated', show qSecured', show qDeleted', show msgSent', show msgRecv', dayCount ps, weekCount ps, monthCount ps]
+          threadDelay interval

-    runClient :: Transport c => TProxy c -> c -> m ()
+    runClient :: Transport c => TProxy c -> c -> M ()
    runClient _ h = do
      kh <- asks serverIdentity
-      liftIO (runExceptT $ smpServerHandshake h kh) >>= \case
+      smpVRange <- asks $ smpServerVRange . config
+      liftIO (runExceptT $ smpServerHandshake h kh smpVRange) >>= \case
        Right th -> runClientTransport th
        Left _ -> pure ()

-runClientTransport :: (Transport c, MonadUnliftIO m, MonadReader Env m) => THandle c -> m ()
-runClientTransport th@THandle {sessionId} = do
+runClientTransport :: Transport c => THandle c -> M ()
+runClientTransport th@THandle {thVersion, sessionId} = do
  q <- asks $ tbqSize . config
  ts <- liftIO getSystemTime
-  c <- atomically $ newClient q sessionId ts
+  c <- atomically $ newClient q thVersion sessionId ts
  s <- asks server
  expCfg <- asks $ inactiveClientExpiration . config
-  raceAny_ ([send th c, client c s, receive th c] <> disconnectThread_ c expCfg)
+  raceAny_ ([liftIO $ send th c, client c s, receive th c] <> disconnectThread_ c expCfg)
    `finally` clientDisconnected c
  where
-    disconnectThread_ c (Just expCfg) = [disconnectTransport th c activeAt expCfg]
+    disconnectThread_ c (Just expCfg) = [liftIO $ disconnectTransport th c activeAt expCfg]
    disconnectThread_ _ _ = []

-clientDisconnected :: (MonadUnliftIO m, MonadReader Env m) => Client -> m ()
+clientDisconnected :: Client -> M ()
 clientDisconnected c@Client {subscriptions, connected} = do
  atomically $ writeTVar connected False
  subs <- readTVarIO subscriptions
-  mapM_ cancelSub subs
+  liftIO $ mapM_ cancelSub subs
+  atomically $ writeTVar subscriptions M.empty
  cs <- asks $ subscribers . server
  atomically . mapM_ (\rId -> TM.update deleteCurrentClient rId cs) $ M.keys subs
  where
@@ -207,33 +228,43 @@ clientDisconnected c@Client {subscriptions, connected} = do
 sameClientSession :: Client -> Client -> Bool
 sameClientSession Client {sessionId} Client {sessionId = s'} = sessionId == s'

-cancelSub :: MonadUnliftIO m => Sub -> m ()
-cancelSub = \case
-  Sub {subThread = SubThread t} -> killThread t
-  _ -> return ()
+cancelSub :: TVar Sub -> IO ()
+cancelSub sub =
+  readTVarIO sub >>= \case
+    Sub {subThread = SubThread t} -> liftIO $ deRefWeak t >>= mapM_ killThread
+    _ -> return ()

-receive :: (Transport c, MonadUnliftIO m, MonadReader Env m) => THandle c -> Client -> m ()
+receive :: Transport c => THandle c -> Client -> M ()
 receive th Client {rcvQ, sndQ, activeAt} = forever $ do
-  (sig, signed, (corrId, queueId, cmdOrError)) <- tGet th
+  ts <- L.toList <$> tGet th
  atomically . writeTVar activeAt =<< liftIO getSystemTime
-  case cmdOrError of
-    Left e -> write sndQ (corrId, queueId, ERR e)
-    Right cmd -> do
-      verified <- verifyTransmission sig signed queueId cmd
-      if verified
-        then write rcvQ (corrId, queueId, cmd)
-        else write sndQ (corrId, queueId, ERR AUTH)
+  as <- partitionEithers <$> mapM cmdAction ts
+  write sndQ $ fst as
+  write rcvQ $ snd as
  where
-    write q t = atomically $ writeTBQueue q t
+    cmdAction :: SignedTransmission Cmd -> M (Either (Transmission BrokerMsg) (Maybe QueueRec, Transmission Cmd))
+    cmdAction (sig, signed, (corrId, queueId, cmdOrError)) =
+      case cmdOrError of
+        Left e -> pure $ Left (corrId, queueId, ERR e)
+        Right cmd -> verified <$> verifyTransmission sig signed queueId cmd
+          where
+            verified = \case
+              VRVerified qr -> Right (qr, (corrId, queueId, cmd))
+              VRFailed -> Left (corrId, queueId, ERR AUTH)
+    write q = mapM_ (atomically . writeTBQueue q) . L.nonEmpty

-send :: (Transport c, MonadUnliftIO m) => THandle c -> Client -> m ()
-send h Client {sndQ, sessionId, activeAt} = forever $ do
-  t <- atomically $ readTBQueue sndQ
-  -- TODO the line below can return Left, but we ignore it and do not disconnect the client
-  void . liftIO $ tPut h (Nothing, encodeTransmission sessionId t)
+send :: Transport c => THandle c -> Client -> IO ()
+send h@THandle {thVersion = v} Client {sndQ, sessionId, activeAt} = forever $ do
+  ts <- atomically $ L.sortWith tOrder <$> readTBQueue sndQ
+  void . liftIO . tPut h $ L.map ((Nothing,) . encodeTransmission v sessionId) ts
  atomically . writeTVar activeAt =<< liftIO getSystemTime
+  where
+    tOrder :: Transmission BrokerMsg -> Int
+    tOrder (_, _, cmd) = case cmd of
+      MSG {} -> 0
+      _ -> 1

-disconnectTransport :: (Transport c, MonadUnliftIO m) => THandle c -> client -> (client -> TVar SystemTime) -> ExpirationConfig -> m ()
+disconnectTransport :: Transport c => THandle c -> client -> (client -> TVar SystemTime) -> ExpirationConfig -> IO ()
 disconnectTransport THandle {connection} c activeAt expCfg = do
  let interval = checkInterval expCfg * 1000000
  forever . liftIO $ do
@@ -242,23 +273,27 @@ disconnectTransport THandle {connection} c activeAt expCfg = do
    ts <- readTVarIO $ activeAt c
    when (systemSeconds ts < old) $ closeConnection connection

-verifyTransmission ::
-  forall m. (MonadUnliftIO m, MonadReader Env m) => Maybe C.ASignature -> ByteString -> QueueId -> Cmd -> m Bool
+data VerificationResult = VRVerified (Maybe QueueRec) | VRFailed
+
+verifyTransmission :: Maybe C.ASignature -> ByteString -> QueueId -> Cmd -> M VerificationResult
 verifyTransmission sig_ signed queueId cmd = do
  case cmd of
-    Cmd SRecipient (NEW k _) -> pure $ verifyCmdSignature sig_ signed k
+    Cmd SRecipient (NEW k _ _) -> pure $ Nothing `verified` verifyCmdSignature sig_ signed k
    Cmd SRecipient _ -> verifyCmd SRecipient $ verifyCmdSignature sig_ signed . recipientKey
-    Cmd SSender (SEND _) -> verifyCmd SSender $ verifyMaybe . senderKey
-    Cmd SSender PING -> pure True
-    Cmd SNotifier NSUB -> verifyCmd SNotifier $ verifyMaybe . fmap snd . notifier
+    Cmd SSender SEND {} -> verifyCmd SSender $ verifyMaybe . senderKey
+    Cmd SSender PING -> pure $ VRVerified Nothing
+    Cmd SNotifier NSUB -> verifyCmd SNotifier $ verifyMaybe . fmap notifierKey . notifier
  where
-    verifyCmd :: SParty p -> (QueueRec -> Bool) -> m Bool
+    verifyCmd :: SParty p -> (QueueRec -> Bool) -> M VerificationResult
    verifyCmd party f = do
      st <- asks queueStore
-      q <- atomically $ getQueue st party queueId
-      pure $ either (const $ maybe False (dummyVerifyCmd signed) sig_ `seq` False) f q
+      q_ <- atomically (getQueue st party queueId)
+      pure $ case q_ of
+        Right q -> Just q `verified` f q
+        _ -> maybe False (dummyVerifyCmd signed) sig_ `seq` VRFailed
    verifyMaybe :: Maybe C.APublicVerifyKey -> Bool
    verifyMaybe = maybe (isNothing sig_) $ verifyCmdSignature sig_ signed
+    verified q cond = if cond then VRVerified q else VRFailed

 verifyCmdSignature :: Maybe C.ASignature -> ByteString -> C.APublicVerifyKey -> Bool
 verifyCmdSignature sig_ signed key = maybe False (verify key) sig_
@@ -286,37 +321,43 @@ dummyKeyEd448 :: C.PublicKey 'C.Ed448
 dummyKeyEd448 = "MEMwBQYDK2VxAzoA6ibQc9XpkSLtwrf7PLvp81qW/etiumckVFImCMRdftcG/XopbOSaq9qyLhrgJWKOLyNrQPNVvpMA"

 client :: forall m. (MonadUnliftIO m, MonadReader Env m) => Client -> Server -> m ()
-client clnt@Client {subscriptions, ntfSubscriptions, rcvQ, sndQ} Server {subscribedQ, ntfSubscribedQ, notifiers} =
+client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Server {subscribedQ, ntfSubscribedQ, notifiers} =
  forever $
    atomically (readTBQueue rcvQ)
-      >>= processCommand
+      >>= mapM processCommand
      >>= atomically . writeTBQueue sndQ
  where
-    processCommand :: Transmission Cmd -> m (Transmission BrokerMsg)
-    processCommand (corrId, queueId, cmd) = do
+    processCommand :: (Maybe QueueRec, Transmission Cmd) -> m (Transmission BrokerMsg)
+    processCommand (qr_, (corrId, queueId, cmd)) = do
      st <- asks queueStore
      case cmd of
        Cmd SSender command ->
          case command of
-            SEND msgBody -> sendMessage st msgBody
+            SEND flags msgBody -> withQueue $ \qr -> sendMessage qr flags msgBody
            PING -> pure (corrId, "", PONG)
        Cmd SNotifier NSUB -> subscribeNotifications
        Cmd SRecipient command ->
          case command of
-            NEW rKey dhKey ->
+            NEW rKey dhKey auth ->
              ifM
-                (asks $ allowNewQueues . config)
+                allowNew
                (createQueue st rKey dhKey)
                (pure (corrId, queueId, ERR AUTH))
-            SUB -> subscribeQueue queueId
-            ACK -> acknowledgeMsg
+              where
+                allowNew = do
+                  ServerConfig {allowNewQueues, newQueueBasicAuth} <- asks config
+                  pure $ allowNewQueues && maybe True ((== auth) . Just) newQueueBasicAuth
+            SUB -> withQueue (`subscribeQueue` queueId)
+            GET -> withQueue getMessage
+            ACK msgId -> withQueue (`acknowledgeMsg` msgId)
            KEY sKey -> secureQueue_ st sKey
-            NKEY nKey -> addQueueNotifier_ st nKey
+            NKEY nKey dhKey -> addQueueNotifier_ st nKey dhKey
+            NDEL -> deleteQueueNotifier_ st
            OFF -> suspendQueue_ st
            DEL -> delQueueAndMsgs st
      where
        createQueue :: QueueStore -> RcvPublicVerifyKey -> RcvPublicDhKey -> m (Transmission BrokerMsg)
-        createQueue st recipientKey dhKey = do
+        createQueue st recipientKey dhKey = time "NEW" $ do
          (rcvPublicDhKey, privDhKey) <- liftIO C.generateKeyPair'
          let rcvDhSecret = C.dh' dhKey privDhKey
              qik (rcvId, sndId) = QIK {rcvId, sndId, rcvPublicDhKey}
@@ -338,14 +379,15 @@ client clnt@Client {subscriptions, ntfSubscriptions, rcvQ, sndQ} Server {subscri
            addQueueRetry n qik qRec = do
              ids@(rId, _) <- getIds
              -- create QueueRec record with these ids and keys
-              atomically (addQueue st $ qRec ids) >>= \case
+              let qr = qRec ids
+              atomically (addQueue st qr) >>= \case
                Left DUPLICATE_ -> addQueueRetry (n - 1) qik qRec
                Left e -> pure $ ERR e
                Right _ -> do
                  withLog (`logCreateById` rId)
                  stats <- asks serverStats
-                  atomically $ modifyTVar (qCreated stats) (+ 1)
-                  subscribeQueue rId $> IDS (qik ids)
+                  atomically $ modifyTVar' (qCreated stats) (+ 1)
+                  subscribeQueue qr rId $> IDS (qik ids)

            logCreateById :: StoreLog 'WriteMode -> RecipientId -> IO ()
            logCreateById s rId =
@@ -359,154 +401,252 @@ client clnt@Client {subscriptions, ntfSubscriptions, rcvQ, sndQ} Server {subscri
              liftM2 (,) (randomId n) (randomId n)

        secureQueue_ :: QueueStore -> SndPublicVerifyKey -> m (Transmission BrokerMsg)
-        secureQueue_ st sKey = do
+        secureQueue_ st sKey = time "KEY" $ do
          withLog $ \s -> logSecureQueue s queueId sKey
          stats <- asks serverStats
-          atomically $ modifyTVar (qSecured stats) (+ 1)
+          atomically $ modifyTVar' (qSecured stats) (+ 1)
          atomically $ (corrId,queueId,) . either ERR (const OK) <$> secureQueue st queueId sKey

-        addQueueNotifier_ :: QueueStore -> NtfPublicVerifyKey -> m (Transmission BrokerMsg)
-        addQueueNotifier_ st nKey = (corrId,queueId,) <$> addNotifierRetry 3
+        addQueueNotifier_ :: QueueStore -> NtfPublicVerifyKey -> RcvNtfPublicDhKey -> m (Transmission BrokerMsg)
+        addQueueNotifier_ st notifierKey dhKey = time "NKEY" $ do
+          (rcvPublicDhKey, privDhKey) <- liftIO C.generateKeyPair'
+          let rcvNtfDhSecret = C.dh' dhKey privDhKey
+          (corrId,queueId,) <$> addNotifierRetry 3 rcvPublicDhKey rcvNtfDhSecret
          where
-            addNotifierRetry :: Int -> m BrokerMsg
-            addNotifierRetry 0 = pure $ ERR INTERNAL
-            addNotifierRetry n = do
-              nId <- randomId =<< asks (queueIdBytes . config)
-              atomically (addQueueNotifier st queueId nId nKey) >>= \case
-                Left DUPLICATE_ -> addNotifierRetry $ n - 1
+            addNotifierRetry :: Int -> RcvNtfPublicDhKey -> RcvNtfDhSecret -> m BrokerMsg
+            addNotifierRetry 0 _ _ = pure $ ERR INTERNAL
+            addNotifierRetry n rcvPublicDhKey rcvNtfDhSecret = do
+              notifierId <- randomId =<< asks (queueIdBytes . config)
+              let ntfCreds = NtfCreds {notifierId, notifierKey, rcvNtfDhSecret}
+              atomically (addQueueNotifier st queueId ntfCreds) >>= \case
+                Left DUPLICATE_ -> addNotifierRetry (n - 1) rcvPublicDhKey rcvNtfDhSecret
                Left e -> pure $ ERR e
                Right _ -> do
-                  withLog $ \s -> logAddNotifier s queueId nId nKey
-                  pure $ NID nId
+                  withLog $ \s -> logAddNotifier s queueId ntfCreds
+                  pure $ NID notifierId rcvPublicDhKey
+
+        deleteQueueNotifier_ :: QueueStore -> m (Transmission BrokerMsg)
+        deleteQueueNotifier_ st = do
+          withLog (`logDeleteNotifier` queueId)
+          okResp <$> atomically (deleteQueueNotifier st queueId)

        suspendQueue_ :: QueueStore -> m (Transmission BrokerMsg)
        suspendQueue_ st = do
-          withLog (`logDeleteQueue` queueId)
+          withLog (`logSuspendQueue` queueId)
          okResp <$> atomically (suspendQueue st queueId)

-        subscribeQueue :: RecipientId -> m (Transmission BrokerMsg)
-        subscribeQueue rId =
-          atomically (getSubscription rId) >>= deliverMessage tryPeekMsg rId
-
-        getSubscription :: RecipientId -> STM Sub
-        getSubscription rId = do
-          TM.lookup rId subscriptions >>= \case
-            Just s -> tryTakeTMVar (delivered s) $> s
-            Nothing -> do
+        subscribeQueue :: QueueRec -> RecipientId -> m (Transmission BrokerMsg)
+        subscribeQueue qr rId = do
+          atomically (TM.lookup rId subscriptions) >>= \case
+            Nothing ->
+              newSub >>= deliver
+            Just sub ->
+              readTVarIO sub >>= \case
+                Sub {subThread = ProhibitSub} ->
+                  -- cannot use SUB in the same connection where GET was used
+                  pure (corrId, rId, ERR $ CMD PROHIBITED)
+                s ->
+                  atomically (tryTakeTMVar $ delivered s) >> deliver sub
+          where
+            newSub :: m (TVar Sub)
+            newSub = time "SUB newSub" . atomically $ do
              writeTBQueue subscribedQ (rId, clnt)
-              s <- newSubscription
-              TM.insert rId s subscriptions
-              return s
+              sub <- newTVar =<< newSubscription NoSub
+              TM.insert rId sub subscriptions
+              pure sub
+            deliver :: TVar Sub -> m (Transmission BrokerMsg)
+            deliver sub = do
+              q <- getStoreMsgQueue "SUB" rId
+              msg_ <- atomically $ tryPeekMsg q
+              deliverMessage "SUB" qr rId sub q msg_
+
+        getMessage :: QueueRec -> m (Transmission BrokerMsg)
+        getMessage qr = time "GET" $ do
+          atomically (TM.lookup queueId subscriptions) >>= \case
+            Nothing ->
+              atomically newSub >>= getMessage_
+            Just sub ->
+              readTVarIO sub >>= \case
+                s@Sub {subThread = ProhibitSub} ->
+                  atomically (tryTakeTMVar $ delivered s)
+                    >> getMessage_ s
+                -- cannot use GET in the same connection where there is an active subscription
+                _ -> pure (corrId, queueId, ERR $ CMD PROHIBITED)
+          where
+            newSub :: STM Sub
+            newSub = do
+              s <- newSubscription ProhibitSub
+              sub <- newTVar s
+              TM.insert queueId sub subscriptions
+              pure s
+            getMessage_ :: Sub -> m (Transmission BrokerMsg)
+            getMessage_ s = do
+              q <- getStoreMsgQueue "GET" queueId
+              atomically $
+                tryPeekMsg q >>= \case
+                  Just msg ->
+                    let encMsg = encryptMsg qr msg
+                     in setDelivered s msg $> (corrId, queueId, MSG encMsg)
+                  _ -> pure (corrId, queueId, OK)
+
+        withQueue :: (QueueRec -> m (Transmission BrokerMsg)) -> m (Transmission BrokerMsg)
+        withQueue action = maybe (pure $ err AUTH) action qr_

        subscribeNotifications :: m (Transmission BrokerMsg)
-        subscribeNotifications = atomically $ do
+        subscribeNotifications = time "NSUB" . atomically $ do
          unlessM (TM.member queueId ntfSubscriptions) $ do
            writeTBQueue ntfSubscribedQ (queueId, clnt)
            TM.insert queueId () ntfSubscriptions
          pure ok

-        acknowledgeMsg :: m (Transmission BrokerMsg)
-        acknowledgeMsg =
-          atomically (withSub queueId $ \s -> const s <$$> tryTakeTMVar (delivered s))
-            >>= \case
-              Just (Just s) -> do
-                stats <- asks serverStats
-                atomically $ modifyTVar (msgRecv stats) (+ 1)
-                atomically $ modifyTVar (msgQueues stats) (S.insert queueId)
-                deliverMessage tryDelPeekMsg queueId s
-              _ -> return $ err NO_MSG
+        acknowledgeMsg :: QueueRec -> MsgId -> m (Transmission BrokerMsg)
+        acknowledgeMsg qr msgId = time "ACK" $ do
+          atomically (TM.lookup queueId subscriptions) >>= \case
+            Nothing -> pure $ err NO_MSG
+            Just sub ->
+              atomically (getDelivered sub) >>= \case
+                Just s -> do
+                  q <- getStoreMsgQueue "ACK" queueId
+                  case s of
+                    Sub {subThread = ProhibitSub} -> do
+                      msgDeleted <- atomically $ tryDelMsg q msgId
+                      when msgDeleted updateStats
+                      pure ok
+                    _ -> do
+                      (msgDeleted, msg_) <- atomically $ tryDelPeekMsg q msgId
+                      when msgDeleted updateStats
+                      deliverMessage "ACK" qr queueId sub q msg_
+                _ -> pure $ err NO_MSG
+          where
+            getDelivered :: TVar Sub -> STM (Maybe Sub)
+            getDelivered sub = do
+              s@Sub {delivered} <- readTVar sub
+              tryTakeTMVar delivered $>>= \msgId' ->
+                if msgId == msgId' || B.null msgId
+                  then pure $ Just s
+                  else putTMVar delivered msgId' $> Nothing
+            updateStats :: m ()
+            updateStats = do
+              stats <- asks serverStats
+              atomically $ modifyTVar' (msgRecv stats) (+ 1)
+              atomically $ updatePeriodStats (activeQueues stats) queueId

-        withSub :: RecipientId -> (Sub -> STM a) -> STM (Maybe a)
-        withSub rId f = mapM f =<< TM.lookup rId subscriptions
-
-        sendMessage :: QueueStore -> MsgBody -> m (Transmission BrokerMsg)
-        sendMessage st msgBody
+        sendMessage :: QueueRec -> MsgFlags -> MsgBody -> m (Transmission BrokerMsg)
+        sendMessage qr msgFlags msgBody
          | B.length msgBody > maxMessageLength = pure $ err LARGE_MSG
-          | otherwise = do
-            qr <- atomically $ getQueue st SSender queueId
-            either (return . err) storeMessage qr
-          where
-            storeMessage :: QueueRec -> m (Transmission BrokerMsg)
-            storeMessage qr = case status qr of
-              QueueOff -> return $ err AUTH
-              QueueActive ->
-                mkMessage >>= \case
-                  Left _ -> pure $ err LARGE_MSG
-                  Right msg -> do
-                    ms <- asks msgStore
-                    ServerConfig {messageExpiration, msgQueueQuota} <- asks config
-                    old <- liftIO $ mapM expireBeforeEpoch messageExpiration
-                    resp@(_, _, sent) <- atomically $ do
-                      q <- getMsgQueue ms (recipientId qr) msgQueueQuota
-                      mapM_ (deleteExpiredMsgs q) old
-                      ifM (isFull q) (pure $ err QUOTA) $ do
-                        trySendNotification
-                        writeMsg q msg
-                        pure ok
-                    when (sent == OK) $ do
+          | otherwise = case status qr of
+            QueueOff -> return $ err AUTH
+            QueueActive ->
+              case C.maxLenBS msgBody of
+                Left _ -> pure $ err LARGE_MSG
+                Right body -> do
+                  msg_ <- time "SEND" $ do
+                    q <- getStoreMsgQueue "SEND" $ recipientId qr
+                    expireMessages q
+                    atomically . writeMsg q =<< mkMessage body
+                  case msg_ of
+                    Nothing -> pure $ err QUOTA
+                    Just msg -> time "SEND ok" $ do
+                      when (notification msgFlags) $
+                        atomically . trySendNotification msg =<< asks idsDrg
                      stats <- asks serverStats
-                      atomically $ modifyTVar (msgSent stats) (+ 1)
-                      atomically $ modifyTVar (msgQueues stats) (S.insert $ recipientId qr)
-                    pure resp
-              where
-                mkMessage :: m (Either C.CryptoError Message)
-                mkMessage = do
-                  msgId <- randomId =<< asks (msgIdBytes . config)
-                  ts <- liftIO getSystemTime
-                  let c = C.cbEncrypt (rcvDhSecret qr) (C.cbNonce msgId) msgBody (maxMessageLength + 2)
-                  pure $ Message msgId ts <$> c
-
-                trySendNotification :: STM ()
-                trySendNotification =
-                  forM_ (notifier qr) $ \(nId, _) ->
-                    mapM_ (writeNtf nId) =<< TM.lookup nId notifiers
-
-                writeNtf :: NotifierId -> Client -> STM ()
-                writeNtf nId Client {sndQ = q} =
-                  unlessM (isFullTBQueue sndQ) $
-                    writeTBQueue q (CorrId "", nId, NMSG)
-
-        deliverMessage :: (MsgQueue -> STM (Maybe Message)) -> RecipientId -> Sub -> m (Transmission BrokerMsg)
-        deliverMessage tryPeek rId = \case
-          Sub {subThread = NoSub} -> do
-            ms <- asks msgStore
-            quota <- asks $ msgQueueQuota . config
-            q <- atomically $ getMsgQueue ms rId quota
-            atomically (tryPeek q) >>= \case
-              Nothing -> forkSub q $> ok
-              Just msg -> atomically setDelivered $> (corrId, rId, msgCmd msg)
-          _ -> pure ok
+                      atomically $ modifyTVar' (msgSent stats) (+ 1)
+                      atomically $ updatePeriodStats (activeQueues stats) (recipientId qr)
+                      pure ok
          where
-            forkSub :: MsgQueue -> m ()
-            forkSub q = do
-              atomically . setSub $ \s -> s {subThread = SubPending}
-              t <- forkIO $ subscriber q
-              atomically . setSub $ \case
+            mkMessage :: C.MaxLenBS MaxMessageLen -> m Message
+            mkMessage body = do
+              msgId <- randomId =<< asks (msgIdBytes . config)
+              msgTs <- liftIO getSystemTime
+              pure $ Message msgId msgTs msgFlags body
+
+            expireMessages :: MsgQueue -> m ()
+            expireMessages q = do
+              msgExp <- asks $ messageExpiration . config
+              old <- liftIO $ mapM expireBeforeEpoch msgExp
+              atomically $ mapM_ (deleteExpiredMsgs q) old
+
+            trySendNotification :: Message -> TVar ChaChaDRG -> STM ()
+            trySendNotification msg ntfNonceDrg =
+              forM_ (notifier qr) $ \NtfCreds {notifierId, rcvNtfDhSecret} ->
+                mapM_ (writeNtf notifierId msg rcvNtfDhSecret ntfNonceDrg) =<< TM.lookup notifierId notifiers
+
+            writeNtf :: NotifierId -> Message -> RcvNtfDhSecret -> TVar ChaChaDRG -> Client -> STM ()
+            writeNtf nId msg rcvNtfDhSecret ntfNonceDrg Client {sndQ = q} =
+              unlessM (isFullTBQueue q) $ case msg of
+                Message {msgId, msgTs} -> do
+                  (nmsgNonce, encNMsgMeta) <- mkMessageNotification msgId msgTs rcvNtfDhSecret ntfNonceDrg
+                  writeTBQueue q [(CorrId "", nId, NMSG nmsgNonce encNMsgMeta)]
+                _ -> pure ()
+
+            mkMessageNotification :: ByteString -> SystemTime -> RcvNtfDhSecret -> TVar ChaChaDRG -> STM (C.CbNonce, EncNMsgMeta)
+            mkMessageNotification msgId msgTs rcvNtfDhSecret ntfNonceDrg = do
+              cbNonce <- C.pseudoRandomCbNonce ntfNonceDrg
+              let msgMeta = NMsgMeta {msgId, msgTs}
+                  encNMsgMeta = C.cbEncrypt rcvNtfDhSecret cbNonce (smpEncode msgMeta) 128
+              pure . (cbNonce,) $ fromRight "" encNMsgMeta
+
+        deliverMessage :: T.Text -> QueueRec -> RecipientId -> TVar Sub -> MsgQueue -> Maybe Message -> m (Transmission BrokerMsg)
+        deliverMessage name qr rId sub q msg_ = time (name <> " deliver") $ do
+          readTVarIO sub >>= \case
+            s@Sub {subThread = NoSub} ->
+              case msg_ of
+                Just msg ->
+                  let encMsg = encryptMsg qr msg
+                   in atomically (setDelivered s msg) $> (corrId, rId, MSG encMsg)
+                _ -> forkSub $> ok
+            _ -> pure ok
+          where
+            forkSub :: m ()
+            forkSub = do
+              atomically . modifyTVar' sub $ \s -> s {subThread = SubPending}
+              t <- mkWeakThreadId =<< forkIO subscriber
+              atomically . modifyTVar' sub $ \case
                s@Sub {subThread = SubPending} -> s {subThread = SubThread t}
                s -> s
+              where
+                subscriber = do
+                  msg <- atomically $ peekMsg q
+                  time "subscriber" . atomically $ do
+                    let encMsg = encryptMsg qr msg
+                    writeTBQueue sndQ [(CorrId "", rId, MSG encMsg)]
+                    s <- readTVar sub
+                    void $ setDelivered s msg
+                    writeTVar sub $! s {subThread = NoSub}

-            subscriber :: MsgQueue -> m ()
-            subscriber q = atomically $ do
-              msg <- peekMsg q
-              writeTBQueue sndQ (CorrId "", rId, msgCmd msg)
-              setSub (\s -> s {subThread = NoSub})
-              void setDelivered
+        time :: T.Text -> m a -> m a
+        time name = timed name queueId

-            setSub :: (Sub -> Sub) -> STM ()
-            setSub f = TM.adjust f rId subscriptions
+        encryptMsg :: QueueRec -> Message -> RcvMessage
+        encryptMsg qr msg = case msg of
+          Message {msgFlags, msgBody}
+            | thVersion == 1 || thVersion == 2 -> encrypt msgFlags msgBody
+            | otherwise -> encrypt msgFlags $ encodeRcvMsgBody RcvMsgBody {msgTs = msgTs', msgFlags, msgBody}
+          MessageQuota {} ->
+            encrypt noMsgFlags $ encodeRcvMsgBody (RcvMsgQuota msgTs')
+          where
+            encrypt :: KnownNat i => MsgFlags -> C.MaxLenBS i -> RcvMessage
+            encrypt msgFlags body =
+              let encBody = EncRcvMsgBody $ C.cbEncryptMaxLenBS (rcvDhSecret qr) (C.cbNonce msgId') body
+               in RcvMessage msgId' msgTs' msgFlags encBody
+            msgId' = msgId (msg :: Message)
+            msgTs' = msgTs (msg :: Message)

-            setDelivered :: STM (Maybe Bool)
-            setDelivered = withSub rId $ \s -> tryPutTMVar (delivered s) ()
+        setDelivered :: Sub -> Message -> STM Bool
+        setDelivered s msg = tryPutTMVar (delivered s) $ msgId (msg :: Message)

-            msgCmd :: Message -> BrokerMsg
-            msgCmd Message {msgId, ts, msgBody} = MSG msgId ts msgBody
+        getStoreMsgQueue :: T.Text -> RecipientId -> m MsgQueue
+        getStoreMsgQueue name rId = time (name <> " getMsgQueue") $ do
+          ms <- asks msgStore
+          quota <- asks $ msgQueueQuota . config
+          atomically $ getMsgQueue ms rId quota

        delQueueAndMsgs :: QueueStore -> m (Transmission BrokerMsg)
        delQueueAndMsgs st = do
          withLog (`logDeleteQueue` queueId)
          ms <- asks msgStore
          stats <- asks serverStats
-          atomically $ modifyTVar (qDeleted stats) (+ 1)
+          atomically $ modifyTVar' (qDeleted stats) (+ 1)
          atomically $
            deleteQueue st queueId >>= \case
              Left e -> pure $ err e
@@ -526,7 +666,95 @@ withLog action = do
  env <- ask
  liftIO . mapM_ action $ storeLog (env :: Env)

+timed :: MonadUnliftIO m => T.Text -> RecipientId -> m a -> m a
+timed name qId a = do
+  t <- liftIO getSystemTime
+  r <- a
+  t' <- liftIO getSystemTime
+  let int = diff t t'
+  when (int > sec) . logDebug $ T.unwords [name, tshow $ encode qId, tshow int]
+  pure r
+  where
+    diff t t' = (systemSeconds t' - systemSeconds t) * sec + fromIntegral (systemNanoseconds t' - systemNanoseconds t)
+    sec = 1000_000000
+
 randomId :: (MonadUnliftIO m, MonadReader Env m) => Int -> m ByteString
 randomId n = do
  gVar <- asks idsDrg
  atomically (C.pseudoRandomBytes n gVar)
+
+saveServerMessages :: (MonadUnliftIO m, MonadReader Env m) => m ()
+saveServerMessages = asks (storeMsgsFile . config) >>= mapM_ saveMessages
+  where
+    saveMessages f = do
+      logInfo $ "saving messages to file " <> T.pack f
+      ms <- asks msgStore
+      liftIO . withFile f WriteMode $ \h ->
+        readTVarIO ms >>= mapM_ (saveQueueMsgs ms h) . M.keys
+      logInfo "messages saved"
+      where
+        saveQueueMsgs ms h rId =
+          atomically (flushMsgQueue ms rId)
+            >>= mapM_ (B.hPutStrLn h . strEncode . MLRv3 rId)
+
+restoreServerMessages :: forall m. (MonadUnliftIO m, MonadReader Env m) => m ()
+restoreServerMessages = asks (storeMsgsFile . config) >>= mapM_ restoreMessages
+  where
+    restoreMessages f = whenM (doesFileExist f) $ do
+      logInfo $ "restoring messages from file " <> T.pack f
+      st <- asks queueStore
+      ms <- asks msgStore
+      quota <- asks $ msgQueueQuota . config
+      runExceptT (liftIO (B.readFile f) >>= mapM_ (restoreMsg st ms quota) . B.lines) >>= \case
+        Left e -> do
+          logError . T.pack $ "error restoring messages: " <> e
+          liftIO exitFailure
+        _ -> do
+          renameFile f $ f <> ".bak"
+          logInfo "messages restored"
+      where
+        restoreMsg st ms quota s = do
+          r <- liftEither . first (msgErr "parsing") $ strDecode s
+          case r of
+            MLRv3 rId msg -> addToMsgQueue rId msg
+            MLRv1 rId encMsg -> do
+              qr <- liftEitherError (msgErr "queue unknown") . atomically $ getQueue st SRecipient rId
+              msg' <- updateMsgV1toV3 qr encMsg
+              addToMsgQueue rId msg'
+          where
+            addToMsgQueue rId msg = do
+              full <- atomically $ do
+                q <- getMsgQueue ms rId quota
+                isNothing <$> writeMsg q msg
+              when full . logError . decodeLatin1 $ "message queue " <> strEncode rId <> " is full, message not restored: " <> strEncode (msgId (msg :: Message))
+            updateMsgV1toV3 QueueRec {rcvDhSecret} RcvMessage {msgId, msgTs, msgFlags, msgBody = EncRcvMsgBody body} = do
+              let nonce = C.cbNonce msgId
+              msgBody <- liftEither . first (msgErr "v1 message decryption") $ C.maxLenBS =<< C.cbDecrypt rcvDhSecret nonce body
+              pure Message {msgId, msgTs, msgFlags, msgBody}
+            msgErr :: Show e => String -> e -> String
+            msgErr op e = op <> " error (" <> show e <> "): " <> B.unpack (B.take 100 s)
+
+saveServerStats :: (MonadUnliftIO m, MonadReader Env m) => m ()
+saveServerStats =
+  asks (serverStatsBackupFile . config)
+    >>= mapM_ (\f -> asks serverStats >>= atomically . getServerStatsData >>= liftIO . saveStats f)
+  where
+    saveStats f stats = do
+      logInfo $ "saving server stats to file " <> T.pack f
+      B.writeFile f $ strEncode stats
+      logInfo "server stats saved"
+
+restoreServerStats :: (MonadUnliftIO m, MonadReader Env m) => m ()
+restoreServerStats = asks (serverStatsBackupFile . config) >>= mapM_ restoreStats
+  where
+    restoreStats f = whenM (doesFileExist f) $ do
+      logInfo $ "restoring server stats from file " <> T.pack f
+      liftIO (strDecode <$> B.readFile f) >>= \case
+        Right d -> do
+          s <- asks serverStats
+          atomically $ setServerStats s d
+          renameFile f $ f <> ".bak"
+          logInfo "server stats restored"
+        Left e -> do
+          logInfo $ "error restoring server stats: " <> T.pack e
+          liftIO exitFailure
@@ -13,213 +13,133 @@ import Control.Monad
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import Data.Either (fromRight)
-import Data.Ini (Ini, lookupValue, readIniFile)
-import Data.Maybe (fromMaybe)
+import Data.Ini (Ini, lookupValue)
+import Data.Text (Text)
 import qualified Data.Text as T
 import Data.X509.Validation (Fingerprint (..))
 import Network.Socket (HostName, ServiceName)
 import Options.Applicative
 import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Protocol (ProtoServerWithAuth (..), ProtocolServer (..), ProtocolTypeI)
 import Simplex.Messaging.Transport (ATransport (..), TLS, Transport (..))
 import Simplex.Messaging.Transport.Server (loadFingerprint)
 import Simplex.Messaging.Transport.WebSockets (WS)
-import System.Directory (createDirectoryIfMissing, doesDirectoryExist, doesFileExist, removeDirectoryRecursive)
+import Simplex.Messaging.Util (whenM)
+import System.Directory (doesDirectoryExist, listDirectory, removeDirectoryRecursive, removePathForcibly)
 import System.Exit (exitFailure)
 import System.FilePath (combine)
-import System.IO (BufferMode (..), IOMode (..), hFlush, hGetLine, hSetBuffering, stderr, stdout, withFile)
+import System.IO (IOMode (..), hFlush, hGetLine, stdout, withFile)
 import System.Process (readCreateProcess, shell)
-import Text.Read (readMaybe)
-
-data ServerCLIConfig cfg = ServerCLIConfig
-  { cfgDir :: FilePath,
-    logDir :: FilePath,
-    iniFile :: FilePath,
-    storeLogFile :: FilePath,
-    caKeyFile :: FilePath,
-    caCrtFile :: FilePath,
-    serverKeyFile :: FilePath,
-    serverCrtFile :: FilePath,
-    fingerprintFile :: FilePath,
-    defaultServerPort :: ServiceName,
-    executableName :: String,
-    serverVersion :: String,
-    mkIniFile :: Bool -> ServiceName -> String,
-    mkServerConfig :: Maybe FilePath -> [(ServiceName, ATransport)] -> Ini -> cfg
-  }
-
-protocolServerCLI :: ServerCLIConfig cfg -> (cfg -> IO ()) -> IO ()
-protocolServerCLI cliCfg@ServerCLIConfig {iniFile, executableName} server =
-  getCliCommand cliCfg >>= \case
-    Init opts ->
-      doesFileExist iniFile >>= \case
-        True -> exitError $ "Error: server is already initialized (" <> iniFile <> " exists).\nRun `" <> executableName <> " start`."
-        _ -> initializeServer cliCfg opts
-    Start ->
-      doesFileExist iniFile >>= \case
-        True -> readIniFile iniFile >>= either exitError (runServer cliCfg server)
-        _ -> exitError $ "Error: server is not initialized (" <> iniFile <> " does not exist).\nRun `" <> executableName <> " init`."
-    Delete -> do
-      confirmOrExit "WARNING: deleting the server will make all queues inaccessible, because the server identity (certificate fingerprint) will change.\nTHIS CANNOT BE UNDONE!"
-      cleanup cliCfg
-      putStrLn "Deleted configuration and log files"

 exitError :: String -> IO ()
 exitError msg = putStrLn msg >> exitFailure

 confirmOrExit :: String -> IO ()
-confirmOrExit s = do
-  putStrLn s
-  putStr "Continue (Y/n): "
-  hFlush stdout
-  ok <- getLine
-  when (ok /= "Y") exitFailure
-
-data CliCommand
-  = Init InitOptions
-  | Start
-  | Delete
-
-data InitOptions = InitOptions
-  { enableStoreLog :: Bool,
-    signAlgorithm :: SignAlgorithm,
-    ip :: HostName,
-    fqdn :: Maybe HostName
-  }
-  deriving (Show)
+confirmOrExit s =
+  withPrompt (s <> "\nContinue (Y/n): ") $ do
+    ok <- getLine
+    when (ok /= "Y") $ putStrLn "Server NOT deleted" >> exitFailure

 data SignAlgorithm = ED448 | ED25519
  deriving (Read, Show)

-getCliCommand :: ServerCLIConfig cfg -> IO CliCommand
-getCliCommand cliCfg =
+data X509Config = X509Config
+  { commonName :: HostName,
+    signAlgorithm :: SignAlgorithm,
+    caKeyFile :: FilePath,
+    caCrtFile :: FilePath,
+    serverKeyFile :: FilePath,
+    serverCrtFile :: FilePath,
+    fingerprintFile :: FilePath,
+    opensslCaConfFile :: FilePath,
+    opensslServerConfFile :: FilePath,
+    serverCsrFile :: FilePath
+  }
+
+defaultX509Config :: X509Config
+defaultX509Config =
+  X509Config
+    { commonName = "127.0.0.1",
+      signAlgorithm = ED448,
+      caKeyFile = "ca.key",
+      caCrtFile = "ca.crt",
+      serverKeyFile = "server.key",
+      serverCrtFile = "server.crt",
+      fingerprintFile = "fingerprint",
+      opensslCaConfFile = "openssl_ca.conf",
+      opensslServerConfFile = "openssl_server.conf",
+      serverCsrFile = "server.csr"
+    }
+
+getCliCommand' :: Parser cmd -> String -> IO cmd
+getCliCommand' cmdP version =
  customExecParser
    (prefs showHelpOnEmpty)
    ( info
-        (helper <*> versionOption <*> cliCommandP cliCfg)
+        (helper <*> versionOption <*> cmdP)
        (header version <> fullDesc)
    )
  where
    versionOption = infoOption version (long "version" <> short 'v' <> help "Show version")
-    version = serverVersion cliCfg

-cliCommandP :: ServerCLIConfig cfg -> Parser CliCommand
-cliCommandP ServerCLIConfig {cfgDir, logDir, iniFile} =
-  hsubparser
-    ( command "init" (info initP (progDesc $ "Initialize server - creates " <> cfgDir <> " and " <> logDir <> " directories and configuration files"))
-        <> command "start" (info (pure Start) (progDesc $ "Start server (configuration: " <> iniFile <> ")"))
-        <> command "delete" (info (pure Delete) (progDesc "Delete configuration and log files"))
-    )
+createServerX509 :: FilePath -> X509Config -> IO ByteString
+createServerX509 cfgPath x509cfg = do
+  createOpensslCaConf
+  createOpensslServerConf
+  let alg = show $ signAlgorithm (x509cfg :: X509Config)
+  -- CA certificate (identity/offline)
+  run $ "openssl genpkey -algorithm " <> alg <> " -out " <> c caKeyFile
+  run $ "openssl req -new -x509 -days 999999 -config " <> c opensslCaConfFile <> " -extensions v3 -key " <> c caKeyFile <> " -out " <> c caCrtFile
+  -- server certificate (online)
+  run $ "openssl genpkey -algorithm " <> alg <> " -out " <> c serverKeyFile
+  run $ "openssl req -new -config " <> c opensslServerConfFile <> " -reqexts v3 -key " <> c serverKeyFile <> " -out " <> c serverCsrFile
+  run $ "openssl x509 -req -days 999999 -extfile " <> c opensslServerConfFile <> " -extensions v3 -in " <> c serverCsrFile <> " -CA " <> c caCrtFile <> " -CAkey " <> c caKeyFile <> " -CAcreateserial -out " <> c serverCrtFile
+  saveFingerprint
  where
-    initP :: Parser CliCommand
-    initP =
-      Init
-        <$> ( InitOptions
-                <$> switch
-                  ( long "store-log"
-                      <> short 'l'
-                      <> help "Enable store log for persistence"
-                  )
-                <*> option
-                  (maybeReader readMaybe)
-                  ( long "sign-algorithm"
-                      <> short 'a'
-                      <> help "Signature algorithm used for TLS certificates: ED25519, ED448"
-                      <> value ED448
-                      <> showDefault
-                      <> metavar "ALG"
-                  )
-                <*> strOption
-                  ( long "ip"
-                      <> help
-                        "Server IP address, used as Common Name for TLS online certificate if FQDN is not supplied"
-                      <> value "127.0.0.1"
-                      <> showDefault
-                      <> metavar "IP"
-                  )
-                <*> (optional . strOption)
-                  ( long "fqdn"
-                      <> short 'n'
-                      <> help "Server FQDN used as Common Name for TLS online certificate"
-                      <> showDefault
-                      <> metavar "FQDN"
-                  )
-            )
-
-initializeServer :: ServerCLIConfig cfg -> InitOptions -> IO ()
-initializeServer cliCfg InitOptions {enableStoreLog, signAlgorithm, ip, fqdn} = do
-  cleanup cliCfg
-  createDirectoryIfMissing True cfgDir
-  createDirectoryIfMissing True logDir
-  createX509
-  fp <- saveFingerprint
-  writeFile iniFile $ mkIniFile enableStoreLog defaultServerPort
-  putStrLn $ "Server initialized, you can modify configuration in " <> iniFile <> ".\nRun `" <> executableName <> " start` to start server."
-  printServiceInfo cliCfg fp
-  warnCAPrivateKeyFile
-  where
-    ServerCLIConfig {cfgDir, logDir, iniFile, executableName, caKeyFile, caCrtFile, serverKeyFile, serverCrtFile, fingerprintFile, defaultServerPort, mkIniFile} = cliCfg
-    createX509 = do
-      createOpensslCaConf
-      createOpensslServerConf
-      -- CA certificate (identity/offline)
-      run $ "openssl genpkey -algorithm " <> show signAlgorithm <> " -out " <> caKeyFile
-      run $ "openssl req -new -x509 -days 999999 -config " <> opensslCaConfFile <> " -extensions v3 -key " <> caKeyFile <> " -out " <> caCrtFile
-      -- server certificate (online)
-      run $ "openssl genpkey -algorithm " <> show signAlgorithm <> " -out " <> serverKeyFile
-      run $ "openssl req -new -config " <> opensslServerConfFile <> " -reqexts v3 -key " <> serverKeyFile <> " -out " <> serverCsrFile
-      run $ "openssl x509 -req -days 999999 -extfile " <> opensslServerConfFile <> " -extensions v3 -in " <> serverCsrFile <> " -CA " <> caCrtFile <> " -CAkey " <> caKeyFile <> " -CAcreateserial -out " <> serverCrtFile
-      where
-        run cmd = void $ readCreateProcess (shell cmd) ""
-        opensslCaConfFile = combine cfgDir "openssl_ca.conf"
-        opensslServerConfFile = combine cfgDir "openssl_server.conf"
-        serverCsrFile = combine cfgDir "server.csr"
-        createOpensslCaConf =
-          writeFile
-            opensslCaConfFile
-            "[req]\n\
-            \distinguished_name = req_distinguished_name\n\
-            \prompt = no\n\n\
-            \[req_distinguished_name]\n\
-            \CN = SMP server CA\n\
-            \O = SimpleX\n\n\
-            \[v3]\n\
-            \subjectKeyIdentifier = hash\n\
-            \authorityKeyIdentifier = keyid:always\n\
-            \basicConstraints = critical,CA:true\n"
-        -- TODO revise https://www.rfc-editor.org/rfc/rfc5280#section-4.2.1.3, https://www.rfc-editor.org/rfc/rfc3279#section-2.3.5
-        -- IP and FQDN can't both be used as server address interchangeably even if IP is added
-        -- as Subject Alternative Name, unless the following validation hook is disabled:
-        -- https://hackage.haskell.org/package/x509-validation-1.6.10/docs/src/Data-X509-Validation.html#validateCertificateName
-        createOpensslServerConf =
-          writeFile
-            opensslServerConfFile
-            ( "[req]\n\
-              \distinguished_name = req_distinguished_name\n\
-              \prompt = no\n\n\
-              \[req_distinguished_name]\n"
-                <> ("CN = " <> cn <> "\n\n")
-                <> "[v3]\n\
-                   \basicConstraints = CA:FALSE\n\
-                   \keyUsage = digitalSignature, nonRepudiation, keyAgreement\n\
-                   \extendedKeyUsage = serverAuth\n"
-            )
-          where
-            cn = fromMaybe ip fqdn
+    run cmd = void $ readCreateProcess (shell cmd) ""
+    c = combine cfgPath . ($ x509cfg)
+    createOpensslCaConf =
+      writeFile
+        (c opensslCaConfFile)
+        "[req]\n\
+        \distinguished_name = req_distinguished_name\n\
+        \prompt = no\n\n\
+        \[req_distinguished_name]\n\
+        \CN = SMP server CA\n\
+        \O = SimpleX\n\n\
+        \[v3]\n\
+        \subjectKeyIdentifier = hash\n\
+        \authorityKeyIdentifier = keyid:always\n\
+        \basicConstraints = critical,CA:true\n"
+    createOpensslServerConf =
+      writeFile
+        (c opensslServerConfFile)
+        ( "[req]\n\
+          \distinguished_name = req_distinguished_name\n\
+          \prompt = no\n\n\
+          \[req_distinguished_name]\n"
+            <> ("CN = " <> commonName x509cfg <> "\n\n")
+            <> "[v3]\n\
+               \basicConstraints = CA:FALSE\n\
+               \keyUsage = digitalSignature, nonRepudiation, keyAgreement\n\
+               \extendedKeyUsage = serverAuth\n"
+        )

    saveFingerprint = do
-      Fingerprint fp <- loadFingerprint caCrtFile
-      withFile fingerprintFile WriteMode (`B.hPutStrLn` strEncode fp)
+      Fingerprint fp <- loadFingerprint $ c caCrtFile
+      withFile (c fingerprintFile) WriteMode (`B.hPutStrLn` strEncode fp)
      pure fp

-    warnCAPrivateKeyFile =
-      putStrLn $
-        "----------\n\
-        \You should store CA private key securely and delete it from the server.\n\
-        \If server TLS credential is compromised this key can be used to sign a new one, \
-        \keeping the same server identity and established connections.\n\
-        \CA private key location:\n"
-          <> caKeyFile
-          <> "\n----------"
+warnCAPrivateKeyFile :: FilePath -> X509Config -> IO ()
+warnCAPrivateKeyFile cfgPath X509Config {caKeyFile} =
+  putStrLn $
+    "----------\n\
+    \You should store CA private key securely and delete it from the server.\n\
+    \If server TLS credential is compromised this key can be used to sign a new one, \
+    \keeping the same server identity and established connections.\n\
+    \CA private key location:\n"
+      <> combine cfgPath caKeyFile
+      <> "\n----------"

 data IniOptions = IniOptions
  { enableStoreLog :: Bool,
@@ -235,50 +155,76 @@ mkIniOptions ini =
      enableWebsockets = (== "on") $ strictIni "TRANSPORT" "websockets" ini
    }

-strictIni :: String -> String -> Ini -> T.Text
+strictIni :: Text -> Text -> Ini -> Text
 strictIni section key ini =
-  fromRight (error ("no key " <> key <> " in section " <> section)) $
-    lookupValue (T.pack section) (T.pack key) ini
+  fromRight (error . T.unpack $ "no key " <> key <> " in section " <> section) $
+    lookupValue section key ini

-readStrictIni :: Read a => String -> String -> Ini -> a
+readStrictIni :: Read a => Text -> Text -> Ini -> a
 readStrictIni section key = read . T.unpack . strictIni section key

-runServer :: ServerCLIConfig cfg -> (cfg -> IO ()) -> Ini -> IO ()
-runServer cliCfg server ini = do
-  hSetBuffering stdout LineBuffering
-  hSetBuffering stderr LineBuffering
-  fp <- checkSavedFingerprint
-  printServiceInfo cliCfg fp
-  let IniOptions {enableStoreLog, port, enableWebsockets} = mkIniOptions ini
-      transports = (port, transport @TLS) : [("80", transport @WS) | enableWebsockets]
-      logFile = if enableStoreLog then Just storeLogFile else Nothing
-      cfg = mkServerConfig logFile transports ini
-  printServerConfig logFile transports
-  server cfg
+iniOnOff :: Text -> Text -> Ini -> Maybe Bool
+iniOnOff section name ini = case lookupValue section name ini of
+  Right "on" -> Just True
+  Right "off" -> Just False
+  Right s -> error . T.unpack $ "invalid INI setting " <> name <> ": " <> s
+  _ -> Nothing
+
+withPrompt :: String -> IO a -> IO a
+withPrompt s a = putStr s >> hFlush stdout >> a
+
+onOffPrompt :: String -> Bool -> IO Bool
+onOffPrompt prompt def =
+  withPrompt (prompt <> if def then " (Yn): " else " (yN): ") $
+    getLine >>= \case
+      "" -> pure def
+      "y" -> pure True
+      "Y" -> pure True
+      "n" -> pure False
+      "N" -> pure False
+      _ -> putStrLn "Invalid input, please enter 'y' or 'n'" >> onOffPrompt prompt def
+
+onOff :: Bool -> String
+onOff True = "on"
+onOff _ = "off"
+
+settingIsOn :: Text -> Text -> Ini -> Maybe ()
+settingIsOn section name ini
+  | iniOnOff section name ini == Just True = Just ()
+  | otherwise = Nothing
+
+checkSavedFingerprint :: FilePath -> X509Config -> IO ByteString
+checkSavedFingerprint cfgPath x509cfg = do
+  savedFingerprint <- withFile (c fingerprintFile) ReadMode hGetLine
+  Fingerprint fp <- loadFingerprint (c caCrtFile)
+  when (B.pack savedFingerprint /= strEncode fp) $
+    exitError "Stored fingerprint is invalid."
+  pure fp
  where
-    ServerCLIConfig {storeLogFile, caCrtFile, fingerprintFile, mkServerConfig} = cliCfg
-    checkSavedFingerprint = do
-      savedFingerprint <- withFile fingerprintFile ReadMode hGetLine
-      Fingerprint fp <- loadFingerprint caCrtFile
-      when (B.pack savedFingerprint /= strEncode fp) $
-        exitError "Stored fingerprint is invalid."
-      pure fp
+    c = combine cfgPath . ($ x509cfg)

-    printServerConfig logFile transports = do
-      putStrLn $ case logFile of
-        Just f -> "Store log: " <> f
-        _ -> "Store log disabled."
-      forM_ transports $ \(p, ATransport t) ->
-        putStrLn $ "Listening on port " <> p <> " (" <> transportName t <> ")..."
+iniTransports :: Ini -> [(String, ATransport)]
+iniTransports ini =
+  let port = T.unpack $ strictIni "TRANSPORT" "port" ini
+      enableWebsockets = (== "on") $ strictIni "TRANSPORT" "websockets" ini
+   in (port, transport @TLS) : [("80", transport @WS) | enableWebsockets]

-cleanup :: ServerCLIConfig cfg -> IO ()
-cleanup ServerCLIConfig {cfgDir, logDir} = do
-  deleteDirIfExists cfgDir
-  deleteDirIfExists logDir
-  where
-    deleteDirIfExists path = doesDirectoryExist path >>= (`when` removeDirectoryRecursive path)
+printServerConfig :: [(ServiceName, ATransport)] -> Maybe FilePath -> IO ()
+printServerConfig transports logFile = do
+  putStrLn $ case logFile of
+    Just f -> "Store log: " <> f
+    _ -> "Store log disabled."
+  forM_ transports $ \(p, ATransport t) ->
+    putStrLn $ "Listening on port " <> p <> " (" <> transportName t <> ")..."

-printServiceInfo :: ServerCLIConfig cfg -> ByteString -> IO ()
-printServiceInfo ServerCLIConfig {serverVersion} fpStr = do
+deleteDirIfExists :: FilePath -> IO ()
+deleteDirIfExists path = whenM (doesDirectoryExist path) $ removeDirectoryRecursive path
+
+printServiceInfo :: ProtocolTypeI p => String -> ProtoServerWithAuth p -> IO ()
+printServiceInfo serverVersion srv@(ProtoServerWithAuth ProtocolServer {keyHash} _) = do
  putStrLn serverVersion
-  B.putStrLn $ "Fingerprint: " <> strEncode fpStr
+  B.putStrLn $ "Fingerprint: " <> strEncode keyHash
+  B.putStrLn $ "Server address: " <> strEncode srv
+
+clearDirIfExists :: FilePath -> IO ()
+clearDirIfExists path = whenM (doesDirectoryExist path) $ listDirectory path >>= mapM_ (removePathForcibly . combine path)
@@ -2,7 +2,6 @@
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE TupleSections #-}

 module Simplex.Messaging.Server.Env.STM where

@@ -10,11 +9,10 @@ import Control.Concurrent (ThreadId)
 import Control.Monad.IO.Unlift
 import Crypto.Random
 import Data.ByteString.Char8 (ByteString)
+import Data.List.NonEmpty (NonEmpty)
 import Data.Map.Strict (Map)
 import qualified Data.Map.Strict as M
-import Data.Set (Set)
-import qualified Data.Set as S
-import Data.Time.Clock (UTCTime, getCurrentTime)
+import Data.Time.Clock (getCurrentTime)
 import Data.Time.Clock.System (SystemTime)
 import Data.X509.Validation (Fingerprint (..))
 import Network.Socket (ServiceName)
@@ -24,26 +22,32 @@ import Simplex.Messaging.Crypto (KeyHash (..))
 import Simplex.Messaging.Protocol
 import Simplex.Messaging.Server.Expiration
 import Simplex.Messaging.Server.MsgStore.STM
-import Simplex.Messaging.Server.QueueStore (QueueRec (..))
+import Simplex.Messaging.Server.QueueStore (NtfCreds (..), QueueRec (..))
 import Simplex.Messaging.Server.QueueStore.STM
+import Simplex.Messaging.Server.Stats
 import Simplex.Messaging.Server.StoreLog
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport (ATransport)
 import Simplex.Messaging.Transport.Server (loadFingerprint, loadTLSServerParams)
+import Simplex.Messaging.Version
 import System.IO (IOMode (..))
+import System.Mem.Weak (Weak)
 import UnliftIO.STM

 data ServerConfig = ServerConfig
  { transports :: [(ServiceName, ATransport)],
    tbqSize :: Natural,
    serverTbqSize :: Natural,
-    msgQueueQuota :: Natural,
+    msgQueueQuota :: Int,
    queueIdBytes :: Int,
    msgIdBytes :: Int,
    storeLogFile :: Maybe FilePath,
+    storeMsgsFile :: Maybe FilePath,
    -- | set to False to prohibit creating new queues
    allowNewQueues :: Bool,
+    -- | simple password that the clients need to pass in handshake to be able to create new queues
+    newQueueBasicAuth :: Maybe BasicAuth,
    -- | time after which the messages can be removed from the queues and check interval, seconds
    messageExpiration :: Maybe ExpirationConfig,
    -- | time after which the socket with inactive client can be disconnected (without any messages or commands, incl. PING),
@@ -54,10 +58,17 @@ data ServerConfig = ServerConfig
    -- | time of the day when the stats are logged first, to log at consistent times,
    -- irrespective of when the server is started (seconds from 00:00 UTC)
    logStatsStartTime :: Int,
+    -- | file to log stats
+    serverStatsLogFile :: FilePath,
+    -- | file to save and restore stats
+    serverStatsBackupFile :: Maybe FilePath,
    -- | CA certificate private key is not needed for initialization
    caCertificateFile :: FilePath,
    privateKeyFile :: FilePath,
-    certificateFile :: FilePath
+    certificateFile :: FilePath,
+    -- | SMP client-server protocol version range
+    smpServerVRange :: VersionRange,
+    logTLSErrors :: Bool
  }

 defaultMessageExpiration :: ExpirationConfig
@@ -94,30 +105,21 @@ data Server = Server
  }

 data Client = Client
-  { subscriptions :: TMap RecipientId Sub,
+  { subscriptions :: TMap RecipientId (TVar Sub),
    ntfSubscriptions :: TMap NotifierId (),
-    rcvQ :: TBQueue (Transmission Cmd),
-    sndQ :: TBQueue (Transmission BrokerMsg),
+    rcvQ :: TBQueue (NonEmpty (Maybe QueueRec, Transmission Cmd)),
+    sndQ :: TBQueue (NonEmpty (Transmission BrokerMsg)),
+    thVersion :: Version,
    sessionId :: ByteString,
    connected :: TVar Bool,
    activeAt :: TVar SystemTime
  }

-data ServerStats = ServerStats
-  { qCreated :: TVar Int,
-    qSecured :: TVar Int,
-    qDeleted :: TVar Int,
-    msgSent :: TVar Int,
-    msgRecv :: TVar Int,
-    msgQueues :: TVar (Set RecipientId),
-    fromTime :: TVar UTCTime
-  }
-
-data SubscriptionThread = NoSub | SubPending | SubThread ThreadId
+data SubscriptionThread = NoSub | SubPending | SubThread (Weak ThreadId) | ProhibitSub

 data Sub = Sub
  { subThread :: SubscriptionThread,
-    delivered :: TMVar ()
+    delivered :: TMVar MsgId
  }

 newServer :: Natural -> STM Server
@@ -128,31 +130,20 @@ newServer qSize = do
  notifiers <- TM.empty
  return Server {subscribedQ, subscribers, ntfSubscribedQ, notifiers}

-newClient :: Natural -> ByteString -> SystemTime -> STM Client
-newClient qSize sessionId ts = do
+newClient :: Natural -> Version -> ByteString -> SystemTime -> STM Client
+newClient qSize thVersion sessionId ts = do
  subscriptions <- TM.empty
  ntfSubscriptions <- TM.empty
  rcvQ <- newTBQueue qSize
  sndQ <- newTBQueue qSize
  connected <- newTVar True
  activeAt <- newTVar ts
-  return Client {subscriptions, ntfSubscriptions, rcvQ, sndQ, sessionId, connected, activeAt}
+  return Client {subscriptions, ntfSubscriptions, rcvQ, sndQ, thVersion, sessionId, connected, activeAt}

-newServerStats :: UTCTime -> STM ServerStats
-newServerStats ts = do
-  qCreated <- newTVar 0
-  qSecured <- newTVar 0
-  qDeleted <- newTVar 0
-  msgSent <- newTVar 0
-  msgRecv <- newTVar 0
-  msgQueues <- newTVar S.empty
-  fromTime <- newTVar ts
-  pure ServerStats {qCreated, qSecured, qDeleted, msgSent, msgRecv, msgQueues, fromTime}
-
-newSubscription :: STM Sub
-newSubscription = do
+newSubscription :: SubscriptionThread -> STM Sub
+newSubscription subThread = do
  delivered <- newEmptyTMVar
-  return Sub {subThread = NoSub, delivered}
+  return Sub {subThread, delivered}

 newEnv :: forall m. (MonadUnliftIO m, MonadRandom m) => ServerConfig -> m Env
 newEnv config@ServerConfig {caCertificateFile, certificateFile, privateKeyFile, storeLogFile} = do
@@ -173,12 +164,12 @@ newEnv config@ServerConfig {caCertificateFile, certificateFile, privateKeyFile,
      (qs, s') <- liftIO $ readWriteStoreLog s
      atomically $ do
        writeTVar queues =<< mapM newTVar qs
-        writeTVar senders $ M.foldr' addSender M.empty qs
-        writeTVar notifiers $ M.foldr' addNotifier M.empty qs
+        writeTVar senders $! M.foldr' addSender M.empty qs
+        writeTVar notifiers $! M.foldr' addNotifier M.empty qs
      pure s'
    addSender :: QueueRec -> Map SenderId RecipientId -> Map SenderId RecipientId
    addSender q = M.insert (senderId q) (recipientId q)
    addNotifier :: QueueRec -> Map NotifierId RecipientId -> Map NotifierId RecipientId
    addNotifier q = case notifier q of
      Nothing -> id
-      Just (nId, _) -> M.insert nId (recipientId q)
+      Just NtfCreds {notifierId} -> M.insert notifierId (recipientId q)
@@ -0,0 +1,285 @@
+{-# LANGUAGE ApplicativeDo #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedLists #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PatternSynonyms #-}
+
+module Simplex.Messaging.Server.Main where
+
+import Control.Monad (void)
+import Crypto.Random (getRandomBytes)
+import qualified Data.ByteString.Char8 as B
+import Data.Either (fromRight)
+import Data.Functor (($>))
+import Data.Ini (lookupValue, readIniFile)
+import Data.Maybe (fromMaybe)
+import qualified Data.Text as T
+import Data.Text.Encoding (encodeUtf8)
+import Network.Socket (HostName)
+import Options.Applicative
+import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Protocol (BasicAuth (..), ProtoServerWithAuth (ProtoServerWithAuth), pattern SMPServer)
+import Simplex.Messaging.Server (runSMPServer)
+import Simplex.Messaging.Server.CLI
+import Simplex.Messaging.Server.Env.STM (ServerConfig (..), defaultInactiveClientExpiration, defaultMessageExpiration)
+import Simplex.Messaging.Server.Expiration
+import Simplex.Messaging.Transport (simplexMQVersion, supportedSMPServerVRange)
+import Simplex.Messaging.Transport.Client (TransportHost (..))
+import Simplex.Messaging.Util (safeDecodeUtf8)
+import System.Directory (createDirectoryIfMissing, doesFileExist)
+import System.FilePath (combine)
+import System.IO (BufferMode (..), hSetBuffering, stderr, stdout)
+import Text.Read (readMaybe)
+
+smpServerCLI :: FilePath -> FilePath -> IO ()
+smpServerCLI cfgPath logPath =
+  getCliCommand' (cliCommandP cfgPath logPath iniFile) serverVersion >>= \case
+    Init opts ->
+      doesFileExist iniFile >>= \case
+        True -> exitError $ "Error: server is already initialized (" <> iniFile <> " exists).\nRun `" <> executableName <> " start`."
+        _ -> initializeServer opts
+    Start ->
+      doesFileExist iniFile >>= \case
+        True -> readIniFile iniFile >>= either exitError runServer
+        _ -> exitError $ "Error: server is not initialized (" <> iniFile <> " does not exist).\nRun `" <> executableName <> " init`."
+    Delete -> do
+      confirmOrExit "WARNING: deleting the server will make all queues inaccessible, because the server identity (certificate fingerprint) will change.\nTHIS CANNOT BE UNDONE!"
+      deleteDirIfExists cfgPath
+      deleteDirIfExists logPath
+      putStrLn "Deleted configuration and log files"
+  where
+    iniFile = combine cfgPath "smp-server.ini"
+    serverVersion = "SMP server v" <> simplexMQVersion
+    defaultServerPort = "5223"
+    executableName = "smp-server"
+    storeLogFilePath = combine logPath "smp-server-store.log"
+    initializeServer opts
+      | scripted opts = initialize opts
+      | otherwise = do
+        putStrLn "Use `smp-server init -h` for available options."
+        void $ withPrompt "SMP server will be initialized (press Enter)" getLine
+        enableStoreLog <- onOffPrompt "Enable store log to restore queues and messages on server restart" True
+        logStats <- onOffPrompt "Enable logging daily statistics" False
+        putStrLn "Require a password to create new messaging queues?"
+        password <- withPrompt "'r' for random (default), 'n' - no password, or enter password: " serverPassword
+        let host = fromMaybe (ip opts) (fqdn opts)
+        host' <- withPrompt ("Enter server FQDN or IP address for certificate (" <> host <> "): ") getLine
+        initialize opts {enableStoreLog, logStats, fqdn = if null host' then fqdn opts else Just host', password}
+      where
+        serverPassword =
+          getLine >>= \case
+            "" -> pure $ Just SPRandom
+            "r" -> pure $ Just SPRandom
+            "n" -> pure Nothing
+            s ->
+              case strDecode $ encodeUtf8 $ T.pack s of
+                Right auth -> pure . Just $ ServerPassword auth
+                _ -> putStrLn "Invalid password. Only latin letters, digits and symbols other than '@' and ':' are allowed" >> serverPassword
+        initialize InitOptions {enableStoreLog, logStats, signAlgorithm, ip, fqdn, password} = do
+          clearDirIfExists cfgPath
+          clearDirIfExists logPath
+          createDirectoryIfMissing True cfgPath
+          createDirectoryIfMissing True logPath
+          let x509cfg = defaultX509Config {commonName = fromMaybe ip fqdn, signAlgorithm}
+          fp <- createServerX509 cfgPath x509cfg
+          basicAuth <- mapM createServerPassword password
+          let host = fromMaybe (if ip == "127.0.0.1" then "<hostnames>" else ip) fqdn
+              srv = ProtoServerWithAuth (SMPServer [THDomainName host] "" (C.KeyHash fp)) basicAuth
+          writeFile iniFile $ iniFileContent host basicAuth
+          putStrLn $ "Server initialized, you can modify configuration in " <> iniFile <> ".\nRun `" <> executableName <> " start` to start server."
+          warnCAPrivateKeyFile cfgPath x509cfg
+          printServiceInfo serverVersion srv
+          where
+            createServerPassword = \case
+              ServerPassword s -> pure s
+              SPRandom -> BasicAuth . strEncode <$> (getRandomBytes 32 :: IO B.ByteString)
+            iniFileContent host basicAuth =
+              "[STORE_LOG]\n\
+              \# The server uses STM memory for persistence,\n\
+              \# that will be lost on restart (e.g., as with redis).\n\
+              \# This option enables saving memory to append only log,\n\
+              \# and restoring it when the server is started.\n\
+              \# Log is compacted on start (deleted objects are removed).\n"
+                <> ("enable: " <> onOff enableStoreLog <> "\n\n")
+                <> "# Undelivered messages are optionally saved and restored when the server restarts,\n\
+                   \# they are preserved in the .bak file until the next restart.\n"
+                <> ("restore_messages: " <> onOff enableStoreLog <> "\n\n")
+                <> "# Log daily server statistics to CSV file\n"
+                <> ("log_stats: " <> onOff logStats <> "\n\n")
+                <> "[AUTH]\n\
+                   \# Set new_queues option to off to completely prohibit creating new messaging queues.\n\
+                   \# This can be useful when you want to decommission the server, but not all connections are switched yet.\n\
+                   \new_queues: on\n\n\
+                   \# Use create_password option to enable basic auth to create new messaging queues.\n\
+                   \# The password should be used as part of server address in client configuration:\n\
+                   \# smp://fingerprint:password@host1,host2\n\
+                   \# The password will not be shared with the connecting contacts, you must share it only\n\
+                   \# with the users who you want to allow creating messaging queues on your server.\n"
+                <> ( case basicAuth of
+                       Just auth -> "create_password: " <> T.unpack (safeDecodeUtf8 $ strEncode auth)
+                       _ -> "# create_password: password to create new queues (any printable ASCII characters without whitespace, '@', ':' and '/')"
+                   )
+                <> "\n\n\
+                   \[TRANSPORT]\n\
+                   \# host is only used to print server address on start\n"
+                <> ("host: " <> host <> "\n")
+                <> ("port: " <> defaultServerPort <> "\n")
+                <> "log_tls_errors: off\n\
+                   \websockets: off\n\n\
+                   \[INACTIVE_CLIENTS]\n\
+                   \# TTL and interval to check inactive clients\n\
+                   \disconnect: off\n"
+                <> ("# ttl: " <> show (ttl defaultInactiveClientExpiration) <> "\n")
+                <> ("# check_interval: " <> show (checkInterval defaultInactiveClientExpiration) <> "\n")
+    runServer ini = do
+      hSetBuffering stdout LineBuffering
+      hSetBuffering stderr LineBuffering
+      fp <- checkSavedFingerprint cfgPath defaultX509Config
+      let host = fromRight "<hostnames>" $ T.unpack <$> lookupValue "TRANSPORT" "host" ini
+          port = T.unpack $ strictIni "TRANSPORT" "port" ini
+          cfg@ServerConfig {transports, storeLogFile, newQueueBasicAuth, inactiveClientExpiration} = serverConfig
+          srv = ProtoServerWithAuth (SMPServer [THDomainName host] (if port == "5223" then "" else port) (C.KeyHash fp)) newQueueBasicAuth
+      printServiceInfo serverVersion srv
+      printServerConfig transports storeLogFile
+      putStrLn $ case inactiveClientExpiration of
+        Just ExpirationConfig {ttl, checkInterval} -> "expiring clients inactive for " <> show ttl <> " seconds every " <> show checkInterval <> " seconds"
+        _ -> "not expiring inactive clients"
+      putStrLn $
+        "creating new queues "
+          <> if allowNewQueues cfg
+            then maybe "allowed" (const "requires password") newQueueBasicAuth
+            else "NOT allowed"
+      runSMPServer cfg
+      where
+        enableStoreLog = settingIsOn "STORE_LOG" "enable" ini
+        logStats = settingIsOn "STORE_LOG" "log_stats" ini
+        c = combine cfgPath . ($ defaultX509Config)
+        serverConfig =
+          ServerConfig
+            { transports = iniTransports ini,
+              tbqSize = 32,
+              serverTbqSize = 128,
+              msgQueueQuota = 128,
+              queueIdBytes = 24,
+              msgIdBytes = 24, -- must be at least 24 bytes, it is used as 192-bit nonce for XSalsa20
+              caCertificateFile = c caCrtFile,
+              privateKeyFile = c serverKeyFile,
+              certificateFile = c serverCrtFile,
+              storeLogFile = enableStoreLog $> storeLogFilePath,
+              storeMsgsFile =
+                let messagesPath = combine logPath "smp-server-messages.log"
+                 in case iniOnOff "STORE_LOG" "restore_messages" ini of
+                      Just True -> Just messagesPath
+                      Just False -> Nothing
+                      -- if the setting is not set, it is enabled when store log is enabled
+                      _ -> enableStoreLog $> messagesPath,
+              -- allow creating new queues by default
+              allowNewQueues = fromMaybe True $ iniOnOff "AUTH" "new_queues" ini,
+              newQueueBasicAuth = case lookupValue "AUTH" "create_password" ini of
+                Right auth -> either error Just . strDecode $ encodeUtf8 auth
+                _ -> Nothing,
+              messageExpiration = Just defaultMessageExpiration,
+              inactiveClientExpiration =
+                settingIsOn "INACTIVE_CLIENTS" "disconnect" ini
+                  $> ExpirationConfig
+                    { ttl = readStrictIni "INACTIVE_CLIENTS" "ttl" ini,
+                      checkInterval = readStrictIni "INACTIVE_CLIENTS" "check_interval" ini
+                    },
+              logStatsInterval = logStats $> 86400, -- seconds
+              logStatsStartTime = 0, -- seconds from 00:00 UTC
+              serverStatsLogFile = combine logPath "smp-server-stats.daily.log",
+              serverStatsBackupFile = logStats $> combine logPath "smp-server-stats.log",
+              smpServerVRange = supportedSMPServerVRange,
+              logTLSErrors = fromMaybe False $ iniOnOff "TRANSPORT" "log_tls_errors" ini
+            }
+
+data CliCommand
+  = Init InitOptions
+  | Start
+  | Delete
+
+data InitOptions = InitOptions
+  { enableStoreLog :: Bool,
+    logStats :: Bool,
+    signAlgorithm :: SignAlgorithm,
+    ip :: HostName,
+    fqdn :: Maybe HostName,
+    password :: Maybe ServerPassword,
+    scripted :: Bool
+  }
+  deriving (Show)
+
+data ServerPassword = ServerPassword BasicAuth | SPRandom
+  deriving (Show)
+
+cliCommandP :: FilePath -> FilePath -> FilePath -> Parser CliCommand
+cliCommandP cfgPath logPath iniFile =
+  hsubparser
+    ( command "init" (info (Init <$> initP) (progDesc $ "Initialize server - creates " <> cfgPath <> " and " <> logPath <> " directories and configuration files"))
+        <> command "start" (info (pure Start) (progDesc $ "Start server (configuration: " <> iniFile <> ")"))
+        <> command "delete" (info (pure Delete) (progDesc "Delete configuration and log files"))
+    )
+  where
+    initP :: Parser InitOptions
+    initP = do
+      enableStoreLog <-
+        switch
+          ( long "store-log"
+              <> short 'l'
+              <> help "Enable store log for persistence"
+          )
+      logStats <-
+        switch
+          ( long "daily-stats"
+              <> short 's'
+              <> help "Enable logging daily server statistics"
+          )
+      signAlgorithm <-
+        option
+          (maybeReader readMaybe)
+          ( long "sign-algorithm"
+              <> short 'a'
+              <> help "Signature algorithm used for TLS certificates: ED25519, ED448"
+              <> value ED448
+              <> showDefault
+              <> metavar "ALG"
+          )
+      ip <-
+        strOption
+          ( long "ip"
+              <> help
+                "Server IP address, used as Common Name for TLS online certificate if FQDN is not supplied"
+              <> value "127.0.0.1"
+              <> showDefault
+              <> metavar "IP"
+          )
+      fqdn <-
+        (optional . strOption)
+          ( long "fqdn"
+              <> short 'n'
+              <> help "Server FQDN used as Common Name for TLS online certificate"
+              <> showDefault
+              <> metavar "FQDN"
+          )
+      password <-
+        flag' Nothing (long "no-password" <> help "Allow creating new queues without password")
+          <|> Just
+            <$> option
+              parseBasicAuth
+              ( long "password"
+                  <> metavar "PASSWORD"
+                  <> help "Set password to create new messaging queues"
+                  <> value SPRandom
+              )
+      scripted <-
+        switch
+          ( long "yes"
+              <> short 'y'
+              <> help "Non-interactive initialization using command-line options"
+          )
+      pure InitOptions {enableStoreLog, logStats, signAlgorithm, ip, fqdn, password, scripted}
+    parseBasicAuth :: ReadM ServerPassword
+    parseBasicAuth = eitherReader $ fmap ServerPassword . strDecode . B.pack
@@ -1,26 +1,16 @@
-{-# LANGUAGE FunctionalDependencies #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE OverloadedStrings #-}

 module Simplex.Messaging.Server.MsgStore where

-import Data.Int (Int64)
-import Data.Time.Clock.System (SystemTime)
-import Numeric.Natural
-import Simplex.Messaging.Protocol (MsgBody, MsgId, RecipientId)
+import Control.Applicative ((<|>))
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Protocol (Message (..), RcvMessage (..), RecipientId)

-data Message = Message
-  { msgId :: MsgId,
-    ts :: SystemTime,
-    msgBody :: MsgBody
-  }
+data MsgLogRecord = MLRv3 RecipientId Message | MLRv1 RecipientId RcvMessage

-class MonadMsgStore s q m | s -> q where
-  getMsgQueue :: s -> RecipientId -> Natural -> m q
-  delMsgQueue :: s -> RecipientId -> m ()
-
-class MonadMsgQueue q m where
-  isFull :: q -> m Bool
-  writeMsg :: q -> Message -> m () -- non blocking
-  tryPeekMsg :: q -> m (Maybe Message) -- non blocking
-  peekMsg :: q -> m Message -- blocking
-  tryDelPeekMsg :: q -> m (Maybe Message) -- atomic delete (== read) last and peek next message, if available
-  deleteExpiredMsgs :: q -> Int64 -> m ()
+instance StrEncoding MsgLogRecord where
+  strEncode = \case
+    MLRv3 rId msg -> strEncode (Str "v3", rId, msg)
+    MLRv1 rId msg -> strEncode (rId, msg)
+  strP = "v3 " *> (MLRv3 <$> strP_ <*> strP) <|> MLRv1 <$> strP_ <*> strP
@@ -1,62 +1,120 @@
 {-# LANGUAGE ConstraintKinds #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
-{-# LANGUAGE InstanceSigs #-}
+{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE TupleSections #-}

-module Simplex.Messaging.Server.MsgStore.STM where
+module Simplex.Messaging.Server.MsgStore.STM
+  ( STMMsgStore,
+    MsgQueue,
+    newMsgStore,
+    getMsgQueue,
+    delMsgQueue,
+    flushMsgQueue,
+    writeMsg,
+    tryPeekMsg,
+    peekMsg,
+    tryDelMsg,
+    tryDelPeekMsg,
+    deleteExpiredMsgs,
+  )
+where

+import Control.Concurrent.STM.TQueue (flushTQueue)
 import Control.Monad (when)
+import qualified Data.ByteString.Char8 as B
+import Data.Functor (($>))
 import Data.Int (Int64)
 import Data.Time.Clock.System (SystemTime (systemSeconds))
-import Numeric.Natural
-import Simplex.Messaging.Protocol (RecipientId)
-import Simplex.Messaging.Server.MsgStore
+import Simplex.Messaging.Protocol (Message (..), MsgId, RecipientId)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import UnliftIO.STM

-newtype MsgQueue = MsgQueue {msgQueue :: TBQueue Message}
+data MsgQueue = MsgQueue
+  { msgQueue :: TQueue Message,
+    quota :: Int,
+    canWrite :: TVar Bool,
+    size :: TVar Int
+  }

 type STMMsgStore = TMap RecipientId MsgQueue

 newMsgStore :: STM STMMsgStore
 newMsgStore = TM.empty

-instance MonadMsgStore STMMsgStore MsgQueue STM where
-  getMsgQueue :: STMMsgStore -> RecipientId -> Natural -> STM MsgQueue
-  getMsgQueue st rId quota = maybe newQ pure =<< TM.lookup rId st
-    where
-      newQ = do
-        q <- MsgQueue <$> newTBQueue quota
-        TM.insert rId q st
-        return q
+getMsgQueue :: STMMsgStore -> RecipientId -> Int -> STM MsgQueue
+getMsgQueue st rId quota = maybe newQ pure =<< TM.lookup rId st
+  where
+    newQ = do
+      msgQueue <- newTQueue
+      canWrite <- newTVar True
+      size <- newTVar 0
+      let q = MsgQueue {msgQueue, quota, canWrite, size}
+      TM.insert rId q st
+      pure q

-  delMsgQueue :: STMMsgStore -> RecipientId -> STM ()
-  delMsgQueue st rId = TM.delete rId st
+delMsgQueue :: STMMsgStore -> RecipientId -> STM ()
+delMsgQueue st rId = TM.delete rId st

-instance MonadMsgQueue MsgQueue STM where
-  isFull :: MsgQueue -> STM Bool
-  isFull = isFullTBQueue . msgQueue
+flushMsgQueue :: STMMsgStore -> RecipientId -> STM [Message]
+flushMsgQueue st rId = TM.lookupDelete rId st >>= maybe (pure []) (flushTQueue . msgQueue)

-  writeMsg :: MsgQueue -> Message -> STM ()
-  writeMsg = writeTBQueue . msgQueue
+writeMsg :: MsgQueue -> Message -> STM (Maybe Message)
+writeMsg MsgQueue {msgQueue = q, quota, canWrite, size} msg = do
+  canWrt <- readTVar canWrite
+  empty <- isEmptyTQueue q
+  if canWrt || empty
+    then do
+      canWrt' <- (quota >) <$> readTVar size
+      writeTVar canWrite $! canWrt'
+      modifyTVar' size (+ 1)
+      if canWrt'
+        then writeTQueue q msg $> Just msg
+        else writeTQueue q msgQuota $> Nothing
+    else pure Nothing
+  where
+    msgQuota = MessageQuota {msgId = msgId msg, msgTs = msgTs msg}

-  tryPeekMsg :: MsgQueue -> STM (Maybe Message)
-  tryPeekMsg = tryPeekTBQueue . msgQueue
+tryPeekMsg :: MsgQueue -> STM (Maybe Message)
+tryPeekMsg = tryPeekTQueue . msgQueue
+{-# INLINE tryPeekMsg #-}

-  peekMsg :: MsgQueue -> STM Message
-  peekMsg = peekTBQueue . msgQueue
+peekMsg :: MsgQueue -> STM Message
+peekMsg = peekTQueue . msgQueue
+{-# INLINE peekMsg #-}

-  -- atomic delete (== read) last and peek next message if available
-  tryDelPeekMsg :: MsgQueue -> STM (Maybe Message)
-  tryDelPeekMsg (MsgQueue q) = tryReadTBQueue q >> tryPeekTBQueue q
+tryDelMsg :: MsgQueue -> MsgId -> STM Bool
+tryDelMsg mq msgId' =
+  tryPeekMsg mq >>= \case
+    Just msg
+      | msgId msg == msgId' || B.null msgId' -> tryDeleteMsg mq >> pure True
+      | otherwise -> pure False
+    _ -> pure False

-  deleteExpiredMsgs :: MsgQueue -> Int64 -> STM ()
-  deleteExpiredMsgs (MsgQueue q) old = loop
-    where
-      loop = tryPeekTBQueue q >>= mapM_ delOldMsg
-      delOldMsg Message {ts} =
-        when (systemSeconds ts < old) $
-          tryReadTBQueue q >> loop
+-- atomic delete (== read) last and peek next message if available
+tryDelPeekMsg :: MsgQueue -> MsgId -> STM (Bool, Maybe Message)
+tryDelPeekMsg mq msgId' =
+  tryPeekMsg mq >>= \case
+    msg_@(Just msg)
+      | msgId msg == msgId' || B.null msgId' -> (True,) <$> (tryDeleteMsg mq >> tryPeekMsg mq)
+      | otherwise -> pure (False, msg_)
+    _ -> pure (False, Nothing)
+
+deleteExpiredMsgs :: MsgQueue -> Int64 -> STM ()
+deleteExpiredMsgs mq old = loop
+  where
+    loop = tryPeekMsg mq >>= mapM_ delOldMsg
+    delOldMsg = \case
+      Message {msgTs} ->
+        when (systemSeconds msgTs < old) $
+          tryDeleteMsg mq >> loop
+      _ -> pure ()
+
+tryDeleteMsg :: MsgQueue -> STM ()
+tryDeleteMsg MsgQueue {msgQueue = q, size} =
+  tryReadTQueue q >>= \case
+    Just _ -> modifyTVar' size (subtract 1)
+    _ -> pure ()
@@ -1,28 +1,35 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE KindSignatures #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE NamedFieldPuns #-}

 module Simplex.Messaging.Server.QueueStore where

+import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Protocol

 data QueueRec = QueueRec
-  { recipientId :: RecipientId,
-    recipientKey :: RcvPublicVerifyKey,
-    rcvDhSecret :: RcvDhSecret,
-    senderId :: SenderId,
-    senderKey :: Maybe SndPublicVerifyKey,
-    notifier :: Maybe (NotifierId, NtfPublicVerifyKey),
-    status :: QueueStatus
+  { recipientId :: !RecipientId,
+    recipientKey :: !RcvPublicVerifyKey,
+    rcvDhSecret :: !RcvDhSecret,
+    senderId :: !SenderId,
+    senderKey :: !(Maybe SndPublicVerifyKey),
+    notifier :: !(Maybe NtfCreds),
+    status :: !ServerQueueStatus
  }
  deriving (Eq, Show)

-data QueueStatus = QueueActive | QueueOff deriving (Eq, Show)
+data NtfCreds = NtfCreds
+  { notifierId :: !NotifierId,
+    notifierKey :: !NtfPublicVerifyKey,
+    rcvNtfDhSecret :: !RcvNtfDhSecret
+  }
+  deriving (Eq, Show)

-class MonadQueueStore s m where
-  addQueue :: s -> QueueRec -> m (Either ErrorType ())
-  getQueue :: s -> SParty p -> QueueId -> m (Either ErrorType QueueRec)
-  secureQueue :: s -> RecipientId -> SndPublicVerifyKey -> m (Either ErrorType QueueRec)
-  addQueueNotifier :: s -> RecipientId -> NotifierId -> NtfPublicVerifyKey -> m (Either ErrorType QueueRec)
-  suspendQueue :: s -> RecipientId -> m (Either ErrorType ())
-  deleteQueue :: s -> RecipientId -> m (Either ErrorType ())
+instance StrEncoding NtfCreds where
+  strEncode NtfCreds {notifierId, notifierKey, rcvNtfDhSecret} = strEncode (notifierId, notifierKey, rcvNtfDhSecret)
+  strP = do
+    (notifierId, notifierKey, rcvNtfDhSecret) <- strP
+    pure NtfCreds {notifierId, notifierKey, rcvNtfDhSecret}
+
+data ServerQueueStatus = QueueActive | QueueOff deriving (Eq, Show)
@@ -1,7 +1,6 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE GADTs #-}
-{-# LANGUAGE InstanceSigs #-}
 {-# LANGUAGE KindSignatures #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
@@ -10,7 +9,18 @@
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE UndecidableInstances #-}

-module Simplex.Messaging.Server.QueueStore.STM where
+module Simplex.Messaging.Server.QueueStore.STM
+  ( QueueStore (..),
+    newQueueStore,
+    addQueue,
+    getQueue,
+    secureQueue,
+    addQueueNotifier,
+    deleteQueueNotifier,
+    suspendQueue,
+    deleteQueue,
+  )
+where

 import Control.Monad
 import Data.Functor (($>))
@@ -34,57 +44,65 @@ newQueueStore = do
  notifiers <- TM.empty
  pure QueueStore {queues, senders, notifiers}

-instance MonadQueueStore QueueStore STM where
-  addQueue :: QueueStore -> QueueRec -> STM (Either ErrorType ())
-  addQueue QueueStore {queues, senders} q@QueueRec {recipientId = rId, senderId = sId} = do
-    ifM hasId (pure $ Left DUPLICATE_) $ do
-      qVar <- newTVar q
-      TM.insert rId qVar queues
-      TM.insert sId rId senders
-      pure $ Right ()
-    where
-      hasId = (||) <$> TM.member rId queues <*> TM.member sId senders
+addQueue :: QueueStore -> QueueRec -> STM (Either ErrorType ())
+addQueue QueueStore {queues, senders} q@QueueRec {recipientId = rId, senderId = sId} = do
+  ifM hasId (pure $ Left DUPLICATE_) $ do
+    qVar <- newTVar q
+    TM.insert rId qVar queues
+    TM.insert sId rId senders
+    pure $ Right ()
+  where
+    hasId = (||) <$> TM.member rId queues <*> TM.member sId senders

-  getQueue :: QueueStore -> SParty p -> QueueId -> STM (Either ErrorType QueueRec)
-  getQueue QueueStore {queues, senders, notifiers} party qId =
-    toResult <$> (mapM readTVar =<< getVar)
-    where
-      getVar = case party of
-        SRecipient -> TM.lookup qId queues
-        SSender -> TM.lookup qId senders $>>= (`TM.lookup` queues)
-        SNotifier -> TM.lookup qId notifiers $>>= (`TM.lookup` queues)
+getQueue :: QueueStore -> SParty p -> QueueId -> STM (Either ErrorType QueueRec)
+getQueue QueueStore {queues, senders, notifiers} party qId =
+  toResult <$> (mapM readTVar =<< getVar)
+  where
+    getVar = case party of
+      SRecipient -> TM.lookup qId queues
+      SSender -> TM.lookup qId senders $>>= (`TM.lookup` queues)
+      SNotifier -> TM.lookup qId notifiers $>>= (`TM.lookup` queues)

-  secureQueue :: QueueStore -> RecipientId -> SndPublicVerifyKey -> STM (Either ErrorType QueueRec)
-  secureQueue QueueStore {queues} rId sKey =
-    withQueue rId queues $ \qVar ->
-      readTVar qVar >>= \q -> case senderKey q of
-        Just _ -> pure Nothing
-        _ -> writeTVar qVar q {senderKey = Just sKey} $> Just q
+secureQueue :: QueueStore -> RecipientId -> SndPublicVerifyKey -> STM (Either ErrorType QueueRec)
+secureQueue QueueStore {queues} rId sKey =
+  withQueue rId queues $ \qVar ->
+    readTVar qVar >>= \q -> case senderKey q of
+      Just k -> pure $ if sKey == k then Just q else Nothing
+      _ ->
+        let q' = q {senderKey = Just sKey}
+         in writeTVar qVar q' $> Just q'

-  addQueueNotifier :: QueueStore -> RecipientId -> NotifierId -> NtfPublicVerifyKey -> STM (Either ErrorType QueueRec)
-  addQueueNotifier QueueStore {queues, notifiers} rId nId nKey = do
-    ifM (TM.member nId notifiers) (pure $ Left DUPLICATE_) $
-      withQueue rId queues $ \qVar ->
-        readTVar qVar >>= \q -> case notifier q of
-          Just _ -> pure Nothing
-          _ -> do
-            writeTVar qVar q {notifier = Just (nId, nKey)}
-            TM.insert nId rId notifiers
-            pure $ Just q
+addQueueNotifier :: QueueStore -> RecipientId -> NtfCreds -> STM (Either ErrorType QueueRec)
+addQueueNotifier QueueStore {queues, notifiers} rId ntfCreds@NtfCreds {notifierId = nId} = do
+  ifM (TM.member nId notifiers) (pure $ Left DUPLICATE_) $
+    withQueue rId queues $ \qVar -> do
+      q <- readTVar qVar
+      forM_ (notifier q) $ (`TM.delete` notifiers) . notifierId
+      writeTVar qVar $! q {notifier = Just ntfCreds}
+      TM.insert nId rId notifiers
+      pure $ Just q

-  suspendQueue :: QueueStore -> RecipientId -> STM (Either ErrorType ())
-  suspendQueue QueueStore {queues} rId =
-    withQueue rId queues $ \qVar -> modifyTVar' qVar (\q -> q {status = QueueOff}) $> Just ()
+deleteQueueNotifier :: QueueStore -> RecipientId -> STM (Either ErrorType ())
+deleteQueueNotifier QueueStore {queues, notifiers} rId =
+  withQueue rId queues $ \qVar -> do
+    q <- readTVar qVar
+    forM_ (notifier q) $ \NtfCreds {notifierId} -> TM.delete notifierId notifiers
+    writeTVar qVar $! q {notifier = Nothing}
+    pure $ Just ()

-  deleteQueue :: QueueStore -> RecipientId -> STM (Either ErrorType ())
-  deleteQueue QueueStore {queues, senders, notifiers} rId = do
-    TM.lookupDelete rId queues >>= \case
-      Just qVar ->
-        readTVar qVar >>= \q -> do
-          TM.delete (senderId q) senders
-          forM_ (notifier q) $ \(nId, _) -> TM.delete nId notifiers
-          pure $ Right ()
-      _ -> pure $ Left AUTH
+suspendQueue :: QueueStore -> RecipientId -> STM (Either ErrorType ())
+suspendQueue QueueStore {queues} rId =
+  withQueue rId queues $ \qVar -> modifyTVar' qVar (\q -> q {status = QueueOff}) $> Just ()
+
+deleteQueue :: QueueStore -> RecipientId -> STM (Either ErrorType ())
+deleteQueue QueueStore {queues, senders, notifiers} rId = do
+  TM.lookupDelete rId queues >>= \case
+    Just qVar ->
+      readTVar qVar >>= \q -> do
+        TM.delete (senderId q) senders
+        forM_ (notifier q) $ \NtfCreds {notifierId} -> TM.delete notifierId notifiers
+        pure $ Right ()
+    _ -> pure $ Left AUTH

 toResult :: Maybe a -> Either ErrorType a
 toResult = maybe (Left AUTH) Right
@@ -0,0 +1,168 @@
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PatternSynonyms #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module Simplex.Messaging.Server.Stats where
+
+import Control.Applicative (optional)
+import qualified Data.Attoparsec.ByteString.Char8 as A
+import qualified Data.ByteString.Char8 as B
+import Data.Set (Set)
+import qualified Data.Set as S
+import Data.Time.Calendar.Month.Compat (pattern MonthDay)
+import Data.Time.Calendar.OrdinalDate (mondayStartWeek)
+import Data.Time.Clock (UTCTime (..))
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Protocol (RecipientId)
+import UnliftIO.STM
+
+data ServerStats = ServerStats
+  { fromTime :: TVar UTCTime,
+    qCreated :: TVar Int,
+    qSecured :: TVar Int,
+    qDeleted :: TVar Int,
+    msgSent :: TVar Int,
+    msgRecv :: TVar Int,
+    activeQueues :: PeriodStats RecipientId
+  }
+
+data ServerStatsData = ServerStatsData
+  { _fromTime :: UTCTime,
+    _qCreated :: Int,
+    _qSecured :: Int,
+    _qDeleted :: Int,
+    _msgSent :: Int,
+    _msgRecv :: Int,
+    _activeQueues :: PeriodStatsData RecipientId
+  }
+
+newServerStats :: UTCTime -> STM ServerStats
+newServerStats ts = do
+  fromTime <- newTVar ts
+  qCreated <- newTVar 0
+  qSecured <- newTVar 0
+  qDeleted <- newTVar 0
+  msgSent <- newTVar 0
+  msgRecv <- newTVar 0
+  activeQueues <- newPeriodStats
+  pure ServerStats {fromTime, qCreated, qSecured, qDeleted, msgSent, msgRecv, activeQueues}
+
+getServerStatsData :: ServerStats -> STM ServerStatsData
+getServerStatsData s = do
+  _fromTime <- readTVar $ fromTime s
+  _qCreated <- readTVar $ qCreated s
+  _qSecured <- readTVar $ qSecured s
+  _qDeleted <- readTVar $ qDeleted s
+  _msgSent <- readTVar $ msgSent s
+  _msgRecv <- readTVar $ msgRecv s
+  _activeQueues <- getPeriodStatsData $ activeQueues s
+  pure ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeleted, _msgSent, _msgRecv, _activeQueues}
+
+setServerStats :: ServerStats -> ServerStatsData -> STM ()
+setServerStats s d = do
+  writeTVar (fromTime s) $! _fromTime d
+  writeTVar (qCreated s) $! _qCreated d
+  writeTVar (qSecured s) $! _qSecured d
+  writeTVar (qDeleted s) $! _qDeleted d
+  writeTVar (msgSent s) $! _msgSent d
+  writeTVar (msgRecv s) $! _msgRecv d
+  setPeriodStats (activeQueues s) (_activeQueues d)
+
+instance StrEncoding ServerStatsData where
+  strEncode ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeleted, _msgSent, _msgRecv, _activeQueues} =
+    B.unlines
+      [ "fromTime=" <> strEncode _fromTime,
+        "qCreated=" <> strEncode _qCreated,
+        "qSecured=" <> strEncode _qSecured,
+        "qDeleted=" <> strEncode _qDeleted,
+        "msgSent=" <> strEncode _msgSent,
+        "msgRecv=" <> strEncode _msgRecv,
+        "activeQueues:",
+        strEncode _activeQueues
+      ]
+  strP = do
+    _fromTime <- "fromTime=" *> strP <* A.endOfLine
+    _qCreated <- "qCreated=" *> strP <* A.endOfLine
+    _qSecured <- "qSecured=" *> strP <* A.endOfLine
+    _qDeleted <- "qDeleted=" *> strP <* A.endOfLine
+    _msgSent <- "msgSent=" *> strP <* A.endOfLine
+    _msgRecv <- "msgRecv=" *> strP <* A.endOfLine
+    r <- optional ("activeQueues:" <* A.endOfLine)
+    _activeQueues <- case r of
+      Just _ -> strP <* optional A.endOfLine
+      _ -> do
+        _day <- "dayMsgQueues=" *> strP <* A.endOfLine
+        _week <- "weekMsgQueues=" *> strP <* A.endOfLine
+        _month <- "monthMsgQueues=" *> strP <* optional A.endOfLine
+        pure PeriodStatsData {_day, _week, _month}
+    pure ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeleted, _msgSent, _msgRecv, _activeQueues}
+
+data PeriodStats a = PeriodStats
+  { day :: TVar (Set a),
+    week :: TVar (Set a),
+    month :: TVar (Set a)
+  }
+
+newPeriodStats :: STM (PeriodStats a)
+newPeriodStats = do
+  day <- newTVar S.empty
+  week <- newTVar S.empty
+  month <- newTVar S.empty
+  pure PeriodStats {day, week, month}
+
+data PeriodStatsData a = PeriodStatsData
+  { _day :: Set a,
+    _week :: Set a,
+    _month :: Set a
+  }
+
+getPeriodStatsData :: PeriodStats a -> STM (PeriodStatsData a)
+getPeriodStatsData s = do
+  _day <- readTVar $ day s
+  _week <- readTVar $ week s
+  _month <- readTVar $ month s
+  pure PeriodStatsData {_day, _week, _month}
+
+setPeriodStats :: PeriodStats a -> PeriodStatsData a -> STM ()
+setPeriodStats s d = do
+  writeTVar (day s) $! _day d
+  writeTVar (week s) $! _week d
+  writeTVar (month s) $! _month d
+
+instance (Ord a, StrEncoding a) => StrEncoding (PeriodStatsData a) where
+  strEncode PeriodStatsData {_day, _week, _month} =
+    "day=" <> strEncode _day <> "\nweek=" <> strEncode _week <> "\nmonth=" <> strEncode _month
+  strP = do
+    _day <- "day=" *> strP <* A.endOfLine
+    _week <- "week=" *> strP <* A.endOfLine
+    _month <- "month=" *> strP
+    pure PeriodStatsData {_day, _week, _month}
+
+data PeriodStatCounts = PeriodStatCounts
+  { dayCount :: String,
+    weekCount :: String,
+    monthCount :: String
+  }
+
+periodStatCounts :: forall a. PeriodStats a -> UTCTime -> STM PeriodStatCounts
+periodStatCounts ps ts = do
+  let d = utctDay ts
+      (_, wDay) = mondayStartWeek d
+      MonthDay _ mDay = d
+  dayCount <- periodCount 1 $ day ps
+  weekCount <- periodCount wDay $ week ps
+  monthCount <- periodCount mDay $ month ps
+  pure PeriodStatCounts {dayCount, weekCount, monthCount}
+  where
+    periodCount :: Int -> TVar (Set a) -> STM String
+    periodCount 1 pVar = show . S.size <$> swapTVar pVar S.empty
+    periodCount _ _ = pure ""
+
+updatePeriodStats :: Ord a => PeriodStats a -> a -> STM ()
+updatePeriodStats stats pId = do
+  updatePeriod day
+  updatePeriod week
+  updatePeriod month
+  where
+    updatePeriod pSel = modifyTVar' (pSel stats) (S.insert pId)
@@ -13,10 +13,13 @@ module Simplex.Messaging.Server.StoreLog
    openReadStoreLog,
    storeLogFilePath,
    closeStoreLog,
+    writeStoreLogRecord,
    logCreateQueue,
    logSecureQueue,
    logAddNotifier,
+    logSuspendQueue,
    logDeleteQueue,
+    logDeleteNotifier,
    readWriteStoreLog,
  )
 where
@@ -34,7 +37,7 @@ import Data.Map.Strict (Map)
 import qualified Data.Map.Strict as M
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Protocol
-import Simplex.Messaging.Server.QueueStore (QueueRec (..), QueueStatus (..))
+import Simplex.Messaging.Server.QueueStore (NtfCreds (..), QueueRec (..), ServerQueueStatus (..))
 import Simplex.Messaging.Transport (trimCR)
 import System.Directory (doesFileExist)
 import System.IO
@@ -48,8 +51,10 @@ data StoreLog (a :: IOMode) where
 data StoreLogRecord
  = CreateQueue QueueRec
  | SecureQueue QueueId SndPublicVerifyKey
-  | AddNotifier QueueId NotifierId NtfPublicVerifyKey
+  | AddNotifier QueueId NtfCreds
+  | SuspendQueue QueueId
  | DeleteQueue QueueId
+  | DeleteNotifier QueueId

 instance StrEncoding QueueRec where
  strEncode QueueRec {recipientId, recipientKey, rcvDhSecret, senderId, senderKey, notifier} =
@@ -62,7 +67,7 @@ instance StrEncoding QueueRec where
      ]
      <> maybe "" notifierStr notifier
    where
-      notifierStr (nId, nKey) = " nid=" <> strEncode nId <> " nk=" <> strEncode nKey
+      notifierStr ntfCreds = " notifier=" <> strEncode ntfCreds

  strP = do
    recipientId <- "rid=" *> strP_
@@ -70,24 +75,31 @@ instance StrEncoding QueueRec where
    rcvDhSecret <- "rdh=" *> strP_
    senderId <- "sid=" *> strP_
    senderKey <- "sk=" *> strP
-    notifier <- optional $ (,) <$> (" nid=" *> strP_) <*> ("nk=" *> strP)
+    notifier <- optional $ " notifier=" *> strP
    pure QueueRec {recipientId, recipientKey, rcvDhSecret, senderId, senderKey, notifier, status = QueueActive}

 instance StrEncoding StoreLogRecord where
  strEncode = \case
    CreateQueue q -> strEncode (Str "CREATE", q)
    SecureQueue rId sKey -> strEncode (Str "SECURE", rId, sKey)
-    AddNotifier rId nId nKey -> strEncode (Str "NOTIFIER", rId, nId, nKey)
+    AddNotifier rId ntfCreds -> strEncode (Str "NOTIFIER", rId, ntfCreds)
+    SuspendQueue rId -> strEncode (Str "SUSPEND", rId)
    DeleteQueue rId -> strEncode (Str "DELETE", rId)
+    DeleteNotifier rId -> strEncode (Str "NDELETE", rId)

  strP =
    "CREATE " *> (CreateQueue <$> strP)
      <|> "SECURE " *> (SecureQueue <$> strP_ <*> strP)
-      <|> "NOTIFIER " *> (AddNotifier <$> strP_ <*> strP_ <*> strP)
+      <|> "NOTIFIER " *> (AddNotifier <$> strP_ <*> strP)
+      <|> "SUSPEND " *> (SuspendQueue <$> strP)
      <|> "DELETE " *> (DeleteQueue <$> strP)
+      <|> "NDELETE " *> (DeleteNotifier <$> strP)

 openWriteStoreLog :: FilePath -> IO (StoreLog 'WriteMode)
-openWriteStoreLog f = WriteStoreLog f <$> openFile f WriteMode
+openWriteStoreLog f = do
+  h <- openFile f WriteMode
+  hSetBuffering h LineBuffering
+  pure $ WriteStoreLog f h

 openReadStoreLog :: FilePath -> IO (StoreLog 'ReadMode)
 openReadStoreLog f = do
@@ -104,7 +116,7 @@ closeStoreLog = \case
  WriteStoreLog _ h -> hClose h
  ReadStoreLog _ h -> hClose h

-writeStoreLogRecord :: StoreLog 'WriteMode -> StoreLogRecord -> IO ()
+writeStoreLogRecord :: StrEncoding r => StoreLog 'WriteMode -> r -> IO ()
 writeStoreLogRecord (WriteStoreLog _ h) r = do
  B.hPutStrLn h $ strEncode r
  hFlush h
@@ -115,12 +127,18 @@ logCreateQueue s = writeStoreLogRecord s . CreateQueue
 logSecureQueue :: StoreLog 'WriteMode -> QueueId -> SndPublicVerifyKey -> IO ()
 logSecureQueue s qId sKey = writeStoreLogRecord s $ SecureQueue qId sKey

-logAddNotifier :: StoreLog 'WriteMode -> QueueId -> NotifierId -> NtfPublicVerifyKey -> IO ()
-logAddNotifier s qId nId nKey = writeStoreLogRecord s $ AddNotifier qId nId nKey
+logAddNotifier :: StoreLog 'WriteMode -> QueueId -> NtfCreds -> IO ()
+logAddNotifier s qId ntfCreds = writeStoreLogRecord s $ AddNotifier qId ntfCreds
+
+logSuspendQueue :: StoreLog 'WriteMode -> QueueId -> IO ()
+logSuspendQueue s = writeStoreLogRecord s . SuspendQueue

 logDeleteQueue :: StoreLog 'WriteMode -> QueueId -> IO ()
 logDeleteQueue s = writeStoreLogRecord s . DeleteQueue

+logDeleteNotifier :: StoreLog 'WriteMode -> QueueId -> IO ()
+logDeleteNotifier s = writeStoreLogRecord s . DeleteNotifier
+
 readWriteStoreLog :: StoreLog 'ReadMode -> IO (Map RecipientId QueueRec, StoreLog 'WriteMode)
 readWriteStoreLog s@(ReadStoreLog f _) = do
  qs <- readQueues s
@@ -149,7 +167,9 @@ readQueues (ReadStoreLog _ h) = LB.hGetContents h >>= returnResult . procStoreLo
    procLogRecord m = \case
      CreateQueue q -> M.insert (recipientId q) q m
      SecureQueue qId sKey -> M.adjust (\q -> q {senderKey = Just sKey}) qId m
-      AddNotifier qId nId nKey -> M.adjust (\q -> q {notifier = Just (nId, nKey)}) qId m
+      AddNotifier qId ntfCreds -> M.adjust (\q -> q {notifier = Just ntfCreds}) qId m
+      SuspendQueue qId -> M.adjust (\q -> q {status = QueueOff}) qId m
      DeleteQueue qId -> M.delete qId m
+      DeleteNotifier qId -> M.adjust (\q -> q {notifier = Nothing}) qId m
    printError :: LogParsingError -> IO ()
    printError (e, s) = B.putStrLn $ "Error parsing log: " <> B.pack e <> " - " <> s
@@ -2,6 +2,7 @@ module Simplex.Messaging.TMap
  ( TMap,
    empty,
    singleton,
+    clear,
    Simplex.Messaging.TMap.null,
    Simplex.Messaging.TMap.lookup,
    member,
@@ -31,6 +32,10 @@ singleton :: k -> a -> STM (TMap k a)
 singleton k v = newTVar $ M.singleton k v
 {-# INLINE singleton #-}

+clear :: TMap k a -> STM ()
+clear m = writeTVar m M.empty
+{-# INLINE clear #-}
+
 null :: TMap k a -> STM Bool
 null m = M.null <$> readTVar m
 {-# INLINE null #-}
@@ -26,8 +26,9 @@
 -- See https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#appendix-a
 module Simplex.Messaging.Transport
  ( -- * SMP transport parameters
-    supportedSMPVersions,
+    supportedSMPServerVRange,
    simplexMQVersion,
+    smpBlockSize,

    -- * Transport connection class
    Transport (..),
@@ -46,12 +47,15 @@ module Simplex.Messaging.Transport
    -- * SMP transport
    THandle (..),
    TransportError (..),
+    HandshakeError (..),
    smpServerHandshake,
    smpClientHandshake,
    tPutBlock,
    tGetBlock,
    serializeTransportError,
    transportErrorP,
+    sendHandshake,
+    getHandshake,

    -- * Trim trailing CR
    trimCR,
@@ -71,12 +75,14 @@ import qualified Data.ByteString.Char8 as B
 import qualified Data.ByteString.Lazy as BL
 import Data.Default (def)
 import Data.Functor (($>))
+import Data.Version (showVersion)
 import GHC.Generics (Generic)
 import GHC.IO.Handle.Internals (ioe_EOF)
 import Generic.Random (genericArbitraryU)
 import Network.Socket
 import qualified Network.TLS as T
 import qualified Network.TLS.Extra as TE
+import qualified Paths_simplexmq as SMQ
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Parsers (dropPrefix, parse, parseRead1, sumTypeJSON)
@@ -92,11 +98,11 @@ import UnliftIO.STM
 smpBlockSize :: Int
 smpBlockSize = 16384

-supportedSMPVersions :: VersionRange
-supportedSMPVersions = mkVersionRange 1 1
+supportedSMPServerVRange :: VersionRange
+supportedSMPServerVRange = mkVersionRange 1 5

 simplexMQVersion :: String
-simplexMQVersion = "2.1.1"
+simplexMQVersion = showVersion SMQ.version

 -- * Transport connection class

@@ -150,12 +156,14 @@ data TLS = TLS
    getLock :: TMVar ()
  }

-connectTLS :: T.TLSParams p => p -> Socket -> IO T.Context
-connectTLS params sock =
-  E.bracketOnError (T.contextNew sock params) closeTLS $ \ctx -> do
-    T.handshake ctx
-      `catchAll` \e -> putStrLn ("exception: " <> show e) >> E.throwIO e
-    pure ctx
+connectTLS :: T.TLSParams p => Maybe HostName -> Bool -> p -> Socket -> IO T.Context
+connectTLS host_ logErrors params sock =
+  E.bracketOnError (T.contextNew sock params) closeTLS $ \ctx ->
+    logHandshakeErrors (T.handshake ctx) $> ctx
+  where
+    logHandshakeErrors = if logErrors then (`catchAll` logThrow) else id
+    logThrow e = putStrLn ("TLS error" <> host <> ": " <> show e) >> E.throwIO e
+    host = maybe "" (\h -> " (" <> h <> ")") host_

 getTLS :: TransportPeer -> T.Context -> IO TLS
 getTLS tlsPeer cxt = withTlsUnique tlsPeer cxt newTLS
@@ -208,16 +216,17 @@ instance Transport TLS where
      $ do
        b <- readChunks =<< readTVarIO buffer
        let (s, b') = B.splitAt n b
-        atomically $ writeTVar buffer b'
+        atomically $ writeTVar buffer $! b'
        pure s
    where
      readChunks :: ByteString -> IO ByteString
      readChunks b
        | B.length b >= n = pure b
-        | otherwise = readChunks . (b <>) =<< T.recvData tlsContext `E.catch` handleEOF
-      handleEOF = \case
-        T.Error_EOF -> E.throwIO TEBadBlock
-        e -> E.throwIO e
+        | otherwise =
+          T.recvData tlsContext >>= \case
+            -- https://hackage.haskell.org/package/tls-1.6.0/docs/Network-TLS.html#v:recvData
+            "" -> ioe_EOF
+            s -> readChunks $ b <> s

  cPut :: TLS -> ByteString -> IO ()
  cPut tls = T.sendData (tlsContext tls) . BL.fromStrict
@@ -230,7 +239,7 @@ instance Transport TLS where
      $ do
        b <- readChunks =<< readTVarIO buffer
        let (s, b') = B.break (== '\n') b
-        atomically $ writeTVar buffer (B.drop 1 b') -- drop '\n' we made a break at
+        atomically $ writeTVar buffer $! B.drop 1 b' -- drop '\n' we made a break at
        pure $ trimCR s
    where
      readChunks :: ByteString -> IO ByteString
@@ -254,7 +263,10 @@ data THandle c = THandle
    sessionId :: SessionId,
    blockSize :: Int,
    -- | agreed server protocol version
-    thVersion :: Version
+    thVersion :: Version,
+    -- | send multiple transmissions in a single block
+    -- based on protocol and protocol version
+    batch :: Bool
  }

 -- | TLS-unique channel binding
@@ -351,33 +363,36 @@ tGetBlock THandle {connection = c, blockSize} =
 -- | Server SMP transport handshake.
 --
 -- See https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#appendix-a
-smpServerHandshake :: forall c. Transport c => c -> C.KeyHash -> ExceptT TransportError IO (THandle c)
-smpServerHandshake c kh = do
+smpServerHandshake :: forall c. Transport c => c -> C.KeyHash -> VersionRange -> ExceptT TransportError IO (THandle c)
+smpServerHandshake c kh smpVRange = do
  let th@THandle {sessionId} = smpTHandle c
-  sendHandshake th $ ServerHandshake {sessionId, smpVersionRange = supportedSMPVersions}
+  sendHandshake th $ ServerHandshake {sessionId, smpVersionRange = smpVRange}
  getHandshake th >>= \case
    ClientHandshake {smpVersion, keyHash}
      | keyHash /= kh ->
        throwE $ TEHandshake IDENTITY
-      | smpVersion `isCompatible` supportedSMPVersions -> do
-        pure (th :: THandle c) {thVersion = smpVersion}
+      | smpVersion `isCompatible` smpVRange -> do
+        pure $ smpThHandle th smpVersion
      | otherwise -> throwE $ TEHandshake VERSION

 -- | Client SMP transport handshake.
 --
 -- See https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#appendix-a
-smpClientHandshake :: forall c. Transport c => c -> C.KeyHash -> ExceptT TransportError IO (THandle c)
-smpClientHandshake c keyHash = do
+smpClientHandshake :: forall c. Transport c => c -> C.KeyHash -> VersionRange -> ExceptT TransportError IO (THandle c)
+smpClientHandshake c keyHash smpVRange = do
  let th@THandle {sessionId} = smpTHandle c
  ServerHandshake {sessionId = sessId, smpVersionRange} <- getHandshake th
  if sessionId /= sessId
    then throwE TEBadSession
-    else case smpVersionRange `compatibleVersion` supportedSMPVersions of
+    else case smpVersionRange `compatibleVersion` smpVRange of
      Just (Compatible smpVersion) -> do
        sendHandshake th $ ClientHandshake {smpVersion, keyHash}
-        pure (th :: THandle c) {thVersion = smpVersion}
+        pure $ smpThHandle th smpVersion
      Nothing -> throwE $ TEHandshake VERSION

+smpThHandle :: forall c. THandle c -> Version -> THandle c
+smpThHandle th v = (th :: THandle c) {thVersion = v, batch = v >= 4}
+
 sendHandshake :: (Transport c, Encoding smp) => THandle c -> smp -> ExceptT TransportError IO ()
 sendHandshake th = ExceptT . tPutBlock th . smpEncode

@@ -385,4 +400,4 @@ getHandshake :: (Transport c, Encoding smp) => THandle c -> ExceptT TransportErr
 getHandshake th = ExceptT $ (parse smpP (TEHandshake PARSE) =<<) <$> tGetBlock th

 smpTHandle :: Transport c => c -> THandle c
-smpTHandle c = THandle {connection = c, sessionId = tlsUnique c, blockSize = smpBlockSize, thVersion = 0}
+smpTHandle c = THandle {connection = c, sessionId = tlsUnique c, blockSize = smpBlockSize, thVersion = 0, batch = False}
@@ -1,44 +1,135 @@
+{-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE ScopedTypeVariables #-}

 module Simplex.Messaging.Transport.Client
  ( runTransportClient,
    runTLSTransportClient,
    smpClientHandshake,
+    defaultSMPPort,
+    defaultTransportClientConfig,
+    defaultSocksProxy,
+    TransportClientConfig (..),
+    SocksProxy,
+    TransportHost (..),
+    TransportHosts (..),
+    TransportHosts_ (..),
  )
 where

+import Control.Applicative (optional)
 import Control.Monad.Except
 import Control.Monad.IO.Unlift
+import Data.Aeson (FromJSON (..), ToJSON (..))
+import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import Data.Default (def)
+import Data.List.NonEmpty (NonEmpty (..))
+import qualified Data.List.NonEmpty as L
+import Data.Maybe (fromMaybe)
+import Data.String
+import Data.Word (Word8)
 import qualified Data.X509 as X
 import qualified Data.X509.CertificateStore as XS
 import Data.X509.Validation (Fingerprint (..))
 import qualified Data.X509.Validation as XV
 import GHC.IO.Exception (IOErrorType (..))
 import Network.Socket
+import Network.Socks5
 import qualified Network.TLS as T
 import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Encoding
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Parsers (parseAll, parseString)
 import Simplex.Messaging.Transport
 import Simplex.Messaging.Transport.KeepAlive
+import Simplex.Messaging.Util (bshow, (<$?>))
 import System.IO.Error
+import Text.Read (readMaybe)
 import UnliftIO.Exception (IOException)
 import qualified UnliftIO.Exception as E

+data TransportHost
+  = THIPv4 (Word8, Word8, Word8, Word8)
+  | THOnionHost ByteString
+  | THDomainName HostName
+  deriving (Eq, Ord, Show)
+
+instance Encoding TransportHost where
+  smpEncode = smpEncode . strEncode
+  smpP = parseAll strP <$?> smpP
+
+instance StrEncoding TransportHost where
+  strEncode = \case
+    THIPv4 (a1, a2, a3, a4) -> B.intercalate "." $ map bshow [a1, a2, a3, a4]
+    THOnionHost host -> host
+    THDomainName host -> B.pack host
+  strP =
+    A.choice
+      [ THIPv4 <$> ((,,,) <$> ipNum <*> ipNum <*> ipNum <*> A.decimal),
+        THOnionHost <$> ((<>) <$> A.takeTill (== '.') <*> A.string ".onion"),
+        THDomainName . B.unpack <$> A.takeWhile1 (A.notInClass ":#,;/ ")
+      ]
+    where
+      ipNum = A.decimal <* A.char '.'
+
+instance ToJSON TransportHost where
+  toEncoding = strToJEncoding
+  toJSON = strToJSON
+
+newtype TransportHosts = TransportHosts {thList :: NonEmpty TransportHost}
+
+instance StrEncoding TransportHosts where
+  strEncode = strEncodeList . L.toList . thList
+  strP = TransportHosts . L.fromList <$> strP `A.sepBy1'` A.char ','
+
+newtype TransportHosts_ = TransportHosts_ {thList_ :: [TransportHost]}
+
+instance StrEncoding TransportHosts_ where
+  strEncode = strEncodeList . thList_
+  strP = TransportHosts_ <$> strP `A.sepBy'` A.char ','
+
+instance IsString TransportHost where fromString = parseString strDecode
+
+instance IsString (NonEmpty TransportHost) where fromString = parseString strDecode
+
+data TransportClientConfig = TransportClientConfig
+  { socksProxy :: Maybe SocksProxy,
+    tcpKeepAlive :: Maybe KeepAliveOpts,
+    logTLSErrors :: Bool
+  }
+  deriving (Eq, Show)
+
+defaultTransportClientConfig :: TransportClientConfig
+defaultTransportClientConfig = TransportClientConfig Nothing (Just defaultKeepAliveOpts) True
+
 -- | Connect to passed TCP host:port and pass handle to the client.
-runTransportClient :: (Transport c, MonadUnliftIO m) => HostName -> ServiceName -> Maybe C.KeyHash -> Maybe KeepAliveOpts -> (c -> m a) -> m a
+runTransportClient :: (Transport c, MonadUnliftIO m) => TransportClientConfig -> TransportHost -> ServiceName -> Maybe C.KeyHash -> (c -> m a) -> m a
 runTransportClient = runTLSTransportClient supportedParameters Nothing

-runTLSTransportClient :: (Transport c, MonadUnliftIO m) => T.Supported -> Maybe XS.CertificateStore -> HostName -> ServiceName -> Maybe C.KeyHash -> Maybe KeepAliveOpts -> (c -> m a) -> m a
-runTLSTransportClient tlsParams caStore_ host port keyHash keepAliveOpts client = do
-  let clientParams = mkTLSClientParams tlsParams caStore_ host port keyHash
-  c <- liftIO $ startTCPClient host port clientParams keepAliveOpts
+runTLSTransportClient :: (Transport c, MonadUnliftIO m) => T.Supported -> Maybe XS.CertificateStore -> TransportClientConfig -> TransportHost -> ServiceName -> Maybe C.KeyHash -> (c -> m a) -> m a
+runTLSTransportClient tlsParams caStore_ TransportClientConfig {socksProxy, tcpKeepAlive, logTLSErrors} host port keyHash client = do
+  let hostName = B.unpack $ strEncode host
+      clientParams = mkTLSClientParams tlsParams caStore_ hostName port keyHash
+      connectTCP = case socksProxy of
+        Just proxy -> connectSocksClient proxy $ hostAddr host
+        _ -> connectTCPClient hostName
+  c <- liftIO $ do
+    sock <- connectTCP port
+    mapM_ (setSocketKeepAlive sock) tcpKeepAlive
+    connectTLS (Just hostName) logTLSErrors clientParams sock >>= getClientConnection
  client c `E.finally` liftIO (closeConnection c)
+  where
+    hostAddr = \case
+      THIPv4 addr -> SocksAddrIPV4 $ tupleToHostAddress addr
+      THOnionHost h -> SocksAddrDomainName h
+      THDomainName h -> SocksAddrDomainName $ B.pack h

-startTCPClient :: forall c. Transport c => HostName -> ServiceName -> T.ClientParams -> Maybe KeepAliveOpts -> IO c
-startTCPClient host port clientParams keepAliveOpts = withSocketsDo $ resolve >>= tryOpen err
+connectTCPClient :: HostName -> ServiceName -> IO Socket
+connectTCPClient host port = withSocketsDo $ resolve >>= tryOpen err
  where
    err :: IOException
    err = mkIOError NoSuchThing "no address" Nothing Nothing
@@ -48,20 +139,52 @@ startTCPClient host port clientParams keepAliveOpts = withSocketsDo $ resolve >>
      let hints = defaultHints {addrSocketType = Stream}
       in getAddrInfo (Just hints) (Just host) (Just port)

-    tryOpen :: IOException -> [AddrInfo] -> IO c
+    tryOpen :: IOException -> [AddrInfo] -> IO Socket
    tryOpen e [] = E.throwIO e
    tryOpen _ (addr : as) =
      E.try (open addr) >>= either (`tryOpen` as) pure

-    open :: AddrInfo -> IO c
+    open :: AddrInfo -> IO Socket
    open addr = do
      sock <- socket (addrFamily addr) (addrSocketType addr) (addrProtocol addr)
      connect sock $ addrAddress addr
-      mapM_ (setSocketKeepAlive sock) keepAliveOpts
-      ctx <- connectTLS clientParams sock
-      getClientConnection ctx
+      pure sock

-- readCertificateStore :: FilePath -> IO (Maybe CertificateStore)
+defaultSMPPort :: PortNumber
+defaultSMPPort = 5223
+
+connectSocksClient :: SocksProxy -> SocksHostAddress -> ServiceName -> IO Socket
+connectSocksClient (SocksProxy addr) hostAddr _port = do
+  let port = if null _port then defaultSMPPort else fromMaybe defaultSMPPort $ readMaybe _port
+  fst <$> socksConnect (defaultSocksConf addr) (SocksAddress hostAddr port)
+
+defaultSocksHost :: HostAddress
+defaultSocksHost = tupleToHostAddress (127, 0, 0, 1)
+
+defaultSocksProxy :: SocksProxy
+defaultSocksProxy = SocksProxy $ SockAddrInet 9050 defaultSocksHost
+
+newtype SocksProxy = SocksProxy SockAddr
+  deriving (Eq)
+
+instance Show SocksProxy where show (SocksProxy addr) = show addr
+
+instance StrEncoding SocksProxy where
+  strEncode = B.pack . show
+  strP = do
+    host <- maybe defaultSocksHost tupleToHostAddress <$> optional ipv4P
+    port <- fromMaybe 9050 <$> optional (A.char ':' *> (fromInteger <$> A.decimal))
+    pure . SocksProxy $ SockAddrInet port host
+    where
+      ipv4P = (,,,) <$> ipNum <*> ipNum <*> ipNum <*> A.decimal
+      ipNum = A.decimal <* A.char '.'
+
+instance ToJSON SocksProxy where
+  toJSON = strToJSON
+  toEncoding = strToJEncoding
+
+instance FromJSON SocksProxy where
+  parseJSON = strParseJSON "SocksProxy"

 mkTLSClientParams :: T.Supported -> Maybe XS.CertificateStore -> HostName -> ServiceName -> Maybe C.KeyHash -> T.ClientParams
 mkTLSClientParams supported caStore_ host port keyHash_ = do
@@ -84,7 +207,7 @@ validateCertificateChain (C.KeyHash kh) host port cc@(X.CertificateChain sc@[_,
    x509validate = XV.validate X.HashSHA256 hooks checks certStore cache serviceID cc
      where
        hooks = XV.defaultHooks
-        checks = XV.defaultChecks
+        checks = XV.defaultChecks {XV.checkFQHN = False}
        certStore = XS.makeCertificateStore sc
        cache = XV.exceptionValidationCache [] -- we manually check fingerprint only of the identity certificate (ca.crt)
        serviceID = (host, port)
@@ -19,14 +19,13 @@ import qualified Network.HTTP2.Client as H
 import Network.Socket (HostName, ServiceName)
 import qualified Network.TLS as T
 import Numeric.Natural (Natural)
-import Simplex.Messaging.Transport.Client (runTLSTransportClient)
+import Simplex.Messaging.Transport.Client (TransportClientConfig (..), TransportHost (..), runTLSTransportClient)
 import Simplex.Messaging.Transport.HTTP2 (http2TLSParams, withTlsConfig)
-import Simplex.Messaging.Transport.KeepAlive (KeepAliveOpts)
 import UnliftIO.STM
 import UnliftIO.Timeout

 data HTTP2Client = HTTP2Client
-  { action :: Async (),
+  { action :: Maybe (Async ()),
    connected :: TVar Bool,
    host :: HostName,
    port :: ServiceName,
@@ -43,7 +42,7 @@ data HTTP2Response = HTTP2Response
 data HTTP2ClientConfig = HTTP2ClientConfig
  { qSize :: Natural,
    connTimeout :: Int,
-    tcpKeepAlive :: Maybe KeepAliveOpts,
+    transportConfig :: TransportClientConfig,
    caStoreFile :: FilePath,
    suportedTLSParams :: T.Supported
  }
@@ -54,7 +53,7 @@ defaultHTTP2ClientConfig =
  HTTP2ClientConfig
    { qSize = 64,
      connTimeout = 10000000,
-      tcpKeepAlive = Nothing,
+      transportConfig = TransportClientConfig Nothing Nothing True,
      caStoreFile = "/etc/ssl/cert.pem",
      suportedTLSParams = http2TLSParams
    }
@@ -63,7 +62,7 @@ data HTTP2ClientError = HCResponseTimeout | HCNetworkError | HCNetworkError1 | H
  deriving (Show)

 getHTTP2Client :: HostName -> ServiceName -> HTTP2ClientConfig -> IO () -> IO (Either HTTP2ClientError HTTP2Client)
-getHTTP2Client host port config@HTTP2ClientConfig {tcpKeepAlive, connTimeout, caStoreFile, suportedTLSParams} disconnected =
+getHTTP2Client host port config@HTTP2ClientConfig {transportConfig, connTimeout, caStoreFile, suportedTLSParams} disconnected =
  (atomically mkHTTPS2Client >>= runClient)
    `E.catch` \(e :: IOException) -> pure . Left $ HCIOError e
  where
@@ -71,7 +70,7 @@ getHTTP2Client host port config@HTTP2ClientConfig {tcpKeepAlive, connTimeout, ca
    mkHTTPS2Client = do
      connected <- newTVar False
      reqQ <- newTBQueue $ qSize config
-      pure HTTP2Client {action = undefined, connected, host, port, config, reqQ}
+      pure HTTP2Client {action = Nothing, connected, host, port, config, reqQ}

    runClient :: HTTP2Client -> IO (Either HTTP2ClientError HTTP2Client)
    runClient c = do
@@ -80,11 +79,11 @@ getHTTP2Client host port config@HTTP2ClientConfig {tcpKeepAlive, connTimeout, ca
      when (isNothing caStore) . putStrLn $ "Error loading CertificateStore from " <> caStoreFile
      action <-
        async $
-          runHTTP2Client suportedTLSParams caStore host port tcpKeepAlive (client c cVar)
+          runHTTP2Client suportedTLSParams caStore transportConfig host port (client c cVar)
            `E.finally` atomically (putTMVar cVar $ Left HCNetworkError)
      conn_ <- connTimeout `timeout` atomically (takeTMVar cVar)
      pure $ case conn_ of
-        Just (Right ()) -> Right c {action}
+        Just (Right ()) -> Right c {action = Just action}
        Just (Left e) -> Left e
        Nothing -> Left HCNetworkError1

@@ -111,8 +110,7 @@ getHTTP2Client host port config@HTTP2ClientConfig {tcpKeepAlive, connTimeout, ca

 -- | Disconnects client from the server and terminates client threads.
 closeHTTP2Client :: HTTP2Client -> IO ()
-- TODO disconnect
-closeHTTP2Client = uninterruptibleCancel . action
+closeHTTP2Client = mapM_ uninterruptibleCancel . action

 sendRequest :: HTTP2Client -> Request -> IO (Either HTTP2ClientError HTTP2Response)
 sendRequest HTTP2Client {reqQ, config} req = do
@@ -120,9 +118,9 @@ sendRequest HTTP2Client {reqQ, config} req = do
  atomically $ writeTBQueue reqQ (req, resp)
  maybe (Left HCResponseTimeout) Right <$> (connTimeout config `timeout` atomically (takeTMVar resp))

-runHTTP2Client :: T.Supported -> Maybe XS.CertificateStore -> HostName -> ServiceName -> Maybe KeepAliveOpts -> ((Request -> (Response -> IO ()) -> IO ()) -> IO ()) -> IO ()
-runHTTP2Client tlsParams caStore host port keepAliveOpts client =
-  runTLSTransportClient tlsParams caStore host port Nothing keepAliveOpts $ \c ->
+runHTTP2Client :: T.Supported -> Maybe XS.CertificateStore -> TransportClientConfig -> HostName -> ServiceName -> ((Request -> (Response -> IO ()) -> IO ()) -> IO ()) -> IO ()
+runHTTP2Client tlsParams caStore tcConfig host port client =
+  runTLSTransportClient tlsParams caStore tcConfig (THDomainName host) port Nothing $ \c ->
    withTlsConfig c 16384 (`run` client)
  where
    run = H.run $ ClientConfig "https" (B.pack host) 20
@@ -25,7 +25,8 @@ data HTTP2ServerConfig = HTTP2ServerConfig
    serverSupported :: T.Supported,
    caCertificateFile :: FilePath,
    privateKeyFile :: FilePath,
-    certificateFile :: FilePath
+    certificateFile :: FilePath,
+    logTLSErrors :: Bool
  }
  deriving (Show)

@@ -42,12 +43,12 @@ data HTTP2Server = HTTP2Server
  }

 getHTTP2Server :: HTTP2ServerConfig -> IO HTTP2Server
-getHTTP2Server HTTP2ServerConfig {qSize, http2Port, serverSupported, caCertificateFile, certificateFile, privateKeyFile} = do
+getHTTP2Server HTTP2ServerConfig {qSize, http2Port, serverSupported, caCertificateFile, certificateFile, privateKeyFile, logTLSErrors} = do
  tlsServerParams <- loadSupportedTLSServerParams serverSupported caCertificateFile certificateFile privateKeyFile
  started <- newEmptyTMVarIO
  reqQ <- newTBQueueIO qSize
  action <- async $
-    runHTTP2Server started http2Port tlsServerParams $ \r sendResponse -> do
+    runHTTP2Server started http2Port tlsServerParams logTLSErrors $ \r sendResponse -> do
      reqBody <- getRequestBody r ""
      reqTrailers <- H.getRequestTrailers r
      atomically $ writeTBQueue reqQ HTTP2Request {request = r, reqBody, reqTrailers, sendResponse}
@@ -62,9 +63,9 @@ getHTTP2Server HTTP2ServerConfig {qSize, http2Port, serverSupported, caCertifica
 closeHTTP2Server :: HTTP2Server -> IO ()
 closeHTTP2Server = uninterruptibleCancel . action

-runHTTP2Server :: TMVar Bool -> ServiceName -> T.ServerParams -> HTTP2ServerFunc -> IO ()
-runHTTP2Server started port serverParams http2Server =
-  runTransportServer started port serverParams $ \c -> withTlsConfig c 16384 (`H.run` server)
+runHTTP2Server :: TMVar Bool -> ServiceName -> T.ServerParams -> Bool -> HTTP2ServerFunc -> IO ()
+runHTTP2Server started port serverParams logTLSErrors http2Server =
+  runTransportServer started port serverParams logTLSErrors $ \c -> withTlsConfig c 16384 (`H.run` server)
  where
    server :: Request -> Aux -> (Response -> [PushPromise] -> IO ()) -> IO ()
    server req _aux sendResp = http2Server req (`sendResp` [])
@@ -1,10 +1,15 @@
 {-# LANGUAGE CApiFFI #-}
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE NamedFieldPuns #-}

 module Simplex.Messaging.Transport.KeepAlive where

+import Data.Aeson (FromJSON (..), ToJSON (..))
+import qualified Data.Aeson as J
 import Foreign.C (CInt (..))
+import GHC.Generics (Generic)
 import Network.Socket

 data KeepAliveOpts = KeepAliveOpts
@@ -12,7 +17,9 @@ data KeepAliveOpts = KeepAliveOpts
    keepIntvl :: Int,
    keepCnt :: Int
  }
-  deriving (Show)
+  deriving (Eq, Show, Generic, FromJSON)
+
+instance ToJSON KeepAliveOpts where toEncoding = J.genericToEncoding J.defaultOptions

 defaultKeepAliveOpts :: KeepAliveOpts
 defaultKeepAliveOpts =
@@ -12,20 +12,22 @@ module Simplex.Messaging.Transport.Server
  )
 where

+import Control.Concurrent.STM (stateTVar)
 import Control.Monad.Except
 import Control.Monad.IO.Unlift
 import qualified Crypto.Store.X509 as SX
 import Data.Default (def)
-import Data.Set (Set)
-import qualified Data.Set as S
 import qualified Data.X509 as X
 import Data.X509.Validation (Fingerprint (..))
 import qualified Data.X509.Validation as XV
 import Network.Socket
 import qualified Network.TLS as T
+import Simplex.Messaging.TMap (TMap)
+import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport
 import Simplex.Messaging.Util (catchAll_)
 import System.Exit (exitFailure)
+import System.Mem.Weak (Weak, deRefWeak)
 import UnliftIO.Concurrent
 import qualified UnliftIO.Exception as E
 import UnliftIO.STM
@@ -33,40 +35,33 @@ import UnliftIO.STM
 -- | Run transport server (plain TCP or WebSockets) on passed TCP port and signal when server started and stopped via passed TMVar.
 --
 -- All accepted connections are passed to the passed function.
-runTransportServer :: forall c m. (Transport c, MonadUnliftIO m) => TMVar Bool -> ServiceName -> T.ServerParams -> (c -> m ()) -> m ()
-runTransportServer started port serverParams server = do
+runTransportServer :: forall c m. (Transport c, MonadUnliftIO m) => TMVar Bool -> ServiceName -> T.ServerParams -> Bool -> (c -> m ()) -> m ()
+runTransportServer started port serverParams logTLSErrors server = do
  u <- askUnliftIO
-  liftIO $ do
-    clients <- newTVarIO S.empty
+  liftIO . runTCPServer started port $ \conn ->
    E.bracket
-      (startTCPServer started port)
-      (closeServer started clients)
-      $ \sock -> forever . E.bracketOnError (accept sock) (close . fst) $ \(conn, _peer) -> do
-        -- catchAll_ is needed here in case the connection was closed earlier
-        tid <- forkFinally (connectClient u conn) (const . liftIO $ gracefulClose conn 5000 `catchAll_` pure ())
-        atomically . modifyTVar' clients $ S.insert tid
-  where
-    connectClient :: UnliftIO m -> Socket -> IO ()
-    connectClient u conn =
-      E.bracket
-        (connectTLS serverParams conn >>= getServerConnection)
-        closeConnection
-        (unliftIO u . server)
+      (connectTLS Nothing logTLSErrors serverParams conn >>= getServerConnection)
+      closeConnection
+      (unliftIO u . server)

-- | Run TCP server without TLS - only used in SimpleX Chat
+-- | Run TCP server without TLS
 runTCPServer :: TMVar Bool -> ServiceName -> (Socket -> IO ()) -> IO ()
 runTCPServer started port server = do
-  clients <- newTVarIO S.empty
+  clients <- atomically TM.empty
+  clientId <- newTVarIO 0
  E.bracket
    (startTCPServer started port)
    (closeServer started clients)
    $ \sock -> forever . E.bracketOnError (accept sock) (close . fst) $ \(conn, _peer) -> do
-      tid <- forkFinally (server conn) (const $ gracefulClose conn 5000)
-      atomically . modifyTVar' clients $ S.insert tid
+      -- catchAll_ is needed here in case the connection was closed earlier
+      cId <- atomically $ stateTVar clientId $ \cId -> let cId' = cId + 1 in (cId', cId')
+      let closeConn _ = atomically (TM.delete cId clients) >> gracefulClose conn 5000 `catchAll_` pure ()
+      tId <- mkWeakThreadId =<< server conn `forkFinally` closeConn
+      atomically $ TM.insert cId tId clients

-closeServer :: TMVar Bool -> TVar (Set ThreadId) -> Socket -> IO ()
+closeServer :: TMVar Bool -> TMap Int (Weak ThreadId) -> Socket -> IO ()
 closeServer started clients sock = do
-  readTVarIO clients >>= mapM_ killThread
+  readTVarIO clients >>= mapM_ (deRefWeak >=> mapM_ killThread)
  close sock
  void . atomically $ tryPutTMVar started False

@@ -18,6 +18,7 @@ import Simplex.Messaging.Transport
    TransportError (..),
    TransportPeer (..),
    closeTLS,
+    smpBlockSize,
    trimCR,
    withTlsUnique,
  )
@@ -33,7 +34,7 @@ websocketsOpts :: ConnectionOptions
 websocketsOpts =
  defaultConnectionOptions
    { connectionCompressionOptions = NoCompression,
-      connectionFramePayloadSizeLimit = SizeLimit $ 16 * 1024, -- TODO move to Protocol
+      connectionFramePayloadSizeLimit = SizeLimit $ fromIntegral smpBlockSize,
      connectionMessageDataSizeLimit = SizeLimit 65536
    }

@@ -10,6 +10,9 @@ import Control.Monad.Trans.Except
 import Data.Bifunctor (first)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
+import Data.Text (Text)
+import qualified Data.Text as T
+import Data.Text.Encoding (decodeUtf8With)
 import UnliftIO.Async

 raceAny_ :: MonadUnliftIO m => [m a] -> m ()
@@ -32,6 +35,10 @@ bshow :: Show a => a -> ByteString
 bshow = B.pack . show
 {-# INLINE bshow #-}

+tshow :: Show a => a -> Text
+tshow = T.pack . show
+{-# INLINE tshow #-}
+
 maybeWord :: (a -> ByteString) -> Maybe a -> ByteString
 maybeWord f = maybe "" $ B.cons ' ' . f
 {-# INLINE maybeWord #-}
@@ -56,6 +63,10 @@ tryE :: Monad m => ExceptT e m a -> ExceptT e m (Either e a)
 tryE m = (Right <$> m) `catchE` (pure . Left)
 {-# INLINE tryE #-}

+liftE :: (e -> e') -> ExceptT e IO a -> ExceptT e' IO a
+liftE f a = ExceptT $ first f <$> runExceptT a
+{-# INLINE liftE #-}
+
 ifM :: Monad m => m Bool -> m a -> m a -> m a
 ifM ba t f = ba >>= \b -> if b then t else f
 {-# INLINE ifM #-}
@@ -78,3 +89,12 @@ catchAll = E.catch
 catchAll_ :: IO a -> IO a -> IO a
 catchAll_ a = catchAll a . const
 {-# INLINE catchAll_ #-}
+
+eitherToMaybe :: Either a b -> Maybe b
+eitherToMaybe = either (const Nothing) Just
+{-# INLINE eitherToMaybe #-}
+
+safeDecodeUtf8 :: ByteString -> Text
+safeDecodeUtf8 = decodeUtf8With onError
+  where
+    onError _ _ = Just '?'
@@ -15,6 +15,7 @@ module Simplex.Messaging.Version
    pattern Compatible,
    mkVersionRange,
    safeVersionRange,
+    versionToRange,
    isCompatible,
    proveCompatible,
    compatibleVersion,
@@ -53,6 +54,9 @@ safeVersionRange v1 v2
  | v1 <= v2 = Just $ VRange v1 v2
  | otherwise = Nothing

+versionToRange :: Version -> VersionRange
+versionToRange v = VRange v v
+
 instance Encoding VersionRange where
  smpEncode (VRange v1 v2) = smpEncode (v1, v2)
  smpP =
@@ -17,7 +17,7 @@
 #
 # resolver: ./custom-snapshot.yaml
 # resolver: https://example.com/snapshots/2018-01-01.yaml
-resolver: lts-18.21
+resolver: lts-18.28

 # User packages to be built.
 # Various formats can be used as shown in the example below.
@@ -38,8 +38,8 @@ extra-deps:
  - cryptostore-0.2.1.0@sha256:9896e2984f36a1c8790f057fd5ce3da4cbcaf8aa73eb2d9277916886978c5b19,3881
  - network-3.1.2.7@sha256:e3d78b13db9512aeb106e44a334ab42b7aa48d26c097299084084cb8be5c5568,4888
  - simple-logger-0.1.0@sha256:be8ede4bd251a9cac776533bae7fb643369ebd826eb948a9a18df1a8dd252ff8,1079
-  - tls-1.5.7@sha256:1cc30253a9696b65a9cafc0317fbf09f7dcea15e3a145ed6c9c0e28c632fa23a,6991
-# below dependancies are to update Aeson to 2.0.3
+  - tls-1.6.0@sha256:7ae39373fd2de27fb80e90f76d22aeeb9a074a0ddd120cbd02c9c52f516a9e55,6987
+  # below dependencies are to update Aeson to 2.0.3
  - OneTuple-0.3.1@sha256:a848c096c9d29e82ffdd30a9998aa2931cbccb3a1bc137539d80f6174d31603e,2262
  - attoparsec-0.14.4@sha256:79584bdada8b730cb5138fca8c35c76fbef75fc1d1e01e6b1d815a5ee9843191,5810
  - hashable-1.4.0.2@sha256:0cddd0229d1aac305ea0404409c0bbfab81f075817bd74b8b2929eff58333e55,5005
@@ -48,12 +48,17 @@ extra-deps:
  - time-compat-1.9.6.1@sha256:42d8f2e08e965e1718917d54ad69e1d06bd4b87d66c41dc7410f59313dba4ed1,5033
  - github: simplex-chat/aeson
    commit: 3eb66f9a68f103b5f1489382aad89f5712a64db7
+  # - ../direct-sqlcipher
+  - github: simplex-chat/direct-sqlcipher
+    commit: 34309410eb2069b029b8fc1872deb1e0db123294
+  # - ../sqlcipher-simple
+  - github: simplex-chat/sqlcipher-simple
+    commit: 5e154a2aeccc33ead6c243ec07195ab673137221
  # - ../hs-tls/core
  # - github: simplex-chat/hs-tls
  #   commit: f6cc753611f80af300401cfae63846e9d7c40d9e
  #   subdirs:
  #     - core
-
 # Override default flag values for local packages and extra-deps
 # flags: {}

@@ -12,6 +12,7 @@ module AgentTests (agentTests) where
 import AgentTests.ConnectionRequestTests
 import AgentTests.DoubleRatchetTests (doubleRatchetTests)
 import AgentTests.FunctionalAPITests (functionalAPITests)
+import AgentTests.NotificationTests (notificationTests)
 import AgentTests.SQLiteTests (storeTests)
 import AgentTests.SchemaDump (schemaDumpTest)
 import Control.Concurrent
@@ -21,6 +22,7 @@ import qualified Data.ByteString.Char8 as B
 import Network.HTTP.Types (urlEncode)
 import SMPAgentClient
 import SMPClient (testKeyHash, testPort, testPort2, testStoreLogFile, withSmpServer, withSmpServerStoreLogOn)
+import Simplex.Messaging.Agent.Env.SQLite (AgentDatabase, databaseFile)
 import Simplex.Messaging.Agent.Protocol
 import qualified Simplex.Messaging.Agent.Protocol as A
 import Simplex.Messaging.Encoding.String
@@ -36,6 +38,7 @@ agentTests (ATransport t) = do
  describe "Connection request" connectionRequestTests
  describe "Double ratchet tests" doubleRatchetTests
  describe "Functional API" $ functionalAPITests (ATransport t)
+  describe "Notification tests" $ notificationTests (ATransport t)
  describe "SQLite store" storeTests
  describe "SQLite schema dump" schemaDumpTest
  describe "SMP agent protocol syntax" $ syntaxTests t
@@ -75,10 +78,20 @@ agentTests (ATransport t) = do
      smpAgentTest2_2_1 $ testConcurrentMsgDelivery t
    it "should deliver messages if one of connections has quota exceeded" $
      smpAgentTest2_2_1 $ testMsgDeliveryQuotaExceeded t
+    it "should resume delivering messages after exceeding quota once all messages are received" $
+      smpAgentTest2_2_1 $ testResumeDeliveryQuotaExceeded t
+
+tGetAgent :: Transport c => c -> IO (ATransmissionOrError 'Agent)
+tGetAgent h = do
+  t@(_, _, cmd) <- tGet SAgent h
+  case cmd of
+    Right CONNECT {} -> tGetAgent h
+    Right DISCONNECT {} -> tGetAgent h
+    _ -> pure t

 -- | receive message to handle `h`
 (<#:) :: Transport c => c -> IO (ATransmissionOrError 'Agent)
-(<#:) = tGet SAgent
+(<#:) = tGetAgent

 -- | send transmission `t` to handle `h` and get response
 (#:) :: Transport c => c -> (ByteString, ByteString, ByteString) -> IO (ATransmissionOrError 'Agent)
@@ -112,121 +125,121 @@ h <#= p = (h <#:) >>= (`shouldSatisfy` p . correctTransmission)
 h #:# err = tryGet `shouldReturn` ()
  where
    tryGet =
-      10000 `timeout` tGet SAgent h >>= \case
+      10000 `timeout` tGetAgent h >>= \case
        Just _ -> error err
        _ -> return ()

 pattern Msg :: MsgBody -> ACommand 'Agent
-pattern Msg msgBody <- MSG MsgMeta {integrity = MsgOk} msgBody
+pattern Msg msgBody <- MSG MsgMeta {integrity = MsgOk} _ msgBody

 testDuplexConnection :: Transport c => TProxy c -> c -> c -> IO ()
 testDuplexConnection _ alice bob = do
-  ("1", "bob", Right (INV cReq)) <- alice #: ("1", "bob", "NEW INV")
+  ("1", "bob", Right (INV cReq)) <- alice #: ("1", "bob", "NEW T INV")
  let cReq' = strEncode cReq
-  bob #: ("11", "alice", "JOIN " <> cReq' <> " 14\nbob's connInfo") #> ("11", "alice", OK)
-  ("", "bob", Right (CONF confId "bob's connInfo")) <- (alice <#:)
+  bob #: ("11", "alice", "JOIN T " <> cReq' <> " 14\nbob's connInfo") #> ("11", "alice", OK)
+  ("", "bob", Right (CONF confId _ "bob's connInfo")) <- (alice <#:)
  alice #: ("2", "bob", "LET " <> confId <> " 16\nalice's connInfo") #> ("2", "bob", OK)
  bob <# ("", "alice", INFO "alice's connInfo")
  bob <# ("", "alice", CON)
  alice <# ("", "bob", CON)
  -- message IDs 1 to 3 get assigned to control messages, so first MSG is assigned ID 4
-  alice #: ("3", "bob", "SEND :hello") #> ("3", "bob", MID 5)
-  alice <# ("", "bob", SENT 5)
+  alice #: ("3", "bob", "SEND F :hello") #> ("3", "bob", MID 4)
+  alice <# ("", "bob", SENT 4)
  bob <#= \case ("", "alice", Msg "hello") -> True; _ -> False
-  bob #: ("12", "alice", "ACK 5") #> ("12", "alice", OK)
-  alice #: ("4", "bob", "SEND :how are you?") #> ("4", "bob", MID 6)
-  alice <# ("", "bob", SENT 6)
+  bob #: ("12", "alice", "ACK 4") #> ("12", "alice", OK)
+  alice #: ("4", "bob", "SEND F :how are you?") #> ("4", "bob", MID 5)
+  alice <# ("", "bob", SENT 5)
  bob <#= \case ("", "alice", Msg "how are you?") -> True; _ -> False
-  bob #: ("13", "alice", "ACK 6") #> ("13", "alice", OK)
-  bob #: ("14", "alice", "SEND 9\nhello too") #> ("14", "alice", MID 7)
-  bob <# ("", "alice", SENT 7)
+  bob #: ("13", "alice", "ACK 5") #> ("13", "alice", OK)
+  bob #: ("14", "alice", "SEND F 9\nhello too") #> ("14", "alice", MID 6)
+  bob <# ("", "alice", SENT 6)
  alice <#= \case ("", "bob", Msg "hello too") -> True; _ -> False
-  alice #: ("3a", "bob", "ACK 7") #> ("3a", "bob", OK)
-  bob #: ("15", "alice", "SEND 9\nmessage 1") #> ("15", "alice", MID 8)
-  bob <# ("", "alice", SENT 8)
+  alice #: ("3a", "bob", "ACK 6") #> ("3a", "bob", OK)
+  bob #: ("15", "alice", "SEND F 9\nmessage 1") #> ("15", "alice", MID 7)
+  bob <# ("", "alice", SENT 7)
  alice <#= \case ("", "bob", Msg "message 1") -> True; _ -> False
-  alice #: ("4a", "bob", "ACK 8") #> ("4a", "bob", OK)
+  alice #: ("4a", "bob", "ACK 7") #> ("4a", "bob", OK)
  alice #: ("5", "bob", "OFF") #> ("5", "bob", OK)
-  bob #: ("17", "alice", "SEND 9\nmessage 3") #> ("17", "alice", MID 9)
-  bob <# ("", "alice", MERR 9 (SMP AUTH))
+  bob #: ("17", "alice", "SEND F 9\nmessage 3") #> ("17", "alice", MID 8)
+  bob <# ("", "alice", MERR 8 (SMP AUTH))
  alice #: ("6", "bob", "DEL") #> ("6", "bob", OK)
  alice #:# "nothing else should be delivered to alice"

 testDuplexConnRandomIds :: Transport c => TProxy c -> c -> c -> IO ()
 testDuplexConnRandomIds _ alice bob = do
-  ("1", bobConn, Right (INV cReq)) <- alice #: ("1", "", "NEW INV")
+  ("1", bobConn, Right (INV cReq)) <- alice #: ("1", "", "NEW T INV")
  let cReq' = strEncode cReq
-  ("11", aliceConn, Right OK) <- bob #: ("11", "", "JOIN " <> cReq' <> " 14\nbob's connInfo")
-  ("", bobConn', Right (CONF confId "bob's connInfo")) <- (alice <#:)
+  ("11", aliceConn, Right OK) <- bob #: ("11", "", "JOIN T " <> cReq' <> " 14\nbob's connInfo")
+  ("", bobConn', Right (CONF confId _ "bob's connInfo")) <- (alice <#:)
  bobConn' `shouldBe` bobConn
  alice #: ("2", bobConn, "LET " <> confId <> " 16\nalice's connInfo") =#> \case ("2", c, OK) -> c == bobConn; _ -> False
  bob <# ("", aliceConn, INFO "alice's connInfo")
  bob <# ("", aliceConn, CON)
  alice <# ("", bobConn, CON)
-  alice #: ("2", bobConn, "SEND :hello") #> ("2", bobConn, MID 5)
-  alice <# ("", bobConn, SENT 5)
+  alice #: ("2", bobConn, "SEND F :hello") #> ("2", bobConn, MID 4)
+  alice <# ("", bobConn, SENT 4)
  bob <#= \case ("", c, Msg "hello") -> c == aliceConn; _ -> False
-  bob #: ("12", aliceConn, "ACK 5") #> ("12", aliceConn, OK)
-  alice #: ("3", bobConn, "SEND :how are you?") #> ("3", bobConn, MID 6)
-  alice <# ("", bobConn, SENT 6)
+  bob #: ("12", aliceConn, "ACK 4") #> ("12", aliceConn, OK)
+  alice #: ("3", bobConn, "SEND F :how are you?") #> ("3", bobConn, MID 5)
+  alice <# ("", bobConn, SENT 5)
  bob <#= \case ("", c, Msg "how are you?") -> c == aliceConn; _ -> False
-  bob #: ("13", aliceConn, "ACK 6") #> ("13", aliceConn, OK)
-  bob #: ("14", aliceConn, "SEND 9\nhello too") #> ("14", aliceConn, MID 7)
-  bob <# ("", aliceConn, SENT 7)
+  bob #: ("13", aliceConn, "ACK 5") #> ("13", aliceConn, OK)
+  bob #: ("14", aliceConn, "SEND F 9\nhello too") #> ("14", aliceConn, MID 6)
+  bob <# ("", aliceConn, SENT 6)
  alice <#= \case ("", c, Msg "hello too") -> c == bobConn; _ -> False
-  alice #: ("3a", bobConn, "ACK 7") #> ("3a", bobConn, OK)
-  bob #: ("15", aliceConn, "SEND 9\nmessage 1") #> ("15", aliceConn, MID 8)
-  bob <# ("", aliceConn, SENT 8)
+  alice #: ("3a", bobConn, "ACK 6") #> ("3a", bobConn, OK)
+  bob #: ("15", aliceConn, "SEND F 9\nmessage 1") #> ("15", aliceConn, MID 7)
+  bob <# ("", aliceConn, SENT 7)
  alice <#= \case ("", c, Msg "message 1") -> c == bobConn; _ -> False
-  alice #: ("4a", bobConn, "ACK 8") #> ("4a", bobConn, OK)
+  alice #: ("4a", bobConn, "ACK 7") #> ("4a", bobConn, OK)
  alice #: ("5", bobConn, "OFF") #> ("5", bobConn, OK)
-  bob #: ("17", aliceConn, "SEND 9\nmessage 3") #> ("17", aliceConn, MID 9)
-  bob <# ("", aliceConn, MERR 9 (SMP AUTH))
+  bob #: ("17", aliceConn, "SEND F 9\nmessage 3") #> ("17", aliceConn, MID 8)
+  bob <# ("", aliceConn, MERR 8 (SMP AUTH))
  alice #: ("6", bobConn, "DEL") #> ("6", bobConn, OK)
  alice #:# "nothing else should be delivered to alice"

 testContactConnection :: Transport c => TProxy c -> c -> c -> c -> IO ()
 testContactConnection _ alice bob tom = do
-  ("1", "alice_contact", Right (INV cReq)) <- alice #: ("1", "alice_contact", "NEW CON")
+  ("1", "alice_contact", Right (INV cReq)) <- alice #: ("1", "alice_contact", "NEW T CON")
  let cReq' = strEncode cReq

-  bob #: ("11", "alice", "JOIN " <> cReq' <> " 14\nbob's connInfo") #> ("11", "alice", OK)
-  ("", "alice_contact", Right (REQ aInvId "bob's connInfo")) <- (alice <#:)
+  bob #: ("11", "alice", "JOIN T " <> cReq' <> " 14\nbob's connInfo") #> ("11", "alice", OK)
+  ("", "alice_contact", Right (REQ aInvId _ "bob's connInfo")) <- (alice <#:)
  alice #: ("2", "bob", "ACPT " <> aInvId <> " 16\nalice's connInfo") #> ("2", "bob", OK)
-  ("", "alice", Right (CONF bConfId "alice's connInfo")) <- (bob <#:)
+  ("", "alice", Right (CONF bConfId _ "alice's connInfo")) <- (bob <#:)
  bob #: ("12", "alice", "LET " <> bConfId <> " 16\nbob's connInfo 2") #> ("12", "alice", OK)
  alice <# ("", "bob", INFO "bob's connInfo 2")
  alice <# ("", "bob", CON)
  bob <# ("", "alice", CON)
-  alice #: ("3", "bob", "SEND :hi") #> ("3", "bob", MID 5)
-  alice <# ("", "bob", SENT 5)
+  alice #: ("3", "bob", "SEND F :hi") #> ("3", "bob", MID 4)
+  alice <# ("", "bob", SENT 4)
  bob <#= \case ("", "alice", Msg "hi") -> True; _ -> False
-  bob #: ("13", "alice", "ACK 5") #> ("13", "alice", OK)
+  bob #: ("13", "alice", "ACK 4") #> ("13", "alice", OK)

-  tom #: ("21", "alice", "JOIN " <> cReq' <> " 14\ntom's connInfo") #> ("21", "alice", OK)
-  ("", "alice_contact", Right (REQ aInvId' "tom's connInfo")) <- (alice <#:)
+  tom #: ("21", "alice", "JOIN T " <> cReq' <> " 14\ntom's connInfo") #> ("21", "alice", OK)
+  ("", "alice_contact", Right (REQ aInvId' _ "tom's connInfo")) <- (alice <#:)
  alice #: ("4", "tom", "ACPT " <> aInvId' <> " 16\nalice's connInfo") #> ("4", "tom", OK)
-  ("", "alice", Right (CONF tConfId "alice's connInfo")) <- (tom <#:)
+  ("", "alice", Right (CONF tConfId _ "alice's connInfo")) <- (tom <#:)
  tom #: ("22", "alice", "LET " <> tConfId <> " 16\ntom's connInfo 2") #> ("22", "alice", OK)
  alice <# ("", "tom", INFO "tom's connInfo 2")
  alice <# ("", "tom", CON)
  tom <# ("", "alice", CON)
-  alice #: ("5", "tom", "SEND :hi there") #> ("5", "tom", MID 5)
-  alice <# ("", "tom", SENT 5)
+  alice #: ("5", "tom", "SEND F :hi there") #> ("5", "tom", MID 4)
+  alice <# ("", "tom", SENT 4)
  tom <#= \case ("", "alice", Msg "hi there") -> True; _ -> False
-  tom #: ("23", "alice", "ACK 5") #> ("23", "alice", OK)
+  tom #: ("23", "alice", "ACK 4") #> ("23", "alice", OK)

 testContactConnRandomIds :: Transport c => TProxy c -> c -> c -> IO ()
 testContactConnRandomIds _ alice bob = do
-  ("1", aliceContact, Right (INV cReq)) <- alice #: ("1", "", "NEW CON")
+  ("1", aliceContact, Right (INV cReq)) <- alice #: ("1", "", "NEW T CON")
  let cReq' = strEncode cReq

-  ("11", aliceConn, Right OK) <- bob #: ("11", "", "JOIN " <> cReq' <> " 14\nbob's connInfo")
-  ("", aliceContact', Right (REQ aInvId "bob's connInfo")) <- (alice <#:)
+  ("11", aliceConn, Right OK) <- bob #: ("11", "", "JOIN T " <> cReq' <> " 14\nbob's connInfo")
+  ("", aliceContact', Right (REQ aInvId _ "bob's connInfo")) <- (alice <#:)
  aliceContact' `shouldBe` aliceContact

  ("2", bobConn, Right OK) <- alice #: ("2", "", "ACPT " <> aInvId <> " 16\nalice's connInfo")
-  ("", aliceConn', Right (CONF bConfId "alice's connInfo")) <- (bob <#:)
+  ("", aliceConn', Right (CONF bConfId _ "alice's connInfo")) <- (bob <#:)
  aliceConn' `shouldBe` aliceConn

  bob #: ("12", aliceConn, "LET " <> bConfId <> " 16\nbob's connInfo 2") #> ("12", aliceConn, OK)
@@ -234,17 +247,17 @@ testContactConnRandomIds _ alice bob = do
  alice <# ("", bobConn, CON)
  bob <# ("", aliceConn, CON)

-  alice #: ("3", bobConn, "SEND :hi") #> ("3", bobConn, MID 5)
-  alice <# ("", bobConn, SENT 5)
+  alice #: ("3", bobConn, "SEND F :hi") #> ("3", bobConn, MID 4)
+  alice <# ("", bobConn, SENT 4)
  bob <#= \case ("", c, Msg "hi") -> c == aliceConn; _ -> False
-  bob #: ("13", aliceConn, "ACK 5") #> ("13", aliceConn, OK)
+  bob #: ("13", aliceConn, "ACK 4") #> ("13", aliceConn, OK)

 testRejectContactRequest :: Transport c => TProxy c -> c -> c -> IO ()
 testRejectContactRequest _ alice bob = do
-  ("1", "a_contact", Right (INV cReq)) <- alice #: ("1", "a_contact", "NEW CON")
+  ("1", "a_contact", Right (INV cReq)) <- alice #: ("1", "a_contact", "NEW T CON")
  let cReq' = strEncode cReq
-  bob #: ("11", "alice", "JOIN " <> cReq' <> " 10\nbob's info") #> ("11", "alice", OK)
-  ("", "a_contact", Right (REQ aInvId "bob's info")) <- (alice <#:)
+  bob #: ("11", "alice", "JOIN T " <> cReq' <> " 10\nbob's info") #> ("11", "alice", OK)
+  ("", "a_contact", Right (REQ aInvId _ "bob's info")) <- (alice <#:)
  -- RJCT must use correct contact connection
  alice #: ("2a", "bob", "RJCT " <> aInvId) #> ("2a", "bob", ERR $ CONN NOT_FOUND)
  alice #: ("2b", "a_contact", "RJCT " <> aInvId) #> ("2b", "a_contact", OK)
@@ -254,25 +267,25 @@ testRejectContactRequest _ alice bob = do
 testSubscription :: Transport c => TProxy c -> c -> c -> c -> IO ()
 testSubscription _ alice1 alice2 bob = do
  (alice1, "alice") `connect` (bob, "bob")
-  bob #: ("12", "alice", "SEND 5\nhello") #> ("12", "alice", MID 5)
-  bob <# ("", "alice", SENT 5)
+  bob #: ("12", "alice", "SEND F 5\nhello") #> ("12", "alice", MID 4)
+  bob <# ("", "alice", SENT 4)
  alice1 <#= \case ("", "bob", Msg "hello") -> True; _ -> False
-  alice1 #: ("1", "bob", "ACK 5") #> ("1", "bob", OK)
-  bob #: ("13", "alice", "SEND 11\nhello again") #> ("13", "alice", MID 6)
-  bob <# ("", "alice", SENT 6)
+  alice1 #: ("1", "bob", "ACK 4") #> ("1", "bob", OK)
+  bob #: ("13", "alice", "SEND F 11\nhello again") #> ("13", "alice", MID 5)
+  bob <# ("", "alice", SENT 5)
  alice1 <#= \case ("", "bob", Msg "hello again") -> True; _ -> False
-  alice1 #: ("2", "bob", "ACK 6") #> ("2", "bob", OK)
+  alice1 #: ("2", "bob", "ACK 5") #> ("2", "bob", OK)
  alice2 #: ("21", "bob", "SUB") #> ("21", "bob", OK)
  alice1 <# ("", "bob", END)
-  bob #: ("14", "alice", "SEND 2\nhi") #> ("14", "alice", MID 7)
-  bob <# ("", "alice", SENT 7)
+  bob #: ("14", "alice", "SEND F 2\nhi") #> ("14", "alice", MID 6)
+  bob <# ("", "alice", SENT 6)
  alice2 <#= \case ("", "bob", Msg "hi") -> True; _ -> False
-  alice2 #: ("22", "bob", "ACK 7") #> ("22", "bob", OK)
+  alice2 #: ("22", "bob", "ACK 6") #> ("22", "bob", OK)
  alice1 #:# "nothing else should be delivered to alice1"

 testSubscrNotification :: Transport c => TProxy c -> (ThreadId, ThreadId) -> c -> IO ()
 testSubscrNotification t (server, _) client = do
-  client #: ("1", "conn1", "NEW INV") =#> \case ("1", "conn1", INV {}) -> True; _ -> False
+  client #: ("1", "conn1", "NEW T INV") =#> \case ("1", "conn1", INV {}) -> True; _ -> False
  client #:# "nothing should be delivered to client before the server is killed"
  killThread server
  client <# ("", "", DOWN testSMPServer ["conn1"])
@@ -283,23 +296,23 @@ testMsgDeliveryServerRestart :: Transport c => TProxy c -> c -> c -> IO ()
 testMsgDeliveryServerRestart t alice bob = do
  withServer $ do
    connect (alice, "alice") (bob, "bob")
-    bob #: ("1", "alice", "SEND 2\nhi") #> ("1", "alice", MID 5)
-    bob <# ("", "alice", SENT 5)
+    bob #: ("1", "alice", "SEND F 2\nhi") #> ("1", "alice", MID 4)
+    bob <# ("", "alice", SENT 4)
    alice <#= \case ("", "bob", Msg "hi") -> True; _ -> False
-    alice #: ("11", "bob", "ACK 5") #> ("11", "bob", OK)
+    alice #: ("11", "bob", "ACK 4") #> ("11", "bob", OK)
    alice #:# "nothing else delivered before the server is killed"

  let server = (SMPServer "localhost" testPort2 testKeyHash)
  alice <# ("", "", DOWN server ["bob"])
-  bob #: ("2", "alice", "SEND 11\nhello again") #> ("2", "alice", MID 6)
+  bob #: ("2", "alice", "SEND F 11\nhello again") #> ("2", "alice", MID 5)
  bob #:# "nothing else delivered before the server is restarted"
  alice #:# "nothing else delivered before the server is restarted"

  withServer $ do
-    bob <# ("", "alice", SENT 6)
+    bob <# ("", "alice", SENT 5)
    alice <# ("", "", UP server ["bob"])
    alice <#= \case ("", "bob", Msg "hello again") -> True; _ -> False
-    alice #: ("12", "bob", "ACK 6") #> ("12", "bob", OK)
+    alice #: ("12", "bob", "ACK 5") #> ("12", "bob", OK)

  removeFile testStoreLogFile
  where
@@ -314,33 +327,33 @@ testServerConnectionAfterError t _ = do

      bob <# ("", "", DOWN server ["alice"])
      alice <# ("", "", DOWN server ["bob"])
-      alice #: ("1", "bob", "SEND 5\nhello") #> ("1", "bob", MID 5)
+      alice #: ("1", "bob", "SEND F 5\nhello") #> ("1", "bob", MID 4)
      alice #:# "nothing else delivered before the server is restarted"
      bob #:# "nothing else delivered before the server is restarted"

  withAgent1 $ \bob -> do
    withAgent2 $ \alice -> do
-      bob #: ("1", "alice", "SUB") #> ("1", "alice", ERR (BROKER NETWORK))
-      alice #: ("1", "bob", "SUB") #> ("1", "bob", ERR (BROKER NETWORK))
+      bob #: ("1", "alice", "SUB") =#> \("1", "alice", ERR (BROKER _ e)) -> e == NETWORK || e == TIMEOUT
+      alice #: ("1", "bob", "SUB") =#> \("1", "bob", ERR (BROKER _ e)) -> e == NETWORK || e == TIMEOUT
      withServer $ do
-        alice <# ("", "bob", SENT 5)
+        alice <#= \case ("", "bob", SENT 4) -> True; ("", "", UP s ["bob"]) -> s == server; _ -> False
+        alice <#= \case ("", "bob", SENT 4) -> True; ("", "", UP s ["bob"]) -> s == server; _ -> False
        bob <# ("", "", UP server ["alice"])
        bob <#= \case ("", "alice", Msg "hello") -> True; _ -> False
-        bob #: ("2", "alice", "ACK 5") #> ("2", "alice", OK)
-        alice <# ("", "", UP server ["bob"])
-        alice #: ("1", "bob", "SEND 11\nhello again") #> ("1", "bob", MID 6)
-        alice <# ("", "bob", SENT 6)
+        bob #: ("2", "alice", "ACK 4") #> ("2", "alice", OK)
+        alice #: ("1", "bob", "SEND F 11\nhello again") #> ("1", "bob", MID 5)
+        alice <# ("", "bob", SENT 5)
        bob <#= \case ("", "alice", Msg "hello again") -> True; _ -> False

  removeFile testStoreLogFile
-  removeFile testDB
-  removeFile testDB2
+  removeFile $ databaseFile testDB
+  removeFile $ databaseFile testDB2
  where
    server = SMPServer "localhost" testPort2 testKeyHash
    withServer test' = withSmpServerStoreLogOn (ATransport t) testPort2 (const test') `shouldReturn` ()
    withAgent1 = withAgent agentTestPort testDB
    withAgent2 = withAgent agentTestPort2 testDB2
-    withAgent :: String -> String -> (c -> IO a) -> IO a
+    withAgent :: String -> AgentDatabase -> (c -> IO a) -> IO a
    withAgent agentPort agentDB = withSmpAgentThreadOn_ (ATransport t) (agentPort, testPort2, agentDB) (pure ()) . const . testSMPAgentClientOn agentPort

 testMsgDeliveryAgentRestart :: Transport c => TProxy c -> c -> IO ()
@@ -349,14 +362,14 @@ testMsgDeliveryAgentRestart t bob = do
  withAgent $ \alice -> do
    withServer $ do
      connect (bob, "bob") (alice, "alice")
-      alice #: ("1", "bob", "SEND 5\nhello") #> ("1", "bob", MID 5)
-      alice <# ("", "bob", SENT 5)
+      alice #: ("1", "bob", "SEND F 5\nhello") #> ("1", "bob", MID 4)
+      alice <# ("", "bob", SENT 4)
      bob <#= \case ("", "alice", Msg "hello") -> True; _ -> False
-      bob #: ("11", "alice", "ACK 5") #> ("11", "alice", OK)
+      bob #: ("11", "alice", "ACK 4") #> ("11", "alice", OK)
      bob #:# "nothing else delivered before the server is down"

    bob <# ("", "", DOWN server ["alice"])
-    alice #: ("2", "bob", "SEND 11\nhello again") #> ("2", "bob", MID 6)
+    alice #: ("2", "bob", "SEND F 11\nhello again") #> ("2", "bob", MID 5)
    alice #:# "nothing else delivered before the server is restarted"
    bob #:# "nothing else delivered before the server is restarted"

@@ -366,14 +379,14 @@ testMsgDeliveryAgentRestart t bob = do
      alice <#= \case
        (corrId, "bob", cmd) ->
          (corrId == "3" && cmd == OK)
-            || (corrId == "" && cmd == SENT 6)
+            || (corrId == "" && cmd == SENT 5)
        _ -> False
      bob <# ("", "", UP server ["alice"])
      bob <#= \case ("", "alice", Msg "hello again") -> True; _ -> False
-      bob #: ("12", "alice", "ACK 6") #> ("12", "alice", OK)
+      bob #: ("12", "alice", "ACK 5") #> ("12", "alice", OK)

  removeFile testStoreLogFile
-  removeFile testDB
+  removeFile $ databaseFile testDB
  where
    withServer test' = withSmpServerStoreLogOn (ATransport t) testPort2 (const test') `shouldReturn` ()
    withAgent = withSmpAgentThreadOn_ (ATransport t) (agentTestPort, testPort, testDB) (pure ()) . const . testSMPAgentClientOn agentTestPort
@@ -382,10 +395,10 @@ testConcurrentMsgDelivery :: Transport c => TProxy c -> c -> c -> IO ()
 testConcurrentMsgDelivery _ alice bob = do
  connect (alice, "alice") (bob, "bob")

-  ("1", "bob2", Right (INV cReq)) <- alice #: ("1", "bob2", "NEW INV")
+  ("1", "bob2", Right (INV cReq)) <- alice #: ("1", "bob2", "NEW T INV")
  let cReq' = strEncode cReq
-  bob #: ("11", "alice2", "JOIN " <> cReq' <> " 14\nbob's connInfo") #> ("11", "alice2", OK)
-  ("", "bob2", Right (CONF _confId "bob's connInfo")) <- (alice <#:)
+  bob #: ("11", "alice2", "JOIN T " <> cReq' <> " 14\nbob's connInfo") #> ("11", "alice2", OK)
+  ("", "bob2", Right (CONF _confId _ "bob's connInfo")) <- (alice <#:)
  -- below commands would be needed to accept bob's connection, but alice does not
  -- alice #: ("2", "bob", "LET " <> _confId <> " 16\nalice's connInfo") #> ("2", "bob", OK)
  -- bob <# ("", "alice", INFO "alice's connInfo")
@@ -394,15 +407,15 @@ testConcurrentMsgDelivery _ alice bob = do

  -- the first connection should not be blocked by the second one
  sendMessage (alice, "alice") (bob, "bob") "hello"
-  -- alice #: ("2", "bob", "SEND :hello") #> ("2", "bob", MID 1)
+  -- alice #: ("2", "bob", "SEND F :hello") #> ("2", "bob", MID 1)
  -- alice <# ("", "bob", SENT 1)
  -- bob <#= \case ("", "alice", Msg "hello") -> True; _ -> False
  -- bob #: ("12", "alice", "ACK 1") #> ("12", "alice", OK)
-  bob #: ("14", "alice", "SEND 9\nhello too") #> ("14", "alice", MID 6)
-  bob <# ("", "alice", SENT 6)
+  bob #: ("14", "alice", "SEND F 9\nhello too") #> ("14", "alice", MID 5)
+  bob <# ("", "alice", SENT 5)
  -- if delivery is blocked it won't go further
  alice <#= \case ("", "bob", Msg "hello too") -> True; _ -> False
-  alice #: ("3", "bob", "ACK 6") #> ("3", "bob", OK)
+  alice #: ("3", "bob", "ACK 5") #> ("3", "bob", OK)

 testMsgDeliveryQuotaExceeded :: Transport c => TProxy c -> c -> c -> IO ()
 testMsgDeliveryQuotaExceeded _ alice bob = do
@@ -411,20 +424,46 @@ testMsgDeliveryQuotaExceeded _ alice bob = do
  forM_ [1 .. 4 :: Int] $ \i -> do
    let corrId = bshow i
        msg = "message " <> bshow i
-    (_, "bob", Right (MID mId)) <- alice #: (corrId, "bob", "SEND :" <> msg)
+    (_, "bob", Right (MID mId)) <- alice #: (corrId, "bob", "SEND F :" <> msg)
    alice <#= \case ("", "bob", SENT m) -> m == mId; _ -> False
-  (_, "bob", Right (MID _)) <- alice #: ("5", "bob", "SEND :over quota")
+  (_, "bob", Right (MID _)) <- alice #: ("5", "bob", "SEND F :over quota")

-  alice #: ("1", "bob2", "SEND :hello") #> ("1", "bob2", MID 5)
+  alice #: ("1", "bob2", "SEND F :hello") #> ("1", "bob2", MID 4)
  -- if delivery is blocked it won't go further
-  alice <# ("", "bob2", SENT 5)
+  alice <# ("", "bob2", SENT 4)
+
+testResumeDeliveryQuotaExceeded :: Transport c => TProxy c -> c -> c -> IO ()
+testResumeDeliveryQuotaExceeded _ alice bob = do
+  connect (alice, "alice") (bob, "bob")
+  forM_ [1 .. 4 :: Int] $ \i -> do
+    let corrId = bshow i
+        msg = "message " <> bshow i
+    (_, "bob", Right (MID mId)) <- alice #: (corrId, "bob", "SEND F :" <> msg)
+    alice <#= \case ("", "bob", SENT m) -> m == mId; _ -> False
+  ("5", "bob", Right (MID 8)) <- alice #: ("5", "bob", "SEND F :over quota")
+  alice #:# "the last message not sent yet"
+  bob <#= \case ("", "alice", Msg "message 1") -> True; _ -> False
+  bob #: ("1", "alice", "ACK 4") #> ("1", "alice", OK)
+  alice #:# "the last message not sent"
+  bob <#= \case ("", "alice", Msg "message 2") -> True; _ -> False
+  bob #: ("2", "alice", "ACK 5") #> ("2", "alice", OK)
+  alice #:# "the last message not sent"
+  bob <#= \case ("", "alice", Msg "message 3") -> True; _ -> False
+  bob #: ("3", "alice", "ACK 6") #> ("3", "alice", OK)
+  alice #:# "the last message not sent"
+  bob <#= \case ("", "alice", Msg "message 4") -> True; _ -> False
+  bob #: ("4", "alice", "ACK 7") #> ("4", "alice", OK)
+  alice <# ("", "bob", SENT 8)
+  bob <#= \case ("", "alice", Msg "over quota") -> True; _ -> False
+  -- message 8 is skipped because of alice agent sending "QCONT" message
+  bob #: ("5", "alice", "ACK 9") #> ("5", "alice", OK)

 connect :: forall c. Transport c => (c, ByteString) -> (c, ByteString) -> IO ()
 connect (h1, name1) (h2, name2) = do
-  ("c1", _, Right (INV cReq)) <- h1 #: ("c1", name2, "NEW INV")
+  ("c1", _, Right (INV cReq)) <- h1 #: ("c1", name2, "NEW T INV")
  let cReq' = strEncode cReq
-  h2 #: ("c2", name1, "JOIN " <> cReq' <> " 5\ninfo2") #> ("c2", name1, OK)
-  ("", _, Right (CONF connId "info2")) <- (h1 <#:)
+  h2 #: ("c2", name1, "JOIN T " <> cReq' <> " 5\ninfo2") #> ("c2", name1, OK)
+  ("", _, Right (CONF connId _ "info2")) <- (h1 <#:)
  h1 #: ("c3", name2, "LET " <> connId <> " 5\ninfo1") #> ("c3", name2, OK)
  h2 <# ("", name1, INFO "info1")
  h2 <# ("", name1, CON)
@@ -432,20 +471,20 @@ connect (h1, name1) (h2, name2) = do

 sendMessage :: Transport c => (c, ConnId) -> (c, ConnId) -> ByteString -> IO ()
 sendMessage (h1, name1) (h2, name2) msg = do
-  ("m1", name2', Right (MID mId)) <- h1 #: ("m1", name2, "SEND :" <> msg)
+  ("m1", name2', Right (MID mId)) <- h1 #: ("m1", name2, "SEND F :" <> msg)
  name2' `shouldBe` name2
  h1 <#= \case ("", n, SENT m) -> n == name2 && m == mId; _ -> False
-  ("", name1', Right (MSG MsgMeta {recipient = (msgId', _)} msg')) <- (h2 <#:)
+  ("", name1', Right (MSG MsgMeta {recipient = (msgId', _)} _ msg')) <- (h2 <#:)
  name1' `shouldBe` name1
  msg' `shouldBe` msg
  h2 #: ("m2", name1, "ACK " <> bshow msgId') =#> \case ("m2", n, OK) -> n == name1; _ -> False

 -- connect' :: forall c. Transport c => c -> c -> IO (ByteString, ByteString)
 -- connect' h1 h2 = do
--   ("c1", conn2, Right (INV cReq)) <- h1 #: ("c1", "", "NEW INV")
+--   ("c1", conn2, Right (INV cReq)) <- h1 #: ("c1", "", "NEW T INV")
 --   let cReq' = strEncode cReq
--   ("c2", conn1, Right OK) <- h2 #: ("c2", "", "JOIN " <> cReq' <> " 5\ninfo2")
--   ("", _, Right (REQ connId "info2")) <- (h1 <#:)
+--   ("c2", conn1, Right OK) <- h2 #: ("c2", "", "JOIN T " <> cReq' <> " 5\ninfo2")
+--   ("", _, Right (REQ connId _ "info2")) <- (h1 <#:)
 --   h1 #: ("c3", conn2, "ACPT " <> connId <> " 5\ninfo1") =#> \case ("c3", c, OK) -> c == conn2; _ -> False
 --   h2 <# ("", conn1, INFO "info1")
 --   h2 <# ("", conn1, CON)
@@ -461,17 +500,17 @@ syntaxTests t = do
  describe "NEW" $ do
    describe "valid" $ do
      -- TODO: add tests with defined connection id
-      it "with correct parameter" $ ("211", "", "NEW INV") >#>= \case ("211", _, "INV" : _) -> True; _ -> False
+      it "with correct parameter" $ ("211", "", "NEW T INV") >#>= \case ("211", _, "INV" : _) -> True; _ -> False
    describe "invalid" $ do
      -- TODO: add tests with defined connection id
-      it "with incorrect parameter" $ ("222", "", "NEW hi") >#> ("222", "", "ERR CMD SYNTAX")
+      it "with incorrect parameter" $ ("222", "", "NEW T hi") >#> ("222", "", "ERR CMD SYNTAX")

  describe "JOIN" $ do
    describe "valid" $ do
      it "using same server as in invitation" $
        ( "311",
          "a",
-          "JOIN https://simpex.chat/invitation#/?smp=smp%3A%2F%2F"
+          "JOIN T https://simpex.chat/invitation#/?smp=smp%3A%2F%2F"
            <> urlEncode True "LcJUMfVhwD8yxjAiSaDzzGF3-kLG4Uh0Fl_ZIjrRwjI="
            <> "%40localhost%3A5001%2F3456-w%3D%3D%23"
            <> urlEncode True sampleDhKey
@@ -11,7 +11,7 @@ import Simplex.Messaging.Agent.Protocol
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Crypto.Ratchet
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Protocol (ProtocolServer (..), smpClientVRange)
+import Simplex.Messaging.Protocol (ProtocolServer (..), supportedSMPClientVRange)
 import Simplex.Messaging.Version
 import Test.Hspec

@@ -19,22 +19,25 @@ uri :: String
 uri = "smp.simplex.im"

 srv :: SMPServer
-srv =
-  ProtocolServer
-    { host = "smp.simplex.im",
-      port = "5223",
-      keyHash = C.KeyHash "\215m\248\251"
-    }
+srv = SMPServer "smp.simplex.im" "5223" (C.KeyHash "\215m\248\251")

-queue :: SMPQueueUri
-queue =
-  SMPQueueUri
+queueAddr :: SMPQueueAddress
+queueAddr =
+  SMPQueueAddress
    { smpServer = srv,
      senderId = "\223\142z\251",
-      clientVRange = smpClientVRange,
      dhPublicKey = testDhKey
    }

+queueAddrNoPort :: SMPQueueAddress
+queueAddrNoPort = queueAddr {smpServer = srv {port = ""}}
+
+queue :: SMPQueueUri
+queue = SMPQueueUri supportedSMPClientVRange queueAddr
+
+queueV1 :: SMPQueueUri
+queueV1 = SMPQueueUri (mkVersionRange 1 1) queueAddr
+
 testDhKey :: C.PublicKeyX25519
 testDhKey = "MCowBQYDK2VuAyEAjiswwI3O/NlS8Fk3HJUW870EY2bAwmttMBsvRB9eV3o="

@@ -48,18 +51,19 @@ connReqData :: ConnReqUriData
 connReqData =
  ConnReqUriData
    { crScheme = simplexChat,
-      crAgentVRange = smpAgentVRange,
-      crSmpQueues = [queue]
+      crAgentVRange = mkVersionRange 1 1,
+      crSmpQueues = [queueV1],
+      crClientData = Nothing
    }

 testDhPubKey :: C.PublicKeyX448
 testDhPubKey = "MEIwBQYDK2VvAzkAmKuSYeQ/m0SixPDS8Wq8VBaTS1cW+Lp0n0h4Diu+kUpR+qXx4SDJ32YGEFoGFGSbGPry5Ychr6U="

 testE2ERatchetParams :: E2ERatchetParamsUri 'C.X448
-testE2ERatchetParams = E2ERatchetParamsUri e2eEncryptVRange testDhPubKey testDhPubKey
+testE2ERatchetParams = E2ERatchetParamsUri (mkVersionRange 1 1) testDhPubKey testDhPubKey

-testE2ERatchetParams13 :: E2ERatchetParamsUri 'C.X448
-testE2ERatchetParams13 = E2ERatchetParamsUri (mkVersionRange 1 3) testDhPubKey testDhPubKey
+testE2ERatchetParams12 :: E2ERatchetParamsUri 'C.X448
+testE2ERatchetParams12 = E2ERatchetParamsUri supportedE2EEncryptVRange testDhPubKey testDhPubKey

 connectionRequest :: AConnectionRequestUri
 connectionRequest =
@@ -70,41 +74,61 @@ connectionRequest12 :: AConnectionRequestUri
 connectionRequest12 =
  ACR SCMInvitation $
    CRInvitationUri
-      connReqData {crAgentVRange = mkVersionRange 1 2, crSmpQueues = [queue, queue]}
-      testE2ERatchetParams13
+      connReqData {crAgentVRange = supportedSMPAgentVRange, crSmpQueues = [queueV1, queueV1]}
+      testE2ERatchetParams12
+
+connectionRequestClientDataEmpty :: AConnectionRequestUri
+connectionRequestClientDataEmpty =
+  ACR SCMInvitation $
+    CRInvitationUri connReqData {crClientData = Just "{}"} testE2ERatchetParams
+
+connectionRequestClientData :: AConnectionRequestUri
+connectionRequestClientData =
+  ACR SCMInvitation $
+    CRInvitationUri connReqData {crClientData = Just "{\"type\":\"group_link\", \"group_link_id\":\"abc\"}"} testE2ERatchetParams

 connectionRequestTests :: Spec
 connectionRequestTests =
  describe "connection request parsing / serializing" $ do
    it "should serialize SMP queue URIs" $ do
-      strEncode (queue :: SMPQueueUri) {smpServer = srv {port = ""}}
-        `shouldBe` "smp://1234-w==@smp.simplex.im/3456-w==#" <> testDhKeyStr
+      strEncode (queue :: SMPQueueUri) {queueAddress = queueAddrNoPort}
+        `shouldBe` "smp://1234-w==@smp.simplex.im/3456-w==#/?v=1-2&dh=" <> testDhKeyStrUri
      strEncode queue {clientVRange = mkVersionRange 1 2}
-        `shouldBe` "smp://1234-w==@smp.simplex.im:5223/3456-w==#" <> testDhKeyStr
+        `shouldBe` "smp://1234-w==@smp.simplex.im:5223/3456-w==#/?v=1-2&dh=" <> testDhKeyStrUri
    it "should parse SMP queue URIs" $ do
-      strDecode ("smp://1234-w==@smp.simplex.im/3456-w==#/?v=1&dh=" <> testDhKeyStr)
-        `shouldBe` Right (queue :: SMPQueueUri) {smpServer = srv {port = ""}}
+      strDecode ("smp://1234-w==@smp.simplex.im/3456-w==#/?v=1-2&dh=" <> testDhKeyStr)
+        `shouldBe` Right (queue :: SMPQueueUri) {queueAddress = queueAddrNoPort}
      strDecode ("smp://1234-w==@smp.simplex.im/3456-w==#" <> testDhKeyStr)
-        `shouldBe` Right (queue :: SMPQueueUri) {smpServer = srv {port = ""}}
+        `shouldBe` Right (queueV1 :: SMPQueueUri) {queueAddress = queueAddrNoPort}
      strDecode ("smp://1234-w==@smp.simplex.im:5223/3456-w==#" <> testDhKeyStr)
-        `shouldBe` Right queue
-      strDecode ("smp://1234-w==@smp.simplex.im:5223/3456-w==#" <> testDhKeyStr <> "/?v=1&extra_param=abc")
-        `shouldBe` Right queue
-      strDecode ("smp://1234-w==@smp.simplex.im:5223/3456-w==#/?extra_param=abc&v=1-2&dh=" <> testDhKeyStr)
-        `shouldBe` Right queue {clientVRange = mkVersionRange 1 2}
+        `shouldBe` Right queueV1
      strDecode ("smp://1234-w==@smp.simplex.im:5223/3456-w==#" <> testDhKeyStr <> "/?v=1-2&extra_param=abc")
-        `shouldBe` Right queue {clientVRange = mkVersionRange 1 2}
+        `shouldBe` Right queue
+      strDecode ("smp://1234-w==@smp.simplex.im:5223/3456-w==#/?extra_param=abc&v=1&dh=" <> testDhKeyStr)
+        `shouldBe` Right queueV1
+      strDecode ("smp://1234-w==@smp.simplex.im:5223/3456-w==#" <> testDhKeyStr <> "/?v=1&extra_param=abc")
+        `shouldBe` Right queueV1
    it "should serialize connection requests" $ do
      strEncode connectionRequest
-        `shouldBe` "https://simplex.chat/invitation#/?v=1&smp=smp%3A%2F%2F1234-w%3D%3D%40smp.simplex.im%3A5223%2F3456-w%3D%3D%23"
-        <> testDhKeyStrUri
+        `shouldBe` "https://simplex.chat/invitation#/?v=1&smp=smp%3A%2F%2F1234-w%3D%3D%40smp.simplex.im%3A5223%2F3456-w%3D%3D%23%2F%3Fv%3D1%26dh%3D"
+        <> urlEncode True testDhKeyStrUri
        <> "&e2e=v%3D1%26x3dh%3DMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D%2CMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D"
      strEncode connectionRequest12
-        `shouldBe` "https://simplex.chat/invitation#/?v=1-2&smp=smp%3A%2F%2F1234-w%3D%3D%40smp.simplex.im%3A5223%2F3456-w%3D%3D%23"
-        <> testDhKeyStrUri
-        <> "%2Csmp%3A%2F%2F1234-w%3D%3D%40smp.simplex.im%3A5223%2F3456-w%3D%3D%23"
-        <> testDhKeyStrUri
-        <> "&e2e=v%3D1-3%26x3dh%3DMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D%2CMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D"
+        `shouldBe` "https://simplex.chat/invitation#/?v=1-2&smp=smp%3A%2F%2F1234-w%3D%3D%40smp.simplex.im%3A5223%2F3456-w%3D%3D%23%2F%3Fv%3D1%26dh%3D"
+        <> urlEncode True testDhKeyStrUri
+        <> "%2Csmp%3A%2F%2F1234-w%3D%3D%40smp.simplex.im%3A5223%2F3456-w%3D%3D%23%2F%3Fv%3D1%26dh%3D"
+        <> urlEncode True testDhKeyStrUri
+        <> "&e2e=v%3D1-2%26x3dh%3DMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D%2CMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D"
+      strEncode connectionRequestClientDataEmpty
+        `shouldBe` "https://simplex.chat/invitation#/?v=1&smp=smp%3A%2F%2F1234-w%3D%3D%40smp.simplex.im%3A5223%2F3456-w%3D%3D%23%2F%3Fv%3D1%26dh%3D"
+        <> urlEncode True testDhKeyStrUri
+        <> "&e2e=v%3D1%26x3dh%3DMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D%2CMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D"
+        <> "&data=%7B%7D"
+      strEncode connectionRequestClientData
+        `shouldBe` "https://simplex.chat/invitation#/?v=1&smp=smp%3A%2F%2F1234-w%3D%3D%40smp.simplex.im%3A5223%2F3456-w%3D%3D%23%2F%3Fv%3D1%26dh%3D"
+        <> urlEncode True testDhKeyStrUri
+        <> "&e2e=v%3D1%26x3dh%3DMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D%2CMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D"
+        <> "&data=%7B%22type%22%3A%22group_link%22%2C%20%22group_link_id%22%3A%22abc%22%7D"
    it "should parse connection requests" $ do
      strDecode
        ( "https://simplex.chat/invitation#/?smp=smp%3A%2F%2F1234-w%3D%3D%40smp.simplex.im%3A5223%2F3456-w%3D%3D%23"
@@ -132,8 +156,24 @@ connectionRequestTests =
            <> testDhKeyStrUri
            <> "%2Csmp%3A%2F%2F1234-w%3D%3D%40smp.simplex.im%3A5223%2F3456-w%3D%3D%23%2F%3Fv%3D1%26dh%3D"
            <> testDhKeyStrUri
-            <> "&e2e=extra_key%3Dnew%26v%3D1-3%26x3dh%3DMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D%2CMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D"
+            <> "&e2e=extra_key%3Dnew%26v%3D1-2%26x3dh%3DMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D%2CMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D"
            <> "&some_new_param=abc"
            <> "&v=1-2"
        )
        `shouldBe` Right connectionRequest12
+      strDecode
+        ( "https://simplex.chat/invitation#/?smp=smp%3A%2F%2F1234-w%3D%3D%40smp.simplex.im%3A5223%2F3456-w%3D%3D%23%2F%3Fv%3D1%26dh%3D"
+            <> testDhKeyStrUri
+            <> "&e2e=v%3D1%26x3dh%3DMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D%2CMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D"
+            <> "&data=%7B%7D"
+            <> "&v=1-1"
+        )
+        `shouldBe` Right connectionRequestClientDataEmpty
+      strDecode
+        ( "https://simplex.chat/invitation#/?smp=smp%3A%2F%2F1234-w%3D%3D%40smp.simplex.im%3A5223%2F3456-w%3D%3D%23%2F%3Fv%3D1%26dh%3D"
+            <> testDhKeyStrUri
+            <> "&e2e=v%3D1%26x3dh%3DMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D%2CMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D"
+            <> "&data=%7B%22type%22%3A%22group_link%22%2C%20%22group_link_id%22%3A%22abc%22%7D"
+            <> "&v=1-1"
+        )
+        `shouldBe` Right connectionRequestClientData
@@ -46,6 +46,9 @@ doubleRatchetTests = do
    it "should agree the same ratchet parameters" $ do
      testX3dh C.SX25519
      testX3dh C.SX448
+    it "should agree the same ratchet parameters with version 1" $ do
+      testX3dhV1 C.SX25519
+      testX3dhV1 C.SX448

 paddedMsgLen :: Int
 paddedMsgLen = 100
@@ -56,7 +59,7 @@ fullMsgLen = 1 + fullHeaderLen + C.authTagSize + paddedMsgLen
 testMessageHeader :: Expectation
 testMessageHeader = do
  (k, _) <- C.generateKeyPair' @X25519
-  let hdr = MsgHeader {msgMaxVersion = e2eEncryptVersion, msgDHRs = k, msgPN = 0, msgNs = 0}
+  let hdr = MsgHeader {msgMaxVersion = currentE2EEncryptVersion, msgDHRs = k, msgPN = 0, msgNs = 0}
  parseAll (smpP @(MsgHeader 'X25519)) (smpEncode hdr) `shouldBe` Right hdr

 pattern Decrypted :: ByteString -> Either CryptoError (Either CryptoError ByteString)
@@ -168,8 +171,16 @@ testEncodeDecode x = do

 testX3dh :: forall a. (AlgorithmI a, DhAlgorithm a) => C.SAlgorithm a -> IO ()
 testX3dh _ = do
-  (pkBob1, pkBob2, e2eBob) <- generateE2EParams @a e2eEncryptVersion
-  (pkAlice1, pkAlice2, e2eAlice) <- generateE2EParams @a e2eEncryptVersion
+  (pkBob1, pkBob2, e2eBob) <- generateE2EParams @a currentE2EEncryptVersion
+  (pkAlice1, pkAlice2, e2eAlice) <- generateE2EParams @a currentE2EEncryptVersion
+  let paramsBob = x3dhSnd pkBob1 pkBob2 e2eAlice
+      paramsAlice = x3dhRcv pkAlice1 pkAlice2 e2eBob
+  paramsAlice `shouldBe` paramsBob
+
+testX3dhV1 :: forall a. (AlgorithmI a, DhAlgorithm a) => C.SAlgorithm a -> IO ()
+testX3dhV1 _ = do
+  (pkBob1, pkBob2, e2eBob) <- generateE2EParams @a 1
+  (pkAlice1, pkAlice2, e2eAlice) <- generateE2EParams @a 1
  let paramsBob = x3dhSnd pkBob1 pkBob2 e2eAlice
      paramsAlice = x3dhRcv pkAlice1 pkAlice2 e2eBob
  paramsAlice `shouldBe` paramsBob
@@ -189,13 +200,13 @@ withRatchets test = do

 initRatchets :: (AlgorithmI a, DhAlgorithm a) => IO (Ratchet a, Ratchet a)
 initRatchets = do
-  (pkBob1, pkBob2, e2eBob) <- generateE2EParams e2eEncryptVersion
-  (pkAlice1, pkAlice2, e2eAlice) <- generateE2EParams e2eEncryptVersion
+  (pkBob1, pkBob2, e2eBob) <- generateE2EParams currentE2EEncryptVersion
+  (pkAlice1, pkAlice2, e2eAlice) <- generateE2EParams currentE2EEncryptVersion
  let paramsBob = x3dhSnd pkBob1 pkBob2 e2eAlice
      paramsAlice = x3dhRcv pkAlice1 pkAlice2 e2eBob
  (_, pkBob3) <- C.generateKeyPair'
-  let bob = initSndRatchet (C.publicKey pkAlice2) pkBob3 paramsBob
-      alice = initRcvRatchet pkAlice2 paramsAlice
+  let bob = initSndRatchet supportedE2EEncryptVRange (C.publicKey pkAlice2) pkBob3 paramsBob
+      alice = initRcvRatchet supportedE2EEncryptVRange pkAlice2 paramsAlice
  pure (alice, bob)

 encrypt_ :: AlgorithmI a => (Ratchet a, SkippedMsgKeys) -> ByteString -> IO (Either CryptoError (ByteString, Ratchet a, SkippedMsgDiff))
--- a/Show More
+++ b/Show More