WIP

2026-08-30 16:18:24 +00:00 · 2024-05-12 21:19:27 +03:00
118 changed files with 3470 additions and 10884 deletions
@@ -49,7 +49,7 @@ jobs:
        run: cabal build --enable-tests

      - name: Test
-        timeout-minutes: 40
+        timeout-minutes: 30
        shell: bash
        run: cabal test --test-show-details=direct

@@ -63,7 +63,7 @@ jobs:
          mv $(cabal list-bin xftp) xftp-ubuntu-${{ matrix.platform_name}}

      - name: Build changelog
-        if: startsWith(github.ref, 'refs/tags/v') && matrix.os == 'ubuntu-22.04'
+        if: startsWith(github.ref, 'refs/tags/v') && matrix.os == 'ubuntu-20.04'
        id: build_changelog
        uses: mikepenz/release-changelog-builder-action@v1
        with:
@@ -75,7 +75,7 @@ jobs:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Create release
-        if: startsWith(github.ref, 'refs/tags/v') && matrix.ghc != '8.10.7'
+        if: startsWith(github.ref, 'refs/tags/v') && matrix.os == 'ubuntu-20.04' && matrix.ghc == '9.6.3'
        uses: softprops/action-gh-release@v1
        with:
          body: |
@@ -1,39 +1,3 @@
-# 5.8.0
-
-Version 5.8.0.10
-
-SMP server and client:
- protocol extension to forward messages to the destination servers, to protect sending client IP address and transport session.
-
-Agent:
- process timed out subscription responses to reduce the number of resubscriptions.
- avoid sending messages and commands when waiting for response timed out (except batched SUB and DEL commands).
- fix issue with stuck message reception on slow connection (when response to ACK timed out, and the new message was not processed until resubscribed).
- fix issue when temporary file sending or receiving error was treated as permanent.
-
-SMP server:
- include OK responses to all batched SUB requests to reduce subscription timeouts.
-
-XFTP server:
- report file upload timeout as TIMEOUT, to avoid delivery failure.
-
-# 5.7.6
-
-XFTP agent:
- treat XFTP handshake timeouts and network errors as temporary, to retry file operations.
-
-# 5.7.5
-
-SMP agent:
- fail if non-unique connection IDs are passed to sendMessages (to prevent client errors and deadlocks).
-
-# 5.7.4
-
-SMP agent:
- remove re-subscription timeouts (as they are tracked per operation, and could cause failed subscriptions).
- reconnect XFTP clients when network settings changes.
- fix lock contention resulting in stuck subscriptions on network change.
-
 # 5.7.3

 SMP/NTF protocol:
@@ -1,9 +1,10 @@
+{-# LANGUAGE LambdaCase #-}
+
 module Main where

 import Control.Logger.Simple
 import Simplex.Messaging.Server.CLI (getEnvPath)
 import Simplex.Messaging.Server.Main
-import qualified Static

 defaultCfgPath :: FilePath
 defaultCfgPath = "/etc/opt/simplex"
@@ -19,4 +20,4 @@ main = do
  setLogLevel LogDebug
  cfgPath <- getEnvPath "SMP_SERVER_CFG_PATH" defaultCfgPath
  logPath <- getEnvPath "SMP_SERVER_LOG_PATH" defaultLogPath
-  withGlobalLogging logCfg $ smpServerCLI_ Static.generateSite Static.serveStaticFiles cfgPath logPath
+  withGlobalLogging logCfg $ smpServerCLI cfgPath logPath
@@ -1 +0,0 @@
-../link.html
@@ -1 +0,0 @@
-../link.html
@@ -1,26 +0,0 @@
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-.dark .sub-menu .no-hover {
-  color: #fff !important;
-}
-
-.dark .sub-menu li:hover {
-  color: #66D9E2;
-}
-
-.sub-menu li:hover {
-  color: #0053D0;
-}
-
-.sub-menu {
-  transition: all .3s ease !important;
-}
-
-.nav-link span svg,
-header nav {
-  transition: all 0.5s ease;
-}
-
-.nav-link:hover span svg {
-  transform: rotate(180deg);
-}
-
-@media (min-width:1024px) {
-
-  .nav-link:hover .sub-menu,
-  .nav-link:focus-within .sub-menu {
-    visibility: visible;
-    opacity: 1;
-    margin-top: 0;
-  }
-}
-
-@media (max-width: 1024px) {
-  .sub-menu {
-    max-height: 0;
-    transform: translateY(-10px);
-    transition: all .7s ease !important;
-  }
-
-  .active .sub-menu {
-    max-height: 600px;
-    transform: translateY(0px);
-    opacity: 1;
-    visibility: visible;
-    margin-top: 0;
-  }
-
-  header nav {
-    visibility: hidden;
-    opacity: 0;
-    transform: translateX(100%);
-  }
-
-  header nav.open {
-    visibility: visible;
-    opacity: 1;
-    transform: translateX(0);
-  }
-}
-
-.lock-scroll {
-  overflow: hidden;
-}
-
-/* hero */
-header {
-  transition: all .7s ease;
-}
-
-.primary-header {
-  background: linear-gradient(270deg, #0053D0 35.85%, #0197FF 94.78%);
-  -webkit-background-clip: text;
-  -webkit-text-fill-color: transparent;
-  background-clip: text;
-  text-shadow: 0px 4px 74px #e9e7e2;
-}
-
-.dark .primary-header {
-  background: linear-gradient(270deg, #70F0F9 100%, #70F0F9 100%);
-  -webkit-background-clip: text;
-  -webkit-text-fill-color: transparent;
-  background-clip: text;
-  text-shadow: none;
-}
-
-.secondary-header {
-  color: #606c71;
-  text-shadow: 0px 4px 74px #e9e7e2;
-}
-
-.dark .secondary-header {
-  color: #fff;
-  text-shadow: none;
-}
-
-.description {
-  width: 31rem;
-}
-
-p a {
-  color: #0053D0;
-  text-decoration: underline;
-  text-underline-offset: 2px;
-}
-
-.dark p a {
-  color: #70F0F9;
-}
-
-/* For Contact & Invitation Page */
-.primary-header-contact {
-  background: linear-gradient(251.16deg, #53c1ff 1.1%, #0053d0 100.82%);
-  -webkit-background-clip: text;
-  -webkit-text-fill-color: transparent;
-  background-clip: text;
-  text-shadow: 0px 4px 74px #e9e7e2;
-}
-
-.dark .primary-header-contact {
-  background: linear-gradient(270deg, #70F0F9 100%, #70F0F9 100%);
-  -webkit-background-clip: text;
-  -webkit-text-fill-color: transparent;
-  background-clip: text;
-  text-shadow: none;
-}
-
-.secondary-header-contact {
-  text-shadow: 0px 4px 74px #e9e7e2;
-}
-
-.dark .secondary-header-contact {
-  text-shadow: none;
-}
-
-.content_copy_with_tooltip {
-  background-color: #f8f8f6;
-  border-radius: 50px;
-  padding-bottom: 4px;
-  padding-top: 8px;
-  margin-top: 16px;
-  margin-bottom: 16px;
-}
-
-.content_copy_with_tooltip .tooltip {
-  vertical-align: -6px;
-}
-
-.content_copy_with_tooltip .content {
-  font-size: 15px;
-}
-
-.contact-tab>.contact-tab-content,
-.job-tab>.job-tab-content {
-  opacity: 0;
-  max-height: 0;
-  transition: all 0.5s ease;
-  visibility: hidden;
-  transform: translateY(10px);
-  overflow: hidden;
-}
-
-.contact-tab svg,
-.job-tab svg {
-  transform: rotate(-180deg);
-  transition: all .5s ease;
-}
-
-.contact-tab.active>.contact-tab-content,
-.job-tab.active>.job-tab-content {
-  opacity: 1;
-  max-height: 300px;
-  visibility: visible;
-  transform: translateY(0px);
-}
-
-.for-tablet .contact-tab.active>.contact-tab-content,
-.for-tablet .job-tab.active>.job-tab-content {
-  min-height: 450px;
-}
-
-.contact-tab.active svg,
-.contact-tab:hover svg,
-.job-tab.active svg,
-.job-tab:hover svg {
-  transform: rotate(0deg);
-}
-
-.d-none-if-js-disabled {
-  display: none !important;
-}
@@ -1,11 +0,0 @@
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@@ -1,176 +0,0 @@
-{-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE NamedFieldPuns #-}
-{-# LANGUAGE OverloadedStrings #-}
-
-module Static where
-
-import Control.Logger.Simple
-import Control.Monad
-import Data.ByteString (ByteString)
-import qualified Data.ByteString as B
-import Data.Maybe (fromMaybe)
-import Data.String (fromString)
-import Data.Text.Encoding (encodeUtf8)
-import Network.Wai.Application.Static as S
-import Network.Wai.Handler.Warp as W
-import qualified Network.Wai.Handler.WarpTLS as W
-import Simplex.Messaging.Encoding.String (strEncode)
-import Simplex.Messaging.Server.Information
-import Simplex.Messaging.Server.Main (EmbeddedWebParams (..), WebHttpsParams (..))
-import Simplex.Messaging.Transport.Client (TransportHost (..))
-import Simplex.Messaging.Util (tshow)
-import Static.Embedded as E
-import System.Directory (createDirectoryIfMissing)
-import System.FilePath
-import UnliftIO.Concurrent (forkFinally)
-
-serveStaticFiles :: EmbeddedWebParams -> IO ()
-serveStaticFiles EmbeddedWebParams {webStaticPath, webHttpPort, webHttpsParams} = do
-  forM_ webHttpPort $ \port -> flip forkFinally (\e -> logError $ "HTTP server crashed: " <> tshow e) $ do
-    logInfo $ "Serving static site on port " <> tshow port
-    W.runSettings (mkSettings port) (S.staticApp $ S.defaultFileServerSettings webStaticPath)
-  forM_ webHttpsParams $ \WebHttpsParams {port, cert, key} -> flip forkFinally (\e -> logError $ "HTTPS server crashed: " <> tshow e) $ do
-    logInfo $ "Serving static site on port " <> tshow port <> " (TLS)"
-    W.runTLS (W.tlsSettings cert key) (mkSettings port) (S.staticApp $ S.defaultFileServerSettings webStaticPath)
-  where
-    mkSettings port = setPort port defaultSettings
-
-generateSite :: ServerInformation -> Maybe TransportHost -> FilePath -> IO ()
-generateSite si onionHost sitePath = do
-  createDirectoryIfMissing True sitePath
-  B.writeFile (sitePath </> "index.html") $ serverInformation si onionHost
-  createDirectoryIfMissing True $ sitePath </> "media"
-  forM_ E.mediaContent $ \(path, bs) -> B.writeFile (sitePath </> "media" </> path) bs
-  createDirectoryIfMissing True $ sitePath </> "contact"
-  B.writeFile (sitePath </> "contact" </> "index.html") E.linkHtml
-  createDirectoryIfMissing True $ sitePath </> "invitation"
-  B.writeFile (sitePath </> "invitation" </> "index.html") E.linkHtml
-  logInfo $ "Generated static site contents at " <> tshow sitePath
-
-serverInformation :: ServerInformation -> Maybe TransportHost -> ByteString
-serverInformation ServerInformation {config, information} onionHost = render E.indexHtml substs
-  where
-    substs = substConfig <> maybe [] substInfo information <> [("onionHost", strEncode <$> onionHost)]
-    substConfig =
-      [ ( "persistence",
-          Just $ case persistence config of
-            SPMMemoryOnly -> "In-memory only"
-            SPMQueues -> "Queues"
-            SPMMessages -> "Queues and messages"
-        ),
-        ("messageExpiration", Just $ maybe "Never" (fromString . timedTTLText) $ messageExpiration config),
-        ("statsEnabled", Just . yesNo $ statsEnabled config),
-        ("newQueuesAllowed", Just . yesNo $ newQueuesAllowed config),
-        ("basicAuthEnabled", Just . yesNo $ basicAuthEnabled config)
-      ]
-    yesNo True = "Yes"
-    yesNo False = "No"
-    substInfo spi =
-      concat
-        [ basic,
-          maybe [("usageConditions", Nothing), ("usageAmendments", Nothing)] conds (usageConditions spi),
-          maybe [("operator", Nothing)] operatorE (operator spi),
-          maybe [("admin", Nothing)] admin (adminContacts spi),
-          maybe [("complaints", Nothing)] complaints (complaintsContacts spi),
-          maybe [("hosting", Nothing)] hostingE (hosting spi),
-          server
-        ]
-      where
-        basic =
-          [ ("sourceCode", Just . encodeUtf8 $ sourceCode spi),
-            ("website", encodeUtf8 <$> website spi)
-          ]
-        conds ServerConditions {conditions, amendments} =
-          [ ("usageConditions", Just $ encodeUtf8 conditions),
-            ("usageAmendments", encodeUtf8 <$> amendments)
-          ]
-        operatorE Entity {name, country} =
-          [ ("operator", Just ""),
-            ("operatorEntity", Just $ encodeUtf8 name),
-            ("operatorCountry", encodeUtf8 <$> country)
-          ]
-        admin ServerContactAddress {simplex, email, pgp} =
-          [ ("admin", Just ""),
-            ("adminSimplex", strEncode <$> simplex),
-            ("adminEmail", encodeUtf8 <$> email),
-            ("adminPGP", encodeUtf8 . pkURI <$> pgp),
-            ("adminPGPFingerprint", encodeUtf8 . pkFingerprint <$> pgp)
-          ]
-        complaints ServerContactAddress {simplex, email, pgp} =
-          [ ("complaints", Just ""),
-            ("complaintsSimplex", strEncode <$> simplex),
-            ("complaintsEmail", encodeUtf8 <$> email),
-            ("complaintsPGP", encodeUtf8 . pkURI <$> pgp),
-            ("complaintsPGPFingerprint", encodeUtf8 . pkFingerprint <$> pgp)
-          ]
-        hostingE Entity {name, country} =
-          [ ("hosting", Just ""),
-            ("hostingEntity", Just $ encodeUtf8 name),
-            ("hostingCountry", encodeUtf8 <$> country)
-          ]
-        server =
-          [ ("serverCountry", fmap encodeUtf8 $ serverCountry =<< information)
-          ]
-
-- Copy-pasted from simplex-chat Simplex.Chat.Types.Preferences
-{-# INLINE timedTTLText #-}
-timedTTLText :: (Integral i, Show i) => i -> String
-timedTTLText 0 = "0 sec"
-timedTTLText ttl = do
-  let (m', s) = ttl `quotRem` 60
-      (h', m) = m' `quotRem` 60
-      (d', h) = h' `quotRem` 24
-      (mm, d) = d' `quotRem` 30
-  unwords $
-    [mms mm | mm /= 0]
-      <> [ds d | d /= 0]
-      <> [hs h | h /= 0]
-      <> [ms m | m /= 0]
-      <> [ss s | s /= 0]
-  where
-    ss s = show s <> " sec"
-    ms m = show m <> " min"
-    hs 1 = "1 hour"
-    hs h = show h <> " hours"
-    ds 1 = "1 day"
-    ds 7 = "1 week"
-    ds 14 = "2 weeks"
-    ds d = show d <> " days"
-    mms 1 = "1 month"
-    mms mm = show mm <> " months"
-
-- | Rewrite source with provided substitutions
-render :: ByteString -> [(ByteString, Maybe ByteString)] -> ByteString
-render src = \case
-  [] -> src
-  (label, content') : rest -> render (section_ label content' src) rest
-
-- | Rewrite section content inside @<x-label>...</x-label>@ markers.
-- Markers are always removed when found. Closing marker is mandatory.
-- If content is absent, whole section is removed.
-- Section content is delegated to `item_`. If no sections found, the whole source is delegated.
-section_ :: ByteString -> Maybe ByteString -> ByteString -> ByteString
-section_ label content' src =
-  case B.breakSubstring startMarker src of
-    (_, "") -> item_ label (fromMaybe "" content') src -- no section, just replace items
-    (before, afterStart') ->
-      -- found section start, search for end too
-      case B.breakSubstring endMarker $ B.drop (B.length startMarker) afterStart' of
-        (_, "") -> error $ "missing section end: " <> show endMarker
-        (inside, next') ->
-          let next = B.drop (B.length endMarker) next'
-           in case content' of
-                Nothing -> before <> next -- collapse section
-                Just content -> before <> item_ label content inside <> section_ label content' next
-  where
-    startMarker = "<x-" <> label <> ">"
-    endMarker = "</x-" <> label <> ">"
-
-- | Replace all occurences of @${label}@ with provided content.
-item_ :: ByteString -> ByteString -> ByteString -> ByteString
-item_ label content' src =
-  case B.breakSubstring marker src of
-    (done, "") -> done
-    (before, after') -> before <> content' <> item_ label content' (B.drop (B.length marker) after')
-  where
-    marker = "${" <> label <> "}"
@@ -1,15 +0,0 @@
-{-# LANGUAGE TemplateHaskell #-}
-
-module Static.Embedded where
-
-import Data.FileEmbed (embedDir, embedFile)
-import Data.ByteString (ByteString)
-
-indexHtml :: ByteString
-indexHtml = $(embedFile "apps/smp-server/static/index.html")
-
-linkHtml :: ByteString
-linkHtml = $(embedFile "apps/smp-server/static/link.html")
-
-mediaContent :: [(FilePath, ByteString)]
-mediaContent = $(embedDir "apps/smp-server/static/media/")
@@ -1,23 +0,0 @@
-common:
-  corrId - random BS, used as CbNonce
-  entityId - p2r tlsUniq
-
-# setup
-s->p: "proxy", uri, auth?
-  # unless connected
-  p->r: "p_handshake"
-  p<-r: "r_key", tls-signed dh pub
-s<-r: "r_key", tls-signed dh pub # reply entityId contains tlsUniq
-
-# working
-s ; generate random dh priv, make shared secret
-s->p: s2r("forward", random dh pub, SEND command blob)
-  p->r: p2r("forward", random dh pub, s2r("forward", ...)))
-    r->c@ "msg", ...
-  p<-r: p2r("r_res", s2r("ok" / "error", error))
-s<-p@ s2r("ok" / "error", error)
-
-# expired
-  p<-r@ p2r("error", "key expired")
-s<-p@ "error", "key expired"
-s ; reconnect
@@ -1,5 +1,5 @@
 name: simplexmq
-version: 5.8.0.10
+version: 5.7.4.0
 synopsis: SimpleXMQ message broker
 description: |
  This package includes <./docs/Simplex-Messaging-Server.html server>,
@@ -22,8 +22,6 @@ extra-source-files:
  - CHANGELOG.md
  - cbits/sha512.h
  - cbits/sntrup761.h
-  - apps/smp-server/static/*.html
-  - apps/smp-server/static/media/*

 dependencies:
  - aeson == 2.2.*
@@ -47,7 +45,6 @@ dependencies:
  - direct-sqlcipher == 2.3.*
  - directory == 1.3.*
  - filepath == 1.4.*
-  - hashable == 1.4.*
  - hourglass == 0.2.*
  - http-types == 0.12.*
  - http2 >= 4.2.2 && < 4.3
@@ -62,7 +59,6 @@ dependencies:
  - network-udp >= 0.0 && < 0.1
  - optparse-applicative >= 0.15 && < 0.17
  - process == 1.6.*
-  - psqueues == 0.2.8.*
  - random >= 1.1 && < 1.3
  - simple-logger == 0.1.*
  - socks == 0.6.*
@@ -75,6 +71,7 @@ dependencies:
  - transformers == 0.6.*
  - unliftio == 0.2.*
  - unliftio-core == 0.2.*
+  - unordered-containers
  - websockets == 0.12.*
  - yaml == 0.11.*
  - zstd == 0.1.3.*
@@ -89,9 +86,6 @@ flags:
    manual: True
    default: True

-# cpp-options:
-#   - -Dslow_servers
-
 when:
  - condition: flag(swift)
    cpp-options:
@@ -117,16 +111,10 @@ library:

 executables:
  smp-server:
-    source-dirs:
-    - apps/smp-server
-    - apps/smp-server/web
+    source-dirs: apps/smp-server
    main: Main.hs
    dependencies:
-      - file-embed
      - simplexmq
-      - wai-app-static
-      - warp
-      - warp-tls
    ghc-options:
      - -threaded
      - -rtsopts
@@ -149,6 +137,15 @@ executables:
      - -threaded
      - -rtsopts

+  smp-agent:
+    source-dirs: apps/smp-agent
+    main: Main.hs
+    dependencies:
+      - simplexmq
+    ghc-options:
+      - -threaded
+      - -rtsopts
+
  xftp:
    source-dirs: apps/xftp
    main: Main.hs
@@ -181,31 +178,12 @@ tests:

 ghc-options:
  # - -haddock
-  - -Weverything
-  - -Wno-missing-exported-signatures
-  - -Wno-missing-import-lists
-  - -Wno-missed-specialisations
-  - -Wno-all-missed-specialisations
-  - -Wno-unsafe
-  - -Wno-safe
-  - -Wno-missing-local-signatures
-  - -Wno-missing-kind-signatures
-  - -Wno-missing-deriving-strategies
-  - -Wno-monomorphism-restriction
-  - -Wno-prepositive-qualified-module
-  - -Wno-unused-packages
-  - -Wno-implicit-prelude
-  - -Wno-missing-safe-haskell-mode
-  - -Wno-missing-export-lists
-  - -Wno-partial-fields
+  - -Wall
  - -Wcompat
-  - -Werror=incomplete-record-updates
  - -Werror=incomplete-patterns
-  - -Werror=incomplete-uni-patterns
-  - -Werror=missing-methods
-  - -Werror=tabs
  - -Wredundant-constraints
  - -Wincomplete-record-updates
+  - -Wincomplete-uni-patterns
  - -Wunused-type-patterns
  - -O2

@@ -2,9 +2,9 @@

 ## Problem

-SMP protocol relays are chosen and can be controlled by the message recipients. It means that the recipients can find out IP addresses of message senders by modifying SMP relay code (or by using proxies and timing correlation), unless the senders use VPN or some overlay network. Tor is an adequate solution in most cases to mitigate it, but it requires additional technical knowledge to install and configure (even installing Orbot on Android is seen as "complex" by many users), and reduces usability because of higher latency.
+SMP protocol relays are chosen and can be controlled by the message recipients. It means that the recipients can find out IP addresses of message senders by modifying SMP relay code (or by using proxies and timing correlation), unless the senders use VPN or some overlay network. Tor is an audequate solution in most cases to mitigate it, but it requires additional technical knowledge to install and configure (even installing Orbot on Android is seen as "complex" by many users), and reduces usability because of higher latency.

-The lack of in-built IP address protection is the main concern of many users, particularly given that most people do not realize that it is lacking by default - without transport protection SimpleX is not perceived as a "whole product".
+The lack of in-built IP address protection is the main concern of many users, particularly given that most people do not realise that it is lacking by default - without transport protection SimpleX is not perceived as a "whole product".

 Similarly, XFTP protocol relays are chosen by senders, and they can be used to detect file recipients' IP addresses.

@@ -43,7 +43,7 @@ Overall, this is not a viable or even appropriate option for the current stage.

 3. SMP / XFTP proxy.

-Introduce SMP and XFTP protocol extensions to allow message senders and file recipients to delegate the tasks of sending messages and receiving files to the proxies, so that peer-chosen relays can only observe IP addresses of the proxies and not of the users.
+Introduce SMP and XFTP protocol extenstions to allow message senders and file recipients to delegate the tasks of sending messages and receiving files to the proxies, so that peer-chosen relays can only observe IP addresses of the proxies and not of the users.

 Pros:
 - no dependency on and lower latency than via Tor
@@ -68,7 +68,7 @@ Below considers this design.

 2. SMP proxy should not be able to observe queue addresses and their count on the destination relays. This requirement is not needed for XFTP proxies, as each file chunk is downloaded only once, so there is no need to hide its address.

-3. There must be no identifiers and ciphertext in common in outgoing and incoming traffic inside TLS (the current designs have this quality).
+3. There must be no identifiers and cyphertext in common in outgoing and incoming traffic inside TLS (the current designs have this quality).

 4. Traffic between the client and destination relays must be e2e encrypted, with MITM-by-proxy mitigated, relying on the relay identity (certificate fingerprint), ideally without any additional fingerprint in relay address.

@@ -97,11 +97,11 @@ This would also reduce the difference in how the traffic looks to the observer -

 The flow of the messages will be:

-1. Client requests proxy to create session with the relay by sending `PRXY` command with the SMP relay address and optional proxy basic AUTH (below). It should be possible to batch multiple session requests into one block, to reduce traffic.
+1. Client requests proxy to create session with the relay by sending `server` command with the SMP relay address and optional proxy basic AUTH (below). It should be possible to batch multiple session requests into one block, to reduce traffic.

-2. Proxy connects to SMP relay, negotiating a shared secret via a handshake headers - it will be used to encrypt all sender blocks inside TLS (proxy-relay encryption). DH key returned by SMP relay in handshake will also be used to encrypt client commands, combining it with random per-command keys (sender-relay encryption, to hide metadata sent to the destination relay from proxy).
+2. Proxy connects to SMP relay, negotiating a shared secret in the handshake that will be used to encrypt all sender blocks inside TLS (proxy-relay encryption). SMP relay also returns in handshake its temporary DH key to agree e2e encryption with the client (sender-relay encryption, to hide metadata sent to the destination relay from proxy).

-3. Proxy replies to sender with `PKEY` message using "entityId" transmission field to indicate session ID for using in further requests, relay DH key for _s2r_ encryption with the client - this key is signed with the TLS online private key associated with the certificate (its fingerprint is included in the relay address), and the TLS session ID between proxy and relay (this session ID must be used in transmissions, to mitigate replay attacks as before).
+3. Proxy replies with `server_id` command including relay session ID to identify it in further requests, relay DH key for e2e encryption with the client - this key is signed with the TLS online private key associated with the certificate (its fingerprint is included in the relay address), and the TLS session ID between proxy and relay (this session ID must be used in transmissions, to mitigate replay attacks as before).

 A possible attack here is that proxy can use this TLS session to replay commands received from the client. Possibly, it could be mitigated with a bloom filter per proxy/SMP relay connection that would reject the repeated DH keys (that need to be used for replay), and also with DH key expiration (this mitigation should allow some acceptable rate of false positives from the bloom filter).

@@ -113,11 +113,11 @@ It is important that the same public key from destination relay is returned to a

 *Unrelated cosideration for SMP protocol privacy improvement*: instead of signing commands to the destination relay, the sender could have a ratchet per queue agreed with the destination relay that would simply use authenticated encryption with per-message symmetric key to encrypt the message on the way to relay, and this encryption would be used as a proof of sender.

-4. Now the client sends `PFWD` to proxy, which it then forwards to SMP relay as `RFWD`, applying _p2r_ encryption layer.
+4. Now the client sends `forward` to proxy, which it then forwards to SMP relay, applying additional encryption layer.

-5. SMP relay sends `RRES` to proxy applying _p2r_ encryption layer, which it then forwards to the client as `PRES`, removing the _p2r_ encryption layer.
+5. SMP relay sends `response` to proxy applying additional encryption layer, which it then forwards to the client removing the additional encryption layer.

-Effectively it works as a simplified two-hop onion routing with the first relay (proxy) chosen by the sending client and the second relay chosen by the recipient, not only protecting senders' IP addresses from the recipients' relays, but also preventing recipients' relays from correlating senders' traffic to different queues, as TLS session is owned by the proxy now and it mixes the traffic from multiple senders. To correlate traffic to users, proxy and relay would have to combine their information. SMP relays are still able to correlate traffic to receiving users via transport session.
+Effectively it works as a simplified two-hop onion routing with the first relay (proxy) chosen by the sending client and the second relay chosen by the recipient, not only protecting senders' IP addresses from the recipients' relays, but also preventing recipients relays from correlating senders' traffic to different queues, as TLS session is owned by the proxy now and it mixes the traffic from multiple senders. To correlate traffic to users, proxy and relay would have to combine their information. SMP relays are still able to correlate traffic to receiving users via transport session.

 Sequence diagram for sending the message via SMP proxy:

@@ -126,33 +126,33 @@ Sequence diagram for sending the message via SMP proxy:
 |  sending  |               |    SMP    |                     |    SMP    |              | receiving |
 |  client   |               |   proxy   |                     |   relay   |              |  client   |
 -------------               -------------                     -------------              -------------
-     |           `PRXY`           |                                 |                          |
-     | -------------------------> |                                 |                          |
+     |       `server`             |                                 |                          |
+     | -------------------------> |   create TLS session, get keys  |                          |
     |                            | ------------------------------> |                          |
-     |                            |          SMP handshake          |                          |
-     |                            | <------------------------------ |                          |
-     |           `PKEY`           |                                 |                          |
+     |        `server_id`         |       (if doesn't exist)        |                          |
     | <------------------------- |                                 |                          |
     |                            |                                 |                          |
-     |        `PFWD` (s2r)        |                                 |                          |
-     | -------------------------> |                                 |                          |
-     |                            |           `RFWD` (p2r)          |                          |
+     | TLS(F:s2r(SEND(e2e(msg)))) |                                 |                          |
+     | -------------------------> | TLS(F:p2r(s2r(SEND(e2e(msg))))) |                          |
     |                            | ------------------------------> |                          |
-     |                            |           `RRES` (p2r)          |                          |
-     |                            | <------------------------------ |                          |
-     |        `PRES` (s2r)        |                                 |           `MSG`          |
-     | <------------------------- |                                 | -----------------------> |
-     |                            |                                 |           `ACK`          |
+     |                            |                                 |                          |
+     |                            |     TLS(R:p2r(s2r(OK/ERR)))     |                          |
+     |     TLS(R:s2r(OK/ERR))     | <------------------------------ |                          |
+     | <------------------------- |                                 | TLS(MSG(r2c(e2e(msg))))  |
+     |                            |                                 | -----------------------> |
+     |                            |                                 |                          |
+     |                            |                                 |        TLS(ACK)          |
     |                            |                                 | <----------------------- |
     |                            |                                 |                          |
     |                            |                                 |                          |
+
 ```

-Below diagram shows the encrypttion layers for `PFWD`/`RFWD` commands and `RRES`/`PRES` responses:
+Below diagram shows the encrypttion layers for `forward` and `response` commands:

- s2r (added) - encryption between client and SMP relay, with relay key returned in relay handshake, with MITM by proxy mitigated by verifying the certificate fingerprint included in the relay address.
+- s2r (added) - encryption between client and SMP relay, with relay key returned in server_id command, with MITM by proxy mitigated by verifying the certificate fingerprint included in the relay address.
 - e2e (exists now) - end-to-end encryption per SMP queue, with double ratchet e2e encryption inside it.
- p2r (added) - additional encryption between proxy and SMP relay with the shared secret agreed in the handshake, to mitigate traffic correlation inside TLS.
+- p2r (added) - additional encryption between proxy and SMP relay with key agreed in the handshake, to mitigate traffic correlation inside TLS. This key could also be signed by the same certificate, if we don't want to rely on TLS security.
 - r2c (exists now) additional encryption between SMP relay and client to prevent traffic correlation inside TLS.

 ```
@@ -167,85 +167,30 @@ Below diagram shows the encrypttion layers for `PFWD`/`RFWD` commands and `RRES`
 -----------------             -----------------  -- TLS --  -----------------             -----------------
 ```

-Question: should proxy declare its role in handshake? When proxy connects to SMP relay it would indicate in the handshake that it will act as a proxy and the SMP relay would expect the same `forward` commands and reply with `response`s.
+When proxy connects to SMP relay it would indicate in the handshake that it will use proxy protocol and the SMP relay would expect the same `forward` commands and reply with `response`s.

-Common SMP transmission format (v4), for reference:
+Below syntax aims to fit in 16kb block using spare capacity in SMP protocol.

 ```abnf
-paddedTransmission = <padded(transmission), 16384>
-transmission = signature signed
-signature = 0 ; empty signatures here
-signed = sessionIdentifier corrId entityId (smpCommand / brokerMsg)
+proxy_block = padded(proxy_transmission, 16384)
+proxy_transmission = corr_id relay_session_id proxy_command
+corr_id = length *8 OCTET
+proxy_command = server / server_id / forward / response / error
+server = "S" address [relay_basic_auth] ; creates transport session between proxy and relay
+server_id = "I" relay_session_id tls_session_id signed_relay_key ;
+    ; session_id is the TLS session ID between proxy and relay, it has to be included inside encrypted block to prevent replay attacks
+forward = %s"F" random_dh_pub_key encrypted_block ; it's important that a new key is used for each command, to prevent any correlation by proxy or by destination relay
+response = %s"R" encrypted_block; response received from the destination SMP relay
+relay_session_id = length *8 OCTET
+error = %s"E" error
 ```

- `corrId` is fully random each time and used as a nonce for encrypted blocks.
- `entityId` carries tlsUniq from the current proxy-to-relay connection.
- `smpCommand` gets extended with `s2p_command / p2r_command`.
- `brokerMsg` gets extended with `r_key / r_response`.
+The overhead is: 1+8 (corrId) + 1+8 (relay_session_id) + 1 (command) + 1+32 (random_dh_pub_key) + 2 (original length) + 16 (auth tag for e2e encryption) + 16 (auth tag for proxy to relay encryption) = 86 bytes. The reserve for sent messages in SMP is ~84 bytes, so it should about fit with some reduced bytes somewhere.

-```abnf
-s2p_command = proxy / forward
-p2r_command = p_handshake ; forward is
-proxy = %s"PRXY" SP relayUri SP basicAuth
-relayUri = length %s"smp://" serverIdentity "@" srvHost [":" port]
-forward = %s"PFWD" SP dhPublic SP encryptedBlock
-r_key = %s"PKEY" SP dhPublic
-r_response = %s"RRES" SP encryptedBlock
-dhPublic = length x509encoded
-```
+Another possible design is to allow mixing sent messages and normal SMP commands in the same transport connection, but it can make fitting in the block a bit harder, additional overhead would be: 1 (transmission count) + 2 (transmission size) + 1 (empty signature) = 4 bytes.

 The above assumes that the client can only send one message to an SMP relay and then has to wait for response before sending the next message. Missing the response would cause re-delivery (further improvement is possible when proxy detects these redelieveries and not send them to relays but simply reply with the same response).

-### Implementation considerations for the client
-
-While client/server protocol is rather straightforward to implement, and it is already working, there are some decisions to make about how the client makes decisions about.
-
-1. When to use proxy and when to connect directly to the destination relay.
-
-While from the perspective of threat model improvement it may be beneficial to always use the proxy, choosing the proxy that is different from other relays in the connection, initially we need to make it opt-in, with an option to only use it for unknown destination relays, to minimize any unexpected adverse effect on the delivery latency.
-
-Proxy mode will be passed from the client via NetworkConfig.
-
-2. Which proxying relays to use.
-
-Ability to request access to the session with the destination relay (and to create such session) is protected with the same basic auth approach as creating queues - the logic here is that opening private servers to all users as proxies would increase the scenarios for DoS attacks (which is the case with the public servers).
-
-The open question is whether the client should choose proxies from:
- all configured relays.
- there should be a subset of configured relays.
- there should be a separate list.
-
-E.g., there could be a second toggle in the relay configuration to allow using relay as proxy, in addition to the current toggle that allows creating queues.
-
-For simplicity, initially we will just use all enabled relays as potential proxies.
-
-3. How many proxying relays should be used during one session.
-
-This is not a simple question, and it creates a contradiction between two risks:
- collusion between proxies and destination relays simplifies correlating sending clients by session - from the point of view of this risk, clients should follow the same policy for creating connections with proxies, that is to create a new connection for each user profile, and if transport isolation is set to "per connection" - for each destination queue.
- traffic correlation by observable traffic sessions (particularly if an attacker can observe user's ISP traffic or multiple proxies) - from this point of view, it would be beneficial to use fewer proxies and fewer connections with proxies and see the risk of proxy colluding with the destination relay as lower than the risk of traffic observation that in the case of multiple sessions would allow to correlate traffic to rarely used destination relays (any private self-hosted relays) and the traffic of the user to a given proxy, to prove the fact of user communicating with the destination relay via the proxy.
-
-While we can transfer this choice on the users, it seems a complex decision to make, and overall the second risk (traffic correlation) seems more important to address than the first.
-
-In any case possible options are:
-1. Extreme option 1: Create a new proxy session, with the new random proxy, for each potential transport session that would exist if the user were to be connected to destination relays directly. That is, never to mix access to multiple relays from multiple user profiles (and in case of per-connection isolation, to multiple queues) into a one client session with proxy. This is a rather radical option that nullifies any advantages of having fewer sessions with proxies than there would have been with the destination relays and removes any benefits of batching destination server session requests (PRXY comands).
-2. Extreme option 2: Use only one proxy session at the time, mixing traffic from all user profiles and to all destination servers (and for all queues) into a session with one proxy. This minimizes the risks of traffic correlation in case of non-colluding proxy, but maximises the risk in case it colludes with the destination relays.
-3. Balanced option: Use one proxy session per user profile, but mix traffic to multiple queues irrespective of connection isolation option and to all destination servers. Given that connection isolation is an experimental option, this makes the most sense, but it would have to be disclosed.
-4. Less balanced option: take connection isolation option into account and create a new proxy connection for each destination queue. This feels worse than option 3.
-
-If option 3 is chosen, then the transport session key with the proxy would be different from the transport session key with the relay - proxy session will only use UserId as the key, and the relay session uses (UserId, Server, Maybe EntityId) as the key.
-
-If option 4 is chosen, the keys would also be different, as the proxy would then use (UserId, Maybe (Server, EntityId)) as the key.
-
-We could potentially key proxy sessions (and create proxy connections) per each destination relay, in the same way as we key relays themselves, but it seems to have the least sense, as we neither achieve isolation by queue in case proxy and destination relay collude, nor we sufficiently protect from traffic correlation by any observers.
-
-The implemented design is this:
- for each destination relay a random proxy is chosen and used to send all messages - all requests from a client coalesce to a single session.
- transport isolation mode is taken into account, that is if per-connection isolation is enabled, then a separate proxy connection will be created for each messaging queue.
- supported modes when proxy is used: always, for unknown relays, for unknown relays when IP address is not protected, never.
-
-This decision is made because the argument for protection against collusion between proxy and relay and more balanced traffic distribution is stronger than the argument for protection against traffic correlation, because even mixing all messages to one proxy connection does not provide protection against traffic correlation by time, so in any case it requires adding delays.
-
 ### Threat model for SMP proxy and changes to threat model for SMP

 #### SMP proxy
@@ -52,8 +52,8 @@ source_code: https://github.com/simplex-chat/simplexmq

 # We should split this document to the model one, where specific parameters will be external to the document,
 # and specific to us, so that relay operators can adopt our recommended policy and publish any amendments separately.
-usage_conditions: https://github.com/simplex-chat/simplex-chat/blob/_archived-ep/ios-file-provider/PRIVACY.md
-# condition_amendments: link
+conditions: https://github.com/simplex-chat/simplex-chat/blob/_archived-ep/ios-file-provider/PRIVACY.md
+# conditions_amendments: link

 server_country: SE
 operator: SimpleX Chat Ltd.
@@ -62,9 +62,9 @@ website: https://simplex.chat
 admin_simplex: administrative SimpleX address
 admin_email: chat@simplex.chat
 admin_pgp: PGP key
-complaints_simplex: SimpleX address for feedback, comments and complaints
-complaints_email: complaints@simplex.chat
-complaints_pgp: PGP key
+feedback_simplex: SimpleX address for feedback, comments and complaints
+feedback_email: complaints@simplex.chat
+feedback_pgp: PGP key
 hosting: Linode / Akamai Inc.
 hosting_country: US
 ```
@@ -89,27 +89,20 @@ data ServerHandshake = ServerHandshake
  }

 data ServerInformation = ServerInformation
-  { config :: ServerPublicConfig,
-    info :: ServerPublicInfo
-  }
-
-- based on server configuration
-data ServerPublicConfig = ServerPublicConfig
-  { persistence :: SMPServerPersistenceMode,
+  { -- below is based on the existing server configuration
+    persistence :: SMPServerPersistenceMode,
    messageExpiration :: Int,
    statsEnabled :: Bool,
    newQueuesAllowed :: Bool,
-    basicAuthEnabled :: Bool -- server is private if enabled
-  }
-
-- based on INFORMATION section of INI file
-data ServerPublicInfo = ServerPublicInfo
-  { sourceCode :: Text, -- note that this property is not optional, in line with AGPLv3 license
+    basicAuthEnabled :: Bool, -- server is private if enabled
+    -- below is based on INFORMATION section of INI file
+    sourceCode :: Text, -- note that this property is not optional, in line with AGPLv3 license
+    -- all below properties are optional, except entity name MUST be present if any entity country is present
    conditions :: Maybe ServerConditions,
    operator :: Maybe Entity,
    website :: Maybe Text,
-    adminContacts :: Maybe ServerContactAddress,
-    complaintsContacts :: Maybe ServerContactAddress,
+    admin :: Maybe ServerContactAddress,
+    feedback :: Maybe ServerContactAddress,
    hosting :: Maybe Entity,
    serverCountry :: Maybe Text
  }
@@ -1,19 +0,0 @@
-# Evolving agent API
-
-## Problem
-
-Historically, agent API started as a TCP protocol with encoding. We do not use the actual protocol and maintaining the encoding complicates the evolution of the API.
-
-Currently, I was trying to add ERRS event to combine multiple subscription errors into one to prevent overloading the UI with processing multiple subscription errors (e.g.):
-
-```haskell
-ERRS :: (ConnId, AgentErrorType) -> ACommand Agent AEConn
-```
-
-This constructor is not possible to encode/parse in a sensible way other than including lengths of errors.
-
-## Proposal
-
-Remove commands type and encodings for commands and events.
-
-Only keep encodings for the commands that are saved to the database: NEW, JOIN, LET, ACK, SWCH, DEL (this one is no longer used but needs to be supported for backwards compatibility).
@@ -5,7 +5,7 @@ cabal-version: 1.12
 -- see: https://github.com/sol/hpack

 name:           simplexmq
-version:        5.8.0.10
+version:        5.7.4.0
 synopsis:       SimpleXMQ message broker
 description:    This package includes <./docs/Simplex-Messaging-Server.html server>,
                <./docs/Simplex-Messaging-Client.html client> and
@@ -28,33 +28,6 @@ extra-source-files:
    CHANGELOG.md
    cbits/sha512.h
    cbits/sntrup761.h
-    apps/smp-server/static/index.html
-    apps/smp-server/static/link.html
-    apps/smp-server/static/media/apk_icon.png
-    apps/smp-server/static/media/apple_store.svg
-    apps/smp-server/static/media/contact.js
-    apps/smp-server/static/media/contact_page_mobile.png
-    apps/smp-server/static/media/f_droid.svg
-    apps/smp-server/static/media/favicon.ico
-    apps/smp-server/static/media/GilroyBold.woff2
-    apps/smp-server/static/media/GilroyLight.woff2
-    apps/smp-server/static/media/GilroyMedium.woff2
-    apps/smp-server/static/media/GilroyRegular.woff2
-    apps/smp-server/static/media/GilroyRegularItalic.woff2
-    apps/smp-server/static/media/google_play.svg
-    apps/smp-server/static/media/logo-dark.png
-    apps/smp-server/static/media/logo-light.png
-    apps/smp-server/static/media/logo-symbol-dark.svg
-    apps/smp-server/static/media/logo-symbol-light.svg
-    apps/smp-server/static/media/moon.svg
-    apps/smp-server/static/media/qrcode.js
-    apps/smp-server/static/media/script.js
-    apps/smp-server/static/media/style.css
-    apps/smp-server/static/media/sun.svg
-    apps/smp-server/static/media/swiper-bundle.min.css
-    apps/smp-server/static/media/swiper-bundle.min.js
-    apps/smp-server/static/media/tailwind.css
-    apps/smp-server/static/media/testflight.png

 flag swift
  description: Enable swift JSON format
@@ -95,6 +68,7 @@ library
      Simplex.Messaging.Agent.Protocol
      Simplex.Messaging.Agent.QueryString
      Simplex.Messaging.Agent.RetryInterval
+      Simplex.Messaging.Agent.Server
      Simplex.Messaging.Agent.Store
      Simplex.Messaging.Agent.Store.SQLite
      Simplex.Messaging.Agent.Store.SQLite.Common
@@ -131,7 +105,6 @@ library
      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240124_file_redirect
      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240223_connections_wait_delivery
      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240225_ratchet_kem
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240417_rcv_files_approved_relays
      Simplex.Messaging.Agent.TRcvQueues
      Simplex.Messaging.Client
      Simplex.Messaging.Client.Agent
@@ -166,16 +139,12 @@ library
      Simplex.Messaging.Server.Control
      Simplex.Messaging.Server.Env.STM
      Simplex.Messaging.Server.Expiration
-      Simplex.Messaging.Server.Information
      Simplex.Messaging.Server.Main
      Simplex.Messaging.Server.MsgStore
      Simplex.Messaging.Server.MsgStore.STM
      Simplex.Messaging.Server.QueueStore
-      Simplex.Messaging.Server.QueueStore.QueueInfo
      Simplex.Messaging.Server.QueueStore.STM
      Simplex.Messaging.Server.Stats
-      Simplex.Messaging.Server.Stats.Client
-      Simplex.Messaging.Server.Stats.Timeline
      Simplex.Messaging.Server.StoreLog
      Simplex.Messaging.ServiceScheme
      Simplex.Messaging.Session
@@ -205,7 +174,7 @@ library
      src
  default-extensions:
      StrictData
-  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-unused-packages -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2
+  ghc-options: -Wall -Wcompat -Werror=incomplete-patterns -Wredundant-constraints -Wincomplete-record-updates -Wincomplete-uni-patterns -Wunused-type-patterns -O2
  include-dirs:
      cbits
  c-sources:
@@ -235,7 +204,6 @@ library
    , direct-sqlcipher ==2.3.*
    , directory ==1.3.*
    , filepath ==1.4.*
-    , hashable ==1.4.*
    , hourglass ==0.2.*
    , http-types ==0.12.*
    , http2 >=4.2.2 && <4.3
@@ -250,7 +218,6 @@ library
    , network-udp ==0.0.*
    , optparse-applicative >=0.15 && <0.17
    , process ==1.6.*
-    , psqueues ==0.2.8.*
    , random >=1.1 && <1.3
    , simple-logger ==0.1.*
    , socks ==0.6.*
@@ -263,6 +230,7 @@ library
    , transformers ==0.6.*
    , unliftio ==0.2.*
    , unliftio-core ==0.2.*
+    , unordered-containers
    , websockets ==0.12.*
    , yaml ==0.11.*
    , zstd ==0.1.3.*
@@ -288,7 +256,7 @@ executable ntf-server
      apps/ntf-server
  default-extensions:
      StrictData
-  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-unused-packages -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2 -threaded -rtsopts
+  ghc-options: -Wall -Wcompat -Werror=incomplete-patterns -Wredundant-constraints -Wincomplete-record-updates -Wincomplete-uni-patterns -Wunused-type-patterns -O2 -threaded -rtsopts
  build-depends:
      aeson ==2.2.*
    , ansi-terminal >=0.10 && <0.12
@@ -311,7 +279,6 @@ executable ntf-server
    , direct-sqlcipher ==2.3.*
    , directory ==1.3.*
    , filepath ==1.4.*
-    , hashable ==1.4.*
    , hourglass ==0.2.*
    , http-types ==0.12.*
    , http2 >=4.2.2 && <4.3
@@ -326,7 +293,6 @@ executable ntf-server
    , network-udp ==0.0.*
    , optparse-applicative >=0.15 && <0.17
    , process ==1.6.*
-    , psqueues ==0.2.8.*
    , random >=1.1 && <1.3
    , simple-logger ==0.1.*
    , simplexmq
@@ -340,6 +306,83 @@ executable ntf-server
    , transformers ==0.6.*
    , unliftio ==0.2.*
    , unliftio-core ==0.2.*
+    , unordered-containers
+    , websockets ==0.12.*
+    , yaml ==0.11.*
+    , zstd ==0.1.3.*
+  default-language: Haskell2010
+  if flag(swift)
+    cpp-options: -DswiftJSON
+  if impl(ghc >= 9.6.2)
+    build-depends:
+        bytestring ==0.11.*
+      , template-haskell ==2.20.*
+      , text >=2.0.1 && <2.2
+  if impl(ghc < 9.6.2)
+    build-depends:
+        bytestring ==0.10.*
+      , template-haskell ==2.16.*
+      , text >=1.2.3.0 && <1.3
+
+executable smp-agent
+  main-is: Main.hs
+  other-modules:
+      Paths_simplexmq
+  hs-source-dirs:
+      apps/smp-agent
+  default-extensions:
+      StrictData
+  ghc-options: -Wall -Wcompat -Werror=incomplete-patterns -Wredundant-constraints -Wincomplete-record-updates -Wincomplete-uni-patterns -Wunused-type-patterns -O2 -threaded -rtsopts
+  build-depends:
+      aeson ==2.2.*
+    , ansi-terminal >=0.10 && <0.12
+    , asn1-encoding ==0.9.*
+    , asn1-types ==0.3.*
+    , async ==2.2.*
+    , attoparsec ==0.14.*
+    , base >=4.14 && <5
+    , base64-bytestring >=1.0 && <1.3
+    , case-insensitive ==1.2.*
+    , composition ==1.0.*
+    , constraints >=0.12 && <0.14
+    , containers ==0.6.*
+    , crypton ==0.34.*
+    , crypton-x509 ==1.7.*
+    , crypton-x509-store ==1.6.*
+    , crypton-x509-validation ==1.6.*
+    , cryptostore ==0.3.*
+    , data-default ==0.7.*
+    , direct-sqlcipher ==2.3.*
+    , directory ==1.3.*
+    , filepath ==1.4.*
+    , hourglass ==0.2.*
+    , http-types ==0.12.*
+    , http2 >=4.2.2 && <4.3
+    , ini ==0.4.1
+    , iproute ==1.7.*
+    , iso8601-time ==0.1.*
+    , memory ==0.18.*
+    , mtl >=2.3.1 && <3.0
+    , network >=3.1.2.7 && <3.2
+    , network-info ==0.2.*
+    , network-transport ==0.5.6
+    , network-udp ==0.0.*
+    , optparse-applicative >=0.15 && <0.17
+    , process ==1.6.*
+    , random >=1.1 && <1.3
+    , simple-logger ==0.1.*
+    , simplexmq
+    , socks ==0.6.*
+    , sqlcipher-simple ==0.4.*
+    , stm ==2.5.*
+    , temporary ==1.3.*
+    , time ==1.12.*
+    , time-manager ==0.0.*
+    , tls >=1.7.0 && <1.8
+    , transformers ==0.6.*
+    , unliftio ==0.2.*
+    , unliftio-core ==0.2.*
+    , unordered-containers
    , websockets ==0.12.*
    , yaml ==0.11.*
    , zstd ==0.1.3.*
@@ -360,15 +403,12 @@ executable ntf-server
 executable smp-server
  main-is: Main.hs
  other-modules:
-      Static
-      Static.Embedded
      Paths_simplexmq
  hs-source-dirs:
      apps/smp-server
-      apps/smp-server/web
  default-extensions:
      StrictData
-  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-unused-packages -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2 -threaded -rtsopts
+  ghc-options: -Wall -Wcompat -Werror=incomplete-patterns -Wredundant-constraints -Wincomplete-record-updates -Wincomplete-uni-patterns -Wunused-type-patterns -O2 -threaded -rtsopts
  build-depends:
      aeson ==2.2.*
    , ansi-terminal >=0.10 && <0.12
@@ -390,9 +430,7 @@ executable smp-server
    , data-default ==0.7.*
    , direct-sqlcipher ==2.3.*
    , directory ==1.3.*
-    , file-embed
    , filepath ==1.4.*
-    , hashable ==1.4.*
    , hourglass ==0.2.*
    , http-types ==0.12.*
    , http2 >=4.2.2 && <4.3
@@ -407,7 +445,6 @@ executable smp-server
    , network-udp ==0.0.*
    , optparse-applicative >=0.15 && <0.17
    , process ==1.6.*
-    , psqueues ==0.2.8.*
    , random >=1.1 && <1.3
    , simple-logger ==0.1.*
    , simplexmq
@@ -421,9 +458,7 @@ executable smp-server
    , transformers ==0.6.*
    , unliftio ==0.2.*
    , unliftio-core ==0.2.*
-    , wai-app-static
-    , warp
-    , warp-tls
+    , unordered-containers
    , websockets ==0.12.*
    , yaml ==0.11.*
    , zstd ==0.1.3.*
@@ -449,7 +484,7 @@ executable xftp
      apps/xftp
  default-extensions:
      StrictData
-  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-unused-packages -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2 -threaded -rtsopts
+  ghc-options: -Wall -Wcompat -Werror=incomplete-patterns -Wredundant-constraints -Wincomplete-record-updates -Wincomplete-uni-patterns -Wunused-type-patterns -O2 -threaded -rtsopts
  build-depends:
      aeson ==2.2.*
    , ansi-terminal >=0.10 && <0.12
@@ -472,7 +507,6 @@ executable xftp
    , direct-sqlcipher ==2.3.*
    , directory ==1.3.*
    , filepath ==1.4.*
-    , hashable ==1.4.*
    , hourglass ==0.2.*
    , http-types ==0.12.*
    , http2 >=4.2.2 && <4.3
@@ -487,7 +521,6 @@ executable xftp
    , network-udp ==0.0.*
    , optparse-applicative >=0.15 && <0.17
    , process ==1.6.*
-    , psqueues ==0.2.8.*
    , random >=1.1 && <1.3
    , simple-logger ==0.1.*
    , simplexmq
@@ -501,6 +534,7 @@ executable xftp
    , transformers ==0.6.*
    , unliftio ==0.2.*
    , unliftio-core ==0.2.*
+    , unordered-containers
    , websockets ==0.12.*
    , yaml ==0.11.*
    , zstd ==0.1.3.*
@@ -526,7 +560,7 @@ executable xftp-server
      apps/xftp-server
  default-extensions:
      StrictData
-  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-unused-packages -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2 -threaded -rtsopts
+  ghc-options: -Wall -Wcompat -Werror=incomplete-patterns -Wredundant-constraints -Wincomplete-record-updates -Wincomplete-uni-patterns -Wunused-type-patterns -O2 -threaded -rtsopts
  build-depends:
      aeson ==2.2.*
    , ansi-terminal >=0.10 && <0.12
@@ -549,7 +583,6 @@ executable xftp-server
    , direct-sqlcipher ==2.3.*
    , directory ==1.3.*
    , filepath ==1.4.*
-    , hashable ==1.4.*
    , hourglass ==0.2.*
    , http-types ==0.12.*
    , http2 >=4.2.2 && <4.3
@@ -564,7 +597,6 @@ executable xftp-server
    , network-udp ==0.0.*
    , optparse-applicative >=0.15 && <0.17
    , process ==1.6.*
-    , psqueues ==0.2.8.*
    , random >=1.1 && <1.3
    , simple-logger ==0.1.*
    , simplexmq
@@ -578,6 +610,7 @@ executable xftp-server
    , transformers ==0.6.*
    , unliftio ==0.2.*
    , unliftio-core ==0.2.*
+    , unordered-containers
    , websockets ==0.12.*
    , yaml ==0.11.*
    , zstd ==0.1.3.*
@@ -613,6 +646,7 @@ test-suite simplexmq-test
      CoreTests.CryptoFileTests
      CoreTests.CryptoTests
      CoreTests.EncodingTests
+      CoreTests.ProtocolErrorTests
      CoreTests.RetryIntervalTests
      CoreTests.TRcvQueuesTests
      CoreTests.UtilTests
@@ -624,7 +658,6 @@ test-suite simplexmq-test
      ServerTests
      SMPAgentClient
      SMPClient
-      SMPProxyTests
      Util
      XFTPAgent
      XFTPCLI
@@ -635,7 +668,7 @@ test-suite simplexmq-test
      tests
  default-extensions:
      StrictData
-  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-unused-packages -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2 -threaded -rtsopts -with-rtsopts=-A64M -with-rtsopts=-N1
+  ghc-options: -Wall -Wcompat -Werror=incomplete-patterns -Wredundant-constraints -Wincomplete-record-updates -Wincomplete-uni-patterns -Wunused-type-patterns -O2 -threaded -rtsopts -with-rtsopts=-A64M -with-rtsopts=-N1
  build-depends:
      HUnit ==1.6.*
    , QuickCheck ==2.14.*
@@ -662,7 +695,6 @@ test-suite simplexmq-test
    , directory ==1.3.*
    , filepath ==1.4.*
    , generic-random ==1.5.*
-    , hashable ==1.4.*
    , hourglass ==0.2.*
    , hspec ==2.11.*
    , hspec-core ==2.11.*
@@ -680,7 +712,6 @@ test-suite simplexmq-test
    , network-udp ==0.0.*
    , optparse-applicative >=0.15 && <0.17
    , process ==1.6.*
-    , psqueues ==0.2.8.*
    , random >=1.1 && <1.3
    , silently ==1.2.*
    , simple-logger ==0.1.*
@@ -696,6 +727,7 @@ test-suite simplexmq-test
    , transformers ==0.6.*
    , unliftio ==0.2.*
    , unliftio-core ==0.2.*
+    , unordered-containers
    , websockets ==0.12.*
    , yaml ==0.11.*
    , zstd ==0.1.3.*
@@ -32,13 +32,12 @@ import Control.Logger.Simple (logError)
 import Control.Monad
 import Control.Monad.Except
 import Control.Monad.Reader
-import Control.Monad.Trans.Except
 import Data.Bifunctor (first)
 import qualified Data.ByteString.Char8 as B
 import qualified Data.ByteString.Lazy.Char8 as LB
 import Data.Coerce (coerce)
 import Data.Composition ((.:))
-import Data.Either (partitionEithers, rights)
+import Data.Either (rights)
 import Data.Int (Int64)
 import Data.List (foldl', partition, sortOn)
 import qualified Data.List.NonEmpty as L
@@ -57,7 +56,6 @@ import Simplex.FileTransfer.Protocol (FileParty (..), SFileParty (..))
 import Simplex.FileTransfer.Transport (XFTPRcvChunkSpec (..))
 import qualified Simplex.FileTransfer.Transport as XFTP
 import Simplex.FileTransfer.Types
-import qualified Simplex.FileTransfer.Types as FT
 import Simplex.FileTransfer.Util (removePath, uniqueCombine)
 import Simplex.Messaging.Agent.Client
 import Simplex.Messaging.Agent.Env.SQLite
@@ -71,8 +69,7 @@ import qualified Simplex.Messaging.Crypto.File as CF
 import qualified Simplex.Messaging.Crypto.Lazy as LC
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String (strDecode, strEncode)
-import Simplex.Messaging.Protocol (EntityId, ProtocolServer, ProtocolType (..), XFTPServer)
-import qualified Simplex.Messaging.TMap as TM
+import Simplex.Messaging.Protocol (EntityId, XFTPServer)
 import Simplex.Messaging.Util (catchAll_, liftError, tshow, unlessM, whenM)
 import System.FilePath (takeFileName, (</>))
 import UnliftIO
@@ -115,8 +112,8 @@ closeXFTPAgent a = do
  where
    stopWorkers workers = atomically (swapTVar workers M.empty) >>= mapM_ (liftIO . cancelWorker)

-xftpReceiveFile' :: AgentClient -> UserId -> ValidFileDescription 'FRecipient -> Maybe CryptoFileArgs -> Bool -> AM RcvFileId
-xftpReceiveFile' c userId (ValidFileDescription fd@FileDescription {chunks, redirect}) cfArgs approvedRelays = do
+xftpReceiveFile' :: AgentClient -> UserId -> ValidFileDescription 'FRecipient -> Maybe CryptoFileArgs -> AM RcvFileId
+xftpReceiveFile' c userId (ValidFileDescription fd@FileDescription {chunks, redirect}) cfArgs = do
  g <- asks random
  prefixPath <- lift $ getPrefixPath "rcv.xftp"
  createDirectory prefixPath
@@ -127,7 +124,7 @@ xftpReceiveFile' c userId (ValidFileDescription fd@FileDescription {chunks, redi
  lift $ createEmptyFile =<< toFSFilePath relSavePath
  let saveFile = CryptoFile relSavePath cfArgs
  fId <- case redirect of
-    Nothing -> withStore c $ \db -> createRcvFile db g userId fd relPrefixPath relTmpPath saveFile approvedRelays
+    Nothing -> withStore c $ \db -> createRcvFile db g userId fd relPrefixPath relTmpPath saveFile
    Just _ -> do
      -- prepare description paths
      let relTmpPathRedirect = relPrefixPath </> "xftp.redirect-encrypted"
@@ -137,14 +134,14 @@ xftpReceiveFile' c userId (ValidFileDescription fd@FileDescription {chunks, redi
      cfArgsRedirect <- atomically $ CF.randomArgs g
      let saveFileRedirect = CryptoFile relSavePathRedirect $ Just cfArgsRedirect
      -- create download tasks
-      withStore c $ \db -> createRcvFileRedirect db g userId fd relPrefixPath relTmpPathRedirect saveFileRedirect relTmpPath saveFile approvedRelays
+      withStore c $ \db -> createRcvFileRedirect db g userId fd relPrefixPath relTmpPathRedirect saveFileRedirect relTmpPath saveFile
  forM_ chunks (downloadChunk c)
  pure fId

 downloadChunk :: AgentClient -> FileChunk -> AM ()
 downloadChunk c FileChunk {replicas = (FileChunkReplica {server} : _)} = do
  lift . void $ getXFTPRcvWorker True c (Just server)
-downloadChunk _ _ = throwE $ INTERNAL "no replicas"
+downloadChunk _ _ = throwError $ INTERNAL "no replicas"

 getPrefixPath :: String -> AM' FilePath
 getPrefixPath suffix = do
@@ -177,27 +174,26 @@ runXFTPRcvWorker c srv Worker {doWork} = do
    runXFTPOperation cfg
  where
    runXFTPOperation :: AgentConfig -> AM ()
-    runXFTPOperation AgentConfig {rcvFilesTTL, reconnectInterval = ri, xftpConsecutiveRetries} =
+    runXFTPOperation AgentConfig {rcvFilesTTL, reconnectInterval = ri, xftpNotifyErrsOnRetry = notifyOnRetry, xftpConsecutiveRetries} =
      withWork c doWork (\db -> getNextRcvChunkToDownload db srv rcvFilesTTL) $ \case
-        (RcvFileChunk {rcvFileId, rcvFileEntityId, fileTmpPath, replicas = []}, _) -> rcvWorkerInternalError c rcvFileId rcvFileEntityId (Just fileTmpPath) (INTERNAL "chunk has no replicas")
-        (fc@RcvFileChunk {userId, rcvFileId, rcvFileEntityId, digest, fileTmpPath, replicas = replica@RcvFileChunkReplica {rcvChunkReplicaId, server, delay} : _}, approvedRelays) -> do
+        RcvFileChunk {rcvFileId, rcvFileEntityId, fileTmpPath, replicas = []} -> rcvWorkerInternalError c rcvFileId rcvFileEntityId (Just fileTmpPath) "chunk has no replicas"
+        fc@RcvFileChunk {userId, rcvFileId, rcvFileEntityId, digest, fileTmpPath, replicas = replica@RcvFileChunkReplica {rcvChunkReplicaId, server, delay} : _} -> do
          let ri' = maybe ri (\d -> ri {initialInterval = d, increaseAfter = 0}) delay
          withRetryIntervalLimit xftpConsecutiveRetries ri' $ \delay' loop -> do
-            liftIO $ waitForUserNetwork c
-            downloadFileChunk fc replica approvedRelays
+            lift $ waitForUserNetwork c
+            downloadFileChunk fc replica
              `catchAgentError` \e -> retryOnError "XFTP rcv worker" (retryLoop loop e delay') (retryDone e) e
          where
            retryLoop loop e replicaDelay = do
              flip catchAgentError (\_ -> pure ()) $ do
-                when (serverHostError e) $ notify c rcvFileEntityId $ RFWARN e
+                when notifyOnRetry $ notify c rcvFileEntityId $ RFERR e
                liftIO $ closeXFTPServerClient c userId server digest
                withStore' c $ \db -> updateRcvChunkReplicaDelay db rcvChunkReplicaId replicaDelay
              atomically $ assertAgentForeground c
              loop
-            retryDone = rcvWorkerInternalError c rcvFileId rcvFileEntityId (Just fileTmpPath)
-    downloadFileChunk :: RcvFileChunk -> RcvFileChunkReplica -> Bool -> AM ()
-    downloadFileChunk RcvFileChunk {userId, rcvFileId, rcvFileEntityId, rcvChunkId, chunkNo, chunkSize, digest, fileTmpPath} replica approvedRelays = do
-      unlessM ((approvedRelays ||) <$> ipAddressProtected') $ throwE $ FILE NOT_APPROVED
+            retryDone e = rcvWorkerInternalError c rcvFileId rcvFileEntityId (Just fileTmpPath) (show e)
+    downloadFileChunk :: RcvFileChunk -> RcvFileChunkReplica -> AM ()
+    downloadFileChunk RcvFileChunk {userId, rcvFileId, rcvFileEntityId, rcvChunkId, chunkNo, chunkSize, digest, fileTmpPath} replica = do
      fsFileTmpPath <- lift $ toFSFilePath fileTmpPath
      chunkPath <- uniqueCombine fsFileTmpPath $ show chunkNo
      let chunkSpec = XFTPRcvChunkSpec chunkPath (unFileSize chunkSize) (unFileDigest digest)
@@ -218,10 +214,6 @@ runXFTPRcvWorker c srv Worker {doWork} = do
      when complete . lift . void $
        getXFTPRcvWorker True c Nothing
      where
-        ipAddressProtected' :: AM Bool
-        ipAddressProtected' = do
-          cfg <- liftIO $ getNetworkConfig' c
-          pure $ ipAddressProtected cfg srv
        receivedSize :: [RcvFileChunk] -> Int64
        receivedSize = foldl' (\sz ch -> sz + receivedChunkSize ch) 0
        receivedChunkSize ch@RcvFileChunk {chunkSize = s}
@@ -238,15 +230,15 @@ withRetryIntervalLimit maxN ri action =
 retryOnError :: Text -> AM a -> AM a -> AgentErrorType -> AM a
 retryOnError name loop done e = do
  logError $ name <> " error: " <> tshow e
-  if temporaryOrHostError e
+  if temporaryAgentError e
    then loop
    else done

-rcvWorkerInternalError :: AgentClient -> DBRcvFileId -> RcvFileId -> Maybe FilePath -> AgentErrorType -> AM ()
-rcvWorkerInternalError c rcvFileId rcvFileEntityId tmpPath err = do
+rcvWorkerInternalError :: AgentClient -> DBRcvFileId -> RcvFileId -> Maybe FilePath -> String -> AM ()
+rcvWorkerInternalError c rcvFileId rcvFileEntityId tmpPath internalErrStr = do
  lift $ forM_ tmpPath (removePath <=< toFSFilePath)
-  withStore' c $ \db -> updateRcvFileError db rcvFileId (show err)
-  notify c rcvFileEntityId $ RFERR err
+  withStore' c $ \db -> updateRcvFileError db rcvFileId internalErrStr
+  notify c rcvFileEntityId $ RFERR $ INTERNAL internalErrStr

 runXFTPRcvLocalWorker :: AgentClient -> Worker -> AM ()
 runXFTPRcvLocalWorker c Worker {doWork} = do
@@ -260,7 +252,7 @@ runXFTPRcvLocalWorker c Worker {doWork} = do
    runXFTPOperation AgentConfig {rcvFilesTTL} =
      withWork c doWork (`getNextRcvFileToDecrypt` rcvFilesTTL) $
        \f@RcvFile {rcvFileId, rcvFileEntityId, tmpPath} ->
-          decryptFile f `catchAgentError` rcvWorkerInternalError c rcvFileId rcvFileEntityId tmpPath
+          decryptFile f `catchAgentError` (rcvWorkerInternalError c rcvFileId rcvFileEntityId tmpPath . show)
    decryptFile :: RcvFile -> AM ()
    decryptFile RcvFile {rcvFileId, rcvFileEntityId, size, digest, key, nonce, tmpPath, saveFile, status, chunks, redirect} = do
      let CryptoFile savePath cfArgs = saveFile
@@ -270,11 +262,11 @@ runXFTPRcvLocalWorker c Worker {doWork} = do
      withStore' c $ \db -> updateRcvFileStatus db rcvFileId RFSDecrypting
      chunkPaths <- getChunkPaths chunks
      encSize <- liftIO $ foldM (\s path -> (s +) . fromIntegral <$> getFileSize path) 0 chunkPaths
-      when (FileSize encSize /= size) $ throwE $ XFTP "" XFTP.SIZE
+      when (FileSize encSize /= size) $ throwError $ XFTP XFTP.SIZE
      encDigest <- liftIO $ LC.sha512Hash <$> readChunks chunkPaths
-      when (FileDigest encDigest /= digest) $ throwE $ XFTP "" XFTP.DIGEST
+      when (FileDigest encDigest /= digest) $ throwError $ XFTP XFTP.DIGEST
      let destFile = CryptoFile fsSavePath cfArgs
-      void $ liftError (FILE . FILE_IO . show) $ decryptChunks encSize chunkPaths key nonce $ \_ -> pure destFile
+      void $ liftError (INTERNAL . show) $ decryptChunks encSize chunkPaths key nonce $ \_ -> pure destFile
      case redirect of
        Nothing -> do
          notify c rcvFileEntityId $ RFDONE fsSavePath
@@ -287,13 +279,12 @@ runXFTPRcvLocalWorker c Worker {doWork} = do
          atomically $ waitUntilForeground c
          withStore' c (`updateRcvFileComplete` rcvFileId)
          -- proceed with redirect
-          yaml <- liftError (FILE . FILE_IO . show) (CF.readFile $ CryptoFile fsSavePath cfArgs) `agentFinally` (lift $ toFSFilePath fsSavePath >>= removePath)
+          yaml <- liftError (INTERNAL . show) (CF.readFile $ CryptoFile fsSavePath cfArgs) `agentFinally` (lift $ toFSFilePath fsSavePath >>= removePath)
          next@FileDescription {chunks = nextChunks} <- case strDecode (LB.toStrict yaml) of
-            -- TODO switch to another error constructor
-            Left _ -> throwE . FILE $ REDIRECT "decode error"
+            Left _ -> throwError . XFTP $ XFTP.REDIRECT "decode error"
            Right (ValidFileDescription fd@FileDescription {size = dstSize, digest = dstDigest})
-              | dstSize /= redirectSize -> throwE . FILE $ REDIRECT "size mismatch"
-              | dstDigest /= redirectDigest -> throwE . FILE $ REDIRECT "digest mismatch"
+              | dstSize /= redirectSize -> throwError . XFTP $ XFTP.REDIRECT "size mismatch"
+              | dstDigest /= redirectDigest -> throwError . XFTP $ XFTP.REDIRECT "digest mismatch"
              | otherwise -> pure fd
          -- register and download chunks from the actual file
          withStore c $ \db -> updateRcvFileRedirect db redirectDbId next
@@ -306,7 +297,7 @@ runXFTPRcvLocalWorker c Worker {doWork} = do
          fsPath <- lift $ toFSFilePath path
          pure $ fsPath : ps
        getChunkPaths (RcvFileChunk {chunkTmpPath = Nothing} : _cs) =
-          throwE $ INTERNAL "no chunk path"
+          throwError $ INTERNAL "no chunk path"

 xftpDeleteRcvFile' :: AgentClient -> RcvFileId -> AM' ()
 xftpDeleteRcvFile' c rcvFileEntityId = xftpDeleteRcvFiles' c [rcvFileEntityId]
@@ -326,8 +317,8 @@ xftpDeleteRcvFiles' c rcvFileEntityIds = do
    batchFiles :: (DB.Connection -> DBRcvFileId -> IO a) -> [RcvFile] -> AM' [Either AgentErrorType a]
    batchFiles f rcvFiles = withStoreBatch' c $ \db -> map (\RcvFile {rcvFileId} -> f db rcvFileId) rcvFiles

-notify :: forall m e. (MonadIO m, AEntityI e) => AgentClient -> EntityId -> AEvent e -> m ()
-notify c entId cmd = atomically $ writeTBQueue (subQ c) ("", entId, AEvt (sAEntity @e) cmd)
+notify :: forall m e. (MonadIO m, AEntityI e) => AgentClient -> EntityId -> ACommand 'Agent e -> m ()
+notify c entId cmd = atomically $ writeTBQueue (subQ c) ("", entId, APC (sAEntity @e) cmd)

 xftpSendFile' :: AgentClient -> UserId -> CryptoFile -> Int -> AM SndFileId
 xftpSendFile' c userId file numRecipients = do
@@ -351,7 +342,7 @@ xftpSendDescription' c userId (ValidFileDescription fdDirect@FileDescription {si
  let directYaml = prefixPath </> "direct.yaml"
  cfArgs <- atomically $ CF.randomArgs g
  let file = CryptoFile directYaml (Just cfArgs)
-  liftError (FILE . FILE_IO . show) $ CF.writeFile file (LB.fromStrict $ strEncode fdDirect)
+  liftError (INTERNAL . show) $ CF.writeFile file (LB.fromStrict $ strEncode fdDirect)
  key <- atomically $ C.randomSbKey g
  nonce <- atomically $ C.randomCbNonce g
  fId <- withStore c $ \db -> createSndFile db g userId file numRecipients relPrefixPath key nonce $ Just RedirectFileInfo {size, digest}
@@ -379,11 +370,11 @@ runXFTPSndPrepareWorker c Worker {doWork} = do
    runXFTPOperation cfg@AgentConfig {sndFilesTTL} =
      withWork c doWork (`getNextSndFileToPrepare` sndFilesTTL) $
        \f@SndFile {sndFileId, sndFileEntityId, prefixPath} ->
-          prepareFile cfg f `catchAgentError` sndWorkerInternalError c sndFileId sndFileEntityId prefixPath
+          prepareFile cfg f `catchAgentError` (sndWorkerInternalError c sndFileId sndFileEntityId prefixPath . show)
    prepareFile :: AgentConfig -> SndFile -> AM ()
    prepareFile _ SndFile {prefixPath = Nothing} =
-      throwE $ INTERNAL "no prefix path"
-    prepareFile cfg sndFile@SndFile {sndFileId, sndFileEntityId, userId, prefixPath = Just ppath, status} = do
+      throwError $ INTERNAL "no prefix path"
+    prepareFile cfg sndFile@SndFile {sndFileId, userId, prefixPath = Just ppath, status} = do
      SndFile {numRecipients, chunks} <-
        if status /= SFSEncrypted -- status is SFSNew or SFSEncrypting
          then do
@@ -397,14 +388,9 @@ runXFTPSndPrepareWorker c Worker {doWork} = do
              getSndFile db sndFileId
          else pure sndFile
      let numRecipients' = min numRecipients maxRecipients
-      -- in case chunk preparation previously failed mid-way, some chunks may already be created -
-      -- here we split previously prepared chunks from the pending ones to then build full list of servers
-      let (pendingChunks, preparedSrvs) = partitionEithers $ map srvOrPendingChunk chunks
      -- concurrently?
      -- separate worker to create chunks? record retries and delay on snd_file_chunks?
-      srvs <- forM pendingChunks $ createChunk numRecipients'
-      let allSrvs = S.fromList $ preparedSrvs <> srvs
-      lift $ forM_ allSrvs $ \srv -> getXFTPSndWorker True c (Just srv)
+      forM_ (filter (\SndFileChunk {replicas} -> null replicas) chunks) $ createChunk numRecipients'
      withStore' c $ \db -> updateSndFileStatus db sndFileId SFSUploading
      where
        AgentConfig {xftpMaxRecipientsPerRequest = maxRecipients, messageRetryInterval = ri} = cfg
@@ -413,60 +399,48 @@ runXFTPSndPrepareWorker c Worker {doWork} = do
          let CryptoFile {filePath} = srcFile
              fileName = takeFileName filePath
          fileSize <- liftIO $ fromInteger <$> CF.getFileContentsSize srcFile
-          when (fileSize > maxFileSizeHard) $ throwE $ FILE FT.SIZE
+          when (fileSize > maxFileSizeHard) $ throwError $ INTERNAL "max file size exceeded"
          let fileHdr = smpEncode FileHeader {fileName, fileExtra = Nothing}
              fileSize' = fromIntegral (B.length fileHdr) + fileSize
              payloadSize = fileSize' + fileSizeLen + authTagSize
          chunkSizes <- case redirect of
            Nothing -> pure $ prepareChunkSizes payloadSize
            Just _ -> case singleChunkSize payloadSize of
-              Nothing -> throwE $ FILE FT.SIZE
+              Nothing -> throwError $ INTERNAL "max file size exceeded for redirect"
              Just chunkSize -> pure [chunkSize]
          let encSize = sum $ map fromIntegral chunkSizes
-          void $ liftError (FILE . FILE_IO . show) $ encryptFile srcFile fileHdr key nonce fileSize' encSize fsEncPath
+          void $ liftError (INTERNAL . show) $ encryptFile srcFile fileHdr key nonce fileSize' encSize fsEncPath
          digest <- liftIO $ LC.sha512Hash <$> LB.readFile fsEncPath
          let chunkSpecs = prepareChunkSpecs fsEncPath chunkSizes
          chunkDigests <- liftIO $ mapM getChunkDigest chunkSpecs
          pure (FileDigest digest, zip chunkSpecs $ coerce chunkDigests)
-        srvOrPendingChunk :: SndFileChunk -> Either SndFileChunk (ProtocolServer 'PXFTP)
-        srvOrPendingChunk ch@SndFileChunk {replicas} = case replicas of
-          [] -> Left ch
-          SndFileChunkReplica {server} : _ -> Right server
-        createChunk :: Int -> SndFileChunk -> AM (ProtocolServer 'PXFTP)
+        createChunk :: Int -> SndFileChunk -> AM ()
        createChunk numRecipients' ch = do
          atomically $ assertAgentForeground c
          (replica, ProtoServerWithAuth srv _) <- tryCreate
          withStore' c $ \db -> createSndFileReplica db ch replica
-          pure srv
+          lift . void $ getXFTPSndWorker True c (Just srv)
          where
            tryCreate = do
              usedSrvs <- newTVarIO ([] :: [XFTPServer])
-              let AgentClient {xftpServers} = c
-              userSrvCount <- length <$> atomically (TM.lookup userId xftpServers)
-              withRetryIntervalCount (riFast ri) $ \n _ loop -> do
-                liftIO $ waitForUserNetwork c
-                let triedAllSrvs = n > userSrvCount
+              withRetryInterval (riFast ri) $ \_ loop -> do
+                lift $ waitForUserNetwork c
                createWithNextSrv usedSrvs
-                  `catchAgentError` \e -> retryOnError "XFTP prepare worker" (retryLoop loop triedAllSrvs e) (throwE e) e
+                  `catchAgentError` \e -> retryOnError "XFTP prepare worker" (retryLoop loop) (throwError e) e
              where
-                -- we don't do closeXFTPServerClient here to not risk closing connection for concurrent chunk upload
-                retryLoop loop triedAllSrvs e = do
-                  flip catchAgentError (\_ -> pure ()) $ do
-                    when (triedAllSrvs && serverHostError e) $ notify c sndFileEntityId $ SFWARN e
-                  atomically $ assertAgentForeground c
-                  loop
+                retryLoop loop = atomically (assertAgentForeground c) >> loop
            createWithNextSrv usedSrvs = do
              deleted <- withStore' c $ \db -> getSndFileDeleted db sndFileId
-              when deleted $ throwE $ FILE NO_FILE
+              when deleted $ throwError $ INTERNAL "file deleted, aborting chunk creation"
              withNextSrv c userId usedSrvs [] $ \srvAuth -> do
                replica <- agentXFTPNewChunk c ch numRecipients' srvAuth
                pure (replica, srvAuth)

-sndWorkerInternalError :: AgentClient -> DBSndFileId -> SndFileId -> Maybe FilePath -> AgentErrorType -> AM ()
-sndWorkerInternalError c sndFileId sndFileEntityId prefixPath err = do
+sndWorkerInternalError :: AgentClient -> DBSndFileId -> SndFileId -> Maybe FilePath -> String -> AM ()
+sndWorkerInternalError c sndFileId sndFileEntityId prefixPath internalErrStr = do
  lift . forM_ prefixPath $ removePath <=< toFSFilePath
-  withStore' c $ \db -> updateSndFileError db sndFileId (show err)
-  notify c sndFileEntityId $ SFERR err
+  withStore' c $ \db -> updateSndFileError db sndFileId internalErrStr
+  notify c sndFileEntityId $ SFERR $ INTERNAL internalErrStr

 runXFTPSndWorker :: AgentClient -> XFTPServer -> Worker -> AM ()
 runXFTPSndWorker c srv Worker {doWork} = do
@@ -477,29 +451,29 @@ runXFTPSndWorker c srv Worker {doWork} = do
    runXFTPOperation cfg
  where
    runXFTPOperation :: AgentConfig -> AM ()
-    runXFTPOperation cfg@AgentConfig {sndFilesTTL, reconnectInterval = ri, xftpConsecutiveRetries} = do
+    runXFTPOperation cfg@AgentConfig {sndFilesTTL, reconnectInterval = ri, xftpNotifyErrsOnRetry = notifyOnRetry, xftpConsecutiveRetries} = do
      withWork c doWork (\db -> getNextSndChunkToUpload db srv sndFilesTTL) $ \case
-        SndFileChunk {sndFileId, sndFileEntityId, filePrefixPath, replicas = []} -> sndWorkerInternalError c sndFileId sndFileEntityId (Just filePrefixPath) (INTERNAL "chunk has no replicas")
+        SndFileChunk {sndFileId, sndFileEntityId, filePrefixPath, replicas = []} -> sndWorkerInternalError c sndFileId sndFileEntityId (Just filePrefixPath) "chunk has no replicas"
        fc@SndFileChunk {userId, sndFileId, sndFileEntityId, filePrefixPath, digest, replicas = replica@SndFileChunkReplica {sndChunkReplicaId, server, delay} : _} -> do
          let ri' = maybe ri (\d -> ri {initialInterval = d, increaseAfter = 0}) delay
          withRetryIntervalLimit xftpConsecutiveRetries ri' $ \delay' loop -> do
-            liftIO $ waitForUserNetwork c
+            lift $ waitForUserNetwork c
            uploadFileChunk cfg fc replica
              `catchAgentError` \e -> retryOnError "XFTP snd worker" (retryLoop loop e delay') (retryDone e) e
          where
            retryLoop loop e replicaDelay = do
              flip catchAgentError (\_ -> pure ()) $ do
-                when (serverHostError e) $ notify c sndFileEntityId $ SFWARN e
+                when notifyOnRetry $ notify c sndFileEntityId $ SFERR e
                liftIO $ closeXFTPServerClient c userId server digest
                withStore' c $ \db -> updateSndChunkReplicaDelay db sndChunkReplicaId replicaDelay
              atomically $ assertAgentForeground c
              loop
-            retryDone = sndWorkerInternalError c sndFileId sndFileEntityId (Just filePrefixPath)
+            retryDone e = sndWorkerInternalError c sndFileId sndFileEntityId (Just filePrefixPath) (show e)
    uploadFileChunk :: AgentConfig -> SndFileChunk -> SndFileChunkReplica -> AM ()
    uploadFileChunk AgentConfig {xftpMaxRecipientsPerRequest = maxRecipients} sndFileChunk@SndFileChunk {sndFileId, userId, chunkSpec = chunkSpec@XFTPChunkSpec {filePath}, digest = chunkDigest} replica = do
      replica'@SndFileChunkReplica {sndChunkReplicaId} <- addRecipients sndFileChunk replica
      fsFilePath <- lift $ toFSFilePath filePath
-      unlessM (doesFileExist fsFilePath) $ throwE $ FILE NO_FILE
+      unlessM (doesFileExist fsFilePath) $ throwError $ INTERNAL "encrypted file doesn't exist on upload"
      let chunkSpec' = chunkSpec {filePath = fsFilePath} :: XFTPChunkSpec
      atomically $ assertAgentForeground c
      agentXFTPUploadChunk c userId chunkDigest replica' chunkSpec'
@@ -519,7 +493,7 @@ runXFTPSndWorker c srv Worker {doWork} = do
      where
        addRecipients :: SndFileChunk -> SndFileChunkReplica -> AM SndFileChunkReplica
        addRecipients ch@SndFileChunk {numRecipients} cr@SndFileChunkReplica {rcvIdsKeys}
-          | length rcvIdsKeys > numRecipients = throwE $ INTERNAL "too many recipients"
+          | length rcvIdsKeys > numRecipients = throwError $ INTERNAL "too many recipients"
          | length rcvIdsKeys == numRecipients = pure cr
          | otherwise = do
              let numRecipients' = min (numRecipients - length rcvIdsKeys) maxRecipients
@@ -527,22 +501,22 @@ runXFTPSndWorker c srv Worker {doWork} = do
              cr' <- withStore' c $ \db -> addSndChunkReplicaRecipients db cr $ L.toList rcvIdsKeys'
              addRecipients ch cr'
        sndFileToDescrs :: SndFile -> AM (ValidFileDescription 'FSender, [ValidFileDescription 'FRecipient])
-        sndFileToDescrs SndFile {digest = Nothing} = throwE $ INTERNAL "snd file has no digest"
-        sndFileToDescrs SndFile {chunks = []} = throwE $ INTERNAL "snd file has no chunks"
+        sndFileToDescrs SndFile {digest = Nothing} = throwError $ INTERNAL "snd file has no digest"
+        sndFileToDescrs SndFile {chunks = []} = throwError $ INTERNAL "snd file has no chunks"
        sndFileToDescrs SndFile {digest = Just digest, key, nonce, chunks = chunks@(fstChunk : _), redirect} = do
          let chunkSize = FileSize $ sndChunkSize fstChunk
              size = FileSize $ sum $ map (fromIntegral . sndChunkSize) chunks
          -- snd description
          sndDescrChunks <- mapM toSndDescrChunk chunks
          let fdSnd = FileDescription {party = SFSender, size, digest, key, nonce, chunkSize, chunks = sndDescrChunks, redirect = Nothing}
-          validFdSnd <- either (throwE . INTERNAL) pure $ validateFileDescription fdSnd
+          validFdSnd <- either (throwError . INTERNAL) pure $ validateFileDescription fdSnd
          -- rcv descriptions
          let fdRcv = FileDescription {party = SFRecipient, size, digest, key, nonce, chunkSize, chunks = [], redirect}
              fdRcvs = createRcvFileDescriptions fdRcv chunks
-          validFdRcvs <- either (throwE . INTERNAL) pure $ mapM validateFileDescription fdRcvs
+          validFdRcvs <- either (throwError . INTERNAL) pure $ mapM validateFileDescription fdRcvs
          pure (validFdSnd, validFdRcvs)
        toSndDescrChunk :: SndFileChunk -> AM FileChunk
-        toSndDescrChunk SndFileChunk {replicas = []} = throwE $ INTERNAL "snd file chunk has no replicas"
+        toSndDescrChunk SndFileChunk {replicas = []} = throwError $ INTERNAL "snd file chunk has no replicas"
        toSndDescrChunk ch@SndFileChunk {chunkNo, digest = chDigest, replicas = (SndFileChunkReplica {server, replicaId, replicaKey} : _)} = do
          let chunkSize = FileSize $ sndChunkSize ch
              replicas = [FileChunkReplica {server, replicaId, replicaKey}]
@@ -643,20 +617,20 @@ runXFTPDelWorker c srv Worker {doWork} = do
    runXFTPOperation cfg
  where
    runXFTPOperation :: AgentConfig -> AM ()
-    runXFTPOperation AgentConfig {rcvFilesTTL, reconnectInterval = ri, xftpConsecutiveRetries} = do
+    runXFTPOperation AgentConfig {rcvFilesTTL, reconnectInterval = ri, xftpNotifyErrsOnRetry = notifyOnRetry, xftpConsecutiveRetries} = do
      -- no point in deleting files older than rcv ttl, as they will be expired on server
      withWork c doWork (\db -> getNextDeletedSndChunkReplica db srv rcvFilesTTL) processDeletedReplica
      where
        processDeletedReplica replica@DeletedSndChunkReplica {deletedSndChunkReplicaId, userId, server, chunkDigest, delay} = do
          let ri' = maybe ri (\d -> ri {initialInterval = d, increaseAfter = 0}) delay
          withRetryIntervalLimit xftpConsecutiveRetries ri' $ \delay' loop -> do
-            liftIO $ waitForUserNetwork c
+            lift $ waitForUserNetwork c
            deleteChunkReplica
              `catchAgentError` \e -> retryOnError "XFTP del worker" (retryLoop loop e delay') (retryDone e) e
          where
            retryLoop loop e replicaDelay = do
              flip catchAgentError (\_ -> pure ()) $ do
-                when (serverHostError e) $ notify c "" $ SFWARN e
+                when notifyOnRetry $ notify c "" $ SFERR e
                liftIO $ closeXFTPServerClient c userId server chunkDigest
                withStore' c $ \db -> updateDeletedSndChunkReplicaDelay db deletedSndChunkReplicaId replicaDelay
              atomically $ assertAgentForeground c
@@ -14,7 +14,6 @@ module Simplex.FileTransfer.Client where
 import Control.Logger.Simple
 import Control.Monad
 import Control.Monad.Except
-import Control.Monad.Trans.Except
 import Crypto.Random (ChaChaDRG)
 import Data.Bifunctor (first)
 import Data.ByteString.Builder (Builder, byteString)
@@ -39,8 +38,8 @@ import Simplex.Messaging.Client
    defaultNetworkConfig,
    proxyUsername,
    transportClientConfig,
-    unexpectedResponse,
  )
+import Simplex.Messaging.Client.Agent ()
 import qualified Simplex.Messaging.Crypto as C
 import qualified Simplex.Messaging.Crypto.Lazy as LC
 import Simplex.Messaging.Encoding (smpDecode, smpEncode)
@@ -52,13 +51,13 @@ import Simplex.Messaging.Protocol
    RecipientId,
    SenderId,
  )
-import Simplex.Messaging.Transport (ALPN, HandshakeError (..), THandleAuth (..), THandleParams (..), TransportError (..), TransportPeer (..), supportedParameters)
+import Simplex.Messaging.Transport (ALPN, HandshakeError (VERSION), THandleAuth (..), THandleParams (..), TransportError (..), TransportPeer (..), supportedParameters)
 import Simplex.Messaging.Transport.Client (TransportClientConfig, TransportHost, alpn)
 import Simplex.Messaging.Transport.HTTP2
 import Simplex.Messaging.Transport.HTTP2.Client
 import Simplex.Messaging.Transport.HTTP2.File
-import Simplex.Messaging.Util (liftEitherWith, liftError', tshow, whenM)
-import Simplex.Messaging.Version
+import Simplex.Messaging.Util (bshow, liftEitherWith, liftError', tshow, whenM)
+import Simplex.Messaging.Version (compatibleVersion, pattern Compatible)
 import UnliftIO
 import UnliftIO.Directory

@@ -100,23 +99,22 @@ defaultXFTPClientConfig =

 getXFTPClient :: TransportSession FileResponse -> XFTPClientConfig -> (XFTPClient -> IO ()) -> IO (Either XFTPClientError XFTPClient)
 getXFTPClient transportSession@(_, srv, _) config@XFTPClientConfig {clientALPN, xftpNetworkConfig, serverVRange} disconnected = runExceptT $ do
-  let username = proxyUsername transportSession
+  let tcConfig = (transportClientConfig xftpNetworkConfig) {alpn = clientALPN}
+      http2Config = xftpHTTP2Config tcConfig config
+      username = proxyUsername transportSession
      ProtocolServer _ host port keyHash = srv
  useHost <- liftEither $ chooseTransportHost xftpNetworkConfig host
-  let tcConfig = (transportClientConfig xftpNetworkConfig useHost) {alpn = clientALPN}
-      http2Config = xftpHTTP2Config tcConfig config
  clientVar <- newTVarIO Nothing
  let usePort = if null port then "443" else port
      clientDisconnected = readTVarIO clientVar >>= mapM_ disconnected
  http2Client <- liftError' xftpClientError $ getVerifiedHTTP2Client (Just username) useHost usePort (Just keyHash) Nothing http2Config clientDisconnected
  let HTTP2Client {sessionId, sessionALPN} = http2Client
-      v = VersionXFTP 1
-      thServerVRange = versionToRange v
-      thParams0 = THandleParams {sessionId, blockSize = xftpBlockSize, thVersion = v, thServerVRange, thAuth = Nothing, implySessId = False, batch = True}
+      thParams0 = THandleParams {sessionId, blockSize = xftpBlockSize, thVersion = VersionXFTP 1, thAuth = Nothing, implySessId = False, batch = True}
  logDebug $ "Client negotiated handshake protocol: " <> tshow sessionALPN
  thParams@THandleParams {thVersion} <- case sessionALPN of
    Just "xftp/1" -> xftpClientHandshakeV1 serverVRange keyHash http2Client thParams0
-    _ -> pure thParams0
+    Nothing -> pure thParams0
+    _ -> throwError $ PCETransportError (TEHandshake VERSION)
  logDebug $ "Client negotiated protocol: " <> tshow thVersion
  let c = XFTPClient {http2Client, thParams, transportSession, config}
  atomically $ writeTVar clientVar $ Just c
@@ -125,24 +123,23 @@ getXFTPClient transportSession@(_, srv, _) config@XFTPClientConfig {clientALPN,
 xftpClientHandshakeV1 :: VersionRangeXFTP -> C.KeyHash -> HTTP2Client -> THandleParamsXFTP 'TClient -> ExceptT XFTPClientError IO (THandleParamsXFTP 'TClient)
 xftpClientHandshakeV1 serverVRange keyHash@(C.KeyHash kh) c@HTTP2Client {sessionId, serverKey} thParams0 = do
  shs@XFTPServerHandshake {authPubKey = ck} <- getServerHandshake
-  (vr, sk) <- processServerHandshake shs
-  let v = maxVersion vr
+  (v, sk) <- processServerHandshake shs
  sendClientHandshake XFTPClientHandshake {xftpVersion = v, keyHash}
-  pure thParams0 {thAuth = Just THAuthClient {serverPeerPubKey = sk, serverCertKey = ck, sessSecret = Nothing}, thVersion = v, thServerVRange = vr}
+  pure thParams0 {thAuth = Just THAuthClient {serverPeerPubKey = sk, serverCertKey = ck, sessSecret = Nothing}, thVersion = v}
  where
    getServerHandshake :: ExceptT XFTPClientError IO XFTPServerHandshake
    getServerHandshake = do
      let helloReq = H.requestNoBody "POST" "/" []
      HTTP2Response {respBody = HTTP2Body {bodyHead = shsBody}} <-
-        liftError' xftpClientError $ sendRequest c helloReq Nothing
-      liftTransportErr (TEHandshake PARSE) . smpDecode =<< liftTransportErr TEBadBlock (C.unPad shsBody)
-    processServerHandshake :: XFTPServerHandshake -> ExceptT XFTPClientError IO (VersionRangeXFTP, C.PublicKeyX25519)
+        liftError' (const $ PCEResponseError HANDSHAKE) $ sendRequest c helloReq Nothing
+      liftHS . smpDecode =<< liftHS (C.unPad shsBody)
+    processServerHandshake :: XFTPServerHandshake -> ExceptT XFTPClientError IO (VersionXFTP, C.PublicKeyX25519)
    processServerHandshake XFTPServerHandshake {xftpVersionRange, sessionId = serverSessId, authPubKey = serverAuth} = do
-      unless (sessionId == serverSessId) $ throwE $ PCETransportError TEBadSession
-      case xftpVersionRange `compatibleVRange` serverVRange of
-        Nothing -> throwE $ PCETransportError TEVersion
-        Just (Compatible vr) ->
-          fmap (vr,) . liftTransportErr (TEHandshake BAD_AUTH) $ do
+      unless (sessionId == serverSessId) $ throwError $ PCEResponseError SESSION
+      case xftpVersionRange `compatibleVersion` serverVRange of
+        Nothing -> throwError $ PCEResponseError HANDSHAKE
+        Just (Compatible v) ->
+          fmap (v,) . liftHS $ do
            let (X.CertificateChain cert, exact) = serverAuth
            case cert of
              [_leaf, ca] | XV.Fingerprint kh == XV.getFingerprint ca X.HashSHA256 -> pure ()
@@ -151,11 +148,11 @@ xftpClientHandshakeV1 serverVRange keyHash@(C.KeyHash kh) c@HTTP2Client {session
            C.x509ToPublic (pubKey, []) >>= C.pubKey
    sendClientHandshake :: XFTPClientHandshake -> ExceptT XFTPClientError IO ()
    sendClientHandshake chs = do
-      chs' <- liftTransportErr TELargeMsg $ C.pad (smpEncode chs) xftpBlockSize
+      chs' <- liftHS $ C.pad (smpEncode chs) xftpBlockSize
      let chsReq = H.requestBuilder "POST" "/" [] $ byteString chs'
-      HTTP2Response {respBody = HTTP2Body {bodyHead}} <- liftError' xftpClientError $ sendRequest c chsReq Nothing
-      unless (B.null bodyHead) $ throwE $ PCETransportError TEBadBlock
-    liftTransportErr e = liftEitherWith (const $ PCETransportError e)
+      HTTP2Response {respBody = HTTP2Body {bodyHead}} <- liftError' (const $ PCEResponseError HANDSHAKE) $ sendRequest c chsReq Nothing
+      unless (B.null bodyHead) $ throwError $ PCEResponseError HANDSHAKE
+    liftHS = liftEitherWith (const $ PCEResponseError HANDSHAKE)

 closeXFTPClient :: XFTPClient -> IO ()
 closeXFTPClient XFTPClient {http2Client} = closeHTTP2Client http2Client
@@ -188,11 +185,9 @@ xftpClientError = \case

 sendXFTPCommand :: forall p. FilePartyI p => XFTPClient -> C.APrivateAuthKey -> XFTPFileId -> FileCommand p -> Maybe XFTPChunkSpec -> ExceptT XFTPClientError IO (FileResponse, HTTP2Body)
 sendXFTPCommand c@XFTPClient {thParams} pKey fId cmd chunkSpec_ = do
-  -- TODO random corrId
-  let corrIdUsedAsNonce = ""
  t <-
    liftEither . first PCETransportError $
-      xftpEncodeAuthTransmission thParams pKey (corrIdUsedAsNonce, fId, FileCmd (sFileParty @p) cmd)
+      xftpEncodeAuthTransmission thParams pKey ("", fId, FileCmd (sFileParty @p) cmd)
  sendXFTPTransmission c t chunkSpec_

 sendXFTPTransmission :: XFTPClient -> ByteString -> Maybe XFTPChunkSpec -> ExceptT XFTPClientError IO (FileResponse, HTTP2Body)
@@ -200,14 +195,14 @@ sendXFTPTransmission XFTPClient {config, thParams, http2Client} t chunkSpec_ = d
  let req = H.requestStreaming N.methodPost "/" [] streamBody
      reqTimeout = xftpReqTimeout config $ (\XFTPChunkSpec {chunkSize} -> chunkSize) <$> chunkSpec_
  HTTP2Response {respBody = body@HTTP2Body {bodyHead}} <- withExceptT xftpClientError . ExceptT $ sendRequest http2Client req (Just reqTimeout)
-  when (B.length bodyHead /= xftpBlockSize) $ throwE $ PCEResponseError BLOCK
+  when (B.length bodyHead /= xftpBlockSize) $ throwError $ PCEResponseError BLOCK
  -- TODO validate that the file ID is the same as in the request?
  (_, _, (_, _fId, respOrErr)) <- liftEither . first PCEResponseError $ xftpDecodeTransmission thParams bodyHead
  case respOrErr of
    Right r -> case protocolError r of
-      Just e -> throwE $ PCEProtocolError e
+      Just e -> throwError $ PCEProtocolError e
      _ -> pure (r, body)
-    Left e -> throwE $ PCEResponseError e
+    Left e -> throwError $ PCEResponseError e
  where
    streamBody :: (Builder -> IO ()) -> IO () -> IO ()
    streamBody send done = do
@@ -215,7 +210,7 @@ sendXFTPTransmission XFTPClient {config, thParams, http2Client} t chunkSpec_ = d
      forM_ chunkSpec_ $ \XFTPChunkSpec {filePath, chunkOffset, chunkSize} ->
        withFile filePath ReadMode $ \h -> do
          hSeek h AbsoluteSeek $ fromIntegral chunkOffset
-          hSendFile h send chunkSize
+          hSendFile h send $ fromIntegral chunkSize
      done

 createXFTPChunk ::
@@ -228,13 +223,13 @@ createXFTPChunk ::
 createXFTPChunk c spKey file rcps auth_ =
  sendXFTPCommand c spKey "" (FNEW file rcps auth_) Nothing >>= \case
    (FRSndIds sId rIds, body) -> noFile body (sId, rIds)
-    (r, _) -> throwE $ unexpectedResponse r
+    (r, _) -> throwError . PCEUnexpectedResponse $ bshow r

 addXFTPRecipients :: XFTPClient -> C.APrivateAuthKey -> XFTPFileId -> NonEmpty C.APublicAuthKey -> ExceptT XFTPClientError IO (NonEmpty RecipientId)
 addXFTPRecipients c spKey fId rcps =
  sendXFTPCommand c spKey fId (FADD rcps) Nothing >>= \case
    (FRRcvIds rIds, body) -> noFile body rIds
-    (r, _) -> throwE $ unexpectedResponse r
+    (r, _) -> throwError . PCEUnexpectedResponse $ bshow r

 uploadXFTPChunk :: XFTPClient -> C.APrivateAuthKey -> XFTPFileId -> XFTPChunkSpec -> ExceptT XFTPClientError IO ()
 uploadXFTPChunk c spKey fId chunkSpec =
@@ -250,7 +245,7 @@ downloadXFTPChunk g c@XFTPClient {config} rpKey fId chunkSpec@XFTPRcvChunkSpec {
        let dhSecret = C.dh' sDhKey rpDhKey
        cbState <- liftEither . first PCECryptoError $ LC.cbInit dhSecret cbNonce
        let t = chunkTimeout config chunkSize
-        ExceptT (sequence <$> (t `timeout` (download cbState `catches` errors))) >>= maybe (throwE PCEResponseTimeout) pure
+        ExceptT (sequence <$> (t `timeout` (download cbState `catches` errors))) >>= maybe (throwError PCEResponseTimeout) pure
        where
          errors =
            [ Handler $ \(_e :: H.HTTP2Error) -> pure $ Left PCENetworkError,
@@ -260,9 +255,9 @@ downloadXFTPChunk g c@XFTPClient {config} rpKey fId chunkSpec@XFTPRcvChunkSpec {
          download cbState =
            runExceptT . withExceptT PCEResponseError $
              receiveEncFile chunkPart cbState chunkSpec `catchError` \e ->
-                whenM (doesFileExist filePath) (removeFile filePath) >> throwE e
-      _ -> throwE $ PCEResponseError NO_FILE
-    (r, _) -> throwE $ unexpectedResponse r
+                whenM (doesFileExist filePath) (removeFile filePath) >> throwError e
+      _ -> throwError $ PCEResponseError NO_FILE
+    (r, _) -> throwError . PCEUnexpectedResponse $ bshow r

 xftpReqTimeout :: XFTPClientConfig -> Maybe Word32 -> Int
 xftpReqTimeout cfg@XFTPClientConfig {xftpNetworkConfig = NetworkConfig {tcpTimeout}} chunkSize_ =
@@ -286,17 +281,17 @@ pingXFTP c@XFTPClient {thParams} = do
  (r, _) <- sendXFTPTransmission c t Nothing
  case r of
    FRPong -> pure ()
-    _ -> throwE $ unexpectedResponse r
+    _ -> throwError $ PCEUnexpectedResponse $ bshow r

 okResponse :: (FileResponse, HTTP2Body) -> ExceptT XFTPClientError IO ()
 okResponse = \case
  (FROk, body) -> noFile body ()
-  (r, _) -> throwE $ unexpectedResponse r
+  (r, _) -> throwError . PCEUnexpectedResponse $ bshow r

 -- TODO this currently does not check anything because response size is not set and bodyPart is always Just
 noFile :: HTTP2Body -> a -> ExceptT XFTPClientError IO a
 noFile HTTP2Body {bodyPart} a = case bodyPart of
-  Just _ -> pure a -- throwE $ PCEResponseError HAS_FILE
+  Just _ -> pure a -- throwError $ PCEResponseError HAS_FILE
  _ -> pure a

 -- FACK :: FileCommand Recipient
@@ -11,7 +11,6 @@ import Control.Logger.Simple (logInfo)
 import Control.Monad
 import Control.Monad.Except
 import Control.Monad.Trans (lift)
-import Control.Monad.Trans.Except
 import Data.Bifunctor (first)
 import qualified Data.ByteString.Char8 as B
 import Data.Text (Text)
@@ -19,6 +18,7 @@ import Data.Text.Encoding (decodeUtf8)
 import Simplex.FileTransfer.Client
 import Simplex.Messaging.Agent.RetryInterval
 import Simplex.Messaging.Client (NetworkConfig (..), ProtocolClientError (..), temporaryClientError)
+import Simplex.Messaging.Client.Agent ()
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Protocol (ProtocolServer (..), XFTPServer)
 import Simplex.Messaging.TMap (TMap)
@@ -109,7 +109,7 @@ getXFTPServerClient XFTPClientAgent {xftpClients, config} srv = do
                else atomically $ do
                  putTMVar clientVar r
                  TM.delete srv xftpClients
-              throwE e
+              throwError e
        tryConnectAsync :: ME ()
        tryConnectAsync = void . lift . async . runExceptT $ do
          withRetryInterval (reconnectInterval config) $ \_ loop -> void $ tryConnectClient loop
@@ -30,7 +30,6 @@ where
 import Control.Logger.Simple
 import Control.Monad
 import Control.Monad.Except
-import Control.Monad.Trans.Except
 import Crypto.Random (ChaChaDRG)
 import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.Bifunctor (first)
@@ -293,7 +292,7 @@ cliSendFileOpts SendOptions {filePath, outputDir, numRecipients, xftpServers, re
    encryptFileForUpload :: TVar ChaChaDRG -> String -> ExceptT CLIError IO (FilePath, FileDescription 'FRecipient, FileDescription 'FSender, [XFTPChunkSpec], Int64)
    encryptFileForUpload g fileName = do
      fileSize <- fromInteger <$> getFileSize filePath
-      when (fileSize > maxFileSize) $ throwE $ CLIError $ "Files bigger than " <> maxFileSizeStr <> " are not supported"
+      when (fileSize > maxFileSize) $ throwError $ CLIError $ "Files bigger than " <> maxFileSizeStr <> " are not supported"
      encPath <- getEncPath tempPath "xftp"
      key <- atomically $ C.randomSbKey g
      nonce <- atomically $ C.randomCbNonce g
@@ -324,7 +323,7 @@ cliSendFileOpts SendOptions {filePath, outputDir, numRecipients, xftpServers, re
      -- upload doesn't allow other requests within the same client until complete (but download does allow).
      logInfo $ "uploading " <> tshow (length chunks) <> " chunks..."
      (errs, rs) <- partitionEithers . concat <$> liftIO (pooledForConcurrentlyN 16 chunks' . mapM $ runExceptT . uploadFileChunk a)
-      mapM_ throwE errs
+      mapM_ throwError errs
      pure $ map snd (sortOn fst rs)
      where
        uploadFileChunk :: XFTPClientAgent -> (Int, XFTPChunkSpec, XFTPServerWithAuth) -> ExceptT CLIError IO (Int, SentFileChunk)
@@ -333,7 +332,7 @@ cliSendFileOpts SendOptions {filePath, outputDir, numRecipients, xftpServers, re
          (sndKey, spKey) <- atomically $ C.generateAuthKeyPair C.SEd25519 g
          rKeys <- atomically $ L.fromList <$> replicateM numRecipients (C.generateAuthKeyPair C.SEd25519 g)
          digest <- liftIO $ getChunkDigest chunkSpec
-          let ch = FileInfo {sndKey, size = chunkSize, digest}
+          let ch = FileInfo {sndKey, size = fromIntegral chunkSize, digest}
          c <- withRetry retryCount $ getXFTPServerClient a xftpServer
          (sndId, rIds) <- withRetry retryCount $ createXFTPChunk c spKey ch (L.map fst rKeys) auth
          withReconnect a xftpServer retryCount $ \c' -> uploadXFTPChunk c' spKey sndId chunkSpec
@@ -345,7 +344,7 @@ cliSendFileOpts SendOptions {filePath, outputDir, numRecipients, xftpServers, re
            when verbose $ putStrLn ""
          let recipients = L.toList $ L.map ChunkReplicaId rIds `L.zip` L.map snd rKeys
              replicas = [SentFileChunkReplica {server = xftpServer, recipients}]
-          pure (chunkNo, SentFileChunk {chunkNo, sndId, sndPrivateKey = spKey, chunkSize = FileSize chunkSize, digest = FileDigest digest, replicas})
+          pure (chunkNo, SentFileChunk {chunkNo, sndId, sndPrivateKey = spKey, chunkSize = FileSize $ fromIntegral chunkSize, digest = FileDigest digest, replicas})
        getXFTPServer :: TVar StdGen -> NonEmpty XFTPServerWithAuth -> IO XFTPServerWithAuth
        getXFTPServer gen = \case
          srv :| [] -> pure srv
@@ -438,12 +437,12 @@ cliReceiveFile ReceiveOptions {fileDescription, filePath, retryCount, tempPath,
          srvChunks = groupAllOn srv chunks
      g <- liftIO C.newRandom
      (errs, rs) <- partitionEithers . concat <$> liftIO (pooledForConcurrentlyN 16 srvChunks $ mapM $ runExceptT . downloadFileChunk g a encPath size downloadedChunks)
-      mapM_ throwE errs
+      mapM_ throwError errs
      let chunkPaths = map snd $ sortOn fst rs
      encDigest <- liftIO $ LC.sha512Hash <$> readChunks chunkPaths
-      when (encDigest /= unFileDigest digest) $ throwE $ CLIError "File digest mismatch"
+      when (encDigest /= unFileDigest digest) $ throwError $ CLIError "File digest mismatch"
      encSize <- liftIO $ foldM (\s path -> (s +) . fromIntegral <$> getFileSize path) 0 chunkPaths
-      when (FileSize encSize /= size) $ throwE $ CLIError "File size mismatch"
+      when (FileSize encSize /= size) $ throwError $ CLIError "File size mismatch"
      liftIO $ printNoNewLine "Decrypting file..."
      CryptoFile path _ <- withExceptT cliCryptoError $ decryptChunks encSize chunkPaths key nonce $ fmap CF.plain . getFilePath
      forM_ chunks $ acknowledgeFileChunk a
@@ -465,20 +464,20 @@ cliReceiveFile ReceiveOptions {fileDescription, filePath, retryCount, tempPath,
        printProgress "Downloaded" downloaded encSize
        when verbose $ putStrLn ""
      pure (chunkNo, chunkPath)
-    downloadFileChunk _ _ _ _ _ _ = throwE $ CLIError "chunk has no replicas"
+    downloadFileChunk _ _ _ _ _ _ = throwError $ CLIError "chunk has no replicas"
    getFilePath :: String -> ExceptT String IO FilePath
    getFilePath name =
      case filePath of
        Just path ->
          ifM (doesDirectoryExist path) (uniqueCombine path name) $
-            ifM (doesFileExist path) (throwE "File already exists") (pure path)
+            ifM (doesFileExist path) (throwError "File already exists") (pure path)
        _ -> (`uniqueCombine` name) . (</> "Downloads") =<< getHomeDirectory
    acknowledgeFileChunk :: XFTPClientAgent -> FileChunk -> ExceptT CLIError IO ()
    acknowledgeFileChunk a FileChunk {replicas = replica : _} = do
      let FileChunkReplica {server, replicaId, replicaKey} = replica
      c <- withRetry retryCount $ getXFTPServerClient a server
      withRetry retryCount $ ackXFTPChunk c replicaKey (unChunkReplicaId replicaId)
-    acknowledgeFileChunk _ _ = throwE $ CLIError "chunk has no replicas"
+    acknowledgeFileChunk _ _ = throwError $ CLIError "chunk has no replicas"

 printProgress :: String -> Int64 -> Int64 -> IO ()
 printProgress s part total = printNoNewLine $ s <> " " <> show ((part * 100) `div` total) <> "%"
@@ -504,7 +503,7 @@ cliDeleteFile DeleteOptions {fileDescription, retryCount, yes} = do
      let FileChunkReplica {server, replicaId, replicaKey} = replica
      withReconnect a server retryCount $ \c -> deleteXFTPChunk c replicaKey (unChunkReplicaId replicaId)
      logInfo $ "deleted chunk " <> tshow chunkNo <> " from " <> showServer server
-    deleteFileChunk _ _ = throwE $ CLIError "chunk has no replicas"
+    deleteFileChunk _ _ = throwError $ CLIError "chunk has no replicas"

 cliFileDescrInfo :: InfoOptions -> ExceptT CLIError IO ()
 cliFileDescrInfo InfoOptions {fileDescription} = do
@@ -534,7 +533,7 @@ getFileDescription path =
 getFileDescription' :: FilePartyI p => FilePath -> ExceptT CLIError IO (ValidFileDescription p)
 getFileDescription' path =
  getFileDescription path >>= \case
-    AVFD fd -> either (throwE . CLIError) pure $ checkParty fd
+    AVFD fd -> either (throwError . CLIError) pure $ checkParty fd

 singleChunkSize :: Int64 -> Maybe Word32
 singleChunkSize size' =
@@ -564,7 +563,7 @@ prepareChunkSpecs filePath chunkSizes = reverse . snd $ foldl' addSpec (0, []) c
  where
    addSpec :: (Int64, [XFTPChunkSpec]) -> Word32 -> (Int64, [XFTPChunkSpec])
    addSpec (chunkOffset, specs) sz =
-      let spec = XFTPChunkSpec {filePath, chunkOffset, chunkSize = sz}
+      let spec = XFTPChunkSpec {filePath, chunkOffset, chunkSize = fromIntegral sz}
       in (chunkOffset + fromIntegral sz, spec : specs)

 getEncPath :: MonadIO m => Maybe FilePath -> String -> m FilePath
@@ -575,13 +574,13 @@ withReconnect a srv n run = withRetry n $ do
  c <- withRetry n $ getXFTPServerClient a srv
  withExceptT (CLIError . show) (run c) `catchError` \e -> do
    liftIO $ closeXFTPServerClient a srv
-    throwE e
+    throwError e

 withRetry :: Show e => Int -> ExceptT e IO a -> ExceptT CLIError IO a
 withRetry retryCount = withRetry' retryCount . withExceptT (CLIError . show)
  where
    withRetry' :: Int -> ExceptT CLIError IO a -> ExceptT CLIError IO a
-    withRetry' 0 _ = throwE $ CLIError "internal: no retry attempts"
+    withRetry' 0 _ = throwError $ CLIError "internal: no retry attempts"
    withRetry' 1 a = a
    withRetry' n a =
      a `catchError` \e -> do
@@ -8,7 +8,6 @@ module Simplex.FileTransfer.Crypto where

 import Control.Monad
 import Control.Monad.Except
-import Control.Monad.Trans.Except
 import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.Bifunctor (first)
 import qualified Data.ByteArray as BA
@@ -49,17 +48,17 @@ encryptFile srcFile fileHdr key nonce fileSize' encSize encFile = do
      | otherwise = do
          let chSize = min len 65536
          ch <- liftIO $ get chSize
-          when (B.length ch /= fromIntegral chSize) $ throwE $ FTCEFileIOError "encrypting file: unexpected EOF"
+          when (B.length ch /= fromIntegral chSize) $ throwError $ FTCEFileIOError "encrypting file: unexpected EOF"
          let (ch', sb') = LC.sbEncryptChunk sb ch
          liftIO $ B.hPut w ch'
          encryptChunks_ get w (sb', len - chSize)

 decryptChunks :: Int64 -> [FilePath] -> C.SbKey -> C.CbNonce -> (String -> ExceptT String IO CryptoFile) -> ExceptT FTCryptoError IO CryptoFile
-decryptChunks _ [] _ _ _ = throwE $ FTCEInvalidHeader "empty"
+decryptChunks _ [] _ _ _ = throwError $ FTCEInvalidHeader "empty"
 decryptChunks encSize (chPath : chPaths) key nonce getDestFile = case reverse chPaths of
  [] -> do
    (!authOk, !f) <- liftEither . first FTCECryptoError . LC.sbDecryptTailTag key nonce (encSize - authTagSize) =<< liftIO (LB.readFile chPath)
-    unless authOk $ throwE FTCEInvalidAuthTag
+    unless authOk $ throwError FTCEInvalidAuthTag
    (FileHeader {fileName}, !f') <- parseFileHeader f
    destFile <- withExceptT FTCEFileIOError $ getDestFile fileName
    CF.writeFile destFile f'
@@ -74,7 +73,7 @@ decryptChunks encSize (chPath : chPaths) key nonce getDestFile = case reverse ch
      decryptLastChunk h state' expectedLen
    unless authOk $ do
      removeFile path
-      throwE FTCEInvalidAuthTag
+      throwError FTCEInvalidAuthTag
    pure destFile
    where
      decryptFirstChunk = do
@@ -106,8 +105,8 @@ decryptChunks encSize (chPath : chPaths) key nonce getDestFile = case reverse ch
    parseFileHeader s = do
      let (hdrStr, s') = LB.splitAt 1024 s
      case A.parse smpP $ LB.toStrict hdrStr of
-        A.Fail _ _ e -> throwE $ FTCEInvalidHeader e
-        A.Partial _ -> throwE $ FTCEInvalidHeader "incomplete"
+        A.Fail _ _ e -> throwError $ FTCEInvalidHeader e
+        A.Partial _ -> throwError $ FTCEInvalidHeader "incomplete"
        A.Done rest hdr -> pure (hdr, LB.fromStrict rest <> s')

 readChunks :: [FilePath] -> IO LB.ByteString
@@ -48,7 +48,6 @@ import Simplex.Messaging.Protocol
    SndPublicAuthKey,
    Transmission,
    TransmissionForAuth (..),
-    CorrId (..),
    encodeTransmission,
    encodeTransmissionForAuth,
    messageTagP,
@@ -329,7 +328,7 @@ checkParty' c = case testEquality (sFileParty @p) (sFileParty @p') of
 xftpEncodeAuthTransmission :: ProtocolEncoding XFTPVersion e c => THandleParams XFTPVersion 'TClient -> C.APrivateAuthKey -> Transmission c -> Either TransportError ByteString
 xftpEncodeAuthTransmission thParams@THandleParams {thAuth} pKey (corrId, fId, msg) = do
  let TransmissionForAuth {tForAuth, tToSend} = encodeTransmissionForAuth thParams (corrId, fId, msg)
-  xftpEncodeBatch1 . (,tToSend) =<< authTransmission thAuth (Just pKey) (C.cbNonce $ bs corrId) tForAuth
+  xftpEncodeBatch1 . (,tToSend) =<< authTransmission thAuth (Just pKey) corrId tForAuth

 xftpEncodeTransmission :: ProtocolEncoding XFTPVersion e c => THandleParams XFTPVersion p -> Transmission c -> Either TransportError ByteString
 xftpEncodeTransmission thParams (corrId, fId, msg) = do
@@ -1,4 +1,3 @@
-{-# LANGUAGE CPP #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE FlexibleContexts #-}
@@ -18,7 +17,6 @@ import Control.Logger.Simple
 import Control.Monad
 import Control.Monad.Except
 import Control.Monad.Reader
-import Control.Monad.Trans.Except
 import Data.Bifunctor (first)
 import qualified Data.ByteString.Base64.URL as B64
 import Data.ByteString.Builder (Builder, byteString)
@@ -65,13 +63,10 @@ import Simplex.Messaging.Transport.HTTP2.File (fileBlockSize)
 import Simplex.Messaging.Transport.HTTP2.Server
 import Simplex.Messaging.Transport.Server (runTCPServer, tlsServerCredentials)
 import Simplex.Messaging.Util
-import Simplex.Messaging.Version
+import Simplex.Messaging.Version (isCompatible)
 import System.Exit (exitFailure)
 import System.FilePath ((</>))
 import System.IO (hPrint, hPutStrLn, universalNewlineMode)
-#ifdef slow_servers
-import System.Random (getStdRandom, randomR)
-#endif
 import UnliftIO
 import UnliftIO.Concurrent (threadDelay)
 import UnliftIO.Directory (doesFileExist, removeFile, renameFile)
@@ -96,10 +91,10 @@ runXFTPServerBlocking started cfg = newXFTPServerEnv cfg >>= runReaderT (xftpSer

 data Handshake
  = HandshakeSent C.PrivateKeyX25519
-  | HandshakeAccepted (THandleParams XFTPVersion 'TServer)
+  | HandshakeAccepted (THandleAuth 'TServer) VersionXFTP

 xftpServer :: XFTPServerConfig -> TMVar Bool -> M ()
-xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig, inactiveClientExpiration, fileExpiration, xftpServerVRange} started = do
+xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig, inactiveClientExpiration, fileExpiration} started = do
  mapM_ (expireServerFiles Nothing) fileExpiration
  restoreServerStats
  raceAny_ (runServer : expireFilesThread_ cfg <> serverStatsThread_ cfg <> controlPortThread_ cfg) `finally` stopServer
@@ -116,9 +111,7 @@ xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig, inactiveClientExpira
      let cleanup sessionId = atomically $ TM.delete sessionId sessions
      liftIO . runHTTP2Server started xftpPort defaultHTTP2BufferSize serverParams transportConfig inactiveClientExpiration cleanup $ \sessionId sessionALPN r sendResponse -> do
        reqBody <- getHTTP2Body r xftpBlockSize
-        let v = VersionXFTP 1
-            thServerVRange = versionToRange v
-            thParams0 = THandleParams {sessionId, blockSize = xftpBlockSize, thVersion = v, thServerVRange, thAuth = Nothing, implySessId = False, batch = True}
+        let thParams0 = THandleParams {sessionId, blockSize = xftpBlockSize, thVersion = VersionXFTP 1, thAuth = Nothing, implySessId = False, batch = True}
            req0 = XFTPTransportRequest {thParams = thParams0, request = r, reqBody, sendResponse}
        flip runReaderT env $ case sessionALPN of
          Nothing -> processRequest req0
@@ -128,43 +121,34 @@ xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig, inactiveClientExpira
              Just thParams -> processRequest req0 {thParams} -- proceed with new version (XXX: may as well switch the request handler here)
          _ -> liftIO . sendResponse $ H.responseNoBody N.ok200 [] -- shouldn't happen: means server picked handshake protocol it doesn't know about
    xftpServerHandshakeV1 :: X.CertificateChain -> C.APrivateSignKey -> TMap SessionId Handshake -> XFTPTransportRequest -> M (Maybe (THandleParams XFTPVersion 'TServer))
-    xftpServerHandshakeV1 chain serverSignKey sessions XFTPTransportRequest {thParams = thParams0@THandleParams {sessionId}, reqBody = HTTP2Body {bodyHead}, sendResponse} = do
+    xftpServerHandshakeV1 chain serverSignKey sessions XFTPTransportRequest {thParams = thParams@THandleParams {sessionId}, reqBody = HTTP2Body {bodyHead}, sendResponse} = do
      s <- atomically $ TM.lookup sessionId sessions
      r <- runExceptT $ case s of
        Nothing -> processHello
        Just (HandshakeSent pk) -> processClientHandshake pk
-        Just (HandshakeAccepted thParams) -> pure $ Just thParams
+        Just (HandshakeAccepted auth v) -> pure $ Just thParams {thAuth = Just auth, thVersion = v}
      either sendError pure r
      where
        processHello = do
-          unless (B.null bodyHead) $ throwE HANDSHAKE
+          unless (B.null bodyHead) $ throwError HANDSHAKE
          (k, pk) <- atomically . C.generateKeyPair =<< asks random
          atomically $ TM.insert sessionId (HandshakeSent pk) sessions
          let authPubKey = (chain, C.signX509 serverSignKey $ C.publicToX509 k)
-          let hs = XFTPServerHandshake {xftpVersionRange = xftpServerVRange, sessionId, authPubKey}
+          let hs = XFTPServerHandshake {xftpVersionRange = supportedFileServerVRange, sessionId, authPubKey}
          shs <- encodeXftp hs
-#ifdef slow_servers
-          lift randomDelay
-#endif
          liftIO . sendResponse $ H.responseBuilder N.ok200 [] shs
          pure Nothing
        processClientHandshake pk = do
-          unless (B.length bodyHead == xftpBlockSize) $ throwE HANDSHAKE
+          unless (B.length bodyHead == xftpBlockSize) $ throwError HANDSHAKE
          body <- liftHS $ C.unPad bodyHead
-          XFTPClientHandshake {xftpVersion = v, keyHash} <- liftHS $ smpDecode body
+          XFTPClientHandshake {xftpVersion, keyHash} <- liftHS $ smpDecode body
          kh <- asks serverIdentity
-          unless (keyHash == kh) $ throwE HANDSHAKE
-          case compatibleVRange' xftpServerVRange v of
-            Just (Compatible vr) -> do
-              let auth = THAuthServer {serverPrivKey = pk, sessSecret' = Nothing}
-                  thParams = thParams0 {thAuth = Just auth, thVersion = v, thServerVRange = vr}
-              atomically $ TM.insert sessionId (HandshakeAccepted thParams) sessions
-#ifdef slow_servers
-              lift randomDelay
-#endif
-              liftIO . sendResponse $ H.responseNoBody N.ok200 []
-              pure Nothing
-            Nothing -> throwE HANDSHAKE
+          unless (keyHash == kh) $ throwError HANDSHAKE
+          unless (xftpVersion `isCompatible` supportedFileServerVRange) $ throwError HANDSHAKE
+          let auth = THAuthServer {serverPrivKey = pk, sessSecret' = Nothing}
+          atomically $ TM.insert sessionId (HandshakeAccepted auth xftpVersion) sessions
+          liftIO . sendResponse $ H.responseNoBody N.ok200 []
+          pure Nothing
        sendError :: XFTPErrorType -> M (Maybe (THandleParams XFTPVersion 'TServer))
        sendError err = do
          runExceptT (encodeXftp err) >>= \case
@@ -326,9 +310,6 @@ processRequest XFTPTransportRequest {thParams, reqBody = body@HTTP2Body {bodyHea
  where
    sendXFTPResponse (corrId, fId, resp) serverFile_ = do
      let t_ = xftpEncodeTransmission thParams (corrId, fId, resp)
-#ifdef slow_servers
-      randomDelay
-#endif
      liftIO $ sendResponse $ H.responseStreaming N.ok200 [] $ streamBody t_
      where
        streamBody t_ send done = do
@@ -340,18 +321,9 @@ processRequest XFTPTransportRequest {thParams, reqBody = body@HTTP2Body {bodyHea
              send $ byteString t
              -- timeout sending file in the same way as receiving
              forM_ serverFile_ $ \ServerFile {filePath, fileSize, sbState} -> do
-                withFile filePath ReadMode $ \h -> sendEncFile h send sbState fileSize
+                withFile filePath ReadMode $ \h -> sendEncFile h send sbState (fromIntegral fileSize)
          done

-#ifdef slow_servers
-randomDelay :: M ()
-randomDelay = do
-  d <- asks $ responseDelay . config
-  when (d > 0) $ do
-    pc <- getStdRandom (randomR (-200, 200))
-    threadDelay $ (d * (1000 + pc)) `div` 1000
-#endif
-
 data VerificationResult = VRVerified XFTPRequest | VRFailed

 verifyXFTPTransmission :: Maybe (THandleAuth 'TServer, C.CbNonce) -> Maybe TransmissionAuth -> ByteString -> XFTPFileId -> FileCmd -> M VerificationResult
@@ -396,7 +368,7 @@ processXFTPRequest HTTP2Body {bodyPart} = \case
      st <- asks store
      r <- runExceptT $ do
        sizes <- asks $ allowedChunkSizes . config
-        unless (size file `elem` sizes) $ throwE SIZE
+        unless (size file `elem` sizes) $ throwError SIZE
        ts <- liftIO getSystemTime
        -- TODO validate body empty
        sId <- ExceptT $ addFileRetry st file 3 ts
@@ -480,7 +452,7 @@ processXFTPRequest HTTP2Body {bodyPart} = \case
                pure $ FRErr e
          receiveChunk spec = do
            t <- asks $ fileTimeout . config
-            liftIO $ fromMaybe (Left TIMEOUT) <$> timeout t (runExceptT $ receiveFile getBody spec)
+            liftIO $ fromMaybe (Left TIMEOUT) <$> timeout t (runExceptT (receiveFile getBody spec) `catchAll_` pure (Left FILE_IO))
    sendServerFile :: FileRec -> RcvPublicDhKey -> M (FileResponse, Maybe ServerFile)
    sendServerFile FileRec {senderId, filePath, fileInfo = FileInfo {size}} rDhKey = do
      readTVarIO filePath >>= \case
@@ -25,7 +25,6 @@ import Simplex.FileTransfer.Protocol (FileCmd, FileInfo (..), XFTPFileId)
 import Simplex.FileTransfer.Server.Stats
 import Simplex.FileTransfer.Server.Store
 import Simplex.FileTransfer.Server.StoreLog
-import Simplex.FileTransfer.Transport (VersionRangeXFTP)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Protocol (BasicAuth, RcvPublicAuthKey)
 import Simplex.Messaging.Server.Expiration
@@ -62,15 +61,12 @@ data XFTPServerConfig = XFTPServerConfig
    caCertificateFile :: FilePath,
    privateKeyFile :: FilePath,
    certificateFile :: FilePath,
-    -- | XFTP client-server protocol version range
-    xftpServerVRange :: VersionRangeXFTP,
    -- stats config - see SMP server config
    logStatsInterval :: Maybe Int64,
    logStatsStartTime :: Int64,
    serverStatsLogFile :: FilePath,
    serverStatsBackupFile :: Maybe FilePath,
-    transportConfig :: TransportServerConfig,
-    responseDelay :: Int
+    transportConfig :: TransportServerConfig
  }

 defaultInactiveClientExpiration :: ExpirationConfig
@@ -7,20 +7,19 @@

 module Simplex.FileTransfer.Server.Main where

+import qualified Data.ByteString.Char8 as B
 import Data.Either (fromRight)
 import Data.Functor (($>))
 import Data.Ini (lookupValue, readIniFile)
 import Data.Int (Int64)
 import Data.Maybe (fromMaybe)
 import qualified Data.Text as T
-import qualified Data.Text.IO as T
 import Network.Socket (HostName)
 import Options.Applicative
 import Simplex.FileTransfer.Chunks
 import Simplex.FileTransfer.Description (FileSize (..))
 import Simplex.FileTransfer.Server (runXFTPServer)
 import Simplex.FileTransfer.Server.Env (XFTPServerConfig (..), defFileExpirationHours, defaultFileExpiration, defaultInactiveClientExpiration, supportedXFTPhandshakes)
-import Simplex.FileTransfer.Transport (supportedFileServerVRange)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Protocol (ProtoServerWithAuth (..), pattern XFTPServer)
@@ -29,7 +28,6 @@ import Simplex.Messaging.Server.Expiration
 import Simplex.Messaging.Transport (simplexMQVersion)
 import Simplex.Messaging.Transport.Client (TransportHost (..))
 import Simplex.Messaging.Transport.Server (TransportServerConfig (..), defaultTransportServerConfig)
-import Simplex.Messaging.Util (safeDecodeUtf8, tshow)
 import System.Directory (createDirectoryIfMissing, doesFileExist)
 import System.FilePath (combine)
 import System.IO (BufferMode (..), hSetBuffering, stderr, stdout)
@@ -70,7 +68,7 @@ xftpServerCLI cfgPath logPath = do
      fp <- createServerX509 cfgPath x509cfg
      let host = fromMaybe (if ip == "127.0.0.1" then "<hostnames>" else ip) fqdn
          srv = ProtoServerWithAuth (XFTPServer [THDomainName host] "" (C.KeyHash fp)) Nothing
-      T.writeFile iniFile $ iniFileContent host
+      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
@@ -84,7 +82,7 @@ xftpServerCLI cfgPath logPath = do
          \# Log is compacted on start (deleted objects are removed).\n"
            <> ("enable: " <> onOff enableStoreLog <> "\n\n")
            <> "# Expire files after the specified number of hours.\n"
-            <> ("expire_files_hours: " <> tshow defFileExpirationHours <> "\n\n")
+            <> ("expire_files_hours: " <> show defFileExpirationHours <> "\n\n")
            <> "log_stats: off\n\
               \\n\
               \[AUTH]\n\
@@ -103,20 +101,20 @@ xftpServerCLI cfgPath logPath = do
               \# control_port_user_password:\n\
               \[TRANSPORT]\n\
               \# host is only used to print server address on start\n"
-            <> ("host: " <> T.pack host <> "\n")
-            <> ("port: " <> T.pack defaultServerPort <> "\n")
+            <> ("host: " <> host <> "\n")
+            <> ("port: " <> defaultServerPort <> "\n")
            <> "log_tls_errors: off\n\
               \# control_port: 5226\n\
               \\n\
               \[FILES]\n"
-            <> ("path: " <> T.pack filesPath <> "\n")
-            <> ("storage_quota: " <> safeDecodeUtf8 (strEncode fileSizeQuota) <> "\n")
+            <> ("path: " <> filesPath <> "\n")
+            <> ("storage_quota: " <> B.unpack (strEncode fileSizeQuota) <> "\n")
            <> "\n\
               \[INACTIVE_CLIENTS]\n\
               \# TTL and interval to check inactive clients\n\
               \disconnect: off\n"
-            <> ("# ttl: " <> tshow (ttl defaultInactiveClientExpiration) <> "\n")
-            <> ("# check_interval: " <> tshow (checkInterval defaultInactiveClientExpiration) <> "\n")
+            <> ("# ttl: " <> show (ttl defaultInactiveClientExpiration) <> "\n")
+            <> ("# check_interval: " <> show (checkInterval defaultInactiveClientExpiration) <> "\n")
    runServer ini = do
      hSetBuffering stdout LineBuffering
      hSetBuffering stderr LineBuffering
@@ -166,7 +164,7 @@ xftpServerCLI cfgPath logPath = do
                  defaultFileExpiration
                    { ttl = 3600 * readIniDefault defFileExpirationHours "STORE_LOG" "expire_files_hours" ini
                    },
-              fileTimeout = 5 * 60 * 1000000, -- 5 mins to send 4mb chunk
+              fileTimeout = 10 * 60 * 1000000, -- 10 mins to send 4mb chunk
              inactiveClientExpiration =
                settingIsOn "INACTIVE_CLIENTS" "disconnect" ini
                  $> ExpirationConfig
@@ -176,7 +174,6 @@ xftpServerCLI cfgPath logPath = do
              caCertificateFile = c caCrtFile,
              privateKeyFile = c serverKeyFile,
              certificateFile = c serverCrtFile,
-              xftpServerVRange = supportedFileServerVRange,
              logStatsInterval = logStats $> 86400, -- seconds
              logStatsStartTime = 0, -- seconds from 00:00 UTC
              serverStatsLogFile = combine logPath "file-server-stats.daily.log",
@@ -185,8 +182,7 @@ xftpServerCLI cfgPath logPath = do
                defaultTransportServerConfig
                  { logTLSErrors = fromMaybe False $ iniOnOff "TRANSPORT" "log_tls_errors" ini,
                    alpn = Just supportedXFTPhandshakes
-                  },
-              responseDelay = 0
+                  }
            }

 data CliCommand
@@ -34,11 +34,9 @@ where

 import Control.Applicative ((<|>))
 import qualified Control.Exception as E
-import Control.Logger.Simple
 import Control.Monad
 import Control.Monad.Except
 import Control.Monad.IO.Class
-import Control.Monad.Trans.Except
 import qualified Data.Aeson.TH as J
 import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.Bifunctor (bimap, first)
@@ -47,19 +45,17 @@ import Data.ByteString.Builder (Builder, byteString)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import qualified Data.ByteString.Lazy.Char8 as LB
-import Data.Functor (($>))
 import Data.Word (Word16, Word32)
 import qualified Data.X509 as X
-import Network.HTTP2.Client (HTTP2Error)
 import qualified Simplex.Messaging.Crypto as C
 import qualified Simplex.Messaging.Crypto.Lazy as LC
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers
 import Simplex.Messaging.Protocol (CommandError)
-import Simplex.Messaging.Transport (SessionId, THandle (..), THandleParams (..), TransportError (..), TransportPeer (..))
+import Simplex.Messaging.Transport (HandshakeError (..), SessionId, THandle (..), THandleParams (..), TransportError (..), TransportPeer (..))
 import Simplex.Messaging.Transport.HTTP2.File
-import Simplex.Messaging.Util (bshow, tshow)
+import Simplex.Messaging.Util (bshow)
 import Simplex.Messaging.Version
 import Simplex.Messaging.Version.Internal
 import System.IO (Handle, IOMode (..), withFile)
@@ -99,7 +95,7 @@ supportedFileServerVRange = mkVersionRange initialXFTPVersion currentXFTPVersion

 -- XFTP protocol does not use this handshake method
 xftpClientHandshakeStub :: c -> Maybe C.KeyPairX25519 -> C.KeyHash -> VersionRangeXFTP -> ExceptT TransportError IO (THandle XFTPVersion c 'TClient)
-xftpClientHandshakeStub _c _ks _keyHash _xftpVRange = throwE TEVersion
+xftpClientHandshakeStub _c _ks _keyHash _xftpVRange = throwError $ TEHandshake VERSION

 data XFTPServerHandshake = XFTPServerHandshake
  { xftpVersionRange :: VersionRangeXFTP,
@@ -148,14 +144,9 @@ sendEncFile h send = go
        go sbState' $ sz - fromIntegral (B.length ch)

 receiveFile :: (Int -> IO ByteString) -> XFTPRcvChunkSpec -> ExceptT XFTPErrorType IO ()
-receiveFile getBody chunk = ExceptT $ runExceptT (receiveFile_ receive chunk) `E.catches` handlers
+receiveFile getBody = receiveFile_ receive
  where
    receive h sz = hReceiveFile getBody h sz >>= \sz' -> pure $ if sz' == 0 then Right () else Left SIZE
-    handlers =
-      [ E.Handler $ \(e :: HTTP2Error) -> logWarn (err e) $> Left TIMEOUT,
-        E.Handler $ \(e :: E.SomeException) -> logError (err e) $> Left FILE_IO
-      ]
-    err e = "receiveFile error: " <> tshow e

 receiveEncFile :: (Int -> IO ByteString) -> LC.SbState -> XFTPRcvChunkSpec -> ExceptT XFTPErrorType IO ()
 receiveEncFile getBody = receiveFile_ . receive
@@ -194,7 +185,7 @@ receiveFile_ :: (Handle -> Word32 -> IO (Either XFTPErrorType ())) -> XFTPRcvChu
 receiveFile_ receive XFTPRcvChunkSpec {filePath, chunkSize, chunkDigest} = do
  ExceptT $ withFile filePath WriteMode (`receive` chunkSize)
  digest' <- liftIO $ LC.sha256Hash <$> LB.readFile filePath
-  when (digest' /= chunkDigest) $ throwE DIGEST
+  when (digest' /= chunkDigest) $ throwError DIGEST

 data XFTPErrorType
  = -- | incorrect block format, encoding or signature size
@@ -221,8 +212,10 @@ data XFTPErrorType
    HAS_FILE
  | -- | file IO error
    FILE_IO
-  | -- | file sending or receiving timeout
+  | -- | file sending timeout
    TIMEOUT
+  | -- | bad redirect data
+    REDIRECT {redirectError :: String}
  | -- | internal server error
    INTERNAL
  | -- | used internally, never returned by the server (to be removed)
@@ -232,9 +225,11 @@ data XFTPErrorType
 instance StrEncoding XFTPErrorType where
  strEncode = \case
    CMD e -> "CMD " <> bshow e
+    REDIRECT e -> "REDIRECT " <> bshow e
    e -> bshow e
  strP =
    "CMD " *> (CMD <$> parseRead1)
+      <|> "REDIRECT " *> (REDIRECT <$> parseRead A.takeByteString)
      <|> parseRead1

 instance Encoding XFTPErrorType where
@@ -252,6 +247,7 @@ instance Encoding XFTPErrorType where
    HAS_FILE -> "HAS_FILE"
    FILE_IO -> "FILE_IO"
    TIMEOUT -> "TIMEOUT"
+    REDIRECT err -> "REDIRECT " <> smpEncode err
    INTERNAL -> "INTERNAL"
    DUPLICATE_ -> "DUPLICATE_"

@@ -270,6 +266,7 @@ instance Encoding XFTPErrorType where
      "HAS_FILE" -> pure HAS_FILE
      "FILE_IO" -> pure FILE_IO
      "TIMEOUT" -> pure TIMEOUT
+      "REDIRECT" -> REDIRECT <$> _smpP
      "INTERNAL" -> pure INTERNAL
      "DUPLICATE_" -> pure DUPLICATE_
      _ -> fail "bad error type"
@@ -2,33 +2,24 @@
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE TemplateHaskell #-}

 module Simplex.FileTransfer.Types where

-import qualified Data.Aeson.TH as J
-import qualified Data.Attoparsec.ByteString.Char8 as A
-import Data.ByteString.Char8 (ByteString)
 import Data.Int (Int64)
-import qualified Data.Text as T
-import Data.Text.Encoding (encodeUtf8)
 import Data.Word (Word32)
 import Database.SQLite.Simple.FromField (FromField (..))
 import Database.SQLite.Simple.ToField (ToField (..))
 import Simplex.FileTransfer.Client (XFTPChunkSpec (..))
 import Simplex.FileTransfer.Description
+import Simplex.Messaging.Agent.Protocol (RcvFileId, SndFileId)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Crypto.File (CryptoFile (..))
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Parsers
-import Simplex.Messaging.Protocol (XFTPServer)
+import Simplex.Messaging.Parsers (fromTextField_)
+import Simplex.Messaging.Protocol
 import System.FilePath ((</>))

-type RcvFileId = ByteString
-
-type SndFileId = ByteString
-
 authTagSize :: Int64
 authTagSize = fromIntegral C.authTagSize

@@ -245,35 +236,3 @@ data DeletedSndChunkReplica = DeletedSndChunkReplica
    retries :: Int
  }
  deriving (Show)
-
-data FileErrorType
-  = -- | cannot proceed with download from not approved relays without proxy
-    NOT_APPROVED
-  | -- | max file size exceeded
-    SIZE
-  | -- | bad redirect data
-    REDIRECT {redirectError :: String}
-  | -- | file crypto error
-    FILE_IO {fileIOError :: String}
-  | -- | file not found or was deleted
-    NO_FILE
-  deriving (Eq, Show)
-
-instance StrEncoding FileErrorType where
-  strP =
-    A.takeTill (== ' ')
-      >>= \case
-        "NOT_APPROVED" -> pure NOT_APPROVED
-        "SIZE" -> pure SIZE
-        "REDIRECT" -> REDIRECT <$> (A.space *> textP)
-        "FILE_IO" -> FILE_IO <$> (A.space *> textP)
-        "NO_FILE" -> pure NO_FILE
-        _ -> fail "bad FileErrorType"
-  strEncode = \case
-    NOT_APPROVED -> "NOT_APPROVED"
-    SIZE -> "SIZE"
-    REDIRECT e -> "REDIRECT " <> encodeUtf8 (T.pack e)
-    FILE_IO e -> "FILE_IO " <> encodeUtf8 (T.pack e)
-    NO_FILE -> "NO_FILE"
-
-$(J.deriveJSON (sumTypeJSON id) ''FileErrorType)
@@ -54,6 +54,7 @@ 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.Crypto.Ratchet (VersionRangeE2E, supportedE2EEncryptVRange)
 import Simplex.Messaging.Notifications.Client (defaultNTFClientConfig)
@@ -91,20 +92,20 @@ data AgentConfig = AgentConfig
    xftpCfg :: XFTPClientConfig,
    reconnectInterval :: RetryInterval,
    messageRetryInterval :: RetryInterval2,
-    userNetworkInterval :: Int,
-    userOfflineDelay :: NominalDiffTime,
+    userNetworkInterval :: RetryInterval,
    messageTimeout :: NominalDiffTime,
    connDeleteDeliveryTimeout :: NominalDiffTime,
    helloTimeout :: NominalDiffTime,
    quotaExceededTimeout :: NominalDiffTime,
-    persistErrorInterval :: NominalDiffTime,
    initialCleanupDelay :: Int64,
    cleanupInterval :: Int64,
    cleanupStepInterval :: Int,
    maxWorkerRestartsPerMin :: Int,
+    maxSubscriptionTimeouts :: Int,
    storedMsgDataTTL :: NominalDiffTime,
    rcvFilesTTL :: NominalDiffTime,
    sndFilesTTL :: NominalDiffTime,
+    xftpNotifyErrsOnRetry :: Bool,
    xftpConsecutiveRetries :: Int,
    xftpMaxRecipientsPerRequest :: Int,
    deleteErrorCount :: Int,
@@ -146,6 +147,14 @@ defaultMessageRetryInterval =
          }
    }

+defaultUserNetworkInterval :: RetryInterval
+defaultUserNetworkInterval =
+  RetryInterval
+    { initialInterval = 1200_000000, -- 20 minutes
+      increaseAfter = 0,
+      maxInterval = 7200_000000 -- 2 hours
+    }
+
 defaultAgentConfig :: AgentConfig
 defaultAgentConfig =
  AgentConfig
@@ -161,20 +170,22 @@ defaultAgentConfig =
      xftpCfg = defaultXFTPClientConfig,
      reconnectInterval = defaultReconnectInterval,
      messageRetryInterval = defaultMessageRetryInterval,
-      userNetworkInterval = 1800_000000, -- 30 minutes, should be less than Int32 max value
-      userOfflineDelay = 2, -- if network offline event happens in less than 2 seconds after it was set online, it is ignored
+      userNetworkInterval = defaultUserNetworkInterval,
      messageTimeout = 2 * nominalDay,
      connDeleteDeliveryTimeout = 2 * nominalDay,
      helloTimeout = 2 * nominalDay,
      quotaExceededTimeout = 7 * nominalDay,
-      persistErrorInterval = 3, -- seconds
      initialCleanupDelay = 30 * 1000000, -- 30 seconds
      cleanupInterval = 30 * 60 * 1000000, -- 30 minutes
      cleanupStepInterval = 200000, -- 200ms
      maxWorkerRestartsPerMin = 5,
+      -- 3 consecutive subscription timeouts will result in alert to the user
+      -- this is a fallback, as the timeout set to 3x of expected timeout, to avoid potential locking.
+      maxSubscriptionTimeouts = 5,
      storedMsgDataTTL = 21 * nominalDay,
      rcvFilesTTL = 2 * nominalDay,
      sndFilesTTL = nominalDay,
+      xftpNotifyErrsOnRetry = True,
      xftpConsecutiveRetries = 3,
      xftpMaxRecipientsPerRequest = 200,
      deleteErrorCount = 10,
@@ -12,8 +12,6 @@ import Control.Monad (void)
 import Control.Monad.Except (ExceptT (..), runExceptT)
 import Control.Monad.IO.Unlift
 import Data.Functor (($>))
-import Data.Set (Set)
-import qualified Data.Set as S
 import UnliftIO.Async (forConcurrently)
 import qualified UnliftIO.Exception as E
 import UnliftIO.STM
@@ -41,11 +39,13 @@ withGetLock getLock key name a =
    (atomically . takeTMVar)
    (const a)

-withGetLocks :: MonadUnliftIO m => (k -> STM Lock) -> Set k -> String -> m a -> m a
+withGetLocks :: MonadUnliftIO m => (k -> STM Lock) -> [k] -> String -> m a -> m a
 withGetLocks getLock keys name = E.bracket holdLocks releaseLocks . const
  where
-    holdLocks = forConcurrently (S.toList keys) $ \key -> atomically $ getPutLock getLock key name
-    releaseLocks = mapM_ (atomically . takeTMVar)
+    holdLocks = forConcurrently keys $ \key -> atomically $ getPutLock getLock key name
+    -- only this withGetLocks would be holding the locks,
+    -- so it's safe to combine all lock releases into one transaction
+    releaseLocks = atomically . mapM_ takeTMVar

 -- getLock and putTMVar can be in one transaction on the assumption that getLock doesn't write in case the lock already exists,
 -- and in case it is created and added to some shared resource (we use TMap) it also helps avoid contention for the newly created lock.
@@ -29,10 +29,11 @@ import Data.Time (UTCTime, addUTCTime, getCurrentTime)
 import Data.Time.Clock (diffUTCTime)
 import Simplex.Messaging.Agent.Client
 import Simplex.Messaging.Agent.Env.SQLite
-import Simplex.Messaging.Agent.Protocol (AEvent (..), AEvt (..), AgentErrorType (..), BrokerErrorType (..), ConnId, NotificationsMode (..), SAEntity (..))
+import Simplex.Messaging.Agent.Protocol (ACommand (..), APartyCmd (..), AgentErrorType (..), BrokerErrorType (..), ConnId, NotificationsMode (..), SAEntity (..))
 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
@@ -160,7 +161,7 @@ runNtfWorker c srv Worker {doWork} = do
          logInfo $ "runNtfWorker, nextSub " <> tshow nextSub
          ri <- asks $ reconnectInterval . config
          withRetryInterval ri $ \_ loop -> do
-            liftIO $ waitForUserNetwork c
+            lift $ waitForUserNetwork c
            processSub nextSub
              `catchAgentError` retryOnError c "NtfWorker" loop (workerInternalError c connId . show)
    processSub :: (NtfSubscription, NtfSubNTFAction, NtfActionTs) -> AM ()
@@ -244,7 +245,7 @@ runNtfSMPWorker c srv Worker {doWork} = do
          logInfo $ "runNtfSMPWorker, nextSub " <> tshow nextSub
          ri <- asks $ reconnectInterval . config
          withRetryInterval ri $ \_ loop -> do
-            liftIO $ waitForUserNetwork c
+            lift $ waitForUserNetwork c
            processSub nextSub
              `catchAgentError` retryOnError c "NtfSMPWorker" loop (workerInternalError c connId . show)
    processSub :: (NtfSubscription, NtfSubSMPAction, NtfActionTs) -> AM ()
@@ -306,7 +307,7 @@ workerInternalError c connId internalErrStr = do

 -- TODO change error
 notifyInternalError :: MonadIO m => AgentClient -> ConnId -> String -> m ()
-notifyInternalError AgentClient {subQ} connId internalErrStr = atomically $ writeTBQueue subQ ("", connId, AEvt SAEConn $ ERR $ INTERNAL internalErrStr)
+notifyInternalError AgentClient {subQ} connId internalErrStr = atomically $ writeTBQueue subQ ("", connId, APC SAEConn $ ERR $ INTERNAL internalErrStr)
 {-# INLINE notifyInternalError #-}

 getNtfToken :: AM' (Maybe NtfToken)
@@ -0,0 +1,85 @@
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module Simplex.Messaging.Agent.Server
+  ( -- * SMP agent over TCP
+    runSMPAgent,
+    runSMPAgentBlocking,
+  )
+where
+
+import Control.Logger.Simple (logInfo)
+import Control.Monad
+import Control.Monad.Reader
+import Data.ByteString.Char8 (ByteString)
+import qualified Data.ByteString.Char8 as B
+import Data.Text.Encoding (decodeUtf8)
+import Network.Socket (ServiceName)
+import Simplex.Messaging.Agent
+import Simplex.Messaging.Agent.Client (newAgentClient)
+import Simplex.Messaging.Agent.Env.SQLite
+import Simplex.Messaging.Agent.Protocol
+import Simplex.Messaging.Agent.Store.SQLite (SQLiteStore)
+import Simplex.Messaging.Transport (ATransport (..), TProxy, Transport (..), simplexMQVersion)
+import Simplex.Messaging.Transport.Server (defaultTransportServerConfig, loadTLSServerParams, runTransportServer)
+import Simplex.Messaging.Util (bshow)
+import UnliftIO.Async (race_)
+import qualified UnliftIO.Exception as E
+import UnliftIO.STM
+
+-- | Runs an SMP agent as a TCP service using passed configuration.
+--
+-- See a full agent executable here: https://github.com/simplex-chat/simplexmq/blob/master/apps/smp-agent/Main.hs
+runSMPAgent :: ATransport -> AgentConfig -> InitialAgentServers -> SQLiteStore -> IO ()
+runSMPAgent t cfg initServers store =
+  runSMPAgentBlocking t cfg initServers store 0 =<< newEmptyTMVarIO
+
+-- | Runs an SMP agent as a TCP service using passed configuration with signalling.
+--
+-- 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).
+runSMPAgentBlocking :: ATransport -> AgentConfig -> InitialAgentServers -> SQLiteStore -> Int -> TMVar Bool -> IO ()
+runSMPAgentBlocking (ATransport t) cfg@AgentConfig {tcpPort, caCertificateFile, certificateFile, privateKeyFile} initServers store initClientId started =
+  case tcpPort of
+    Just port -> newSMPAgentEnv cfg store >>= smpAgent t port
+    Nothing -> E.throwIO $ userError "no agent port"
+  where
+    smpAgent :: forall c. Transport c => TProxy c -> ServiceName -> Env -> IO ()
+    smpAgent _ port env = do
+      -- tlsServerParams is not in Env to avoid breaking functional API w/t key and certificate generation
+      tlsServerParams <- loadTLSServerParams caCertificateFile certificateFile privateKeyFile Nothing
+      clientId <- newTVarIO initClientId
+      runTransportServer started port tlsServerParams defaultTransportServerConfig $ \(h :: c) -> do
+        putLn h $ "Welcome to SMP agent v" <> B.pack simplexMQVersion
+        cId <- atomically $ stateTVar clientId $ \i -> (i + 1, i + 1)
+        c <- atomically $ newAgentClient cId initServers env
+        logConnection c True
+        race_ (connectClient h c) (runAgentClient c `runReaderT` env)
+          `E.finally` (disconnectAgentClient c)
+
+connectClient :: Transport c => c -> AgentClient -> IO ()
+connectClient h c = race_ (send h c) (receive h c)
+
+receive :: forall c. Transport c => c -> AgentClient -> IO ()
+receive h c@AgentClient {rcvQ, subQ} = forever $ do
+  (corrId, entId, cmdOrErr) <- tGet SClient h
+  case cmdOrErr of
+    Right cmd -> write rcvQ (corrId, entId, cmd)
+    Left e -> write subQ (corrId, entId, APC SAEConn $ ERR e)
+  where
+    write :: TBQueue (ATransmission p) -> ATransmission p -> IO ()
+    write q t = do
+      logClient c "-->" t
+      atomically $ writeTBQueue q t
+
+send :: Transport c => c -> AgentClient -> IO ()
+send h c@AgentClient {subQ} = forever $ do
+  t <- atomically $ readTBQueue subQ
+  tPut h t
+  logClient c "<--" t
+
+logClient :: AgentClient -> ByteString -> ATransmission a -> IO ()
+logClient AgentClient {clientId} dir (corrId, connId, APC _ cmd) = do
+  logInfo . decodeUtf8 $ B.unwords [bshow clientId, dir, "A :", corrId, connId, B.takeWhile (/= ' ') $ serializeCommand cmd]
@@ -30,7 +30,7 @@ import Data.Type.Equality
 import Simplex.Messaging.Agent.Protocol
 import Simplex.Messaging.Agent.RetryInterval (RI2State)
 import qualified Simplex.Messaging.Crypto as C
-import Simplex.Messaging.Crypto.Ratchet (PQEncryption, PQSupport, RatchetX448)
+import Simplex.Messaging.Crypto.Ratchet (RatchetX448, PQEncryption, PQSupport)
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Protocol
  ( MsgBody,
@@ -47,6 +47,7 @@ import Simplex.Messaging.Protocol
    VersionSMPC,
  )
 import qualified Simplex.Messaging.Protocol as SMP
+import Simplex.Messaging.Util ((<$?>))

 -- * Queue types

@@ -343,20 +344,20 @@ instance StrEncoding AgentCmdType where
      _ -> fail "bad AgentCmdType"

 data AgentCommand
-  = AClientCommand ACommand
+  = AClientCommand (APartyCmd 'Client)
  | AInternalCommand InternalCommand

 instance StrEncoding AgentCommand where
  strEncode = \case
-    AClientCommand cmd -> strEncode (ACClient, Str $ serializeCommand cmd)
+    AClientCommand (APC _ cmd) -> strEncode (ACClient, Str $ serializeCommand cmd)
    AInternalCommand cmd -> strEncode (ACInternal, cmd)
  strP =
    strP_ >>= \case
-      ACClient -> AClientCommand <$> dbCommandP
+      ACClient -> AClientCommand <$> ((\(ACmd _ e cmd) -> checkParty $ APC e cmd) <$?> dbCommandP)
      ACInternal -> AInternalCommand <$> strP

 data AgentCommandTag
-  = AClientCommandTag ACommandTag
+  = AClientCommandTag (APartyCmdTag 'Client)
  | AInternalCommandTag InternalCommandTag
  deriving (Show)

@@ -435,7 +436,7 @@ instance StrEncoding InternalCommandTag where

 agentCommandTag :: AgentCommand -> AgentCommandTag
 agentCommandTag = \case
-  AClientCommand cmd -> AClientCommandTag $ aCommandTag cmd
+  AClientCommand cmd -> AClientCommandTag $ aPartyCmdTag cmd
  AInternalCommand cmd -> AInternalCommandTag $ internalCmdTag cmd

 internalCmdTag :: InternalCommand -> InternalCommandTag
@@ -592,8 +593,6 @@ type AsyncCmdId = Int64
 data StoreError
  = -- | IO exceptions in store actions.
    SEInternal ByteString
-  | -- | Database busy
-    SEDatabaseBusy ByteString
  | -- | Failed to generate unique random ID
    SEUniqueID
  | -- | User ID not found
@@ -221,11 +221,9 @@ module Simplex.Messaging.Agent.Store.SQLite
  )
 where

-import Control.Logger.Simple
 import Control.Monad
 import Control.Monad.Except
 import Control.Monad.IO.Class
-import Control.Monad.Trans.Except
 import Crypto.Random (ChaChaDRG)
 import qualified Data.Aeson.TH as J
 import qualified Data.Attoparsec.ByteString.Char8 as A
@@ -270,7 +268,7 @@ import Simplex.Messaging.Agent.Store.SQLite.Migrations (DownMigration (..), MTRE
 import qualified Simplex.Messaging.Agent.Store.SQLite.Migrations as Migrations
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Crypto.File (CryptoFile (..), CryptoFileArgs (..))
-import Simplex.Messaging.Crypto.Ratchet (PQEncryption (..), PQSupport (..), RatchetX448, SkippedMsgDiff (..), SkippedMsgKeys)
+import Simplex.Messaging.Crypto.Ratchet (RatchetX448, SkippedMsgDiff (..), SkippedMsgKeys, PQEncryption (..), PQSupport (..))
 import qualified Simplex.Messaging.Crypto.Ratchet as CR
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
@@ -280,7 +278,7 @@ import Simplex.Messaging.Parsers (blobFieldParser, defaultJSON, dropPrefix, from
 import Simplex.Messaging.Protocol
 import qualified Simplex.Messaging.Protocol as SMP
 import Simplex.Messaging.Transport.Client (TransportHost)
-import Simplex.Messaging.Util (bshow, catchAllErrors, eitherToMaybe, ifM, safeDecodeUtf8, tshow, ($>>=), (<$$>))
+import Simplex.Messaging.Util (bshow, catchAllErrors, eitherToMaybe, ifM, safeDecodeUtf8, ($>>=), (<$$>))
 import Simplex.Messaging.Version.Internal
 import System.Directory (copyFile, createDirectoryIfMissing, doesFileExist)
 import System.Exit (exitFailure)
@@ -288,7 +286,6 @@ import System.FilePath (takeDirectory)
 import System.IO (hFlush, stdout)
 import UnliftIO.Exception (bracketOnError, onException)
 import qualified UnliftIO.Exception as E
-import UnliftIO.MVar
 import UnliftIO.STM

 -- * SQLite Store implementation
@@ -384,8 +381,8 @@ connectSQLiteStore :: FilePath -> ScrubbedBytes -> Bool -> IO SQLiteStore
 connectSQLiteStore dbFilePath key keepKey = do
  dbNew <- not <$> doesFileExist dbFilePath
  dbConn <- dbBusyLoop (connectDB dbFilePath key)
-  dbConnection <- newMVar dbConn
  atomically $ do
+    dbConnection <- newTMVar dbConn
    dbKey <- newTVar $! storeKey key keepKey
    dbClosed <- newTVar False
    pure SQLiteStore {dbFilePath, dbKey, dbConnection, dbNew, dbClosed}
@@ -423,14 +420,14 @@ openSQLiteStore st@SQLiteStore {dbClosed} key keepKey =
 openSQLiteStore_ :: SQLiteStore -> ScrubbedBytes -> Bool -> IO ()
 openSQLiteStore_ SQLiteStore {dbConnection, dbFilePath, dbKey, dbClosed} key keepKey =
  bracketOnError
-    (takeMVar dbConnection)
-    (tryPutMVar dbConnection)
+    (atomically $ takeTMVar dbConnection)
+    (atomically . tryPutTMVar dbConnection)
    $ \DB.Connection {slow} -> do
      DB.Connection {conn} <- connectDB dbFilePath key
      atomically $ do
+        putTMVar dbConnection DB.Connection {conn, slow}
        writeTVar dbClosed False
        writeTVar dbKey $! storeKey key keepKey
-      putMVar dbConnection DB.Connection {conn, slow}

 reopenSQLiteStore :: SQLiteStore -> IO ()
 reopenSQLiteStore st@SQLiteStore {dbKey, dbClosed} =
@@ -1046,7 +1043,7 @@ getWorkItem :: Show i => ByteString -> IO (Maybe i) -> (i -> IO (Either StoreErr
 getWorkItem itemName getId getItem markFailed =
  runExceptT $ handleErr "getId" getId >>= mapM tryGetItem
  where
-    tryGetItem itemId = ExceptT (getItem itemId) `catchStoreErrors` \e -> mark itemId >> throwE e
+    tryGetItem itemId = ExceptT (getItem itemId) `catchStoreErrors` \e -> mark itemId >> throwError e
    mark itemId = handleErr ("markFailed ID " <> bshow itemId) $ markFailed itemId
    catchStoreErrors = catchAllErrors (SEInternal . bshow)
    -- Errors caught by this function will suspend worker as if there is no more work,
@@ -1275,16 +1272,12 @@ createCommand :: DB.Connection -> ACorrId -> ConnId -> Maybe SMPServer -> AgentC
 createCommand db corrId connId srv_ cmd = runExceptT $ do
  (host_, port_, serverKeyHash_) <- serverFields
  createdAt <- liftIO getCurrentTime
-  liftIO . E.handle handleErr $
+  liftIO $
    DB.execute
      db
      "INSERT INTO commands (host, port, corr_id, conn_id, command_tag, command, server_key_hash, created_at) VALUES (?,?,?,?,?,?,?,?)"
-      (host_, port_, corrId, connId, cmdTag, cmd, serverKeyHash_, createdAt)
+      (host_, port_, corrId, connId, agentCommandTag cmd, cmd, serverKeyHash_, createdAt)
  where
-    cmdTag = agentCommandTag cmd
-    handleErr e
-      | SQL.sqlError e == SQL.ErrorConstraint = logError $ "tried to create command " <> tshow cmdTag <> " for deleted connection"
-      | otherwise = E.throwIO e
    serverFields :: ExceptT StoreError IO (Maybe (NonEmpty TransportHost), Maybe ServiceName, Maybe C.KeyHash)
    serverFields = case srv_ of
      Just srv@(SMPServer host port _) ->
@@ -2276,20 +2269,20 @@ getXFTPServerId_ db ProtocolServer {host, port, keyHash} = do
  firstRow fromOnly SEXFTPServerNotFound $
    DB.query db "SELECT xftp_server_id FROM xftp_servers WHERE xftp_host = ? AND xftp_port = ? AND xftp_key_hash = ?" (host, port, keyHash)

-createRcvFile :: DB.Connection -> TVar ChaChaDRG -> UserId -> FileDescription 'FRecipient -> FilePath -> FilePath -> CryptoFile -> Bool -> IO (Either StoreError RcvFileId)
-createRcvFile db gVar userId fd@FileDescription {chunks} prefixPath tmpPath file approvedRelays = runExceptT $ do
-  (rcvFileEntityId, rcvFileId) <- ExceptT $ insertRcvFile db gVar userId fd prefixPath tmpPath file Nothing Nothing approvedRelays
+createRcvFile :: DB.Connection -> TVar ChaChaDRG -> UserId -> FileDescription 'FRecipient -> FilePath -> FilePath -> CryptoFile -> IO (Either StoreError RcvFileId)
+createRcvFile db gVar userId fd@FileDescription {chunks} prefixPath tmpPath file = runExceptT $ do
+  (rcvFileEntityId, rcvFileId) <- ExceptT $ insertRcvFile db gVar userId fd prefixPath tmpPath file Nothing Nothing
  liftIO $
    forM_ chunks $ \fc@FileChunk {replicas} -> do
      chunkId <- insertRcvFileChunk db fc rcvFileId
      forM_ (zip [1 ..] replicas) $ \(rno, replica) -> insertRcvFileChunkReplica db rno replica chunkId
  pure rcvFileEntityId

-createRcvFileRedirect :: DB.Connection -> TVar ChaChaDRG -> UserId -> FileDescription 'FRecipient -> FilePath -> FilePath -> CryptoFile -> FilePath -> CryptoFile -> Bool -> IO (Either StoreError RcvFileId)
-createRcvFileRedirect _ _ _ FileDescription {redirect = Nothing} _ _ _ _ _ _ = pure $ Left $ SEInternal "createRcvFileRedirect called without redirect"
-createRcvFileRedirect db gVar userId redirectFd@FileDescription {chunks = redirectChunks, redirect = Just RedirectFileInfo {size, digest}} prefixPath redirectPath redirectFile dstPath dstFile approvedRelays = runExceptT $ do
-  (dstEntityId, dstId) <- ExceptT $ insertRcvFile db gVar userId dummyDst prefixPath dstPath dstFile Nothing Nothing approvedRelays
-  (_, redirectId) <- ExceptT $ insertRcvFile db gVar userId redirectFd prefixPath redirectPath redirectFile (Just dstId) (Just dstEntityId) approvedRelays
+createRcvFileRedirect :: DB.Connection -> TVar ChaChaDRG -> UserId -> FileDescription FRecipient -> FilePath -> FilePath -> CryptoFile -> FilePath -> CryptoFile -> IO (Either StoreError RcvFileId)
+createRcvFileRedirect _ _ _ FileDescription {redirect = Nothing} _ _ _ _ _ = pure $ Left $ SEInternal "createRcvFileRedirect called without redirect"
+createRcvFileRedirect db gVar userId redirectFd@FileDescription {chunks = redirectChunks, redirect = Just RedirectFileInfo {size, digest}} prefixPath redirectPath redirectFile dstPath dstFile = runExceptT $ do
+  (dstEntityId, dstId) <- ExceptT $ insertRcvFile db gVar userId dummyDst prefixPath dstPath dstFile Nothing Nothing
+  (_, redirectId) <- ExceptT $ insertRcvFile db gVar userId redirectFd prefixPath redirectPath redirectFile (Just dstId) (Just dstEntityId)
  liftIO $
    forM_ redirectChunks $ \fc@FileChunk {replicas} -> do
      chunkId <- insertRcvFileChunk db fc redirectId
@@ -2309,8 +2302,8 @@ createRcvFileRedirect db gVar userId redirectFd@FileDescription {chunks = redire
          chunks = []
        }

-insertRcvFile :: DB.Connection -> TVar ChaChaDRG -> UserId -> FileDescription 'FRecipient -> FilePath -> FilePath -> CryptoFile -> Maybe DBRcvFileId -> Maybe RcvFileId -> Bool -> IO (Either StoreError (RcvFileId, DBRcvFileId))
-insertRcvFile db gVar userId FileDescription {size, digest, key, nonce, chunkSize, redirect} prefixPath tmpPath (CryptoFile savePath cfArgs) redirectId_ redirectEntityId_ approvedRelays = runExceptT $ do
+insertRcvFile :: DB.Connection -> TVar ChaChaDRG -> UserId -> FileDescription 'FRecipient -> FilePath -> FilePath -> CryptoFile -> Maybe DBRcvFileId -> Maybe RcvFileId -> IO (Either StoreError (RcvFileId, DBRcvFileId))
+insertRcvFile db gVar userId FileDescription {size, digest, key, nonce, chunkSize, redirect} prefixPath tmpPath (CryptoFile savePath cfArgs) redirectId_ redirectEntityId_ = runExceptT $ do
  let (redirectDigest_, redirectSize_) = case redirect of
        Just RedirectFileInfo {digest = d, size = s} -> (Just d, Just s)
        Nothing -> (Nothing, Nothing)
@@ -2318,8 +2311,8 @@ insertRcvFile db gVar userId FileDescription {size, digest, key, nonce, chunkSiz
    createWithRandomId gVar $ \rcvFileEntityId ->
      DB.execute
        db
-        "INSERT INTO rcv_files (rcv_file_entity_id, user_id, size, digest, key, nonce, chunk_size, prefix_path, tmp_path, save_path, save_file_key, save_file_nonce, status, redirect_id, redirect_entity_id, redirect_digest, redirect_size, approved_relays) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)"
-        ((rcvFileEntityId, userId, size, digest, key, nonce, chunkSize, prefixPath, tmpPath) :. (savePath, fileKey <$> cfArgs, fileNonce <$> cfArgs, RFSReceiving, redirectId_, redirectEntityId_, redirectDigest_, redirectSize_, approvedRelays))
+        "INSERT INTO rcv_files (rcv_file_entity_id, user_id, size, digest, key, nonce, chunk_size, prefix_path, tmp_path, save_path, save_file_key, save_file_nonce, status, redirect_id, redirect_entity_id, redirect_digest, redirect_size) VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)"
+        ((rcvFileEntityId, userId, size, digest, key, nonce, chunkSize, prefixPath, tmpPath) :. (savePath, fileKey <$> cfArgs, fileNonce <$> cfArgs, RFSReceiving, redirectId_, redirectEntityId_, redirectDigest_, redirectSize_))
  rcvFileId <- liftIO $ insertedRowId db
  pure (rcvFileEntityId, rcvFileId)

@@ -2469,7 +2462,7 @@ deleteRcvFile' :: DB.Connection -> DBRcvFileId -> IO ()
 deleteRcvFile' db rcvFileId =
  DB.execute db "DELETE FROM rcv_files WHERE rcv_file_id = ?" (Only rcvFileId)

-getNextRcvChunkToDownload :: DB.Connection -> XFTPServer -> NominalDiffTime -> IO (Either StoreError (Maybe (RcvFileChunk, Bool)))
+getNextRcvChunkToDownload :: DB.Connection -> XFTPServer -> NominalDiffTime -> IO (Either StoreError (Maybe RcvFileChunk))
 getNextRcvChunkToDownload db server@ProtocolServer {host, port, keyHash} ttl = do
  getWorkItem "rcv_file_download" getReplicaId getChunkData (markRcvFileFailed db . snd)
  where
@@ -2493,7 +2486,7 @@ getNextRcvChunkToDownload db server@ProtocolServer {host, port, keyHash} ttl = d
            LIMIT 1
          |]
          (host, port, keyHash, RFSReceiving, cutoffTs)
-    getChunkData :: (Int64, DBRcvFileId) -> IO (Either StoreError (RcvFileChunk, Bool))
+    getChunkData :: (Int64, DBRcvFileId) -> IO (Either StoreError RcvFileChunk)
    getChunkData (rcvFileChunkReplicaId, _fileId) =
      firstRow toChunk SEFileNotFound $
        DB.query
@@ -2501,8 +2494,7 @@ getNextRcvChunkToDownload db server@ProtocolServer {host, port, keyHash} ttl = d
          [sql|
            SELECT
              f.rcv_file_id, f.rcv_file_entity_id, f.user_id, c.rcv_file_chunk_id, c.chunk_no, c.chunk_size, c.digest, f.tmp_path, c.tmp_path,
-              r.rcv_file_chunk_replica_id, r.replica_id, r.replica_key, r.received, r.delay, r.retries,
-              f.approved_relays
+              r.rcv_file_chunk_replica_id, r.replica_id, r.replica_key, r.received, r.delay, r.retries
            FROM rcv_file_chunk_replicas r
            JOIN xftp_servers s ON s.xftp_server_id = r.xftp_server_id
            JOIN rcv_file_chunks c ON c.rcv_file_chunk_id = r.rcv_file_chunk_id
@@ -2511,22 +2503,20 @@ getNextRcvChunkToDownload db server@ProtocolServer {host, port, keyHash} ttl = d
          |]
          (Only rcvFileChunkReplicaId)
      where
-        toChunk :: ((DBRcvFileId, RcvFileId, UserId, Int64, Int, FileSize Word32, FileDigest, FilePath, Maybe FilePath) :. (Int64, ChunkReplicaId, C.APrivateAuthKey, Bool, Maybe Int64, Int) :. Only Bool) -> (RcvFileChunk, Bool)
-        toChunk ((rcvFileId, rcvFileEntityId, userId, rcvChunkId, chunkNo, chunkSize, digest, fileTmpPath, chunkTmpPath) :. (rcvChunkReplicaId, replicaId, replicaKey, received, delay, retries) :. (Only approvedRelays)) =
-          ( RcvFileChunk
-              { rcvFileId,
-                rcvFileEntityId,
-                userId,
-                rcvChunkId,
-                chunkNo,
-                chunkSize,
-                digest,
-                fileTmpPath,
-                chunkTmpPath,
-                replicas = [RcvFileChunkReplica {rcvChunkReplicaId, server, replicaId, replicaKey, received, delay, retries}]
-              },
-            approvedRelays
-          )
+        toChunk :: ((DBRcvFileId, RcvFileId, UserId, Int64, Int, FileSize Word32, FileDigest, FilePath, Maybe FilePath) :. (Int64, ChunkReplicaId, C.APrivateAuthKey, Bool, Maybe Int64, Int)) -> RcvFileChunk
+        toChunk ((rcvFileId, rcvFileEntityId, userId, rcvChunkId, chunkNo, chunkSize, digest, fileTmpPath, chunkTmpPath) :. (rcvChunkReplicaId, replicaId, replicaKey, received, delay, retries)) =
+          RcvFileChunk
+            { rcvFileId,
+              rcvFileEntityId,
+              userId,
+              rcvChunkId,
+              chunkNo,
+              chunkSize,
+              digest,
+              fileTmpPath,
+              chunkTmpPath,
+              replicas = [RcvFileChunkReplica {rcvChunkReplicaId, server, replicaId, replicaKey, received, delay, retries}]
+            }

 getNextRcvFileToDecrypt :: DB.Connection -> NominalDiffTime -> IO (Either StoreError (Maybe RcvFile))
 getNextRcvFileToDecrypt db ttl =
@@ -22,8 +22,8 @@ import Database.SQLite.Simple (SQLError)
 import qualified Database.SQLite.Simple as SQL
 import qualified Simplex.Messaging.Agent.Store.SQLite.DB as DB
 import Simplex.Messaging.Util (diffToMilliseconds)
+import UnliftIO.Exception (bracket)
 import qualified UnliftIO.Exception as E
-import UnliftIO.MVar
 import UnliftIO.STM

 storeKey :: ScrubbedBytes -> Bool -> Maybe ScrubbedBytes
@@ -32,13 +32,16 @@ storeKey key keepKey = if keepKey || BA.null key then Just key else Nothing
 data SQLiteStore = SQLiteStore
  { dbFilePath :: FilePath,
    dbKey :: TVar (Maybe ScrubbedBytes),
-    dbConnection :: MVar DB.Connection,
+    dbConnection :: TMVar DB.Connection,
    dbClosed :: TVar Bool,
    dbNew :: Bool
  }

 withConnection :: SQLiteStore -> (DB.Connection -> IO a) -> IO a
-withConnection SQLiteStore {dbConnection} = withMVar dbConnection
+withConnection SQLiteStore {dbConnection} =
+  bracket
+    (atomically $ takeTMVar dbConnection)
+    (atomically . putTMVar dbConnection)

 withConnection' :: SQLiteStore -> (SQL.Connection -> IO a) -> IO a
 withConnection' st action = withConnection st $ action . DB.conn
@@ -68,9 +71,9 @@ dbBusyLoop action = loop 500 3000000
    loop :: Int -> Int -> IO a
    loop t tLim =
      action `E.catch` \(e :: SQLError) ->
-        let se = SQL.sqlError e
-         in if tLim > t && (se == SQL.ErrorBusy || se == SQL.ErrorLocked)
-              then do
-                threadDelay t
-                loop (t * 9 `div` 8) (tLim - t)
-              else E.throwIO e
+        let se = SQL.sqlError e in
+        if tLim > t && (se == SQL.ErrorBusy || se == SQL.ErrorLocked)
+          then do
+            threadDelay t
+            loop (t * 9 `div` 8) (tLim - t)
+          else E.throwIO e
@@ -71,7 +71,6 @@ import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240121_message_deliver
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240124_file_redirect
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240223_connections_wait_delivery
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240225_ratchet_kem
-import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240417_rcv_files_approved_relays
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers (dropPrefix, sumTypeJSON)
 import Simplex.Messaging.Transport.Client (TransportHost)
@@ -111,8 +110,7 @@ schemaMigrations =
    ("m20240121_message_delivery_indexes", m20240121_message_delivery_indexes, Just down_m20240121_message_delivery_indexes),
    ("m20240124_file_redirect", m20240124_file_redirect, Just down_m20240124_file_redirect),
    ("m20240223_connections_wait_delivery", m20240223_connections_wait_delivery, Just down_m20240223_connections_wait_delivery),
-    ("m20240225_ratchet_kem", m20240225_ratchet_kem, Just down_m20240225_ratchet_kem),
-    ("m20240417_rcv_files_approved_relays", m20240417_rcv_files_approved_relays, Just down_m20240417_rcv_files_approved_relays)
+    ("m20240225_ratchet_kem", m20240225_ratchet_kem, Just down_m20240225_ratchet_kem)
  ]

 -- | The list of migrations in ascending order by date
@@ -1,18 +0,0 @@
-{-# LANGUAGE QuasiQuotes #-}
-
-module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240417_rcv_files_approved_relays where
-
-import Database.SQLite.Simple (Query)
-import Database.SQLite.Simple.QQ (sql)
-
-m20240417_rcv_files_approved_relays :: Query
-m20240417_rcv_files_approved_relays =
-    [sql|
-ALTER TABLE rcv_files ADD COLUMN approved_relays INTEGER NOT NULL DEFAULT 0;
-|]
-
-down_m20240417_rcv_files_approved_relays :: Query
-down_m20240417_rcv_files_approved_relays =
-    [sql|
-ALTER TABLE rcv_files DROP COLUMN approved_relays;
-|]
@@ -287,7 +287,6 @@ CREATE TABLE rcv_files(
  redirect_entity_id BLOB,
  redirect_size INTEGER,
  redirect_digest BLOB,
-  approved_relays INTEGER NOT NULL DEFAULT 0,
  UNIQUE(rcv_file_entity_id)
 );
 CREATE TABLE rcv_file_chunks(
@@ -30,11 +30,9 @@ module Simplex.Messaging.Client
    TransportSession,
    ProtocolClient (thParams, sessionTs),
    SMPClient,
-    ProxiedRelay (..),
    getProtocolClient,
    closeProtocolClient,
    protocolClientServer,
-    protocolClientServer',
    transportHost',
    transportSession',

@@ -56,24 +54,14 @@ module Simplex.Messaging.Client
    suspendSMPQueue,
    deleteSMPQueue,
    deleteSMPQueues,
-    connectSMPProxiedRelay,
-    proxySMPMessage,
-    forwardSMPMessage,
-    getSMPQueueInfo,
    sendProtocolCommand,

    -- * Supporting types and client configuration
    ProtocolClientError (..),
    SMPClientError,
-    ProxyClientError (..),
-    unexpectedResponse,
    ProtocolClientConfig (..),
    NetworkConfig (..),
    TransportSessionMode (..),
-    HostMode (..),
-    SocksMode (..),
-    SMPProxyMode (..),
-    SMPProxyFallback (..),
    defaultClientConfig,
    defaultSMPClientConfig,
    defaultNetworkConfig,
@@ -81,9 +69,7 @@ module Simplex.Messaging.Client
    chooseTransportHost,
    proxyUsername,
    temporaryClientError,
-    smpProxyError,
-    ServerTransmissionBatch,
-    ServerTransmission (..),
+    ServerTransmission,
    ClientCommand,

    -- * For testing
@@ -91,26 +77,18 @@ module Simplex.Messaging.Client
    mkTransmission,
    authTransmission,
    smpClientStub,
-
-    -- * For debugging
-    TBQueueInfo (..),
-    getTBQueueInfo,
-    getProtocolClientQueuesInfo,
  )
 where

-import Control.Applicative ((<|>))
 import Control.Concurrent.Async
 import Control.Concurrent.STM
 import Control.Exception
-import Control.Logger.Simple
 import Control.Monad
 import Control.Monad.Except
 import Control.Monad.IO.Class (liftIO)
 import Control.Monad.Trans.Except
 import Crypto.Random (ChaChaDRG)
 import qualified Data.Aeson.TH as J
-import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import Data.Functor (($>))
@@ -118,25 +96,21 @@ import Data.Int (Int64)
 import Data.List (find)
 import Data.List.NonEmpty (NonEmpty (..))
 import qualified Data.List.NonEmpty as L
-import Data.Maybe (catMaybes, fromMaybe)
+import Data.Maybe (fromMaybe)
 import Data.Time.Clock (UTCTime (..), diffUTCTime, getCurrentTime)
-import qualified Data.X509 as X
-import qualified Data.X509.Validation as XV
 import Network.Socket (ServiceName)
 import Numeric.Natural
 import qualified Simplex.Messaging.Crypto as C
-import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers (defaultJSON, dropPrefix, enumJSON)
 import Simplex.Messaging.Protocol
-import Simplex.Messaging.Server.QueueStore.QueueInfo
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport
 import Simplex.Messaging.Transport.Client (SocksProxy, TransportClientConfig (..), TransportHost (..), defaultTcpConnectTimeout, runTransportClient)
 import Simplex.Messaging.Transport.KeepAlive
 import Simplex.Messaging.Transport.WebSockets (WS)
-import Simplex.Messaging.Util (bshow, diffToMicroseconds, ifM, liftEitherWith, raceAny_, threadDelay', tshow, whenM)
+import Simplex.Messaging.Util (bshow, diffToMicroseconds, raceAny_, threadDelay', whenM)
 import Simplex.Messaging.Version
 import System.Timeout (timeout)

@@ -154,16 +128,16 @@ data PClient v err msg = PClient
  { connected :: TVar Bool,
    transportSession :: TransportSession msg,
    transportHost :: TransportHost,
-    tcpConnectTimeout :: Int,
    tcpTimeout :: Int,
+    rcvConcurrency :: Int,
    sendPings :: TVar Bool,
    lastReceived :: TVar UTCTime,
    timeoutErrorCount :: TVar Int,
    clientCorrId :: TVar ChaChaDRG,
    sentCommands :: TMap CorrId (Request err msg),
-    sndQ :: TBQueue (Maybe (TVar Bool), ByteString),
+    sndQ :: TBQueue (TVar Bool, ByteString),
    rcvQ :: TBQueue (NonEmpty (SignedTransmission err msg)),
-    msgQ :: Maybe (TBQueue (ServerTransmissionBatch v err msg))
+    msgQ :: Maybe (TBQueue (ServerTransmission v msg))
  }

 smpClientStub :: TVar ChaChaDRG -> ByteString -> VersionSMP -> Maybe (THandleAuth 'TClient) -> STM SMPClient
@@ -184,7 +158,6 @@ smpClientStub g sessionId thVersion thAuth = do
          THandleParams
            { sessionId,
              thVersion,
-              thServerVRange = supportedServerSMPRelayVRange,
              thAuth,
              blockSize = smpBlockSize,
              implySessId = thVersion >= authCmdsSMPVersion,
@@ -196,8 +169,8 @@ smpClientStub g sessionId thVersion thAuth = do
            { connected,
              transportSession = (1, "smp://LcJUMfVhwD8yxjAiSaDzzGF3-kLG4Uh0Fl_ZIjrRwjI=@localhost:5001", Nothing),
              transportHost = "localhost",
-              tcpConnectTimeout = 20_000_000,
              tcpTimeout = 15_000_000,
+              rcvConcurrency = 8,
              sendPings,
              lastReceived,
              timeoutErrorCount,
@@ -214,14 +187,8 @@ type SMPClient = ProtocolClient SMPVersion ErrorType BrokerMsg
 -- | Type for client command data
 type ClientCommand msg = (Maybe C.APrivateAuthKey, EntityId, ProtoCommand msg)

-- | Type synonym for transmission from SPM servers.
-- Batch response is presented as a single `ServerTransmissionBatch` tuple.
-type ServerTransmissionBatch v err msg = (TransportSession msg, Version v, SessionId, NonEmpty (EntityId, ServerTransmission err msg))
-
-data ServerTransmission err msg
-  = STEvent (Either (ProtocolClientError err) msg)
-  | STResponse (ProtoCommand msg) (Either (ProtocolClientError err) msg)
-  | STUnexpectedError (ProtocolClientError err)
+-- | Type synonym for transmission from some SPM server queue.
+type ServerTransmission v msg = (TransportSession msg, Version v, SessionId, Bool, EntityId, msg)

 data HostMode
  = -- | prefer (or require) onion hosts when connecting via SOCKS proxy
@@ -232,30 +199,16 @@ data HostMode
    HMPublic
  deriving (Eq, Show)

-data SocksMode
-  = -- | always use SOCKS proxy when enabled
-    SMAlways
-  | -- | use SOCKS proxy only for .onion hosts when no public host is available
-    -- This mode is used in SMP proxy to minimize SOCKS proxy usage.
-    SMOnion
-  deriving (Eq, Show)
-
 -- | network configuration for the client
 data NetworkConfig = NetworkConfig
  { -- | use SOCKS5 proxy
    socksProxy :: Maybe SocksProxy,
-    -- | when to use SOCKS proxy
-    socksMode :: SocksMode,
    -- | 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,
    -- | transport sessions are created per user or per entity
    sessionMode :: TransportSessionMode,
-    -- | SMP proxy mode
-    smpProxyMode :: SMPProxyMode,
-    -- | Fallback to direct connection when destination SMP relay does not support SMP proxy protocol extensions
-    smpProxyFallback :: SMPProxyFallback,
    -- | timeout for the initial client TCP/TLS connection (microseconds)
    tcpConnectTimeout :: Int,
    -- | timeout of protocol commands (microseconds)
@@ -277,56 +230,13 @@ data NetworkConfig = NetworkConfig
 data TransportSessionMode = TSMUser | TSMEntity
  deriving (Eq, Show)

-- SMP proxy mode for sending messages
-data SMPProxyMode
-  = SPMAlways
-  | SPMUnknown -- use with unknown relays
-  | SPMUnprotected -- use with unknown relays when IP address is not protected (i.e., when neither SOCKS proxy nor .onion address is used)
-  | SPMNever
-  deriving (Eq, Show)
-
-data SMPProxyFallback
-  = SPFAllow -- connect directly when chosen proxy or destination relay do not support proxy protocol.
-  | SPFAllowProtected -- connect directly only when IP address is protected (SOCKS proxy or .onion address is used).
-  | SPFProhibit -- prohibit direct connection to destination relay.
-  deriving (Eq, Show)
-
-instance StrEncoding SMPProxyMode where
-  strEncode = \case
-    SPMAlways -> "always"
-    SPMUnknown -> "unknown"
-    SPMUnprotected -> "unprotected"
-    SPMNever -> "never"
-  strP =
-    A.takeTill (== ' ') >>= \case
-      "always" -> pure SPMAlways
-      "unknown" -> pure SPMUnknown
-      "unprotected" -> pure SPMUnprotected
-      "never" -> pure SPMNever
-      _ -> fail "Invalid SMP proxy mode"
-
-instance StrEncoding SMPProxyFallback where
-  strEncode = \case
-    SPFAllow -> "yes"
-    SPFAllowProtected -> "protected"
-    SPFProhibit -> "no"
-  strP =
-    A.takeTill (== ' ') >>= \case
-      "yes" -> pure SPFAllow
-      "protected" -> pure SPFAllowProtected
-      "no" -> pure SPFProhibit
-      _ -> fail "Invalid SMP proxy fallback mode"
-
 defaultNetworkConfig :: NetworkConfig
 defaultNetworkConfig =
  NetworkConfig
    { socksProxy = Nothing,
-      socksMode = SMAlways,
      hostMode = HMOnionViaSocks,
      requiredHostMode = False,
      sessionMode = TSMUser,
-      smpProxyMode = SPMNever,
-      smpProxyFallback = SPFAllow,
      tcpConnectTimeout = defaultTcpConnectTimeout,
      tcpTimeout = 15_000_000,
      tcpTimeoutPerKb = 5_000,
@@ -337,14 +247,9 @@ defaultNetworkConfig =
      logTLSErrors = False
    }

-transportClientConfig :: NetworkConfig -> TransportHost -> TransportClientConfig
-transportClientConfig NetworkConfig {socksProxy, socksMode, tcpConnectTimeout, tcpKeepAlive, logTLSErrors} host =
-  TransportClientConfig {socksProxy = useSocksProxy socksMode, tcpConnectTimeout, tcpKeepAlive, logTLSErrors, clientCredentials = Nothing, alpn = Nothing}
-  where
-    useSocksProxy SMAlways = socksProxy
-    useSocksProxy SMOnion = case host of
-      THOnionHost _ -> socksProxy
-      _ -> Nothing
+transportClientConfig :: NetworkConfig -> TransportClientConfig
+transportClientConfig NetworkConfig {socksProxy, tcpConnectTimeout, tcpKeepAlive, logTLSErrors} =
+  TransportClientConfig {socksProxy, tcpConnectTimeout, tcpKeepAlive, logTLSErrors, clientCredentials = Nothing, alpn = Nothing}
 {-# INLINE transportClientConfig #-}

 -- | protocol client configuration.
@@ -358,7 +263,7 @@ data ProtocolClientConfig v = ProtocolClientConfig
    clientALPN :: Maybe [ALPN],
    -- | client-server protocol version range
    serverVRange :: VersionRange v,
-    -- | agree shared session secret (used in SMP proxy for additional encryption layer)
+    -- | agree shared session secret (used in SMP proxy)
    agreeSecret :: Bool
  }

@@ -382,8 +287,6 @@ defaultSMPClientConfig = defaultClientConfig (Just supportedSMPHandshakes) suppo
 data Request err msg = Request
  { corrId :: CorrId,
    entityId :: EntityId,
-    command :: ProtoCommand msg,
-    pending :: TVar Bool,
    responseVar :: TMVar (Either (ProtocolClientError err) msg)
  }

@@ -407,14 +310,10 @@ chooseTransportHost NetworkConfig {socksProxy, hostMode, requiredHostMode} hosts
    publicHost = find (not . isOnionHost) hosts

 protocolClientServer :: ProtocolTypeI (ProtoType msg) => ProtocolClient v err msg -> String
-protocolClientServer = B.unpack . strEncode . protocolClientServer'
-{-# INLINE protocolClientServer #-}
-
-protocolClientServer' :: ProtocolClient v err msg -> ProtoServer msg
-protocolClientServer' = snd3 . transportSession . client_
+protocolClientServer = B.unpack . strEncode . snd3 . transportSession . client_
  where
    snd3 (_, s, _) = s
-{-# INLINE protocolClientServer' #-}
+{-# INLINE protocolClientServer #-}

 transportHost' :: ProtocolClient v err msg -> TransportHost
 transportHost' = transportHost . client_
@@ -434,7 +333,7 @@ type TransportSession msg = (UserId, ProtoServer msg, Maybe EntityId)
 --
 -- A single queue can be used for multiple 'SMPClient' instances,
 -- as 'SMPServerTransmission' includes server information.
-getProtocolClient :: forall v err msg. Protocol v err msg => TVar ChaChaDRG -> TransportSession msg -> ProtocolClientConfig v -> Maybe (TBQueue (ServerTransmissionBatch v err msg)) -> (ProtocolClient v err msg -> IO ()) -> IO (Either (ProtocolClientError err) (ProtocolClient v err msg))
+getProtocolClient :: forall v err msg. Protocol v err msg => TVar ChaChaDRG -> TransportSession msg -> ProtocolClientConfig v -> Maybe (TBQueue (ServerTransmission v msg)) -> (ProtocolClient v err msg -> IO ()) -> IO (Either (ProtocolClientError err) (ProtocolClient v err msg))
 getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize, networkConfig, clientALPN, serverVRange, agreeSecret} msgQ disconnected = do
  case chooseTransportHost networkConfig (host srv) of
    Right useHost ->
@@ -442,7 +341,7 @@ getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize
        `catch` \(e :: IOException) -> pure . Left $ PCEIOError e
    Left e -> pure $ Left e
  where
-    NetworkConfig {tcpConnectTimeout, tcpTimeout, smpPingInterval} = networkConfig
+    NetworkConfig {tcpConnectTimeout, tcpTimeout, rcvConcurrency, smpPingInterval} = networkConfig
    mkProtocolClient :: TransportHost -> UTCTime -> STM (PClient v err msg)
    mkProtocolClient transportHost ts = do
      connected <- newTVar False
@@ -458,13 +357,13 @@ getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize
          { connected,
            transportSession,
            transportHost,
-            tcpConnectTimeout,
            tcpTimeout,
            sendPings,
            lastReceived,
            timeoutErrorCount,
            clientCorrId,
            sentCommands,
+            rcvConcurrency,
            sndQ,
            rcvQ,
            msgQ
@@ -473,7 +372,7 @@ getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize
    runClient :: (ServiceName, ATransport) -> TransportHost -> PClient v err msg -> IO (Either (ProtocolClientError err) (ProtocolClient v err msg))
    runClient (port', ATransport t) useHost c = do
      cVar <- newEmptyTMVarIO
-      let tcConfig = (transportClientConfig networkConfig useHost) {alpn = clientALPN}
+      let tcConfig = (transportClientConfig networkConfig) {alpn = clientALPN}
          username = proxyUsername transportSession
      action <-
        async $
@@ -503,15 +402,11 @@ getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize
          atomically $ do
            writeTVar (connected c) True
            putTMVar cVar $ Right c'
-          raceAny_ ([send c' th, process c', receive c' th] <> [monitor c' | smpPingInterval > 0])
+          raceAny_ ([send c' th, process c', receive c' th] <> [ping c' | smpPingInterval > 0])
            `finally` disconnected c'

    send :: Transport c => ProtocolClient v err msg -> THandle v c 'TClient -> IO ()
-    send ProtocolClient {client_ = PClient {sndQ}} h = forever $ atomically (readTBQueue sndQ) >>= sendPending
-      where
-        sendPending (Nothing, s) = send_ s
-        sendPending (Just pending, s) = whenM (readTVarIO pending) $ send_ s
-        send_ = void . tPutLog h
+    send ProtocolClient {client_ = PClient {sndQ}} h = forever $ atomically (readTBQueue sndQ) >>= \(active, s) -> whenM (readTVarIO active) (void $ tPutLog h s)

    receive :: Transport c => ProtocolClient v err msg -> THandle v c 'TClient -> IO ()
    receive ProtocolClient {client_ = PClient {rcvQ, lastReceived, timeoutErrorCount}} h = forever $ do
@@ -519,8 +414,8 @@ getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize
      getCurrentTime >>= atomically . writeTVar lastReceived
      atomically $ writeTVar timeoutErrorCount 0

-    monitor :: ProtocolClient v err msg -> IO ()
-    monitor c@ProtocolClient {client_ = PClient {sendPings, lastReceived, timeoutErrorCount}} = loop smpPingInterval
+    ping :: ProtocolClient v err msg -> IO ()
+    ping c@ProtocolClient {client_ = PClient {sendPings, lastReceived, timeoutErrorCount}} = loop smpPingInterval
      where
        loop :: Int64 -> IO ()
        loop delay = do
@@ -540,48 +435,31 @@ getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize
        maxCnt = smpPingCount networkConfig

    process :: ProtocolClient v err msg -> IO ()
-    process c = forever $ atomically (readTBQueue $ rcvQ $ client_ c) >>= processMsgs c
+    process c = forever $ atomically (readTBQueue $ rcvQ $ client_ c) >>= mapM_ (processMsg c)

-    processMsgs :: ProtocolClient v err msg -> NonEmpty (SignedTransmission err msg) -> IO ()
-    processMsgs c ts = do
-      ts' <- catMaybes <$> mapM (processMsg c) (L.toList ts)
-      forM_ msgQ $ \q ->
-        mapM_ (atomically . writeTBQueue q . serverTransmission c) (L.nonEmpty ts')
-
-    processMsg :: ProtocolClient v err msg -> SignedTransmission err msg -> IO (Maybe (EntityId, ServerTransmission err msg))
-    processMsg ProtocolClient {client_ = PClient {sentCommands}} (_, _, (corrId, entId, respOrErr))
-      | B.null $ bs corrId = sendMsg $ STEvent clientResp
-      | otherwise =
+    processMsg :: ProtocolClient v err msg -> SignedTransmission err msg -> IO ()
+    processMsg c@ProtocolClient {client_ = PClient {sentCommands}} (_, _, (corrId, entId, respOrErr))
+      | isResponse =
          atomically (TM.lookup corrId sentCommands) >>= \case
-            Nothing -> sendMsg $ STUnexpectedError unexpected
-            Just Request {entityId, command, pending, responseVar} -> do
-              wasPending <-
-                atomically $ do
-                  TM.delete corrId sentCommands
-                  ifM
-                    (swapTVar pending False)
-                    (True <$ tryPutTMVar responseVar (if entityId == entId then clientResp else Left unexpected))
-                    (pure False)
-              if wasPending
-                then pure Nothing
-                else sendMsg $ if entityId == entId then STResponse command clientResp else STUnexpectedError unexpected
+            Nothing -> sendMsg respOrErr
+            Just Request {entityId, responseVar} -> atomically $ do
+              TM.delete corrId sentCommands
+              putTMVar responseVar $ response entityId
+      | otherwise = sendMsg respOrErr
      where
-        unexpected = unexpectedResponse respOrErr
-        clientResp = case respOrErr of
-          Left e -> Left $ PCEResponseError e
-          Right r -> case protocolError r of
-            Just e -> Left $ PCEProtocolError e
-            _ -> Right r
-        sendMsg :: ServerTransmission err msg -> IO (Maybe (EntityId, ServerTransmission err msg))
-        sendMsg t = case msgQ of
-          Just _ -> pure $ Just (entId, t)
-          Nothing ->
-            Nothing <$ case clientResp of
-              Left e -> logError $ "SMP client error: " <> tshow e
-              Right _ -> logWarn "SMP client unprocessed event"
-
-unexpectedResponse :: Show r => r -> ProtocolClientError err
-unexpectedResponse = PCEUnexpectedResponse . B.pack . take 32 . show
+        isResponse = not $ B.null $ bs corrId
+        response entityId
+          | entityId == entId =
+              case respOrErr of
+                Left e -> Left $ PCEResponseError e
+                Right r -> case protocolError r of
+                  Just e -> Left $ PCEProtocolError e
+                  _ -> Right r
+          | otherwise = Left . PCEUnexpectedResponse $ bshow respOrErr
+        sendMsg :: Either err msg -> IO ()
+        sendMsg = \case
+          Right msg -> atomically $ mapM_ (`writeTBQueue` serverTransmission c isResponse entId msg) msgQ
+          Left e -> putStrLn $ "SMP client error: " <> show e

 proxyUsername :: TransportSession msg -> ByteString
 proxyUsername (userId, _, entityId_) = C.sha256Hash $ bshow userId <> maybe "" (":" <>) entityId_
@@ -632,19 +510,6 @@ temporaryClientError = \case
  _ -> False
 {-# INLINE temporaryClientError #-}

-- converts error of client running on proxy to the error sent to client connected to proxy
-smpProxyError :: SMPClientError -> ErrorType
-smpProxyError = \case
-  PCEProtocolError e -> PROXY $ PROTOCOL e
-  PCEResponseError e -> PROXY $ BROKER $ RESPONSE $ B.unpack $ strEncode e
-  PCEUnexpectedResponse e -> PROXY $ BROKER $ UNEXPECTED $ B.unpack e
-  PCEResponseTimeout -> PROXY $ BROKER TIMEOUT
-  PCENetworkError -> PROXY $ BROKER NETWORK
-  PCEIncompatibleHost -> PROXY $ BROKER HOST
-  PCETransportError t -> PROXY $ BROKER $ TRANSPORT t
-  PCECryptoError _ -> CRYPTO
-  PCEIOError _ -> INTERNAL
-
 -- | Create a new SMP queue.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#create-queue-command
@@ -658,7 +523,7 @@ createSMPQueue ::
 createSMPQueue c (rKey, rpKey) dhKey auth subMode =
  sendSMPCommand c (Just rpKey) "" (NEW rKey dhKey auth subMode) >>= \case
    IDS qik -> pure qik
-    r -> throwE $ unexpectedResponse r
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 -- | Subscribe to the SMP queue.
 --
@@ -669,7 +534,7 @@ subscribeSMPQueue c@ProtocolClient {client_ = PClient {sendPings}} rpKey rId = d
  sendSMPCommand c (Just rpKey) rId SUB >>= \case
    OK -> pure ()
    cmd@MSG {} -> liftIO $ writeSMPMessage c rId cmd
-    r -> throwE $ unexpectedResponse r
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 -- | Subscribe to multiple SMP queues batching commands if supported.
 subscribeSMPQueues :: SMPClient -> NonEmpty (RcvPrivateAuthKey, RecipientId) -> IO (NonEmpty (Either SMPClientError ()))
@@ -689,15 +554,15 @@ processSUBResponse :: SMPClient -> Response ErrorType BrokerMsg -> IO (Either SM
 processSUBResponse c (Response rId r) = case r of
  Right OK -> pure $ Right ()
  Right cmd@MSG {} -> writeSMPMessage c rId cmd $> Right ()
-  Right r' -> pure . Left $ unexpectedResponse r'
+  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, STEvent (Right msg))]) (msgQ $ client_ c)
+writeSMPMessage c rId msg = atomically $ mapM_ (`writeTBQueue` serverTransmission c False rId msg) (msgQ $ client_ c)

-serverTransmission :: ProtocolClient v err msg -> NonEmpty (RecipientId, ServerTransmission err msg) -> ServerTransmissionBatch v err msg
-serverTransmission ProtocolClient {thParams = THandleParams {thVersion, sessionId}, client_ = PClient {transportSession}} ts =
-  (transportSession, thVersion, sessionId, ts)
+serverTransmission :: ProtocolClient v err msg -> Bool -> RecipientId -> msg -> ServerTransmission v msg
+serverTransmission ProtocolClient {thParams = THandleParams {thVersion, sessionId}, client_ = PClient {transportSession}} isResponse entityId message =
+  (transportSession, thVersion, sessionId, isResponse, 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
 --
@@ -707,7 +572,7 @@ 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 $ unexpectedResponse r
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 -- | Subscribe to the SMP queue notifications.
 --
@@ -735,7 +600,7 @@ enableSMPQueueNotifications :: SMPClient -> RcvPrivateAuthKey -> RecipientId ->
 enableSMPQueueNotifications c rpKey rId notifierKey rcvNtfPublicDhKey =
  sendSMPCommand c (Just rpKey) rId (NKEY notifierKey rcvNtfPublicDhKey) >>= \case
    NID nId rcvNtfSrvPublicDhKey -> pure (nId, rcvNtfSrvPublicDhKey)
-    r -> throwE $ unexpectedResponse r
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 -- | Enable notifications for the multiple queues for push notifications server.
 enableSMPQueuesNtfs :: SMPClient -> NonEmpty (RcvPrivateAuthKey, RecipientId, NtfPublicAuthKey, RcvNtfPublicDhKey) -> IO (NonEmpty (Either SMPClientError (NotifierId, RcvNtfPublicDhKey)))
@@ -744,7 +609,7 @@ enableSMPQueuesNtfs c qs = L.map process <$> sendProtocolCommands c cs
    cs = L.map (\(rpKey, rId, notifierKey, rcvNtfPublicDhKey) -> (Just rpKey, rId, Cmd SRecipient $ NKEY notifierKey rcvNtfPublicDhKey)) qs
    process (Response _ r) = case r of
      Right (NID nId rcvNtfSrvPublicDhKey) -> Right (nId, rcvNtfSrvPublicDhKey)
-      Right r' -> Left $ unexpectedResponse r'
+      Right r' -> Left . PCEUnexpectedResponse $ bshow r'
      Left e -> Left e

 -- | Disable notifications for the queue for push notifications server.
@@ -766,7 +631,7 @@ sendSMPMessage :: SMPClient -> Maybe SndPrivateAuthKey -> SenderId -> MsgFlags -
 sendSMPMessage c spKey sId flags msg =
  sendSMPCommand c spKey sId (SEND flags msg) >>= \case
    OK -> pure ()
-    r -> throwE $ unexpectedResponse r
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 -- | Acknowledge message delivery (server deletes the message).
 --
@@ -776,7 +641,7 @@ ackSMPMessage c rpKey rId msgId =
  sendSMPCommand c (Just rpKey) rId (ACK msgId) >>= \case
    OK -> return ()
    cmd@MSG {} -> liftIO $ writeSMPMessage c rId cmd
-    r -> throwE $ unexpectedResponse r
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 -- | Irreversibly suspend SMP queue.
 -- The existing messages from the queue will still be delivered.
@@ -798,167 +663,11 @@ deleteSMPQueues :: SMPClient -> NonEmpty (RcvPrivateAuthKey, RecipientId) -> IO
 deleteSMPQueues = okSMPCommands DEL
 {-# INLINE deleteSMPQueues #-}

-- send PRXY :: SMPServer -> Maybe BasicAuth -> Command Sender
-- receives PKEY :: SessionId -> X.CertificateChain -> X.SignedExact X.PubKey -> BrokerMsg
-connectSMPProxiedRelay :: SMPClient -> SMPServer -> Maybe BasicAuth -> ExceptT SMPClientError IO ProxiedRelay
-connectSMPProxiedRelay c@ProtocolClient {client_ = PClient {tcpConnectTimeout, tcpTimeout}} relayServ@ProtocolServer {keyHash = C.KeyHash kh} proxyAuth
-  | thVersion (thParams c) >= sendingProxySMPVersion =
-      sendProtocolCommand_ c Nothing tOut Nothing "" (Cmd SProxiedClient (PRXY relayServ proxyAuth)) >>= \case
-        PKEY sId vr (chain, key) ->
-          case supportedClientSMPRelayVRange `compatibleVersion` vr of
-            Nothing -> throwE $ transportErr TEVersion
-            Just (Compatible v) -> liftEitherWith (const $ transportErr $ TEHandshake IDENTITY) $ ProxiedRelay sId v <$> validateRelay chain key
-        r -> throwE $ unexpectedResponse r
-  | otherwise = throwE $ PCETransportError TEVersion
-  where
-    tOut = Just $ tcpConnectTimeout + tcpTimeout
-    transportErr = PCEProtocolError . PROXY . BROKER . TRANSPORT
-    validateRelay :: X.CertificateChain -> X.SignedExact X.PubKey -> Either String C.PublicKeyX25519
-    validateRelay (X.CertificateChain cert) exact = do
-      serverKey <- case cert of
-        [leaf, ca]
-          | XV.Fingerprint kh == XV.getFingerprint ca X.HashSHA256 ->
-              C.x509ToPublic (X.certPubKey . X.signedObject $ X.getSigned leaf, []) >>= C.pubKey
-        _ -> throwError "bad certificate"
-      pubKey <- C.verifyX509 serverKey exact
-      C.x509ToPublic (pubKey, []) >>= C.pubKey
-
-data ProxiedRelay = ProxiedRelay
-  { prSessionId :: SessionId,
-    prVersion :: VersionSMP,
-    prServerKey :: C.PublicKeyX25519
-  }
-
-data ProxyClientError
-  = -- | protocol error response from proxy
-    ProxyProtocolError ErrorType
-  | -- | unexpexted response
-    ProxyUnexpectedResponse String
-  | -- | error between proxy and server
-    ProxyResponseError ErrorType
-  deriving (Eq, Show, Exception)
-
-instance StrEncoding ProxyClientError where
-  strEncode = \case
-    ProxyProtocolError e -> "PROTOCOL " <> strEncode e
-    ProxyUnexpectedResponse s -> "UNEXPECTED " <> B.pack s
-    ProxyResponseError e -> "SYNTAX " <> strEncode e
-  strP =
-    A.takeTill (== ' ') >>= \case
-      "PROTOCOL" -> ProxyProtocolError <$> _strP
-      "UNEXPECTED" -> ProxyUnexpectedResponse . B.unpack <$> (A.space *> A.takeByteString)
-      "SYNTAX" -> ProxyResponseError <$> _strP
-      _ -> fail "bad ProxyClientError"
-
-- consider how to process slow responses - is it handled somehow locally or delegated to the caller
-- this method is used in the client
-- sends PFWD :: C.PublicKeyX25519 -> EncTransmission -> Command Sender
-- receives PRES :: EncResponse -> BrokerMsg -- proxy to client
-
-- When client sends message via proxy, there may be one successful scenario and 9 error scenarios
-- as shown below (WTF stands for unexpected response, ??? for response that failed to parse).
--    client        proxy   relay   proxy        client
-- 0) PFWD(SEND) -> RFWD -> RRES -> PRES(OK)  -> ok
-- 1) PFWD(SEND) -> RFWD -> RRES -> PRES(ERR) -> PCEProtocolError - business logic error for client
-- 2) PFWD(SEND) -> RFWD -> RRES -> PRES(WTF) -> PCEUnexpectedReponse - relay/client protocol logic error
-- 3) PFWD(SEND) -> RFWD -> RRES -> PRES(???) -> PCEResponseError - relay/client syntax error
-- 4) PFWD(SEND) -> RFWD -> ERR ->  ERR PROXY PROTOCOL -> ProxyProtocolError - proxy/relay business logic error
-- 5) PFWD(SEND) -> RFWD -> WTF ->  ERR PROXY $ BROKER (UNEXPECTED s) -> ProxyProtocolError - proxy/relay protocol logic
-- 6) PFWD(SEND) -> RFWD -> ??? ->  ERR PROXY $ BROKER (RESPONSE s) -> ProxyProtocolError - - proxy/relay syntax
-- 7) PFWD(SEND) -> ERR  -> ProxyProtocolError - client/proxy business logic
-- 8) PFWD(SEND) -> WTF  -> ProxyUnexpectedResponse - client/proxy protocol logic
-- 9) PFWD(SEND) -> ???  -> ProxyResponseError - client/proxy syntax
--
-- We report as proxySMPMessage error (ExceptT error) the errors of two kinds:
-- - protocol errors from the destination relay wrapped in PRES - to simplify processing of AUTH and QUOTA errors, in this case proxy is "transparent" for such errors (PCEProtocolError, PCEUnexpectedResponse, PCEResponseError)
-- - other response/transport/connection errors from the client connected to proxy itself
-- Other errors are reported in the function result as `Either ProxiedRelayError ()`, including
-- - protocol  errors from the client connected to proxy in ProxyClientError (PCEProtocolError, PCEUnexpectedResponse, PCEResponseError)
-- - other errors from the client running on proxy and connected to relay in PREProxiedRelayError
-
-proxySMPMessage ::
-  SMPClient ->
-  -- proxy session from PKEY
-  ProxiedRelay ->
-  -- message to deliver
-  Maybe SndPrivateAuthKey ->
-  SenderId ->
-  MsgFlags ->
-  MsgBody ->
-  ExceptT SMPClientError IO (Either ProxyClientError ())
-proxySMPMessage c@ProtocolClient {thParams = proxyThParams, client_ = PClient {clientCorrId = g, tcpTimeout}} (ProxiedRelay sessionId v serverKey) spKey sId flags msg = do
-  -- prepare params
-  let serverThAuth = (\ta -> ta {serverPeerPubKey = serverKey}) <$> thAuth proxyThParams
-      serverThParams = smpTHParamsSetVersion v proxyThParams {sessionId, thAuth = serverThAuth}
-  (cmdPubKey, cmdPrivKey) <- liftIO . atomically $ C.generateKeyPair @'C.X25519 g
-  let cmdSecret = C.dh' serverKey cmdPrivKey
-  nonce@(C.CbNonce corrId) <- liftIO . atomically $ C.randomCbNonce g
-  -- encode
-  let TransmissionForAuth {tForAuth, tToSend} = encodeTransmissionForAuth serverThParams (CorrId corrId, sId, Cmd SSender (SEND flags msg))
-  auth <- liftEitherWith PCETransportError $ authTransmission serverThAuth spKey nonce tForAuth
-  b <- case batchTransmissions (batch serverThParams) (blockSize serverThParams) [Right (auth, tToSend)] of
-    [] -> throwE $ PCETransportError TELargeMsg
-    TBError e _ : _ -> throwE $ PCETransportError e
-    TBTransmission s _ : _ -> pure s
-    TBTransmissions s _ _ : _ -> pure s
-  et <- liftEitherWith PCECryptoError $ EncTransmission <$> C.cbEncrypt cmdSecret nonce b paddedProxiedMsgLength
-  -- proxy interaction errors are wrapped
-  let tOut = Just $ 2 * tcpTimeout
-  tryE (sendProtocolCommand_ c (Just nonce) tOut Nothing sessionId (Cmd SProxiedClient (PFWD v cmdPubKey et))) >>= \case
-    Right r -> case r of
-      PRES (EncResponse er) -> do
-        -- server interaction errors are thrown directly
-        t' <- liftEitherWith PCECryptoError $ C.cbDecrypt cmdSecret (C.reverseNonce nonce) er
-        case tParse serverThParams t' of
-          t'' :| [] -> case tDecodeParseValidate serverThParams t'' of
-            (_auth, _signed, (_c, _e, cmd)) -> case cmd of
-              Right OK -> pure $ Right ()
-              Right (ERR e) -> throwE $ PCEProtocolError e -- this is the error from the destination relay
-              Right r' -> throwE $ unexpectedResponse r'
-              Left e -> throwE $ PCEResponseError e
-          _ -> throwE $ PCETransportError TEBadBlock
-      ERR e -> pure . Left $ ProxyProtocolError e -- this will not happen, this error is returned via Left
-      _ -> pure . Left $ ProxyUnexpectedResponse $ take 32 $ show r
-    Left e -> case e of
-      PCEProtocolError e' -> pure . Left $ ProxyProtocolError e'
-      PCEUnexpectedResponse e' -> pure . Left $ ProxyUnexpectedResponse $ B.unpack e'
-      PCEResponseError e' -> pure . Left $ ProxyResponseError e'
-      _ -> throwE e
-
-- this method is used in the proxy
-- sends RFWD :: EncFwdTransmission -> Command Sender
-- receives RRES :: EncFwdResponse -> BrokerMsg
-- proxy should send PRES to the client with EncResponse
-forwardSMPMessage :: SMPClient -> CorrId -> VersionSMP -> C.PublicKeyX25519 -> EncTransmission -> ExceptT SMPClientError IO EncResponse
-forwardSMPMessage c@ProtocolClient {thParams, client_ = PClient {clientCorrId = g}} fwdCorrId fwdVersion fwdKey fwdTransmission = do
-  -- prepare params
-  sessSecret <- case thAuth thParams of
-    Nothing -> throwE $ PCETransportError TENoServerAuth
-    Just THAuthClient {sessSecret} -> maybe (throwE $ PCETransportError TENoServerAuth) pure sessSecret
-  nonce <- liftIO . atomically $ C.randomCbNonce g
-  -- wrap
-  let fwdT = FwdTransmission {fwdCorrId, fwdVersion, fwdKey, fwdTransmission}
-      eft = EncFwdTransmission $ C.cbEncryptNoPad sessSecret nonce (smpEncode fwdT)
-  -- send
-  sendProtocolCommand_ c (Just nonce) Nothing Nothing "" (Cmd SSender (RFWD eft)) >>= \case
-    RRES (EncFwdResponse efr) -> do
-      -- unwrap
-      r' <- liftEitherWith PCECryptoError $ C.cbDecryptNoPad sessSecret (C.reverseNonce nonce) efr
-      FwdResponse {fwdCorrId = _, fwdResponse} <- liftEitherWith (const $ PCEResponseError BLOCK) $ smpDecode r'
-      pure fwdResponse
-    r -> throwE $ unexpectedResponse r
-
-getSMPQueueInfo :: SMPClient -> C.APrivateAuthKey -> QueueId -> ExceptT SMPClientError IO QueueInfo
-getSMPQueueInfo c pKey qId =
-  sendSMPCommand c (Just pKey) qId QUE >>= \case
-    INFO info -> pure info
-    r -> throwE $ unexpectedResponse r
-
 okSMPCommand :: PartyI p => Command p -> SMPClient -> C.APrivateAuthKey -> QueueId -> ExceptT SMPClientError IO ()
 okSMPCommand cmd c pKey qId =
  sendSMPCommand c (Just pKey) qId cmd >>= \case
    OK -> return ()
-    r -> throwE $ unexpectedResponse r
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 okSMPCommands :: PartyI p => Command p -> SMPClient -> NonEmpty (C.APrivateAuthKey, QueueId) -> IO (NonEmpty (Either SMPClientError ()))
 okSMPCommands cmd c qs = L.map process <$> sendProtocolCommands c cs
@@ -967,7 +676,7 @@ okSMPCommands cmd c qs = L.map process <$> sendProtocolCommands c cs
    cs = L.map (\(pKey, qId) -> (Just pKey, qId, aCmd)) qs
    process (Response _ r) = case r of
      Right OK -> Right ()
-      Right r' -> Left $ unexpectedResponse r'
+      Right r' -> Left . PCEUnexpectedResponse $ bshow r'
      Left e -> Left e

 -- | Send SMP command
@@ -978,7 +687,7 @@ sendSMPCommand c pKey qId cmd = sendProtocolCommand c pKey qId (Cmd sParty cmd)
 type PCTransmission err msg = (Either TransportError SentRawTransmission, Request err msg)

 -- | Send multiple commands with batching and collect responses
-sendProtocolCommands :: forall v err msg. Protocol v err msg => ProtocolClient v err msg -> NonEmpty (ClientCommand msg) -> IO (NonEmpty (Response err msg))
+sendProtocolCommands :: forall v err msg. ProtocolEncoding v err (ProtoCommand msg) => ProtocolClient v err msg -> NonEmpty (ClientCommand msg) -> IO (NonEmpty (Response err msg))
 sendProtocolCommands c@ProtocolClient {thParams = THandleParams {batch, blockSize}} cs = do
  bs <- batchTransmissions' batch blockSize <$> mapM (mkTransmission c) cs
  validate . concat =<< mapM (sendBatch c) bs
@@ -995,134 +704,91 @@ sendProtocolCommands c@ProtocolClient {thParams = THandleParams {batch, blockSiz
      where
        diff = L.length cs - length rs

-streamProtocolCommands :: forall v err msg. Protocol v err msg => ProtocolClient v err msg -> NonEmpty (ClientCommand msg) -> ([Response err msg] -> IO ()) -> IO ()
+streamProtocolCommands :: forall v err msg. ProtocolEncoding v err (ProtoCommand msg) => ProtocolClient v err msg -> NonEmpty (ClientCommand msg) -> ([Response err msg] -> IO ()) -> IO ()
 streamProtocolCommands c@ProtocolClient {thParams = THandleParams {batch, blockSize}} cs cb = do
  bs <- batchTransmissions' batch blockSize <$> mapM (mkTransmission c) cs
  mapM_ (cb <=< sendBatch c) bs

 sendBatch :: ProtocolClient v err msg -> TransportBatch (Request err msg) -> IO [Response err msg]
-sendBatch c@ProtocolClient {client_ = PClient {sndQ}} b = do
+sendBatch c@ProtocolClient {client_ = PClient {rcvConcurrency, sndQ}} b = do
  case b of
    TBError e Request {entityId} -> do
      putStrLn "send error: large message"
      pure [Response entityId $ Left $ PCETransportError e]
    TBTransmissions s n rs
      | n > 0 -> do
-          atomically $ writeTBQueue sndQ (Nothing, s) -- do not expire batched responses
-          mapConcurrently (getResponse c Nothing) rs
+          active <- newTVarIO True
+          atomically $ writeTBQueue sndQ (active, s)
+          mapConcurrently (getResponse c active) rs
      | otherwise -> pure []
    TBTransmission s r -> do
-      atomically $ writeTBQueue sndQ (Nothing, s)
-      (: []) <$> getResponse c Nothing r
+      active <- newTVarIO True
+      atomically $ writeTBQueue sndQ (active, s)
+      (: []) <$> getResponse c active r

 -- | Send Protocol command
-sendProtocolCommand :: forall v err msg. Protocol v err msg => ProtocolClient v err msg -> Maybe C.APrivateAuthKey -> EntityId -> ProtoCommand msg -> ExceptT (ProtocolClientError err) IO msg
-sendProtocolCommand c = sendProtocolCommand_ c Nothing Nothing
-
-- Currently there is coupling - batch commands do not expire, and individually sent commands do.
-- This is to reflect the fact that we send subscriptions only as batches, and also because we do not track a separate timeout for the whole batch, so it is not obvious when should we expire it.
-- We could expire a batch of deletes, for example, either when the first response expires or when the last one does.
-- But a better solution is to process delayed delete responses.
-sendProtocolCommand_ :: forall v err msg. Protocol v err msg => ProtocolClient v err msg -> Maybe C.CbNonce -> Maybe Int -> Maybe C.APrivateAuthKey -> EntityId -> ProtoCommand msg -> ExceptT (ProtocolClientError err) IO msg
-sendProtocolCommand_ c@ProtocolClient {client_ = PClient {sndQ}, thParams = THandleParams {batch, blockSize}} nonce_ tOut pKey entId cmd =
-  ExceptT $ uncurry sendRecv =<< mkTransmission_ c nonce_ (pKey, entId, cmd)
+sendProtocolCommand :: forall v err msg. ProtocolEncoding v err (ProtoCommand msg) => ProtocolClient v err msg -> Maybe C.APrivateAuthKey -> EntityId -> ProtoCommand msg -> ExceptT (ProtocolClientError err) IO msg
+sendProtocolCommand c@ProtocolClient {client_ = PClient {sndQ}, thParams = THandleParams {batch, blockSize}} pKey entId cmd =
+  ExceptT $ uncurry sendRecv =<< mkTransmission c (pKey, entId, cmd)
  where
    -- two separate "atomically" needed to avoid blocking
    sendRecv :: Either TransportError SentRawTransmission -> Request err msg -> IO (Either (ProtocolClientError err) msg)
-    sendRecv t_ r@Request {pending} = case t_ of
+    sendRecv t_ r = case t_ of
      Left e -> pure . Left $ PCETransportError e
      Right t
        | B.length s > blockSize - 2 -> pure . Left $ PCETransportError TELargeMsg
        | otherwise -> do
-            atomically $ writeTBQueue sndQ (Just pending, s)
-            response <$> getResponse c tOut r
+            active <- newTVarIO True
+            atomically (writeTBQueue sndQ (active, s))
+            response <$> getResponse c active r
        where
          s
            | batch = tEncodeBatch1 t
            | otherwise = tEncode t

-getResponse :: ProtocolClient v err msg -> Maybe Int -> Request err msg -> IO (Response err msg)
-getResponse ProtocolClient {client_ = PClient {tcpTimeout, timeoutErrorCount}} tOut Request {entityId, pending, responseVar} = do
-  r <- fromMaybe tcpTimeout tOut `timeout` atomically (takeTMVar responseVar)
-  response <- atomically $ do
-    writeTVar pending False
-    -- Try to read response again in case it arrived after timeout expired
-    -- but before `pending` was set to False above.
-    -- See `processMsg`.
-    ((r <|>) <$> tryTakeTMVar responseVar) >>= \case
-      Just r' -> writeTVar timeoutErrorCount 0 $> r'
-      Nothing -> modifyTVar' timeoutErrorCount (+ 1) $> Left PCEResponseTimeout
+-- TODO switch to timeout or TimeManager that supports Int64
+getResponse :: ProtocolClient v err msg -> TVar Bool -> Request err msg -> IO (Response err msg)
+getResponse ProtocolClient {client_ = PClient {tcpTimeout, timeoutErrorCount, sentCommands}} active Request {corrId, entityId, responseVar} = do
+  response <-
+    timeout tcpTimeout (atomically (takeTMVar responseVar)) >>= \case
+      Just r -> atomically (writeTVar timeoutErrorCount 0) $> r
+      Nothing -> do
+        atomically (writeTVar active False >> TM.delete corrId sentCommands)
+        atomically $ modifyTVar' timeoutErrorCount (+ 1)
+        pure $ Left PCEResponseTimeout
  pure Response {entityId, response}

-mkTransmission :: Protocol v err msg => ProtocolClient v err msg -> ClientCommand msg -> IO (PCTransmission err msg)
-mkTransmission c = mkTransmission_ c Nothing
-
-mkTransmission_ :: forall v err msg. Protocol v err msg => ProtocolClient v err msg -> Maybe C.CbNonce -> ClientCommand msg -> IO (PCTransmission err msg)
-mkTransmission_ ProtocolClient {thParams, client_ = PClient {clientCorrId, sentCommands}} nonce_ (pKey_, entityId, command) = do
-  nonce@(C.CbNonce corrId) <- maybe (atomically $ C.randomCbNonce clientCorrId) pure nonce_
-  let TransmissionForAuth {tForAuth, tToSend} = encodeTransmissionForAuth thParams (CorrId corrId, entityId, command)
-      auth = authTransmission (thAuth thParams) pKey_ nonce tForAuth
-  r <- atomically $ mkRequest (CorrId corrId)
+mkTransmission :: forall v err msg. ProtocolEncoding v err (ProtoCommand msg) => ProtocolClient v err msg -> ClientCommand msg -> IO (PCTransmission err msg)
+mkTransmission ProtocolClient {thParams, client_ = PClient {clientCorrId, sentCommands}} (pKey_, entId, cmd) = do
+  corrId <- atomically getNextCorrId
+  let TransmissionForAuth {tForAuth, tToSend} = encodeTransmissionForAuth thParams (corrId, entId, cmd)
+      auth = authTransmission (thAuth thParams) pKey_ corrId tForAuth
+  r <- atomically $ mkRequest corrId
  pure ((,tToSend) <$> auth, r)
  where
+    getNextCorrId :: STM CorrId
+    getNextCorrId = CorrId <$> C.randomBytes 24 clientCorrId -- also used as nonce
    mkRequest :: CorrId -> STM (Request err msg)
    mkRequest corrId = do
-      pending <- newTVar True
-      responseVar <- newEmptyTMVar
-      let r =
-            Request
-              { corrId,
-                entityId,
-                command,
-                pending,
-                responseVar
-              }
+      r <- Request corrId entId <$> newEmptyTMVar
      TM.insert corrId r sentCommands
      pure r

-authTransmission :: Maybe (THandleAuth 'TClient) -> Maybe C.APrivateAuthKey -> C.CbNonce -> ByteString -> Either TransportError (Maybe TransmissionAuth)
-authTransmission thAuth pKey_ nonce t = traverse authenticate pKey_
+authTransmission :: Maybe (THandleAuth 'TClient) -> Maybe C.APrivateAuthKey -> CorrId -> ByteString -> Either TransportError (Maybe TransmissionAuth)
+authTransmission thAuth pKey_ (CorrId corrId) t = traverse authenticate pKey_
  where
    authenticate :: C.APrivateAuthKey -> Either TransportError TransmissionAuth
    authenticate (C.APrivateAuthKey a pk) = case a of
      C.SX25519 -> case thAuth of
-        Just THAuthClient {serverPeerPubKey = k} -> Right $ TAAuthenticator $ C.cbAuthenticate k pk nonce t
+        Just THAuthClient {serverPeerPubKey = k} -> Right $ TAAuthenticator $ C.cbAuthenticate k pk (C.cbNonce corrId) t
        Nothing -> Left TENoServerAuth
      C.SEd25519 -> sign pk
      C.SEd448 -> sign pk
    sign :: forall a. (C.AlgorithmI a, C.SignatureAlgorithm a) => C.PrivateKey a -> Either TransportError TransmissionAuth
    sign pk = Right $ TASignature $ C.ASignature (C.sAlgorithm @a) (C.sign' pk t)

-data TBQueueInfo = TBQueueInfo
-  { qLength :: Int,
-    qFull :: Bool
-  }
-  deriving (Show)
-
-getTBQueueInfo :: TBQueue a -> STM TBQueueInfo
-getTBQueueInfo q = do
-  qLength <- fromIntegral <$> lengthTBQueue q
-  qFull <- isFullTBQueue q
-  pure TBQueueInfo {qLength, qFull}
-
-getProtocolClientQueuesInfo :: ProtocolClient v err msg -> IO (TBQueueInfo, TBQueueInfo)
-getProtocolClientQueuesInfo ProtocolClient {client_ = PClient {sndQ, rcvQ}} = do
-  sndQInfo <- atomically $ getTBQueueInfo sndQ
-  rcvQInfo <- atomically $ getTBQueueInfo rcvQ
-  pure (sndQInfo, rcvQInfo)
-
 $(J.deriveJSON (enumJSON $ dropPrefix "HM") ''HostMode)

-$(J.deriveJSON (enumJSON $ dropPrefix "SM") ''SocksMode)
-
 $(J.deriveJSON (enumJSON $ dropPrefix "TSM") ''TransportSessionMode)

-$(J.deriveJSON (enumJSON $ dropPrefix "SPM") ''SMPProxyMode)
-
-$(J.deriveJSON (enumJSON $ dropPrefix "SPF") ''SMPProxyFallback)
-
 $(J.deriveJSON defaultJSON ''NetworkConfig)
-
-$(J.deriveJSON (enumJSON $ dropPrefix "Proxy") ''ProxyClientError)
-
-$(J.deriveJSON defaultJSON ''TBQueueInfo)
@@ -2,24 +2,24 @@
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE InstanceSigs #-}
 {-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE MultiWayIf #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TupleSections #-}
 {-# LANGUAGE TypeApplications #-}
+{-# OPTIONS_GHC -fno-warn-orphans #-}

 module Simplex.Messaging.Client.Agent where

 import Control.Concurrent (forkIO)
 import Control.Concurrent.Async (Async, uninterruptibleCancel)
-import Control.Concurrent.STM (retry)
 import Control.Logger.Simple
 import Control.Monad
 import Control.Monad.Except
 import Control.Monad.IO.Unlift
 import Control.Monad.Trans.Except
+import Control.Monad.Trans.Reader
 import Crypto.Random (ChaChaDRG)
 import Data.Bifunctor (bimap, first)
 import Data.ByteString.Char8 (ByteString)
@@ -33,29 +33,30 @@ import qualified Data.Map.Strict as M
 import Data.Maybe (listToMaybe)
 import Data.Set (Set)
 import Data.Text.Encoding
-import Data.Time.Clock (NominalDiffTime, UTCTime, addUTCTime, getCurrentTime)
 import Data.Tuple (swap)
 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, ErrorType, NotifierId, NtfPrivateAuthKey, ProtocolServer (..), QueueId, RcvPrivateAuthKey, RecipientId, SMPServer)
+import Simplex.Messaging.Protocol (BrokerMsg, NotifierId, NtfPrivateAuthKey, ProtocolServer (..), QueueId, RcvPrivateAuthKey, RecipientId, SMPServer)
 import Simplex.Messaging.Session
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport
-import Simplex.Messaging.Util (catchAll_, ifM, toChunks, whenM, ($>>=), (<$$>))
+import Simplex.Messaging.Util (catchAll_, toChunks, ($>>=))
 import System.Timeout (timeout)
 import UnliftIO (async)
+import UnliftIO.Exception (Exception)
 import qualified UnliftIO.Exception as E
 import UnliftIO.STM

-type SMPClientVar = SessionVar (Either (SMPClientError, Maybe UTCTime) (OwnServer, SMPClient))
+type SMPClientVar = SessionVar (Either SMPClientError SMPClient)

 data SMPClientAgentEvent
  = CAConnected SMPServer
  | CADisconnected SMPServer (Set SMPSub)
+  | CAReconnected SMPServer
  | CAResubscribed SMPServer (NonEmpty SMPSub)
  | CASubError SMPServer (NonEmpty (SMPSub, SMPClientError))

@@ -69,11 +70,9 @@ type SMPSub = (SMPSubParty, QueueId)
 data SMPClientAgentConfig = SMPClientAgentConfig
  { smpCfg :: ProtocolClientConfig SMPVersion,
    reconnectInterval :: RetryInterval,
-    persistErrorInterval :: NominalDiffTime,
    msgQSize :: Natural,
    agentQSize :: Natural,
-    agentSubsBatchSize :: Int,
-    ownServerDomains :: [ByteString]
+    agentSubsBatchSize :: Int
  }

 defaultSMPClientAgentConfig :: SMPClientAgentConfig
@@ -86,128 +85,128 @@ defaultSMPClientAgentConfig =
            increaseAfter = 10 * second,
            maxInterval = 10 * second
          },
-      persistErrorInterval = 30, -- seconds
      msgQSize = 256,
      agentQSize = 256,
-      agentSubsBatchSize = 900,
-      ownServerDomains = []
+      agentSubsBatchSize = 900
    }
  where
    second = 1000000

 data SMPClientAgent = SMPClientAgent
  { agentCfg :: SMPClientAgentConfig,
-    active :: TVar Bool,
-    msgQ :: TBQueue (ServerTransmissionBatch SMPVersion ErrorType BrokerMsg),
+    msgQ :: TBQueue (ServerTransmission SMPVersion BrokerMsg),
    agentQ :: TBQueue SMPClientAgentEvent,
    randomDrg :: TVar ChaChaDRG,
    smpClients :: TMap SMPServer SMPClientVar,
-    smpSessions :: TMap SessionId (OwnServer, SMPClient),
    srvSubs :: TMap SMPServer (TMap SMPSub C.APrivateAuthKey),
    pendingSrvSubs :: TMap SMPServer (TMap SMPSub C.APrivateAuthKey),
-    smpSubWorkers :: TMap SMPServer (SessionVar (Async ())),
+    reconnections :: TVar [Async ()],
+    asyncClients :: TVar [Async ()],
    workerSeq :: TVar Int
  }

-type OwnServer = Bool
+newtype InternalException e = InternalException {unInternalException :: e}
+  deriving (Eq, Show)
+
+instance Exception e => Exception (InternalException e)
+
+instance Exception e => MonadUnliftIO (ExceptT e IO) where
+  {-# INLINE withRunInIO #-}
+  withRunInIO :: ((forall a. ExceptT e IO a -> IO a) -> IO b) -> ExceptT e IO b
+  withRunInIO inner =
+    ExceptT . fmap (first unInternalException) . E.try $
+      withRunInIO $ \run ->
+        inner $ run . (either (E.throwIO . InternalException) pure <=< runExceptT)
+
+-- as MonadUnliftIO instance for IO is `withRunInIO inner = inner id`,
+-- the last two lines could be replaced with:
+-- inner $ either (E.throwIO . InternalException) pure <=< runExceptT
+
+instance Exception e => MonadUnliftIO (ExceptT e (ReaderT r IO)) where
+  {-# INLINE withRunInIO #-}
+  withRunInIO :: ((forall a. ExceptT e (ReaderT r IO) a -> IO a) -> IO b) -> ExceptT e (ReaderT r IO) b
+  withRunInIO inner =
+    withExceptT unInternalException . ExceptT . E.try $
+      withRunInIO $ \run ->
+        inner $ run . (either (E.throwIO . InternalException) pure <=< runExceptT)

 newSMPClientAgent :: SMPClientAgentConfig -> TVar ChaChaDRG -> STM SMPClientAgent
 newSMPClientAgent agentCfg@SMPClientAgentConfig {msgQSize, agentQSize} randomDrg = do
-  active <- newTVar True
  msgQ <- newTBQueue msgQSize
  agentQ <- newTBQueue agentQSize
  smpClients <- TM.empty
-  smpSessions <- TM.empty
  srvSubs <- TM.empty
  pendingSrvSubs <- TM.empty
-  smpSubWorkers <- TM.empty
+  reconnections <- newTVar []
+  asyncClients <- newTVar []
  workerSeq <- newTVar 0
  pure
    SMPClientAgent
      { agentCfg,
-        active,
        msgQ,
        agentQ,
        randomDrg,
        smpClients,
-        smpSessions,
        srvSubs,
        pendingSrvSubs,
-        smpSubWorkers,
+        reconnections,
+        asyncClients,
        workerSeq
      }

-- | Get or create SMP client for SMPServer
 getSMPServerClient' :: SMPClientAgent -> SMPServer -> ExceptT SMPClientError IO SMPClient
-getSMPServerClient' ca srv = snd <$> getSMPServerClient'' ca srv
-{-# INLINE getSMPServerClient' #-}
-
-getSMPServerClient'' :: SMPClientAgent -> SMPServer -> ExceptT SMPClientError IO (OwnServer, SMPClient)
-getSMPServerClient'' ca@SMPClientAgent {agentCfg, smpClients, smpSessions, workerSeq} srv = do
-  ts <- liftIO getCurrentTime
-  atomically (getClientVar ts) >>= either (ExceptT . newSMPClient) waitForSMPClient
+getSMPServerClient' ca@SMPClientAgent {agentCfg, smpClients, msgQ, randomDrg, workerSeq} srv =
+  atomically getClientVar >>= either newSMPClient waitForSMPClient
  where
-    getClientVar :: UTCTime -> STM (Either SMPClientVar SMPClientVar)
+    getClientVar :: STM (Either SMPClientVar SMPClientVar)
    getClientVar = getSessVar workerSeq srv smpClients

-    waitForSMPClient :: SMPClientVar -> ExceptT SMPClientError IO (OwnServer, SMPClient)
+    waitForSMPClient :: SMPClientVar -> ExceptT SMPClientError IO SMPClient
    waitForSMPClient v = do
      let ProtocolClientConfig {networkConfig = NetworkConfig {tcpConnectTimeout}} = smpCfg agentCfg
      smpClient_ <- liftIO $ tcpConnectTimeout `timeout` atomically (readTMVar $ sessionVar v)
-      case smpClient_ of
-        Just (Right smpClient) -> pure smpClient
-        Just (Left (e, ts_)) -> case ts_ of
-          Nothing -> throwE e
-          Just ts ->
-            ifM
-              ((ts <) <$> liftIO getCurrentTime)
-              (atomically (removeSessVar v srv smpClients) >> getSMPServerClient'' ca srv)
-              (throwE e)
-        Nothing -> throwE PCEResponseTimeout
+      liftEither $ case smpClient_ of
+        Just (Right smpClient) -> Right smpClient
+        Just (Left e) -> Left e
+        Nothing -> Left PCEResponseTimeout

-    newSMPClient :: SMPClientVar -> IO (Either SMPClientError (OwnServer, SMPClient))
-    newSMPClient v = do
-      r <- connectClient ca srv v `E.catch` (pure . Left . PCEIOError)
-      case r of
-        Right smp -> do
-          logInfo . decodeUtf8 $ "Agent connected to " <> showServer srv
-          let c = (isOwnServer ca srv, smp)
-          atomically $ do
-            putTMVar (sessionVar v) (Right c)
-            TM.insert (sessionId $ thParams smp) c smpSessions
-          notify ca $ CAConnected srv
-          pure $ Right c
-        Left e -> do
-          let ei = persistErrorInterval agentCfg
-          if ei == 0
-            then atomically $ do
-              putTMVar (sessionVar v) (Left (e, Nothing))
-              removeSessVar v srv smpClients
-            else do
-              ts <- addUTCTime ei <$> liftIO getCurrentTime
-              atomically $ putTMVar (sessionVar v) (Left (e, Just ts))
-          reconnectClient ca srv
-          pure $ Left e
+    newSMPClient :: SMPClientVar -> ExceptT SMPClientError IO SMPClient
+    newSMPClient v = tryConnectClient pure (liftIO tryConnectAsync)
+      where
+        tryConnectClient :: (SMPClient -> ExceptT SMPClientError IO a) -> ExceptT SMPClientError IO () -> ExceptT SMPClientError IO a
+        tryConnectClient successAction retryAction =
+          tryE (connectClient v) >>= \r -> case r of
+            Right smp -> do
+              logInfo . decodeUtf8 $ "Agent connected to " <> showServer srv
+              atomically $ putTMVar (sessionVar v) r
+              successAction smp
+            Left e -> do
+              if e == PCENetworkError || e == PCEResponseTimeout
+                then retryAction
+                else atomically $ do
+                  putTMVar (sessionVar v) (Left e)
+                  removeSessVar v srv smpClients
+              throwE e
+        tryConnectAsync :: IO ()
+        tryConnectAsync = do
+          a <- async $ void $ runExceptT connectAsync
+          atomically $ modifyTVar' (asyncClients ca) (a :)
+        connectAsync :: ExceptT SMPClientError IO ()
+        connectAsync =
+          withRetryInterval (reconnectInterval agentCfg) $ \_ loop ->
+            void $ tryConnectClient (const reconnectClient) loop

-isOwnServer :: SMPClientAgent -> SMPServer -> OwnServer
-isOwnServer SMPClientAgent {agentCfg} ProtocolServer {host} =
-  let srv = strEncode $ L.head host
-   in any (\s -> s == srv || (B.cons '.' s) `B.isSuffixOf` srv) (ownServerDomains agentCfg)
+    connectClient :: SMPClientVar -> ExceptT SMPClientError IO SMPClient
+    connectClient v = ExceptT $ getProtocolClient randomDrg (1, srv, Nothing) (smpCfg agentCfg) (Just msgQ) (clientDisconnected v)

-- | Run an SMP client for SMPClientVar
-connectClient :: SMPClientAgent -> SMPServer -> SMPClientVar -> IO (Either SMPClientError SMPClient)
-connectClient ca@SMPClientAgent {agentCfg, smpClients, smpSessions, msgQ, randomDrg} srv v =
-  getProtocolClient randomDrg (1, srv, Nothing) (smpCfg agentCfg) (Just msgQ) clientDisconnected
-  where
-    clientDisconnected :: SMPClient -> IO ()
-    clientDisconnected smp = do
-      removeClientAndSubs smp >>= (`forM_` serverDown)
+    clientDisconnected :: SMPClientVar -> SMPClient -> IO ()
+    clientDisconnected v _ = do
+      removeClientAndSubs v >>= (`forM_` serverDown)
      logInfo . decodeUtf8 $ "Agent disconnected from " <> showServer srv

-    removeClientAndSubs :: SMPClient -> IO (Maybe (Map SMPSub C.APrivateAuthKey))
-    removeClientAndSubs smp = atomically $ do
+    removeClientAndSubs :: SMPClientVar -> IO (Maybe (Map SMPSub C.APrivateAuthKey))
+    removeClientAndSubs v = atomically $ do
      removeSessVar v srv smpClients
-      TM.delete (sessionId $ thParams smp) smpSessions
      TM.lookupDelete srv (srvSubs ca) >>= mapM updateSubs
      where
        updateSubs sVar = do
@@ -223,104 +222,67 @@ connectClient ca@SMPClientAgent {agentCfg, smpClients, smpSessions, msgQ, random

    serverDown :: Map SMPSub C.APrivateAuthKey -> IO ()
    serverDown ss = unless (M.null ss) $ do
-      notify ca . CADisconnected srv $ M.keysSet ss
-      reconnectClient ca srv
+      notify . CADisconnected srv $ M.keysSet ss
+      reconnectServer

-- | Spawn reconnect worker if needed
-reconnectClient :: SMPClientAgent -> SMPServer -> IO ()
-reconnectClient ca@SMPClientAgent {active, agentCfg, smpSubWorkers, workerSeq} srv = do
-  ts <- getCurrentTime
-  whenM (readTVarIO active) $ atomically (getWorkerVar ts) >>= mapM_ (either newSubWorker (\_ -> pure ()))
-  where
-    getWorkerVar ts =
-      ifM
-        (null <$> getPending)
-        (pure Nothing) -- prevent race with cleanup and adding pending queues in another call
-        (Just <$> getSessVar workerSeq srv smpSubWorkers ts)
-    newSubWorker :: SessionVar (Async ()) -> IO ()
-    newSubWorker v = do
-      a <- async $ void (E.tryAny runSubWorker) >> atomically (cleanup v)
-      atomically $ putTMVar (sessionVar v) a
-    runSubWorker =
-      withRetryInterval (reconnectInterval agentCfg) $ \_ loop -> do
-        pending <- atomically getPending
-        forM_ pending $ \cs -> whenM (readTVarIO active) $ do
-          void $ tcpConnectTimeout `timeout` runExceptT (reconnectSMPClient ca srv cs)
-          loop
-    ProtocolClientConfig {networkConfig = NetworkConfig {tcpConnectTimeout}} = smpCfg agentCfg
-    getPending = mapM readTVar =<< TM.lookup srv (pendingSrvSubs ca)
-    cleanup :: SessionVar (Async ()) -> STM ()
-    cleanup v = do
-      -- Here we wait until TMVar is not empty to prevent worker cleanup happening before worker is added to TMVar.
-      -- Not waiting may result in terminated worker remaining in the map.
-      whenM (isEmptyTMVar $ sessionVar v) retry
-      removeSessVar v srv smpSubWorkers
+    reconnectServer :: IO ()
+    reconnectServer = do
+      a <- async $ void $ runExceptT tryReconnectClient
+      atomically $ modifyTVar' (reconnections ca) (a :)

-reconnectSMPClient :: SMPClientAgent -> SMPServer -> Map SMPSub C.APrivateAuthKey -> ExceptT SMPClientError IO ()
-reconnectSMPClient ca@SMPClientAgent {agentCfg} srv cs =
-  withSMP ca srv $ \smp -> do
-    subs' <- filterM (fmap not . atomically . hasSub (srvSubs ca) srv . fst) $ M.assocs cs
-    let (nSubs, rSubs) = partition (isNotifier . fst . fst) subs'
-    subscribe_ smp SPNotifier nSubs
-    subscribe_ smp SPRecipient rSubs
-  where
-    isNotifier = \case
-      SPNotifier -> True
-      SPRecipient -> False
-    subscribe_ :: SMPClient -> SMPSubParty -> [(SMPSub, C.APrivateAuthKey)] -> ExceptT SMPClientError IO ()
-    subscribe_ smp party = mapM_ subscribeBatch . toChunks (agentSubsBatchSize agentCfg)
+    tryReconnectClient :: ExceptT SMPClientError IO ()
+    tryReconnectClient = do
+      withRetryInterval (reconnectInterval agentCfg) $ \_ loop ->
+        reconnectClient `catchE` const loop
+
+    reconnectClient :: ExceptT SMPClientError IO ()
+    reconnectClient = do
+      withSMP ca srv $ \smp -> do
+        liftIO $ notify $ CAReconnected srv
+        cs_ <- atomically $ mapM readTVar =<< TM.lookup srv (pendingSrvSubs ca)
+        forM_ cs_ $ \cs -> do
+          subs' <- filterM (fmap not . atomically . hasSub (srvSubs ca) srv . fst) $ M.assocs cs
+          let (nSubs, rSubs) = partition (isNotifier . fst . fst) subs'
+          subscribe_ smp SPNotifier nSubs
+          subscribe_ smp SPRecipient rSubs
      where
-        subscribeBatch subs' = do
-          let subs'' :: (NonEmpty (QueueId, C.APrivateAuthKey)) = L.map (first snd) subs'
-          rs <- liftIO $ smpSubscribeQueues party ca smp srv subs''
-          let rs' :: (NonEmpty ((SMPSub, C.APrivateAuthKey), Either SMPClientError ())) =
-                L.zipWith (first . const) subs' rs
-              rs'' :: [Either (SMPSub, SMPClientError) (SMPSub, C.APrivateAuthKey)] =
-                map (\(sub, r) -> bimap (fst sub,) (const sub) r) $ L.toList rs'
-              (errs, oks) = partitionEithers rs''
-              (tempErrs, finalErrs) = partition (temporaryClientError . snd) errs
-          mapM_ (atomically . addSubscription ca srv) oks
-          mapM_ (notify ca . CAResubscribed srv) $ L.nonEmpty $ map fst oks
-          mapM_ (atomically . removePendingSubscription ca srv . fst) finalErrs
-          mapM_ (notify ca . CASubError srv) $ L.nonEmpty finalErrs
-          mapM_ (throwE . snd) $ listToMaybe tempErrs
+        isNotifier = \case
+          SPNotifier -> True
+          SPRecipient -> False

-notify :: MonadIO m => SMPClientAgent -> SMPClientAgentEvent -> m ()
-notify ca evt = atomically $ writeTBQueue (agentQ ca) evt
-{-# INLINE notify #-}
+        subscribe_ :: SMPClient -> SMPSubParty -> [(SMPSub, C.APrivateAuthKey)] -> ExceptT SMPClientError IO ()
+        subscribe_ smp party = mapM_ subscribeBatch . toChunks (agentSubsBatchSize agentCfg)
+          where
+            subscribeBatch subs' = do
+              let subs'' :: (NonEmpty (QueueId, C.APrivateAuthKey)) = L.map (first snd) subs'
+              rs <- liftIO $ smpSubscribeQueues party ca smp srv subs''
+              let rs' :: (NonEmpty ((SMPSub, C.APrivateAuthKey), Either SMPClientError ())) =
+                    L.zipWith (first . const) subs' rs
+                  rs'' :: [Either (SMPSub, SMPClientError) (SMPSub, C.APrivateAuthKey)] =
+                    map (\(sub, r) -> bimap (fst sub,) (const sub) r) $ L.toList rs'
+                  (errs, oks) = partitionEithers rs''
+                  (tempErrs, finalErrs) = partition (temporaryClientError . snd) errs
+              mapM_ (atomically . addSubscription ca srv) oks
+              mapM_ (liftIO . notify . CAResubscribed srv) $ L.nonEmpty $ map fst oks
+              mapM_ (atomically . removePendingSubscription ca srv . fst) finalErrs
+              mapM_ (liftIO . notify . CASubError srv) $ L.nonEmpty finalErrs
+              mapM_ (throwE . snd) $ listToMaybe tempErrs

-- Returns already connected client for proxying messages or Nothing if client is absent, not connected yet or stores expired error.
-- If Nothing is return proxy will spawn a new thread to wait or to create another client connection to destination relay.
-getConnectedSMPServerClient :: SMPClientAgent -> SMPServer -> IO (Maybe (Either SMPClientError (OwnServer, SMPClient)))
-getConnectedSMPServerClient SMPClientAgent {smpClients} srv =
-  atomically (TM.lookup srv smpClients $>>= \v -> (v,) <$$> tryReadTMVar (sessionVar v)) -- Nothing: client is absent or not connected yet
-    $>>= \case
-      (_, Right r) -> pure $ Just $ Right r
-      (v, Left (e, ts_)) ->
-        pure ts_ $>>= \ts ->  -- proxy will create a new connection if ts_ is Nothing
-          ifM
-            ((ts <) <$> liftIO getCurrentTime) -- error persistence interval period expired?
-            (Nothing <$ atomically (removeSessVar v srv smpClients)) -- proxy will create a new connection
-            (pure $ Just $ Left e) -- not expired, returning error
-
-lookupSMPServerClient :: SMPClientAgent -> SessionId -> STM (Maybe (OwnServer, SMPClient))
-lookupSMPServerClient SMPClientAgent {smpSessions} sessId = TM.lookup sessId smpSessions
+    notify :: SMPClientAgentEvent -> IO ()
+    notify evt = atomically $ writeTBQueue (agentQ ca) evt

 closeSMPClientAgent :: SMPClientAgent -> IO ()
 closeSMPClientAgent c = do
-  atomically $ writeTVar (active c) False
  closeSMPServerClients c
-  atomically (swapTVar (smpSubWorkers c) M.empty) >>= mapM_ cancelReconnect
-  where
-    cancelReconnect :: SessionVar (Async ()) -> IO ()
-    cancelReconnect v = void . forkIO $ atomically (readTMVar $ sessionVar v) >>= uninterruptibleCancel
+  cancelActions $ reconnections c
+  cancelActions $ asyncClients c

 closeSMPServerClients :: SMPClientAgent -> IO ()
 closeSMPServerClients c = atomically (smpClients c `swapTVar` M.empty) >>= mapM_ (forkIO . closeClient)
  where
    closeClient v =
      atomically (readTMVar $ sessionVar v) >>= \case
-        Right (_, smp) -> closeProtocolClient smp `catchAll_` pure ()
+        Right smp -> closeProtocolClient smp `catchAll_` pure ()
        _ -> pure ()

 cancelActions :: Foldable f => TVar (f (Async ())) -> IO ()
@@ -141,7 +141,6 @@ module Simplex.Messaging.Crypto
    sbEncrypt_,
    cbNonce,
    randomCbNonce,
-    reverseNonce,

    -- * NaCl crypto_secretbox
    SbKey (unSbKey),
@@ -757,8 +756,6 @@ data Signature (a :: Algorithm) where
  SignatureEd25519 :: Ed25519.Signature -> Signature Ed25519
  SignatureEd448 :: Ed448.Signature -> Signature Ed448

-deriving instance Eq (Signature a)
-
 deriving instance Show (Signature a)

 data ASignature
@@ -1293,9 +1290,6 @@ randomCbNonce = fmap CryptoBoxNonce . randomBytes 24
 randomBytes :: Int -> TVar ChaChaDRG -> STM ByteString
 randomBytes n gVar = stateTVar gVar $ randomBytesGenerate n

-reverseNonce :: CbNonce -> CbNonce
-reverseNonce (CryptoBoxNonce s) = CryptoBoxNonce (B.reverse s)
-
 instance Encoding CbNonce where
  smpEncode = unCbNonce
  smpP = CryptoBoxNonce <$> A.take 24
@@ -23,7 +23,6 @@ where
 import Control.Exception
 import Control.Monad
 import Control.Monad.Except
-import Control.Monad.Trans.Except
 import Crypto.Random (ChaChaDRG)
 import qualified Data.Aeson.TH as J
 import qualified Data.ByteArray as BA
@@ -32,6 +31,7 @@ import qualified Data.ByteString.Char8 as B
 import qualified Data.ByteString.Lazy as LB
 import Data.List.NonEmpty (NonEmpty (..))
 import Data.Maybe (isJust)
+import Simplex.Messaging.Client.Agent ()
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Crypto.Lazy (LazyByteString)
 import qualified Simplex.Messaging.Crypto.Lazy as LC
@@ -57,10 +57,10 @@ readFile (CryptoFile path cfArgs) = do
  case cfArgs of
    Just (CFArgs (C.SbKey key) (C.CbNonce nonce)) -> do
      let len = LB.length s - fromIntegral C.authTagSize
-      when (len < 0) $ throwE FTCEInvalidFileSize
+      when (len < 0) $ throwError FTCEInvalidFileSize
      let (s', tag') = LB.splitAt len s
      (tag :| cs) <- liftEitherWith FTCECryptoError $ LC.secretBox LC.sbDecryptChunk key nonce s'
-      unless (BA.constEq (LB.toStrict tag') tag) $ throwE FTCEInvalidAuthTag
+      unless (BA.constEq (LB.toStrict tag') tag) $ throwError FTCEInvalidAuthTag
      pure $ LB.fromChunks cs
    Nothing -> pure s

@@ -97,7 +97,7 @@ hGetTag :: CryptoFileHandle -> ExceptT FTCryptoError IO ()
 hGetTag (CFHandle h sb_) = forM_ sb_ $ \sb -> do
  tag <- liftIO $ B.hGet h C.authTagSize
  tag' <- LC.sbAuth <$> readTVarIO sb
-  unless (BA.constEq tag tag') $ throwE FTCEInvalidAuthTag
+  unless (BA.constEq tag tag') $ throwError FTCEInvalidAuthTag

 data FTCryptoError
  = FTCECryptoError C.CryptoError
@@ -117,7 +117,7 @@ import Simplex.Messaging.Crypto.SNTRUP761.Bindings
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers (blobFieldDecoder, defaultJSON, parseE, parseE')
-import Simplex.Messaging.Util (($>>=), (<$?>))
+import Simplex.Messaging.Util ((<$?>), ($>>=))
 import Simplex.Messaging.Version
 import Simplex.Messaging.Version.Internal
 import UnliftIO.STM
@@ -166,9 +166,9 @@ instance TestEquality SRatchetKEMState where

 class RatchetKEMStateI (s :: RatchetKEMState) where sRatchetKEMState :: SRatchetKEMState s

-instance RatchetKEMStateI 'RKSProposed where sRatchetKEMState = SRKSProposed
+instance RatchetKEMStateI RKSProposed where sRatchetKEMState = SRKSProposed

-instance RatchetKEMStateI 'RKSAccepted where sRatchetKEMState = SRKSAccepted
+instance RatchetKEMStateI RKSAccepted where sRatchetKEMState = SRKSAccepted

 checkRatchetKEMState :: forall t s s' a. (RatchetKEMStateI s, RatchetKEMStateI s') => t s' a -> Either String (t s a)
 checkRatchetKEMState x = case testEquality (sRatchetKEMState @s) (sRatchetKEMState @s') of
@@ -266,7 +266,6 @@ instance VersionRangeI E2EVersion (E2ERatchetParamsUri s a) where
  type VersionT E2EVersion (E2ERatchetParamsUri s a) = (E2ERatchetParams s a)
  versionRange (E2ERatchetParamsUri vr _ _ _) = vr
  toVersionT (E2ERatchetParamsUri _ k1 k2 kem_) v = E2ERatchetParams v k1 k2 kem_
-  toVersionRange (E2ERatchetParamsUri _ k1 k2 kem_) vr = E2ERatchetParamsUri vr k1 k2 kem_

 type RcvE2ERatchetParamsUri a = E2ERatchetParamsUri 'RKSProposed a

@@ -378,15 +377,13 @@ generateE2EParams g v useKEM_ = do
  where
    kemParams :: IO (Maybe (RKEMParams s, PrivRKEMParams s))
    kemParams = case useKEM_ of
-      Just useKem
-        | v >= pqRatchetE2EEncryptVersion ->
-            Just <$> do
-              ks@(k, _) <- sntrup761Keypair g
-              case useKem of
-                ProposeKEM -> pure (RKParamsProposed k, PrivateRKParamsProposed ks)
-                AcceptKEM k' -> do
-                  (ct, shared) <- sntrup761Enc g k'
-                  pure (RKParamsAccepted ct k, PrivateRKParamsAccepted ct shared ks)
+      Just useKem | v >= pqRatchetE2EEncryptVersion -> Just <$> do
+        ks@(k, _) <- sntrup761Keypair g
+        case useKem of
+          ProposeKEM -> pure (RKParamsProposed k, PrivateRKParamsProposed ks)
+          AcceptKEM k' -> do
+            (ct, shared) <- sntrup761Enc g k'
+            pure (RKParamsAccepted ct k, PrivateRKParamsAccepted ct shared ks)
      _ -> pure Nothing

 -- used by party initiating connection, Bob in double-ratchet spec
@@ -447,7 +444,7 @@ pqX3dhRcv rpk1 rpk2 rpKem_ (E2ERatchetParams v sk1 sk2 sKem_) = do
        Just (PrivateRKParamsProposed ks@(_, pk)) -> do
          shared <- liftIO $ sntrup761Dec ct pk
          pure $ Just (ks, RatchetKEMAccepted k' shared ct)
-        Nothing -> throwE CERatchetKEMState
+        Nothing -> throwError CERatchetKEMState
      _ -> pure Nothing -- both parties can send "proposal" in case of ratchet renegotiation

 pqX3dh :: DhAlgorithm a => (PublicKey a, PublicKey a) -> DhSecret a -> DhSecret a -> DhSecret a -> Maybe RatchetKEMAccepted -> RatchetInitParams
@@ -459,7 +456,7 @@ pqX3dh (sk1, rk1) dh1 dh2 dh3 kemAccepted =
    pq = maybe "" (\RatchetKEMAccepted {rcPQRss = KEMSharedKey ss} -> BA.convert ss) kemAccepted
    (hk, nhk, sk) =
      let salt = B.replicate 64 '\0'
-       in hkdf3 salt dhs "SimpleXX3DH"
+        in hkdf3 salt dhs "SimpleXX3DH"

 type RatchetX448 = Ratchet 'X448

@@ -701,8 +698,8 @@ data EncMessageHeader = EncMessageHeader

 -- this encoding depends on version in EncMessageHeader because it is "current" ratchet version
 instance Encoding EncMessageHeader where
-  smpEncode EncMessageHeader {ehVersion, ehIV, ehAuthTag, ehBody} =
-    smpEncode (ehVersion, ehIV, ehAuthTag) <> encodeLarge ehVersion ehBody
+  smpEncode EncMessageHeader {ehVersion, ehIV, ehAuthTag, ehBody}
+    = smpEncode (ehVersion, ehIV, ehAuthTag) <> encodeLarge ehVersion ehBody
  smpP = do
    (ehVersion, ehIV, ehAuthTag) <- smpP
    ehBody <- largeP
@@ -711,6 +708,8 @@ instance Encoding EncMessageHeader where
 -- the encoder always uses 2-byte lengths for the new version, even for short headers without PQ keys.
 encodeLarge :: VersionE2E -> ByteString -> ByteString
 encodeLarge v s
+  -- the condition for length is not necessary, it's here as a fallback.
+  -- | v >= pqRatchetE2EEncryptVersion || B.length s > 255 = smpEncode $ Large s
  | v >= pqRatchetE2EEncryptVersion = smpEncode $ Large s
  | otherwise = smpEncode s

@@ -730,8 +729,8 @@ data EncRatchetMessage = EncRatchetMessage
  }

 encodeEncRatchetMessage :: VersionE2E -> EncRatchetMessage -> ByteString
-encodeEncRatchetMessage v EncRatchetMessage {emHeader, emBody, emAuthTag} =
-  encodeLarge v emHeader <> smpEncode (emAuthTag, Tail emBody)
+encodeEncRatchetMessage v EncRatchetMessage {emHeader, emBody, emAuthTag}
+  = encodeLarge v emHeader <> smpEncode (emAuthTag, Tail emBody)

 encRatchetMessageP :: Parser EncRatchetMessage
 encRatchetMessageP = do
@@ -75,8 +75,6 @@ instance StrEncoding Str where
  strEncode = unStr
  strP = Str <$> A.takeTill (== ' ') <* optional A.space

-- inherited from ByteString, the parser only allows non-empty strings
-- only Char8 elements may round-trip as B.pack truncates unicode
 instance StrEncoding String where
  strEncode = strEncode . B.pack
  strP = B.unpack <$> strP
@@ -12,6 +12,7 @@ import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Notifications.Protocol
 import Simplex.Messaging.Notifications.Transport (NTFVersion, supportedClientNTFVRange, supportedNTFHandshakes)
 import Simplex.Messaging.Protocol (ErrorType)
+import Simplex.Messaging.Util (bshow)

 type NtfClient = ProtocolClient NTFVersion ErrorType NtfResponse

@@ -24,7 +25,7 @@ ntfRegisterToken :: NtfClient -> C.APrivateAuthKey -> NewNtfEntity 'Token -> Exc
 ntfRegisterToken c pKey newTkn =
  sendNtfCommand c (Just pKey) "" (TNEW newTkn) >>= \case
    NRTknId tknId dhKey -> pure (tknId, dhKey)
-    r -> throwE $ unexpectedResponse r
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 ntfVerifyToken :: NtfClient -> C.APrivateAuthKey -> NtfTokenId -> NtfRegCode -> ExceptT NtfClientError IO ()
 ntfVerifyToken c pKey tknId code = okNtfCommand (TVFY code) c pKey tknId
@@ -33,7 +34,7 @@ ntfCheckToken :: NtfClient -> C.APrivateAuthKey -> NtfTokenId -> ExceptT NtfClie
 ntfCheckToken c pKey tknId =
  sendNtfCommand c (Just pKey) tknId TCHK >>= \case
    NRTkn stat -> pure stat
-    r -> throwE $ unexpectedResponse r
+    r -> throwE . PCEUnexpectedResponse $ bshow r

 ntfReplaceToken :: NtfClient -> C.APrivateAuthKey -> NtfTokenId -> DeviceToken -> ExceptT NtfClientError IO ()
 ntfReplaceToken c pKey tknId token = okNtfCommand (TRPL token) c pKey tknId
@@ -48,13 +49,13 @@ ntfCreateSubscription :: NtfClient -> C.APrivateAuthKey -> NewNtfEntity 'Subscri
 ntfCreateSubscription c pKey newSub =
  sendNtfCommand c (Just pKey) "" (SNEW newSub) >>= \case
    NRSubId subId -> pure subId
-    r -> throwE $ unexpectedResponse r
+    r -> throwE . PCEUnexpectedResponse $ bshow r

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

 ntfDeleteSubscription :: NtfClient -> C.APrivateAuthKey -> NtfSubscriptionId -> ExceptT NtfClientError IO ()
 ntfDeleteSubscription = okNtfCommand SDEL
@@ -67,4 +68,4 @@ okNtfCommand :: NtfEntityI e => NtfCommand e -> NtfClient -> C.APrivateAuthKey -
 okNtfCommand cmd c pKey entId =
  sendNtfCommand c (Just pKey) entId cmd >>= \case
    NROk -> return ()
-    r -> throwE $ unexpectedResponse r
+    r -> throwE . PCEUnexpectedResponse $ bshow r
@@ -31,7 +31,7 @@ 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 (..), SMPClientError, ServerTransmission (..))
+import Simplex.Messaging.Client (ProtocolClientError (..), SMPClientError)
 import Simplex.Messaging.Client.Agent
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding.String
@@ -98,9 +98,7 @@ ntfServer cfg@NtfServerConfig {transports, transportConfig = tCfg} started = do
    stopServer = do
      withNtfLog closeStoreLog
      saveServerStats
-      NtfSubscriber {smpSubscribers, smpAgent} <- asks subscriber
-      liftIO $ readTVarIO smpSubscribers >>= mapM_ (\SMPSubscriber {subThreadId} -> readTVarIO subThreadId >>= mapM_ (deRefWeak >=> mapM_ killThread))
-      liftIO $ closeSMPClientAgent smpAgent
+      asks (smpSubscribers . subscriber) >>= readTVarIO >>= mapM_ (\SMPSubscriber {subThreadId} -> readTVarIO subThreadId >>= mapM_ (liftIO . deRefWeak >=> mapM_ killThread))

    serverStatsThread_ :: NtfServerConfig -> [M ()]
    serverStatsThread_ NtfServerConfig {logStatsInterval = Just interval, logStatsStartTime, serverStatsLogFile} =
@@ -220,38 +218,33 @@ ntfSubscriber NtfSubscriber {smpSubscribers, newSubQ, smpAgent = ca@SMPClientAge

    receiveSMP :: M ()
    receiveSMP = forever $ do
-      ((_, srv, _), _, _, ts) <- atomically $ readTBQueue msgQ
-      forM ts $ \(ntfId, t) -> case t of
-        STUnexpectedError e -> logError $ "SMP client unexpected error: " <> tshow e -- uncorrelated response, should not happen
-        STResponse {} -> pure () -- it was already reported as timeout error
-        STEvent msgOrErr -> do
-          let smpQueue = SMPQueueNtf srv ntfId
-          case msgOrErr of
-            Right (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
-            Right SMP.END -> updateSubStatus smpQueue NSEnd
-            Right (SMP.ERR e) -> logError $ "SMP server error: " <> tshow e
-            Right _ -> logError $ "SMP server unexpected response"
-            Left e -> logError $ "SMP client error: " <> tshow e
+      ((_, srv, _), _, _, _, ntfId, msg) <- atomically $ readTBQueue msgQ
+      let smpQueue = SMPQueueNtf srv ntfId
+      case msg of
+        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 ()

    receiveAgent =
      forever $
        atomically (readTBQueue agentQ) >>= \case
-          CAConnected srv ->
-            logInfo $ "SMP server reconnected " <> showServer' srv
+          CAConnected _ -> pure ()
          CADisconnected srv subs -> do
            logSubStatus srv "disconnected" $ length subs
            forM_ subs $ \(_, ntfId) -> do
              let smpQueue = SMPQueueNtf srv ntfId
              updateSubStatus smpQueue NSInactive
+          CAReconnected srv ->
+            logInfo $ "SMP server reconnected " <> showServer' srv
          CAResubscribed srv subs -> do
            forM_ subs $ \(_, ntfId) -> updateSubStatus (SMPQueueNtf srv ntfId) NSActive
            logSubStatus srv "resubscribed" $ length subs
@@ -11,10 +11,9 @@ import Data.Functor (($>))
 import Data.Ini (lookupValue, readIniFile)
 import Data.Maybe (fromMaybe)
 import qualified Data.Text as T
-import qualified Data.Text.IO as T
 import Network.Socket (HostName)
 import Options.Applicative
-import Simplex.Messaging.Client.Agent (SMPClientAgentConfig (..), defaultSMPClientAgentConfig)
+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 (..), defaultInactiveClientExpiration)
@@ -26,7 +25,6 @@ import Simplex.Messaging.Server.Expiration
 import Simplex.Messaging.Transport (simplexMQVersion)
 import Simplex.Messaging.Transport.Client (TransportHost (..))
 import Simplex.Messaging.Transport.Server (TransportServerConfig (..), defaultTransportServerConfig)
-import Simplex.Messaging.Util (tshow)
 import System.Directory (createDirectoryIfMissing, doesFileExist)
 import System.FilePath (combine)
 import System.IO (BufferMode (..), hSetBuffering, stderr, stdout)
@@ -67,7 +65,7 @@ ntfServerCLI cfgPath logPath =
      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
-      T.writeFile iniFile $ iniFileContent host
+      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
@@ -83,15 +81,15 @@ ntfServerCLI cfgPath logPath =
            <> "log_stats: off\n\n\
               \[TRANSPORT]\n\
               \# host is only used to print server address on start\n"
-            <> ("host: " <> T.pack host <> "\n")
-            <> ("port: " <> T.pack defaultServerPort <> "\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: " <> tshow (ttl defaultInactiveClientExpiration) <> "\n")
-            <> ("# check_interval: " <> tshow (checkInterval defaultInactiveClientExpiration) <> "\n")
+            <> ("# ttl: " <> show (ttl defaultInactiveClientExpiration) <> "\n")
+            <> ("# check_interval: " <> show (checkInterval defaultInactiveClientExpiration) <> "\n")
    runServer ini = do
      hSetBuffering stdout LineBuffering
      hSetBuffering stderr LineBuffering
@@ -115,7 +113,7 @@ ntfServerCLI cfgPath logPath =
              clientQSize = 64,
              subQSize = 512,
              pushQSize = 1048,
-              smpAgentCfg = defaultSMPClientAgentConfig {persistErrorInterval = 0},
+              smpAgentCfg = defaultSMPClientAgentConfig,
              apnsConfig = defaultAPNSPushClientConfig,
              subsBatchSize = 900,
              inactiveClientExpiration =
@@ -15,7 +15,6 @@ import Control.Logger.Simple
 import Control.Monad
 import Control.Monad.Except
 import Control.Monad.IO.Class
-import Control.Monad.Trans.Except
 import Crypto.Hash.Algorithms (SHA256 (..))
 import qualified Crypto.PubKey.ECC.ECDSA as EC
 import qualified Crypto.PubKey.ECC.Types as ECT
@@ -354,18 +353,18 @@ apnsPushProviderClient c@APNSPushClient {nonceDrg, apnsCfg} tkn@NtfTknData {toke
      | status == Just N.ok200 = pure ()
      | status == Just N.badRequest400 =
          case reason' of
-            "BadDeviceToken" -> throwE PPTokenInvalid
-            "DeviceTokenNotForTopic" -> throwE PPTokenInvalid
-            "TopicDisallowed" -> throwE PPPermanentError
+            "BadDeviceToken" -> throwError PPTokenInvalid
+            "DeviceTokenNotForTopic" -> throwError PPTokenInvalid
+            "TopicDisallowed" -> throwError PPPermanentError
            _ -> err status reason'
      | status == Just N.forbidden403 = case reason' of
-          "ExpiredProviderToken" -> throwE PPPermanentError -- there should be no point retrying it as the token was refreshed
-          "InvalidProviderToken" -> throwE PPPermanentError
+          "ExpiredProviderToken" -> throwError PPPermanentError -- there should be no point retrying it as the token was refreshed
+          "InvalidProviderToken" -> throwError PPPermanentError
          _ -> err status reason'
-      | status == Just N.gone410 = throwE PPTokenInvalid
-      | status == Just N.serviceUnavailable503 = liftIO (disconnectApnsHTTP2Client c) >> throwE PPRetryLater
+      | status == Just N.gone410 = throwError PPTokenInvalid
+      | status == Just N.serviceUnavailable503 = liftIO (disconnectApnsHTTP2Client c) >> throwError PPRetryLater
      -- Just tooManyRequests429 -> TooManyRequests - too many requests for the same token
      | otherwise = err status reason'
    err :: Maybe Status -> Text -> ExceptT PushProviderError IO ()
-    err s r = throwE $ PPResponseError s r
+    err s r = throwError $ PPResponseError s r
    liftHTTPS2 a = ExceptT $ first PPConnection <$> a
@@ -11,7 +11,6 @@ module Simplex.Messaging.Notifications.Transport where

 import Control.Monad (forM)
 import Control.Monad.Except
-import Control.Monad.Trans.Except
 import Data.Attoparsec.ByteString.Char8 (Parser)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
@@ -116,11 +115,10 @@ ntfServerHandshake serverSignKey c (k, pk) kh ntfVRange = do
  getHandshake th >>= \case
    NtfClientHandshake {ntfVersion = v, keyHash}
      | keyHash /= kh ->
-          throwE $ TEHandshake IDENTITY
-      | otherwise ->
-          case compatibleVRange' ntfVersionRange v of
-            Just (Compatible vr) -> pure $ ntfThHandleServer th v vr pk
-            Nothing -> throwE TEVersion
+          throwError $ TEHandshake IDENTITY
+      | v `isCompatible` ntfVersionRange ->
+          pure $ ntfThHandleServer th v pk
+      | otherwise -> throwError $ TEHandshake VERSION

 -- | Notifcations server client transport handshake.
 ntfClientHandshake :: forall c. Transport c => c -> C.KeyHash -> VersionRangeNTF -> ExceptT TransportError IO (THandleNTF c 'TClient)
@@ -128,46 +126,35 @@ ntfClientHandshake c keyHash ntfVRange = do
  let th@THandle {params = THandleParams {sessionId}} = ntfTHandle c
  NtfServerHandshake {sessionId = sessId, ntfVersionRange, authPubKey = sk'} <- getHandshake th
  if sessionId /= sessId
-    then throwE TEBadSession
-    else case ntfVersionRange `compatibleVRange` ntfVRange of
-      Just (Compatible vr) -> do
+    then throwError TEBadSession
+    else case ntfVersionRange `compatibleVersion` ntfVRange of
+      Just (Compatible v) -> do
        ck_ <- forM sk' $ \signedKey -> liftEitherWith (const $ TEHandshake BAD_AUTH) $ do
          serverKey <- getServerVerifyKey c
          pubKey <- C.verifyX509 serverKey signedKey
          (,(getServerCerts c, signedKey)) <$> (C.x509ToPublic (pubKey, []) >>= C.pubKey)
-        let v = maxVersion vr
        sendHandshake th $ NtfClientHandshake {ntfVersion = v, keyHash}
-        pure $ ntfThHandleClient th v vr ck_
-      Nothing -> throwE TEVersion
+        pure $ ntfThHandleClient th v ck_
+      Nothing -> throwError $ TEHandshake VERSION

-ntfThHandleServer :: forall c. THandleNTF c 'TServer -> VersionNTF -> VersionRangeNTF -> C.PrivateKeyX25519 -> THandleNTF c 'TServer
-ntfThHandleServer th v vr pk =
+ntfThHandleServer :: forall c. THandleNTF c 'TServer -> VersionNTF -> C.PrivateKeyX25519 -> THandleNTF c 'TServer
+ntfThHandleServer th v pk =
  let thAuth = THAuthServer {serverPrivKey = pk, sessSecret' = Nothing}
-   in ntfThHandle_ th v vr (Just thAuth)
+   in ntfThHandle_ th v (Just thAuth)

-ntfThHandleClient :: forall c. THandleNTF c 'TClient -> VersionNTF -> VersionRangeNTF -> Maybe (C.PublicKeyX25519, (X.CertificateChain, X.SignedExact X.PubKey)) -> THandleNTF c 'TClient
-ntfThHandleClient th v vr ck_ =
+ntfThHandleClient :: forall c. THandleNTF c 'TClient -> VersionNTF -> Maybe (C.PublicKeyX25519, (X.CertificateChain, X.SignedExact X.PubKey)) -> THandleNTF c 'TClient
+ntfThHandleClient th v ck_ =
  let thAuth = (\(k, ck) -> THAuthClient {serverPeerPubKey = k, serverCertKey = ck, sessSecret = Nothing}) <$> ck_
-   in ntfThHandle_ th v vr thAuth
+   in ntfThHandle_ th v thAuth

-ntfThHandle_ :: forall c p. THandleNTF c p -> VersionNTF -> VersionRangeNTF -> Maybe (THandleAuth p) -> THandleNTF c p
-ntfThHandle_ th@THandle {params} v vr thAuth =
+ntfThHandle_ :: forall c p. THandleNTF c p -> VersionNTF -> Maybe (THandleAuth p) -> THandleNTF c p
+ntfThHandle_ th@THandle {params} v thAuth =
  -- TODO drop SMP v6: make thAuth non-optional
  let v3 = v >= authBatchCmdsNTFVersion
-      params' = params {thVersion = v, thServerVRange = vr, thAuth, implySessId = v3, batch = v3}
+      params' = params {thVersion = v, thAuth, implySessId = v3, batch = v3}
   in (th :: THandleNTF c p) {params = params'}

 ntfTHandle :: Transport c => c -> THandleNTF c p
 ntfTHandle c = THandle {connection = c, params}
  where
-    v = VersionNTF 0
-    params =
-      THandleParams
-        { sessionId = tlsUnique c,
-          blockSize = ntfBlockSize,
-          thVersion = v,
-          thServerVRange = versionToRange v,
-          thAuth = Nothing,
-          implySessId = False,
-          batch = False
-        }
+    params = THandleParams {sessionId = tlsUnique c, blockSize = ntfBlockSize, thVersion = VersionNTF 0, thAuth = Nothing, implySessId = False, batch = False}
@@ -24,7 +24,7 @@ import Database.SQLite.Simple (ResultError (..), SQLData (..))
 import Database.SQLite.Simple.FromField (FieldParser, returnError)
 import Database.SQLite.Simple.Internal (Field (..))
 import Database.SQLite.Simple.Ok (Ok (Ok))
-import Simplex.Messaging.Util (safeDecodeUtf8, (<$?>))
+import Simplex.Messaging.Util ((<$?>))
 import Text.Read (readMaybe)

 base64P :: Parser ByteString
@@ -154,6 +154,3 @@ singleFieldJSON_ objectTag tagModifier =

 defaultJSON :: J.Options
 defaultJSON = J.defaultOptions {J.omitNothingFields = True}
-
-textP :: Parser String
-textP = T.unpack . safeDecodeUtf8 <$> A.takeByteString
@@ -43,7 +43,6 @@ module Simplex.Messaging.Protocol
  ( -- * SMP protocol parameters
    supportedSMPClientVRange,
    maxMessageLength,
-    paddedProxiedMsgLength,
    e2eEncConfirmationLength,
    e2eEncMessageLength,

@@ -57,7 +56,6 @@ module Simplex.Messaging.Protocol
    SubscriptionMode (..),
    Party (..),
    Cmd (..),
-    DirectParty,
    BrokerMsg (..),
    SParty (..),
    PartyI (..),
@@ -65,8 +63,6 @@ module Simplex.Messaging.Protocol
    ProtocolErrorType (..),
    ErrorType (..),
    CommandError (..),
-    ProxyError (..),
-    BrokerErrorType (..),
    Transmission,
    TransmissionAuth (..),
    SignedTransmission,
@@ -125,12 +121,6 @@ module Simplex.Messaging.Protocol
    EncNMsgMeta,
    SMPMsgMeta (..),
    NMsgMeta (..),
-    EncFwdResponse (..),
-    EncFwdTransmission (..),
-    EncResponse (..),
-    EncTransmission (..),
-    FwdResponse (..),
-    FwdTransmission (..),
    MsgFlags (..),
    initialSMPClientVersion,
    userProtocol,
@@ -156,7 +146,6 @@ module Simplex.Messaging.Protocol
    sameSrvAddr,
    sameSrvAddr',
    noAuthSrv,
-    toMsgInfo,

    -- * TCP transport functions
    TransportBatch (..),
@@ -178,7 +167,6 @@ module Simplex.Messaging.Protocol
 where

 import Control.Applicative (optional, (<|>))
-import Control.Exception (Exception)
 import Control.Monad
 import Control.Monad.Except
 import Data.Aeson (FromJSON (..), ToJSON (..))
@@ -197,25 +185,19 @@ import Data.List.NonEmpty (NonEmpty (..))
 import qualified Data.List.NonEmpty as L
 import Data.Maybe (isJust, isNothing)
 import Data.String
-import qualified Data.Text as T
-import Data.Text.Encoding (decodeLatin1, encodeUtf8)
-import Data.Time.Clock.System (SystemTime (..), systemToUTCTime)
+import Data.Time.Clock.System (SystemTime (..))
 import Data.Type.Equality
 import Data.Word (Word16)
-import qualified Data.X509 as X
 import GHC.TypeLits (ErrorMessage (..), TypeError, type (+))
-import qualified GHC.TypeLits as TE
-import qualified GHC.TypeLits as Type
 import Network.Socket (ServiceName)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers
-import Simplex.Messaging.Server.QueueStore.QueueInfo
 import Simplex.Messaging.ServiceScheme
 import Simplex.Messaging.Transport
 import Simplex.Messaging.Transport.Client (TransportHost, TransportHosts (..))
-import Simplex.Messaging.Util (bshow, eitherToMaybe, safeDecodeUtf8, (<$?>))
+import Simplex.Messaging.Util (bshow, eitherToMaybe, (<$?>))
 import Simplex.Messaging.Version
 import Simplex.Messaging.Version.Internal

@@ -246,16 +228,9 @@ currentSMPClientVersion = VersionSMPC 2
 supportedSMPClientVRange :: VersionRangeSMPC
 supportedSMPClientVRange = mkVersionRange initialSMPClientVersion currentSMPClientVersion

-- TODO v6.0 remove dependency on version
-maxMessageLength :: VersionSMP -> Int
-maxMessageLength v
-  | v >= sendingProxySMPVersion = 16064 -- max 16067
-  | otherwise = 16088 -- 16064 - always use this size to determine allowed ranges
+maxMessageLength :: Int
+maxMessageLength = 16088

-paddedProxiedMsgLength :: Int
-paddedProxiedMsgLength = 16242 -- 16241 .. 16243
-
-- TODO v6.0 change to 16064
 type MaxMessageLen = 16088

 -- 16 extra bytes: 8 for timestamp and 8 for flags (7 flags and the space, only 1 flag is currently used)
@@ -269,7 +244,7 @@ e2eEncMessageLength :: Int
 e2eEncMessageLength = 16016 -- 16004 .. 16021

 -- | SMP protocol clients
-data Party = Recipient | Sender | Notifier | ProxiedClient
+data Party = Recipient | Sender | Notifier
  deriving (Show)

 -- | Singleton types for SMP protocol clients
@@ -277,13 +252,11 @@ data SParty :: Party -> Type where
  SRecipient :: SParty Recipient
  SSender :: SParty Sender
  SNotifier :: SParty Notifier
-  SProxiedClient :: SParty ProxiedClient

 instance TestEquality SParty where
  testEquality SRecipient SRecipient = Just Refl
  testEquality SSender SSender = Just Refl
  testEquality SNotifier SNotifier = Just Refl
-  testEquality SProxiedClient SProxiedClient = Just Refl
  testEquality _ _ = Nothing

 deriving instance Show (SParty p)
@@ -296,15 +269,6 @@ instance PartyI Sender where sParty = SSender

 instance PartyI Notifier where sParty = SNotifier

-instance PartyI ProxiedClient where sParty = SProxiedClient
-
-type family DirectParty (p :: Party) :: Constraint where
-  DirectParty Recipient = ()
-  DirectParty Sender = ()
-  DirectParty Notifier = ()
-  DirectParty p =
-    (Int ~ Bool, TypeError (Type.Text "Party " :<>: ShowType p :<>: Type.Text " is not direct"))
-
 -- | Type for client command of any participant.
 data Cmd = forall p. PartyI p => Cmd (SParty p) (Command p)

@@ -388,7 +352,6 @@ data Command (p :: Party) where
  ACK :: MsgId -> Command Recipient
  OFF :: Command Recipient
  DEL :: Command Recipient
-  QUE :: Command Recipient
  -- SMP sender commands
  -- SEND v1 has to be supported for encoding/decoding
  -- SEND :: MsgBody -> Command Sender
@@ -396,17 +359,6 @@ data Command (p :: Party) where
  PING :: Command Sender
  -- SMP notification subscriber commands
  NSUB :: Command Notifier
-  PRXY :: SMPServer -> Maybe BasicAuth -> Command ProxiedClient -- request a relay server connection by URI
-  -- Transmission to proxy:
-  -- - entity ID: ID of the session with relay returned in PKEY (response to PRXY)
-  -- - corrId: also used as a nonce to encrypt transmission to relay, corrId + 1 - from relay
-  -- - key (1st param in the command) is used to agree DH secret for this particular transmission and its response
-  -- Encrypted transmission should include session ID (tlsunique) from proxy-relay connection.
-  PFWD :: VersionSMP -> C.PublicKeyX25519 -> EncTransmission -> Command ProxiedClient -- use CorrId as CbNonce, client to proxy
-  -- Transmission forwarded to relay:
-  -- - entity ID: empty
-  -- - corrId: unique correlation ID between proxy and relay, also used as a nonce to encrypt forwarded transmission
-  RFWD :: EncFwdTransmission -> Command Sender -- use CorrId as CbNonce, proxy to relay

 deriving instance Show (Command p)

@@ -432,26 +384,6 @@ instance Encoding SubscriptionMode where
      'C' -> pure SMOnlyCreate
      _ -> fail "bad SubscriptionMode"

-newtype EncTransmission = EncTransmission ByteString
-  deriving (Show)
-
-data FwdTransmission = FwdTransmission
-  { fwdCorrId :: CorrId,
-    fwdVersion :: VersionSMP,
-    fwdKey :: C.PublicKeyX25519,
-    fwdTransmission :: EncTransmission
-  }
-
-instance Encoding FwdTransmission where
-  smpEncode FwdTransmission {fwdCorrId = CorrId corrId, fwdVersion, fwdKey, fwdTransmission = EncTransmission t} =
-    smpEncode (corrId, fwdVersion, fwdKey, Tail t)
-  smpP = do
-    (corrId, fwdVersion, fwdKey, Tail t) <- smpP
-    pure FwdTransmission {fwdCorrId = CorrId corrId, fwdVersion, fwdKey, fwdTransmission = EncTransmission t}
-
-newtype EncFwdTransmission = EncFwdTransmission ByteString
-  deriving (Show)
-
 data BrokerMsg where
  -- SMP broker messages (responses, client messages, notifications)
  IDS :: QueueIdsKeys -> BrokerMsg
@@ -461,12 +393,7 @@ data BrokerMsg where
  MSG :: RcvMessage -> BrokerMsg
  NID :: NotifierId -> RcvNtfPublicDhKey -> BrokerMsg
  NMSG :: C.CbNonce -> EncNMsgMeta -> BrokerMsg
-  -- Should include certificate chain
-  PKEY :: SessionId -> VersionRangeSMP -> (X.CertificateChain, X.SignedExact X.PubKey) -> BrokerMsg -- TLS-signed server key for proxy shared secret and initial sender key
-  RRES :: EncFwdResponse -> BrokerMsg -- relay to proxy
-  PRES :: EncResponse -> BrokerMsg -- proxy to client
  END :: BrokerMsg
-  INFO :: QueueInfo -> BrokerMsg
  OK :: BrokerMsg
  ERR :: ErrorType -> BrokerMsg
  PONG :: BrokerMsg
@@ -478,24 +405,6 @@ data RcvMessage = RcvMessage
  }
  deriving (Eq, Show)

-newtype EncFwdResponse = EncFwdResponse ByteString
-  deriving (Eq, Show)
-
-data FwdResponse = FwdResponse
-  { fwdCorrId :: CorrId,
-    fwdResponse :: EncResponse
-  }
-
-instance Encoding FwdResponse where
-  smpEncode FwdResponse {fwdCorrId = CorrId corrId, fwdResponse = EncResponse t} =
-    smpEncode (corrId, Tail t)
-  smpP = do
-    (corrId, Tail t) <- smpP
-    pure FwdResponse {fwdCorrId = CorrId corrId, fwdResponse = EncResponse t}
-
-newtype EncResponse = EncResponse ByteString
-  deriving (Eq, Show)
-
 -- | received message without server/recipient encryption
 data Message
  = Message
@@ -509,13 +418,6 @@ data Message
        msgTs :: SystemTime
      }

-toMsgInfo :: Message -> MsgInfo
-toMsgInfo = \case
-  Message {msgId, msgTs} -> msgInfo msgId msgTs MTMessage
-  MessageQuota {msgId, msgTs} -> msgInfo msgId msgTs MTQuota
-  where
-    msgInfo msgId msgTs msgType = MsgInfo {msgId = decodeLatin1 $ B64.encode msgId, msgTs = systemToUTCTime msgTs, msgType}
-
 messageId :: Message -> MsgId
 messageId = \case
  Message {msgId} -> msgId
@@ -663,12 +565,8 @@ data CommandTag (p :: Party) where
  ACK_ :: CommandTag Recipient
  OFF_ :: CommandTag Recipient
  DEL_ :: CommandTag Recipient
-  QUE_ :: CommandTag Recipient
  SEND_ :: CommandTag Sender
  PING_ :: CommandTag Sender
-  PRXY_ :: CommandTag ProxiedClient
-  PFWD_ :: CommandTag ProxiedClient
-  RFWD_ :: CommandTag Sender
  NSUB_ :: CommandTag Notifier

 data CmdTag = forall p. PartyI p => CT (SParty p) (CommandTag p)
@@ -682,11 +580,7 @@ data BrokerMsgTag
  | MSG_
  | NID_
  | NMSG_
-  | PKEY_
-  | RRES_
-  | PRES_
  | END_
-  | INFO_
  | OK_
  | ERR_
  | PONG_
@@ -711,12 +605,8 @@ instance PartyI p => Encoding (CommandTag p) where
    ACK_ -> "ACK"
    OFF_ -> "OFF"
    DEL_ -> "DEL"
-    QUE_ -> "QUE"
    SEND_ -> "SEND"
    PING_ -> "PING"
-    PRXY_ -> "PRXY"
-    PFWD_ -> "PFWD"
-    RFWD_ -> "RFWD"
    NSUB_ -> "NSUB"
  smpP = messageTagP

@@ -731,12 +621,8 @@ instance ProtocolMsgTag CmdTag where
    "ACK" -> Just $ CT SRecipient ACK_
    "OFF" -> Just $ CT SRecipient OFF_
    "DEL" -> Just $ CT SRecipient DEL_
-    "QUE" -> Just $ CT SRecipient QUE_
    "SEND" -> Just $ CT SSender SEND_
    "PING" -> Just $ CT SSender PING_
-    "PRXY" -> Just $ CT SProxiedClient PRXY_
-    "PFWD" -> Just $ CT SProxiedClient PFWD_
-    "RFWD" -> Just $ CT SSender RFWD_
    "NSUB" -> Just $ CT SNotifier NSUB_
    _ -> Nothing

@@ -753,11 +639,7 @@ instance Encoding BrokerMsgTag where
    MSG_ -> "MSG"
    NID_ -> "NID"
    NMSG_ -> "NMSG"
-    PKEY_ -> "PKEY"
-    RRES_ -> "RRES"
-    PRES_ -> "PRES"
    END_ -> "END"
-    INFO_ -> "INFO"
    OK_ -> "OK"
    ERR_ -> "ERR"
    PONG_ -> "PONG"
@@ -769,11 +651,7 @@ instance ProtocolMsgTag BrokerMsgTag where
    "MSG" -> Just MSG_
    "NID" -> Just NID_
    "NMSG" -> Just NMSG_
-    "PKEY" -> Just PKEY_
-    "RRES" -> Just RRES_
-    "PRES" -> Just PRES_
    "END" -> Just END_
-    "INFO" -> Just INFO_
    "OK" -> Just OK_
    "ERR" -> Just ERR_
    "PONG" -> Just PONG_
@@ -951,7 +829,7 @@ type family UserProtocol (p :: ProtocolType) :: Constraint where
  UserProtocol PSMP = ()
  UserProtocol PXFTP = ()
  UserProtocol a =
-    (Int ~ Bool, TypeError (TE.Text "Servers for protocol " :<>: ShowType a :<>: TE.Text " cannot be configured by the users"))
+    (Int ~ Bool, TypeError (Text "Servers for protocol " :<>: ShowType a :<>: Text " cannot be configured by the users"))

 userProtocol :: SProtocolType p -> Maybe (Dict (UserProtocol p))
 userProtocol = \case
@@ -1160,20 +1038,14 @@ data ErrorType
    SESSION
  | -- | SMP command is unknown or has invalid syntax
    CMD {cmdErr :: CommandError}
-  | -- | error from proxied relay
-    PROXY {proxyErr :: ProxyError}
  | -- | command authorization error - bad signature or non-existing SMP queue
    AUTH
-  | -- | encryption/decryption error in proxy protocol
-    CRYPTO
  | -- | SMP queue capacity is exceeded on the server
    QUOTA
  | -- | ACK command is sent without message to be acknowledged
    NO_MSG
  | -- | sent message is too large (> maxMessageLength = 16088 bytes)
    LARGE_MSG
-  | -- | relay public key is expired
-    EXPIRED
  | -- | internal server error
    INTERNAL
  | -- | used internally, never returned by the server (to be removed)
@@ -1183,12 +1055,8 @@ data ErrorType
 instance StrEncoding ErrorType where
  strEncode = \case
    CMD e -> "CMD " <> bshow e
-    PROXY e -> "PROXY " <> strEncode e
    e -> bshow e
-  strP =
-    "CMD " *> (CMD <$> parseRead1)
-      <|> "PROXY " *> (PROXY <$> strP)
-      <|> parseRead1
+  strP = "CMD " *> (CMD <$> parseRead1) <|> parseRead1

 -- | SMP command error type.
 data CommandError
@@ -1206,34 +1074,6 @@ data CommandError
    NO_ENTITY
  deriving (Eq, Read, Show)

-data ProxyError
-  = -- | Correctly parsed SMP server ERR response.
-    -- This error is forwarded to the agent client as AgentErrorType `ERR PROXY PROTOCOL err`.
-    PROTOCOL {protocolErr :: ErrorType}
-  | -- | destination server error
-    BROKER {brokerErr :: BrokerErrorType}
-  | -- | basic auth provided to proxy is invalid
-    BASIC_AUTH
-  | -- no destination server error
-    NO_SESSION
-  deriving (Eq, Read, Show)
-
-- | SMP server errors.
-data BrokerErrorType
-  = -- | invalid server response (failed to parse)
-    RESPONSE {respErr :: String}
-  | -- | unexpected response
-    UNEXPECTED {respErr :: String}
-  | -- | network error
-    NETWORK
-  | -- | no compatible server host (e.g. onion when public is required, or vice versa)
-    HOST
-  | -- | handshake or other transport error
-    TRANSPORT {transportErr :: TransportError}
-  | -- | command response timeout
-    TIMEOUT
-  deriving (Eq, Read, Show, Exception)
-
 -- | SMP transmission parser.
 transmissionP :: THandleParams v p -> Parser RawTransmission
 transmissionP THandleParams {sessionId, implySessId} = do
@@ -1292,13 +1132,9 @@ instance PartyI p => ProtocolEncoding SMPVersion ErrorType (Command p) where
    ACK msgId -> e (ACK_, ' ', msgId)
    OFF -> e OFF_
    DEL -> e DEL_
-    QUE -> e QUE_
    SEND flags msg -> e (SEND_, ' ', flags, ' ', Tail msg)
    PING -> e PING_
    NSUB -> e NSUB_
-    PRXY host auth_ -> e (PRXY_, ' ', host, auth_)
-    PFWD fwdV pubKey (EncTransmission s) -> e (PFWD_, ' ', fwdV, pubKey, Tail s)
-    RFWD (EncFwdTransmission s) -> e (RFWD_, ' ', Tail s)
    where
      e :: Encoding a => a -> ByteString
      e = smpEncode
@@ -1308,33 +1144,24 @@ instance PartyI p => ProtocolEncoding SMPVersion ErrorType (Command p) where
  fromProtocolError = fromProtocolError @SMPVersion @ErrorType @BrokerMsg
  {-# INLINE fromProtocolError #-}

-  checkCredentials (auth, _, entId, _) cmd = case cmd of
+  checkCredentials (auth, _, queueId, _) cmd = case cmd of
    -- NEW must have signature but NOT queue ID
    NEW {}
      | isNothing auth -> Left $ CMD NO_AUTH
-      | not (B.null entId) -> Left $ CMD HAS_AUTH
+      | not (B.null queueId) -> Left $ CMD HAS_AUTH
      | otherwise -> Right cmd
    -- SEND must have queue ID, signature is not always required
    SEND {}
-      | B.null entId -> Left $ CMD NO_ENTITY
+      | B.null queueId -> Left $ CMD NO_ENTITY
      | otherwise -> Right cmd
-    PING -> noAuthCmd
-    PRXY {} -> noAuthCmd
-    PFWD {}
-      | B.null entId -> Left $ CMD NO_ENTITY
-      | isNothing auth -> Right cmd
+    -- PING must not have queue ID or signature
+    PING
+      | isNothing auth && B.null queueId -> Right cmd
      | otherwise -> Left $ CMD HAS_AUTH
-    RFWD _ -> noAuthCmd
    -- other client commands must have both signature and queue ID
    _
-      | isNothing auth || B.null entId -> Left $ CMD NO_AUTH
+      | isNothing auth || B.null queueId -> Left $ CMD NO_AUTH
      | otherwise -> Right cmd
-    where
-      -- command must not have entity ID (queue or session ID) or signature
-      noAuthCmd :: Either ErrorType (Command p)
-      noAuthCmd
-        | isNothing auth && B.null entId = Right cmd
-        | otherwise = Left $ CMD HAS_AUTH

 instance ProtocolEncoding SMPVersion ErrorType Cmd where
  type Tag Cmd = CmdTag
@@ -1358,16 +1185,10 @@ instance ProtocolEncoding SMPVersion ErrorType Cmd where
        ACK_ -> ACK <$> _smpP
        OFF_ -> pure OFF
        DEL_ -> pure DEL
-        QUE_ -> pure QUE
    CT SSender tag ->
      Cmd SSender <$> case tag of
        SEND_ -> SEND <$> _smpP <*> (unTail <$> _smpP)
        PING_ -> pure PING
-        RFWD_ -> RFWD <$> (EncFwdTransmission . unTail <$> _smpP)
-    CT SProxiedClient tag ->
-      Cmd SProxiedClient <$> case tag of
-        PFWD_ -> PFWD <$> _smpP <*> smpP <*> (EncTransmission . unTail <$> smpP)
-        PRXY_ -> PRXY <$> _smpP <*> smpP
    CT SNotifier NSUB_ -> pure $ Cmd SNotifier NSUB

  fromProtocolError = fromProtocolError @SMPVersion @ErrorType @BrokerMsg
@@ -1383,11 +1204,7 @@ instance ProtocolEncoding SMPVersion ErrorType BrokerMsg where
      e (MSG_, ' ', msgId, Tail body)
    NID nId srvNtfDh -> e (NID_, ' ', nId, srvNtfDh)
    NMSG nmsgNonce encNMsgMeta -> e (NMSG_, ' ', nmsgNonce, encNMsgMeta)
-    PKEY sid vr (cert, key) -> e (PKEY_, ' ', sid, vr, C.encodeCertChain cert, C.SignedObject key)
-    RRES (EncFwdResponse encBlock) -> e (RRES_, ' ', Tail encBlock)
-    PRES (EncResponse encBlock) -> e (PRES_, ' ', Tail encBlock)
    END -> e END_
-    INFO info -> e (INFO_, ' ', info)
    OK -> e OK_
    ERR err -> e (ERR_, ' ', err)
    PONG -> e PONG_
@@ -1404,11 +1221,7 @@ instance ProtocolEncoding SMPVersion ErrorType BrokerMsg where
    IDS_ -> IDS <$> (QIK <$> _smpP <*> smpP <*> smpP)
    NID_ -> NID <$> _smpP <*> smpP
    NMSG_ -> NMSG <$> _smpP <*> smpP
-    PKEY_ -> PKEY <$> _smpP <*> smpP <*> ((,) <$> C.certChainP <*> (C.getSignedExact <$> smpP))
-    RRES_ -> RRES <$> (EncFwdResponse . unTail <$> _smpP)
-    PRES_ -> PRES <$> (EncResponse . unTail <$> _smpP)
    END_ -> pure END
-    INFO_ -> INFO <$> _smpP
    OK_ -> pure OK
    ERR_ -> ERR <$> _smpP
    PONG_ -> pure PONG
@@ -1420,24 +1233,19 @@ instance ProtocolEncoding SMPVersion ErrorType BrokerMsg where
    PEBlock -> BLOCK
  {-# INLINE fromProtocolError #-}

-  checkCredentials (_, _, entId, _) cmd = case cmd of
+  checkCredentials (_, _, queueId, _) cmd = case cmd of
    -- IDS response should not have queue ID
    IDS _ -> Right cmd
    -- ERR response does not always have queue ID
    ERR _ -> Right cmd
    -- PONG response must not have queue ID
-    PONG -> noEntityMsg
-    PKEY {} -> noEntityMsg
-    RRES _ -> noEntityMsg
+    PONG
+      | B.null queueId -> Right cmd
+      | otherwise -> Left $ CMD HAS_AUTH
    -- other broker responses must have queue ID
    _
-      | B.null entId -> Left $ CMD NO_ENTITY
+      | B.null queueId -> Left $ CMD NO_ENTITY
      | otherwise -> Right cmd
-    where
-      noEntityMsg :: Either ErrorType BrokerMsg
-      noEntityMsg
-        | B.null entId = Right cmd
-        | otherwise = Left $ CMD HAS_AUTH

 -- | Parse SMP protocol commands and broker messages
 parseProtocol :: forall v err msg. ProtocolEncoding v err msg => Version v -> ByteString -> Either err msg
@@ -1460,11 +1268,8 @@ instance Encoding ErrorType where
    BLOCK -> "BLOCK"
    SESSION -> "SESSION"
    CMD err -> "CMD " <> smpEncode err
-    PROXY err -> "PROXY " <> smpEncode err
    AUTH -> "AUTH"
-    CRYPTO -> "CRYPTO"
    QUOTA -> "QUOTA"
-    EXPIRED -> "EXPIRED"
    NO_MSG -> "NO_MSG"
    LARGE_MSG -> "LARGE_MSG"
    INTERNAL -> "INTERNAL"
@@ -1475,16 +1280,13 @@ instance Encoding ErrorType where
      "BLOCK" -> pure BLOCK
      "SESSION" -> pure SESSION
      "CMD" -> CMD <$> _smpP
-      "PROXY" -> PROXY <$> _smpP
      "AUTH" -> pure AUTH
-      "CRYPTO" -> pure CRYPTO
      "QUOTA" -> pure QUOTA
-      "EXPIRED" -> pure EXPIRED
      "NO_MSG" -> pure NO_MSG
      "LARGE_MSG" -> pure LARGE_MSG
      "INTERNAL" -> pure INTERNAL
      "DUPLICATE_" -> pure DUPLICATE_
-      _ -> fail "bad ErrorType"
+      _ -> fail "bad error type"

 instance Encoding CommandError where
  smpEncode e = case e of
@@ -1502,74 +1304,8 @@ instance Encoding CommandError where
      "NO_AUTH" -> pure NO_AUTH
      "HAS_AUTH" -> pure HAS_AUTH
      "NO_ENTITY" -> pure NO_ENTITY
-      "NO_QUEUE" -> pure NO_ENTITY -- for backward compatibility
-      _ -> fail "bad CommandError"
-
-instance Encoding ProxyError where
-  smpEncode = \case
-    PROTOCOL e -> "PROTOCOL " <> smpEncode e
-    BROKER e -> "BROKER " <> smpEncode e
-    BASIC_AUTH -> "BASIC_AUTH"
-    NO_SESSION -> "NO_SESSION"
-  smpP =
-    A.takeTill (== ' ') >>= \case
-      "PROTOCOL" -> PROTOCOL <$> _smpP
-      "BROKER" -> BROKER <$> _smpP
-      "BASIC_AUTH" -> pure BASIC_AUTH
-      "NO_SESSION" -> pure NO_SESSION
-      _ -> fail "bad ProxyError"
-
-instance StrEncoding ProxyError where
-  strEncode = \case
-    PROTOCOL e -> "PROTOCOL " <> strEncode e
-    BROKER e -> "BROKER " <> strEncode e
-    BASIC_AUTH -> "BASIC_AUTH"
-    NO_SESSION -> "NO_SESSION"
-  strP =
-    A.takeTill (== ' ') >>= \case
-      "PROTOCOL" -> PROTOCOL <$> _strP
-      "BROKER" -> BROKER <$> _strP
-      "BASIC_AUTH" -> pure BASIC_AUTH
-      "NO_SESSION" -> pure NO_SESSION
-      _ -> fail "bad ProxyError"
-
-instance Encoding BrokerErrorType where
-  smpEncode = \case
-    RESPONSE e -> "RESPONSE " <> smpEncode e
-    UNEXPECTED e -> "UNEXPECTED " <> smpEncode e
-    TRANSPORT e -> "TRANSPORT " <> smpEncode e
-    NETWORK -> "NETWORK"
-    TIMEOUT -> "TIMEOUT"
-    HOST -> "HOST"
-  smpP =
-    A.takeTill (== ' ') >>= \case
-      "RESPONSE" -> RESPONSE <$> _smpP
-      "UNEXPECTED" -> UNEXPECTED <$> _smpP
-      "TRANSPORT" -> TRANSPORT <$> _smpP
-      "NETWORK" -> pure NETWORK
-      "TIMEOUT" -> pure TIMEOUT
-      "HOST" -> pure HOST
-      _ -> fail "bad BrokerErrorType"
-
-instance StrEncoding BrokerErrorType where
-  strEncode = \case
-    RESPONSE e -> "RESPONSE " <> encodeUtf8 (T.pack e)
-    UNEXPECTED e -> "UNEXPECTED " <> encodeUtf8 (T.pack e)
-    TRANSPORT e -> "TRANSPORT " <> smpEncode e
-    NETWORK -> "NETWORK"
-    TIMEOUT -> "TIMEOUT"
-    HOST -> "HOST"
-  strP =
-    A.takeTill (== ' ') >>= \case
-      "RESPONSE" -> RESPONSE <$> _textP
-      "UNEXPECTED" -> UNEXPECTED <$> _textP
-      "TRANSPORT" -> TRANSPORT <$> _smpP
-      "NETWORK" -> pure NETWORK
-      "TIMEOUT" -> pure TIMEOUT
-      "HOST" -> pure HOST
-      _ -> fail "bad BrokerErrorType"
-    where
-      _textP = A.space *> (T.unpack . safeDecodeUtf8 <$> A.takeByteString)
+      "NO_QUEUE" -> pure NO_ENTITY
+      _ -> fail "bad command error type"

 -- | Send signed SMP transmission to TCP transport.
 tPut :: Transport c => THandle v c p -> NonEmpty (Either TransportError SentRawTransmission) -> IO [Either TransportError ()]
@@ -1708,7 +1444,4 @@ $(J.deriveJSON defaultJSON ''MsgFlags)

 $(J.deriveJSON (sumTypeJSON id) ''CommandError)

-$(J.deriveJSON (sumTypeJSON id) ''BrokerErrorType)
-
-- run deriveJSON in one TH splice to allow mutual instance
-$(concat <$> mapM @[] (J.deriveJSON (sumTypeJSON id)) [''ProxyError, ''ErrorType])
+$(J.deriveJSON (sumTypeJSON id) ''ErrorType)
@@ -6,7 +6,6 @@
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE KindSignatures #-}
 {-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE MultiWayIf #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE NumericUnderscores #-}
 {-# LANGUAGE OverloadedLists #-}
@@ -14,6 +13,7 @@
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TupleSections #-}
+{-# LANGUAGE TypeApplications #-}

 -- |
 -- Module      : Simplex.Messaging.Server
@@ -43,28 +43,22 @@ import Control.Monad
 import Control.Monad.Except
 import Control.Monad.IO.Unlift
 import Control.Monad.Reader
-import Control.Monad.Trans.Except
 import Crypto.Random
-import Control.Monad.STM (retry)
 import Data.Bifunctor (first)
 import Data.ByteString.Base64 (encode)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import qualified Data.ByteString.Lazy.Char8 as LB
 import Data.Either (fromRight, partitionEithers)
-import Data.Foldable (toList)
 import Data.Functor (($>))
+import qualified Data.HashMap.Strict as HM
 import Data.Int (Int64)
-import Data.IntMap.Strict (IntMap)
 import qualified Data.IntMap.Strict as IM
-import qualified Data.IntSet as IS
 import Data.List (intercalate, mapAccumR)
-import Data.List.NonEmpty (NonEmpty (..))
+import Data.List.NonEmpty (NonEmpty)
 import qualified Data.List.NonEmpty as L
 import qualified Data.Map.Strict as M
-import Data.Set (Set)
-import qualified Data.Set as S
-import Data.Maybe (catMaybes, fromMaybe, isJust, isNothing, listToMaybe)
+import Data.Maybe (isNothing)
 import qualified Data.Text as T
 import Data.Text.Encoding (decodeLatin1)
 import Data.Time.Clock (UTCTime (..), diffTimeToPicoseconds, getCurrentTime)
@@ -75,10 +69,8 @@ import GHC.Stats (getRTSStats)
 import GHC.TypeLits (KnownNat)
 import Network.Socket (ServiceName, Socket, socketToHandle)
 import Simplex.Messaging.Agent.Lock
-import Simplex.Messaging.Client (ProtocolClient (thParams), ProtocolClientError (..), SMPClient, SMPClientError, forwardSMPMessage, smpProxyError, temporaryClientError)
-import Simplex.Messaging.Client.Agent (OwnServer, SMPClientAgent (..), SMPClientAgentEvent (..), closeSMPClientAgent, getSMPServerClient'', isOwnServer, lookupSMPServerClient, getConnectedSMPServerClient)
 import qualified Simplex.Messaging.Crypto as C
-import Simplex.Messaging.Encoding
+import Simplex.Messaging.Encoding (Encoding (smpEncode))
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Protocol
 import Simplex.Messaging.Server.Control
@@ -87,10 +79,8 @@ import Simplex.Messaging.Server.Expiration
 import Simplex.Messaging.Server.MsgStore
 import Simplex.Messaging.Server.MsgStore.STM
 import Simplex.Messaging.Server.QueueStore
-import Simplex.Messaging.Server.QueueStore.QueueInfo
 import Simplex.Messaging.Server.QueueStore.STM as QS
 import Simplex.Messaging.Server.Stats
-import qualified Simplex.Messaging.Server.Stats.Client as CS
 import Simplex.Messaging.Server.StoreLog
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
@@ -98,19 +88,18 @@ import Simplex.Messaging.Transport
 import Simplex.Messaging.Transport.Buffer (trimCR)
 import Simplex.Messaging.Transport.Server
 import Simplex.Messaging.Util
-import Simplex.Messaging.Version
 import System.Exit (exitFailure)
-import System.FilePath (takeDirectory)
 import System.IO (hPrint, hPutStrLn, hSetNewlineMode, universalNewlineMode)
 import System.Mem.Weak (deRefWeak)
 import UnliftIO (timeout)
 import UnliftIO.Concurrent
-import UnliftIO.Directory (createDirectoryIfMissing, doesFileExist, renameFile)
+import UnliftIO.Directory (doesFileExist, renameFile)
 import UnliftIO.Exception
 import UnliftIO.IO
 import UnliftIO.STM
 #if MIN_VERSION_base(4,18,0)
 import Data.List (sort)
+import Data.Maybe (fromMaybe)
 import GHC.Conc (listThreads, threadStatus)
 import GHC.Conc.Sync (threadLabel)
 #endif
@@ -135,16 +124,14 @@ type M a = ReaderT Env IO a
 smpServer :: TMVar Bool -> ServerConfig -> M ()
 smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
  s <- asks server
-  pa <- asks proxyAgent
  expired <- restoreServerMessages
  restoreServerStats expired
  raceAny_
    ( serverThread s "server subscribedQ" subscribedQ subscribers subscriptions cancelSub
        : serverThread s "server ntfSubscribedQ" ntfSubscribedQ Env.notifiers ntfSubscriptions (\_ -> pure ())
-        : receiveFromProxyAgent pa
-        : map runServer transports <> expireMessagesThread_ cfg <> serverStatsThread_ cfg <> rateStatsThread_ cfg <> controlPortThread_ cfg
+        : map runServer transports <> expireMessagesThread_ cfg <> serverStatsThread_ cfg <> controlPortThread_ cfg
    )
-    `finally` withLock' (savingLock s) "final" (saveServer False >> closeServer)
+    `finally` withLock' (savingLock s) "final" (saveServer False)
  where
    runServer :: (ServiceName, ATransport) -> M ()
    runServer (tcpPort, ATransport t) = do
@@ -158,9 +145,6 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
    saveServer :: Bool -> M ()
    saveServer keepMsgs = withLog closeStoreLog >> saveServerMessages keepMsgs >> saveServerStats

-    closeServer :: M ()
-    closeServer = asks (smpAgent . proxyAgent) >>= liftIO . closeSMPClientAgent
-
    serverThread ::
      forall s.
      Server ->
@@ -189,22 +173,14 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
          TM.lookupInsert qId clnt (subs s) $>>= clientToBeNotified
        endPreviousSubscriptions :: (QueueId, Client) -> M (Maybe s)
        endPreviousSubscriptions (qId, c) = do
-          forkClient c (label <> ".endPreviousSubscriptions") $
+          tId <- atomically $ stateTVar (endThreadSeq c) $ \next -> (next, next + 1)
+          t <- forkIO $ do
+            labelMyThread $ label <> ".endPreviousSubscriptions"
            atomically $ writeTBQueue (sndQ c) [(CorrId "", qId, END)]
+            atomically $ modifyTVar' (endThreads c) $ IM.delete tId
+          mkWeakThreadId t >>= atomically . modifyTVar' (endThreads c) . IM.insert tId
          atomically $ TM.lookupDelete qId (clientSubs c)

-    receiveFromProxyAgent :: ProxyAgent -> M ()
-    receiveFromProxyAgent ProxyAgent {smpAgent = SMPClientAgent {agentQ}} =
-      forever $
-        atomically (readTBQueue agentQ) >>= \case
-          CAConnected srv -> logInfo $ "SMP server connected " <> showServer' srv
-          CADisconnected srv [] -> logInfo $ "SMP server disconnected " <> showServer' srv
-          CADisconnected srv subs -> logError $ "SMP server disconnected " <> showServer' srv <> " / subscriptions: " <> tshow (length subs)
-          CAResubscribed srv subs -> logError $ "SMP server resubscribed " <> showServer' srv <> " / subscriptions: " <> tshow (length subs)
-          CASubError srv errs -> logError $ "SMP server subscription errors " <> showServer' srv <> " / errors: " <> tshow (length errs)
-      where
-        showServer' = decodeLatin1 . strEncode . host
-
    expireMessagesThread_ :: ServerConfig -> [M ()]
    expireMessagesThread_ ServerConfig {messageExpiration = Just msgExp} = [expireMessages msgExp]
    expireMessagesThread_ _ = []
@@ -230,20 +206,13 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
      [logServerStats logStatsStartTime interval serverStatsLogFile]
    serverStatsThread_ _ = []

-    rateStatsThread_ :: ServerConfig -> [M ()]
-    rateStatsThread_ ServerConfig {rateStatsLength = nBuckets, rateStatsInterval = Just bucketWidth, logStatsInterval = Just logInterval, logStatsStartTime, rateStatsLogFile} =
-      [ monitorServerRates nBuckets bucketWidth, -- roll windows, collect counters, runs at a faster rate so the measurements can be used for online anomaly detection
-        logServerRates logStatsStartTime logInterval rateStatsLogFile -- log current distributions once in a while
-      ]
-    rateStatsThread_ _ = []
-
    logServerStats :: Int64 -> Int64 -> FilePath -> M ()
    logServerStats startAt logInterval statsFilePath = do
      labelMyThread "logServerStats"
      initialDelay <- (startAt -) . fromIntegral . (`div` 1000000_000000) . diffTimeToPicoseconds . utctDayTime <$> liftIO getCurrentTime
      liftIO $ putStrLn $ "server stats log enabled: " <> statsFilePath
      liftIO $ threadDelay' $ 1000000 * (initialDelay + if initialDelay < 0 then 86400 else 0)
-      ServerStats {fromTime, qCreated, qSecured, qDeletedAll, qDeletedNew, qDeletedSecured, qSub, qSubAuth, qSubDuplicate, qSubProhibited, msgSent, msgSentAuth, msgSentQuota, msgSentLarge, msgRecv, msgExpired, activeQueues, msgSentNtf, msgRecvNtf, activeQueuesNtf, qCount, msgCount, pRelays, pRelaysOwn, pMsgFwds, pMsgFwdsOwn, pMsgFwdsRecv} <- asks serverStats
+      ServerStats {fromTime, qCreated, qSecured, qDeletedAll, qDeletedNew, qDeletedSecured, msgSent, msgRecv, msgExpired, activeQueues, msgSentNtf, msgRecvNtf, activeQueuesNtf, qCount, msgCount} <- asks serverStats
      let interval = 1000000 * logInterval
      forever $ do
        withFile statsFilePath AppendMode $ \h -> liftIO $ do
@@ -255,128 +224,39 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
          qDeletedAll' <- atomically $ swapTVar qDeletedAll 0
          qDeletedNew' <- atomically $ swapTVar qDeletedNew 0
          qDeletedSecured' <- atomically $ swapTVar qDeletedSecured 0
-          qSub' <- atomically $ swapTVar qSub 0
-          qSubAuth' <- atomically $ swapTVar qSubAuth 0
-          qSubDuplicate' <- atomically $ swapTVar qSubDuplicate 0
-          qSubProhibited' <- atomically $ swapTVar qSubProhibited 0
          msgSent' <- atomically $ swapTVar msgSent 0
-          msgSentAuth' <- atomically $ swapTVar msgSentAuth 0
-          msgSentQuota' <- atomically $ swapTVar msgSentQuota 0
-          msgSentLarge' <- atomically $ swapTVar msgSentLarge 0
          msgRecv' <- atomically $ swapTVar msgRecv 0
          msgExpired' <- atomically $ swapTVar msgExpired 0
          ps <- atomically $ periodStatCounts activeQueues ts
          msgSentNtf' <- atomically $ swapTVar msgSentNtf 0
          msgRecvNtf' <- atomically $ swapTVar msgRecvNtf 0
          psNtf <- atomically $ periodStatCounts activeQueuesNtf ts
-          pRelays' <- atomically $ getResetProxyStatsData pRelays
-          pRelaysOwn' <- atomically $ getResetProxyStatsData pRelaysOwn
-          pMsgFwds' <- atomically $ getResetProxyStatsData pMsgFwds
-          pMsgFwdsOwn' <- atomically $ getResetProxyStatsData pMsgFwdsOwn
-          pMsgFwdsRecv' <- atomically $ swapTVar pMsgFwdsRecv 0
          qCount' <- readTVarIO qCount
          msgCount' <- readTVarIO msgCount
          hPutStrLn h $
            intercalate
              ","
-              ( [ iso8601Show $ utctDay fromTime',
-                  show qCreated',
-                  show qSecured',
-                  show qDeletedAll',
-                  show msgSent',
-                  show msgRecv',
-                  dayCount ps,
-                  weekCount ps,
-                  monthCount ps,
-                  show msgSentNtf',
-                  show msgRecvNtf',
-                  dayCount psNtf,
-                  weekCount psNtf,
-                  monthCount psNtf,
-                  show qCount',
-                  show msgCount',
-                  show msgExpired',
-                  show qDeletedNew',
-                  show qDeletedSecured'
-                ]
-                  <> showProxyStats pRelays'
-                  <> showProxyStats pRelaysOwn'
-                  <> showProxyStats pMsgFwds'
-                  <> showProxyStats pMsgFwdsOwn'
-                  <> [ show pMsgFwdsRecv',
-                       show qSub',
-                       show qSubAuth',
-                       show qSubDuplicate',
-                       show qSubProhibited',
-                       show msgSentAuth',
-                       show msgSentQuota',
-                       show msgSentLarge'
-                     ]
-              )
+              [ iso8601Show $ utctDay fromTime',
+                show qCreated',
+                show qSecured',
+                show qDeletedAll',
+                show msgSent',
+                show msgRecv',
+                dayCount ps,
+                weekCount ps,
+                monthCount ps,
+                show msgSentNtf',
+                show msgRecvNtf',
+                dayCount psNtf,
+                weekCount psNtf,
+                monthCount psNtf,
+                show qCount',
+                show msgCount',
+                show msgExpired',
+                show qDeletedNew',
+                show qDeletedSecured'
+              ]
        liftIO $ threadDelay' interval
-      where
-        showProxyStats ProxyStatsData {_pRequests, _pSuccesses, _pErrorsConnect, _pErrorsCompat, _pErrorsOther} =
-          [show _pRequests, show _pSuccesses, show _pErrorsConnect, show _pErrorsCompat, show _pErrorsOther]
-
-    monitorServerRates :: Int -> Int64 -> M ()
-    monitorServerRates nBuckets bucketWidth = do
-      labelMyThread "monitorServerRates"
-      stats' <- asks clientStats
-      rates' <- asks serverRates
-      liftIO . forever $ do
-        -- now <- getCurrentTime
-        -- TODO: calculate delay for the next bucket closing time
-        threadDelay' $ bucketWidth * 1000000
-        stats <- readTVarIO stats' >>= mapM (CS.readClientStatsData readTVarIO)
-        let !rates = distribution . histogram <$> collect stats
-        atomically . modifyTVar' rates' $ \old ->
-          let timeline = take nBuckets old
-          in length timeline `seq` rates : timeline
-      where
-        collect :: IntMap CS.ClientStatsData -> CS.ClientStatsC (IntMap Int)
-        collect = IM.foldlWithKey' toColumns (CS.clientStatsC IM.empty)
-          where
-            toColumns acc statsId csd =
-              CS.ClientStatsC
-                { peerAddressesC = IS.size _peerAddresses +> CS.peerAddressesC acc,
-                  socketCountC = _socketCount +> CS.socketCountC acc,
-                  -- created/updated skpped
-                  qCreatedC = S.size _qCreated +> CS.qCreatedC acc,
-                  qSentSignedC = S.size _qSentSigned +> CS.qSentSignedC acc,
-                  msgSentSignedC = _msgSentSigned +> CS.msgSentSignedC acc,
-                  msgSentUnsignedC = _msgSentUnsigned +> CS.msgSentUnsignedC acc,
-                  msgDeliveredSignedC = _msgDeliveredSigned +> CS.msgDeliveredSignedC acc,
-                  proxyRelaysRequestedC = _proxyRelaysRequested +> CS.proxyRelaysRequestedC acc,
-                  proxyRelaysConnectedC = _proxyRelaysConnected +> CS.proxyRelaysConnectedC acc,
-                  msgSentViaProxyC = _msgSentViaProxy +> CS.msgSentViaProxyC acc
-                }
-              where
-                (+>) = IM.insertWith (+) statsId
-                CS.ClientStatsData {_peerAddresses, _socketCount, _qCreated, _qSentSigned, _msgSentSigned, _msgSentUnsigned, _msgDeliveredSigned, _proxyRelaysRequested, _proxyRelaysConnected, _msgSentViaProxy} = csd
-
-    logServerRates :: Int64 -> Int64 -> FilePath -> M ()
-    logServerRates startAt logInterval statsFilePath = do
-      labelMyThread "logServerStats"
-      liftIO . unlessM (doesFileExist statsFilePath) $ do
-        createDirectoryIfMissing True (takeDirectory statsFilePath)
-        B.writeFile statsFilePath $ B.intercalate "," csvLabels <> "\n"
-      initialDelay <- (startAt -) . fromIntegral . (`div` 1000000_000000) . diffTimeToPicoseconds . utctDayTime <$> liftIO getCurrentTime
-      liftIO $ putStrLn $ "server rates log enabled: " <> statsFilePath
-      liftIO $ threadDelay' $ 1000000 * (initialDelay + if initialDelay < 0 then 86400 else 0)
-      let interval = 1000000 * logInterval
-      rates' <- asks serverRates
-      liftIO . forever $ do
-        -- write the thing
-        rates <- readTVarIO rates'
-        forM_ (listToMaybe rates) $ \cs -> do
-          ts <- getCurrentTime
-          let values = concatMap (map bshow . toList) cs
-          withFile statsFilePath AppendMode $ \h -> liftIO $ do
-            hSetBuffering h LineBuffering
-            B.hPut h $ B.intercalate "," (strEncode ts : values) <> "\n"
-        threadDelay' interval
-      where
-        csvLabels = "ts" : concatMap (\s -> concatMap (\d -> [s <> "." <> d]) distributionLabels) CS.clientStatsLabels

    runClient :: Transport c => C.APrivateSignKey -> TProxy c -> c -> M ()
    runClient signKey tp h = do
@@ -436,7 +316,7 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
              CPResume -> withAdminRole $ hPutStrLn h "resume not implemented"
              CPClients -> withAdminRole $ do
                active <- unliftIO u (asks clients) >>= readTVarIO
-                hPutStrLn h "clientId,sessionId,connected,createdAt,rcvActiveAt,sndActiveAt,age,subscriptions"
+                hPutStrLn h $ "clientId,sessionId,connected,createdAt,rcvActiveAt,sndActiveAt,age,subscriptions"
                forM_ (IM.toList active) $ \(cid, Client {sessionId, connected, createdAt, rcvActiveAt, sndActiveAt, subscriptions}) -> do
                  connected' <- bshow <$> readTVarIO connected
                  rcvActiveAt' <- strEncode <$> readTVarIO rcvActiveAt
@@ -446,13 +326,7 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
                  subscriptions' <- bshow . M.size <$> readTVarIO subscriptions
                  hPutStrLn h . B.unpack $ B.intercalate "," [bshow cid, encode sessionId, connected', strEncode createdAt, rcvActiveAt', sndActiveAt', bshow age, subscriptions']
              CPStats -> withAdminRole $ do
-                ss <- unliftIO u $ asks serverStats
-                let putStat :: Show a => ByteString -> (ServerStats -> TVar a) -> IO ()
-                    putStat label var = readTVarIO (var ss) >>= \v -> B.hPutStr h $ label <> ": " <> bshow v <> "\n"
-                    putProxyStat :: ByteString -> (ServerStats -> ProxyStats) -> IO ()
-                    putProxyStat label var = do
-                      ProxyStatsData {_pRequests, _pSuccesses, _pErrorsConnect, _pErrorsCompat, _pErrorsOther} <- atomically $ getProxyStatsData $ var ss
-                      B.hPutStr h $ label <> ": requests=" <> bshow _pRequests <> ", successes=" <> bshow _pSuccesses <> ", errorsConnect=" <> bshow _pErrorsConnect <> ", errorsCompat=" <> bshow _pErrorsCompat <> ", errorsOther=" <> bshow _pErrorsOther <> "\n"
+                ServerStats {fromTime, qCreated, qSecured, qDeletedAll, qDeletedNew, qDeletedSecured, msgSent, msgRecv, msgSentNtf, msgRecvNtf, qCount, msgCount} <- unliftIO u $ asks serverStats
                putStat "fromTime" fromTime
                putStat "qCreated" qCreated
                putStat "qSecured" qSecured
@@ -465,18 +339,9 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
                putStat "msgRecvNtf" msgRecvNtf
                putStat "qCount" qCount
                putStat "msgCount" msgCount
-                putProxyStat "pRelays" pRelays
-                putProxyStat "pRelaysOwn" pRelaysOwn
-                putProxyStat "pMsgFwds" pMsgFwds
-                putProxyStat "pMsgFwdsOwn" pMsgFwdsOwn
-                putStat "pMsgFwdsRecv" pMsgFwdsRecv
-              CPStatsClients -> withAdminRole $ do
-                stats' <- unliftIO u (asks clientStats) >>= readTVarIO
-                B.hPutStr h "peerAddresses,socketCount,createdAt,updatedAt,qCreated,qSentSigned,msgSentSigned,msgSentUnsigned,msgDeliveredSigned,proxyRelaysRequested,proxyRelaysConnected,msgSentViaProxy\n"
-                forM_ stats' $ \cs -> do
-                  csd <- CS.readClientStatsData readTVarIO cs
-                  let CS.ClientStatsData {_peerAddresses, _socketCount, _createdAt, _updatedAt, _qCreated, _qSentSigned, _msgSentSigned, _msgSentUnsigned, _msgDeliveredSigned, _proxyRelaysRequested, _proxyRelaysConnected, _msgSentViaProxy} = csd
-                  B.hPutStrLn h $ B.intercalate "," [bshow $ IS.size _peerAddresses, bshow _socketCount, strEncode _createdAt, strEncode _updatedAt, bshow $ S.size _qCreated, bshow $ S.size _qSentSigned, bshow _msgSentSigned, bshow _msgSentUnsigned, bshow _msgDeliveredSigned, bshow _proxyRelaysRequested, bshow _proxyRelaysConnected, bshow _msgSentViaProxy]
+                where
+                  putStat :: Show a => String -> TVar a -> IO ()
+                  putStat label var = readTVarIO var >>= \v -> hPutStrLn h $ label <> ": " <> show v
              CPStatsRTS -> getRTSStats >>= hPrint h
              CPThreads -> withAdminRole $ do
 #if MIN_VERSION_base(4,18,0)
@@ -547,24 +412,20 @@ smpServer started cfg@ServerConfig {transports, transportConfig = tCfg} = do
                    hPutStrLn h "AUTH"

 runClientTransport :: Transport c => THandleSMP c 'TServer -> M ()
-runClientTransport h@THandle {connection, params = thParams@THandleParams {thVersion, sessionId}} = do
+runClientTransport h@THandle {params = THandleParams {thVersion, sessionId}} = do
  q <- asks $ tbqSize . config
  ts <- liftIO getSystemTime
  active <- asks clients
  nextClientId <- asks clientSeq
-  let peerId = getPeerId connection
-      skipStats = False -- TODO: check peerId
-  statsIds' <- asks statsClients
  c <- atomically $ do
-    new@Client {clientId} <- newClient peerId nextClientId q thVersion sessionId ts
-    unless skipStats $ modifyTVar' statsIds' $ IM.insert clientId clientId -- until merged, its own fresh id is its stats id
+    new@Client {clientId} <- newClient nextClientId q thVersion sessionId ts
    modifyTVar' active $ IM.insert clientId new
    pure new
  s <- asks server
  expCfg <- asks $ inactiveClientExpiration . config
  th <- newMVar h -- put TH under a fair lock to interleave messages and command responses
  labelMyThread . B.unpack $ "client $" <> encode sessionId
-  raceAny_ ([liftIO $ send th c, liftIO $ sendMsg th c, client thParams c s, receive h c] <> disconnectThread_ c expCfg)
+  raceAny_ ([liftIO $ send th c, liftIO $ sendMsg th c, client c s, receive h c] <> disconnectThread_ c expCfg)
    `finally` clientDisconnected c
  where
    disconnectThread_ c (Just expCfg) = [liftIO $ disconnectTransport h (rcvActiveAt c) (sndActiveAt c) expCfg (noSubscriptions c)]
@@ -582,7 +443,6 @@ clientDisconnected c@Client {clientId, subscriptions, connected, sessionId, endT
  atomically $ modifyTVar' srvSubs $ \cs ->
    M.foldrWithKey (\sub _ -> M.update deleteCurrentClient sub) cs subs
  asks clients >>= atomically . (`modifyTVar'` IM.delete clientId)
-  asks statsClients >>= atomically . (`modifyTVar'` IM.delete clientId)
  tIds <- atomically $ swapTVar endThreads IM.empty
  liftIO $ mapM_ (mapM_ killThread <=< deRefWeak) tIds
  where
@@ -606,25 +466,19 @@ receive h@THandle {params = THandleParams {thAuth}} Client {rcvQ, sndQ, rcvActiv
  forever $ do
    ts <- L.toList <$> liftIO (tGet h)
    atomically . writeTVar rcvActiveAt =<< liftIO getSystemTime
-    stats <- asks serverStats
-    (errs, cmds) <- partitionEithers <$> mapM (cmdAction stats) ts
-    write sndQ errs
-    write rcvQ cmds
+    as <- partitionEithers <$> mapM cmdAction ts
+    write sndQ $ fst as
+    write rcvQ $ snd as
  where
-    cmdAction :: ServerStats -> SignedTransmission ErrorType Cmd -> M (Either (Transmission BrokerMsg) (Maybe QueueRec, Transmission Cmd))
-    cmdAction stats (tAuth, authorized, (corrId, entId, cmdOrError)) =
+    cmdAction :: SignedTransmission ErrorType Cmd -> M (Either (Transmission BrokerMsg) (Maybe QueueRec, Transmission Cmd))
+    cmdAction (tAuth, authorized, (corrId, queueId, cmdOrError)) =
      case cmdOrError of
-        Left e -> pure $ Left (corrId, entId, ERR e)
-        Right cmd -> verified =<< verifyTransmission ((,C.cbNonce (bs corrId)) <$> thAuth) tAuth authorized entId cmd
+        Left e -> pure $ Left (corrId, queueId, ERR e)
+        Right cmd -> verified <$> verifyTransmission ((,C.cbNonce (bs corrId)) <$> thAuth) tAuth authorized queueId cmd
          where
            verified = \case
-              VRVerified qr -> pure $ Right (qr, (corrId, entId, cmd))
-              VRFailed -> do
-                case cmd of
-                  Cmd _ SEND {} -> atomically $ modifyTVar' (msgSentAuth stats) (+ 1)
-                  Cmd _ SUB -> atomically $ modifyTVar' (qSubAuth stats) (+ 1)
-                  _ -> pure ()
-                pure $ Left (corrId, entId, ERR AUTH)
+              VRVerified qr -> Right (qr, (corrId, queueId, cmd))
+              VRFailed -> Left (corrId, queueId, ERR AUTH)
    write q = mapM_ (atomically . writeTBQueue q) . L.nonEmpty

 send :: Transport c => MVar (THandleSMP c 'TServer) -> Client -> IO ()
@@ -688,22 +542,26 @@ verifyTransmission :: Maybe (THandleAuth 'TServer, C.CbNonce) -> Maybe Transmiss
 verifyTransmission auth_ tAuth authorized queueId cmd =
  case cmd of
    Cmd SRecipient (NEW k _ _ _) -> pure $ Nothing `verifiedWith` k
-    Cmd SRecipient _ -> verifyQueue (\q -> Just q `verifiedWith` recipientKey q) <$> get SRecipient
+    Cmd SRecipient _ -> do
+      QueueStore {recipientKeys} <- asks queueStore
+      (queueId `HM.lookup`) <$> readTVarIO recipientKeys >>= \case
+        Nothing -> pure $! dummyVerify
+        Just rKey -> if verify rKey then slowIO >> get SRecipient >>= either (\_notGonnaHappenUnlessDeletedWhileCheckingAuth -> pure VRFailed) (pure . VRVerified . Just) else pure VRFailed
    -- SEND will be accepted without authorization before the queue is secured with KEY command
    Cmd SSender SEND {} -> verifyQueue (\q -> Just q `verified` maybe (isNothing tAuth) verify (senderKey q)) <$> get SSender
    Cmd SSender PING -> pure $ VRVerified Nothing
-    Cmd SSender RFWD {} -> pure $ VRVerified Nothing
    -- NSUB will not be accepted without authorization
-    Cmd SNotifier NSUB -> verifyQueue (\q -> maybe dummyVerify (\n -> Just q `verifiedWith` notifierKey n) (notifier q)) <$> get SNotifier
-    Cmd SProxiedClient _ -> pure $ VRVerified Nothing
+    Cmd SNotifier NSUB -> verifyQueue (\q -> maybe dummyVerify (Just q `verifiedWith`) (notifierKey <$> notifier q)) <$> get SNotifier
  where
    verify = verifyCmdAuthorization auth_ tAuth authorized
    dummyVerify = verify (dummyAuthKey tAuth) `seq` VRFailed
    verifyQueue :: (QueueRec -> VerificationResult) -> Either ErrorType QueueRec -> VerificationResult
-    verifyQueue = either (const dummyVerify)
+    verifyQueue = either (\_ -> dummyVerify)
    verified q cond = if cond then VRVerified q else VRFailed
    verifiedWith q k = q `verified` verify k
-    get :: DirectParty p => SParty p -> M (Either ErrorType QueueRec)
+    slowIO :: M ()
+    slowIO = liftIO $ threadDelay 100000 -- XXX: Some thumb twiddling to prove that fetching queue data doesn't allow to distinguish bad key and non-existent queue.
+    get :: SParty p -> M (Either ErrorType QueueRec)
    get party = do
      st <- asks queueStore
      atomically $ getQueue st party queueId
@@ -753,144 +611,45 @@ dummyKeyEd448 = "MEMwBQYDK2VxAzoA6ibQc9XpkSLtwrf7PLvp81qW/etiumckVFImCMRdftcG/Xo
 dummyKeyX25519 :: C.PublicKey 'C.X25519
 dummyKeyX25519 = "MCowBQYDK2VuAyEA4JGSMYht18H4mas/jHeBwfcM7jLwNYJNOAhi2/g4RXg="

-forkClient :: Client -> String -> M () -> M ()
-forkClient Client {endThreads, endThreadSeq} label action = do
-  tId <- atomically $ stateTVar endThreadSeq $ \next -> (next, next + 1)
-  t <- forkIO $ do
-    labelMyThread label
-    action `finally` atomically (modifyTVar' endThreads $ IM.delete tId)
-  mkWeakThreadId t >>= atomically . modifyTVar' endThreads . IM.insert tId
-
-client :: THandleParams SMPVersion 'TServer -> Client -> Server -> M ()
-client thParams' clnt@Client {clientId, peerId, subscriptions, ntfSubscriptions, rcvQ, sndQ, sessionId, procThreads} Server {subscribedQ, ntfSubscribedQ, notifiers} = do
+client :: Client -> Server -> M ()
+client clnt@Client {subscriptions, ntfSubscriptions, rcvQ, sndQ, sessionId} Server {subscribedQ, ntfSubscribedQ, notifiers} = do
  labelMyThread . B.unpack $ "client $" <> encode sessionId <> " commands"
  forever $
    atomically (readTBQueue rcvQ)
      >>= mapM processCommand
-      >>= mapM_ reply . L.nonEmpty . catMaybes . L.toList
+      >>= atomically . writeTBQueue sndQ
  where
-    reply :: MonadIO m => NonEmpty (Transmission BrokerMsg) -> m ()
-    reply = atomically . writeTBQueue sndQ
-    processProxiedCmd :: Transmission (Command 'ProxiedClient) -> M (Maybe (Transmission BrokerMsg))
-    processProxiedCmd (corrId, sessId, command) = (corrId,sessId,) <$$> case command of
-      PRXY srv auth -> ifM allowProxy getRelay (pure $ Just $ ERR $ PROXY BASIC_AUTH)
-        where
-          allowProxy = do
-            ServerConfig {allowSMPProxy, newQueueBasicAuth} <- asks config
-            pure $ allowSMPProxy && maybe True ((== auth) . Just) newQueueBasicAuth
-          getRelay = do
-            ProxyAgent {smpAgent = a} <- asks proxyAgent
-            liftIO (getConnectedSMPServerClient a srv) >>= \case
-              Just r -> Just <$> proxyServerResponse a r
-              Nothing ->
-                forkProxiedCmd $
-                  liftIO (runExceptT (getSMPServerClient'' a srv) `catch` (pure . Left . PCEIOError))
-                    >>= proxyServerResponse a
-          proxyServerResponse :: SMPClientAgent -> Either SMPClientError (OwnServer, SMPClient) -> M BrokerMsg
-          proxyServerResponse a smp_ = do
-            ServerStats {pRelays, pRelaysOwn} <- asks serverStats
-            let inc = mkIncProxyStats pRelays pRelaysOwn
-            case smp_ of
-              Right (own, smp) -> do
-                inc own pRequests
-                case proxyResp smp of
-                  r@PKEY {} -> do
-                    withClientStatsId $ \cs -> atomically $ modifyTVar' (CS.proxyRelaysConnected cs) (+ 1)
-                    r <$ inc own pSuccesses
-                  r -> r <$ inc own pErrorsCompat
-              Left e -> do
-                let own = isOwnServer a srv
-                inc own pRequests
-                inc own $ if temporaryClientError e then pErrorsConnect else pErrorsOther
-                logError $ "Error connecting: " <> decodeLatin1 (strEncode $ host srv) <> " " <> tshow e
-                pure . ERR $ smpProxyError e
-            where
-              proxyResp smp =
-                let THandleParams {sessionId = srvSessId, thVersion, thServerVRange, thAuth} = thParams smp
-                  in case compatibleVRange thServerVRange proxiedSMPRelayVRange of
-                      -- Cap the destination relay version range to prevent client version fingerprinting.
-                      -- See comment for proxiedSMPRelayVersion.
-                      Just (Compatible vr) | thVersion >= sendingProxySMPVersion -> case thAuth of
-                        Just THAuthClient {serverCertKey} -> PKEY srvSessId vr serverCertKey
-                        Nothing -> ERR $ transportErr TENoServerAuth
-                      _ -> ERR $ transportErr TEVersion
-      PFWD fwdV pubKey encBlock -> do
-        ProxyAgent {smpAgent = a} <- asks proxyAgent
-        ServerStats {pMsgFwds, pMsgFwdsOwn} <- asks serverStats
-        let inc = mkIncProxyStats pMsgFwds pMsgFwdsOwn
-        atomically (lookupSMPServerClient a sessId) >>= \case
-          Just (own, smp) -> do
-            inc own pRequests
-            if v >= sendingProxySMPVersion
-              then forkProxiedCmd $ do
-                liftIO (runExceptT (forwardSMPMessage smp corrId fwdV pubKey encBlock) `catch` (pure . Left . PCEIOError))  >>= \case
-                  Right r -> do
-                      withClientStatsId $ \cs -> atomically $ modifyTVar' (CS.msgSentViaProxy cs) (+ 1)
-                      PRES r <$ inc own pSuccesses
-                  Left e -> ERR (smpProxyError e) <$ case e of
-                    PCEProtocolError {} -> inc own pSuccesses
-                    _ -> inc own pErrorsOther
-              else Just (ERR $ transportErr TEVersion) <$ inc own pErrorsCompat
-            where
-              THandleParams {thVersion = v} = thParams smp
-          Nothing -> inc False pRequests >> inc False pErrorsConnect $> Just (ERR $ PROXY NO_SESSION)
-      where
-        forkProxiedCmd :: M BrokerMsg -> M (Maybe BrokerMsg)
-        forkProxiedCmd cmdAction = do
-          bracket_ wait signal . forkClient clnt (B.unpack $ "client $" <> encode sessionId <> " proxy") $ do
-            -- commands MUST be processed under a reasonable timeout or the client would halt
-            cmdAction >>= \t -> reply [(corrId, sessId, t)]
-          pure Nothing
-          where
-            wait = do
-              ServerConfig {serverClientConcurrency} <- asks config
-              atomically $ do
-                used <- readTVar procThreads
-                when (used >= serverClientConcurrency) retry
-                writeTVar procThreads $! used + 1
-            signal = atomically $ modifyTVar' procThreads (\t -> t - 1)
-    transportErr :: TransportError -> ErrorType
-    transportErr = PROXY . BROKER . TRANSPORT
-    mkIncProxyStats :: MonadIO m => ProxyStats -> ProxyStats -> OwnServer -> (ProxyStats -> TVar Int) -> m ()
-    mkIncProxyStats ps psOwn = \own sel -> do
-      atomically $ modifyTVar' (sel ps) (+ 1)
-      when own $ atomically $ modifyTVar' (sel psOwn) (+ 1)
-    processCommand :: (Maybe QueueRec, Transmission Cmd) -> M (Maybe (Transmission BrokerMsg))
-    processCommand (qr_, (corrId, queueId, cmd)) = case cmd of
-      Cmd SProxiedClient command -> processProxiedCmd (corrId, queueId, command)
-      Cmd SSender command -> Just <$> case command of
-        SEND flags msgBody -> withQueue $ \qr -> sendMessage qr flags msgBody
-        PING -> pure (corrId, "", PONG)
-        RFWD encBlock -> (corrId, "",) <$> processForwardedCommand encBlock
-      Cmd SNotifier NSUB -> Just <$> subscribeNotifications
-      Cmd SRecipient command -> do
-        st <- asks queueStore
-        Just <$> case command of
-          NEW rKey dhKey auth subMode ->
-            ifM
-              allowNew
-              (createQueue st rKey dhKey subMode)
-              (pure (corrId, queueId, ERR AUTH))
-            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 dhKey -> addQueueNotifier_ st nKey dhKey
-          NDEL -> deleteQueueNotifier_ st
-          OFF -> suspendQueue_ st
-          DEL -> delQueueAndMsgs st
-          QUE -> withQueue getQueueInfo
+    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 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 auth subMode ->
+              ifM
+                allowNew
+                (createQueue st rKey dhKey subMode)
+                (pure (corrId, queueId, ERR AUTH))
+              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 dhKey -> addQueueNotifier_ st nKey dhKey
+            NDEL -> deleteQueueNotifier_ st
+            OFF -> suspendQueue_ st
+            DEL -> delQueueAndMsgs st
      where
        createQueue :: QueueStore -> RcvPublicAuthKey -> RcvPublicDhKey -> SubscriptionMode -> M (Transmission BrokerMsg)
        createQueue st recipientKey dhKey subMode = time "NEW" $ do
-          -- TODO: read client Q rate
-          -- TODO: read server Q rate for peerId
-          -- TODO: read global server Q rate
-          -- TODO: add throttling delay/blackhole request if needed
          (rcvPublicDhKey, privDhKey) <- atomically . C.generateKeyPair =<< asks random
          let rcvDhSecret = C.dh' dhKey privDhKey
              qik (rcvId, sndId) = QIK {rcvId, sndId, rcvPublicDhKey}
@@ -921,9 +680,6 @@ client thParams' clnt@Client {clientId, peerId, subscriptions, ntfSubscriptions,
                  stats <- asks serverStats
                  atomically $ modifyTVar' (qCreated stats) (+ 1)
                  atomically $ modifyTVar' (qCount stats) (+ 1)
-                  withClientStatsId $ \cs -> atomically $ modifyTVar' (CS.qCreated cs) $ S.insert rId
-                  -- TODO: increment current Q counter in IP timeline
-                  -- TODO: increment current Q counter in server timeline
                  case subMode of
                    SMOnlyCreate -> pure ()
                    SMSubscribe -> void $ subscribeQueue qr rId
@@ -977,19 +733,15 @@ client thParams' clnt@Client {clientId, peerId, subscriptions, ntfSubscriptions,

        subscribeQueue :: QueueRec -> RecipientId -> M (Transmission BrokerMsg)
        subscribeQueue qr rId = do
-          stats <- asks serverStats
          atomically (TM.lookup rId subscriptions) >>= \case
-            Nothing -> do
-              atomically $ modifyTVar' (qSub stats) (+ 1)
+            Nothing ->
              newSub >>= deliver
            Just sub ->
              readTVarIO sub >>= \case
-                Sub {subThread = ProhibitSub} -> do
+                Sub {subThread = ProhibitSub} ->
                  -- cannot use SUB in the same connection where GET was used
-                  atomically $ modifyTVar' (qSubProhibited stats) (+ 1)
                  pure (corrId, rId, ERR $ CMD PROHIBITED)
-                s -> do
-                  atomically $ modifyTVar' (qSubDuplicate stats) (+ 1)
+                s ->
                  atomically (tryTakeTMVar $ delivered s) >> deliver sub
          where
            newSub :: M (TVar Sub)
@@ -1080,61 +832,33 @@ client thParams' clnt@Client {clientId, peerId, subscriptions, ntfSubscriptions,
                when (notification msgFlags) $ do
                  atomically $ modifyTVar' (msgRecvNtf stats) (+ 1)
                  atomically $ updatePeriodStats (activeQueuesNtf stats) queueId
-                senders' <- asks sendSignedClients
-                stats' <- asks clientStats
-                atomically $ do
-                  sender_ <- mapM readTVar =<< TM.lookup (recipientId qr) senders'
-                  forM_ sender_ $ \statsId -> do
-                    cs_ <- IM.lookup statsId <$> readTVar stats'
-                    forM_ cs_ $ \cs -> modifyTVar' (CS.msgDeliveredSigned cs) (+ 1)

        sendMessage :: QueueRec -> MsgFlags -> MsgBody -> M (Transmission BrokerMsg)
        sendMessage qr msgFlags msgBody
-          | B.length msgBody > maxMessageLength thVersion = do
-              stats <- asks serverStats
-              atomically $ modifyTVar' (msgSentLarge stats) (+ 1)
-              pure $ err LARGE_MSG
-          | otherwise = do
-              stats <- asks serverStats
-              case status qr of
-                QueueOff -> do
-                  atomically $ modifyTVar' (msgSentAuth stats) (+ 1)
-                  pure $ err AUTH
-                QueueActive ->
-                  case C.maxLenBS msgBody of
-                    Left _ -> pure $ err LARGE_MSG
-                    Right body -> do
-                      -- TODO: read client S rate
-                      -- TODO: read server S rate for peerId
-                      -- TODO: read global server S rate
-                      -- TODO: add throttling delay/blackhole request if needed
-                      msg_ <- time "SEND" $ do
-                        q <- getStoreMsgQueue "SEND" $ recipientId qr
-                        expireMessages q
-                        atomically . writeMsg q =<< mkMessage body
-                      case msg_ of
-                        Nothing -> do
-                          atomically $ modifyTVar' (msgSentQuota stats) (+ 1)
-                          pure $ err QUOTA
-                        Just msg -> time "SEND ok" $ do
-                          when (notification msgFlags) $ do
-                            atomically . trySendNotification msg =<< asks random
-                            atomically $ modifyTVar' (msgSentNtf stats) (+ 1)
-                            atomically $ updatePeriodStats (activeQueuesNtf stats) (recipientId qr)
-                          atomically $ modifyTVar' (msgSent stats) (+ 1)
-                          atomically $ modifyTVar' (msgCount stats) (+ 1)
-                          atomically $ updatePeriodStats (activeQueues stats) (recipientId qr)
-                          case senderKey qr of
-                            Nothing -> withClientStatsId $ \cs -> atomically $ modifyTVar' (CS.msgSentUnsigned cs) (+ 1)
-                            Just _secured -> do
-                              withMergedClientStatsId qr $ \cs -> do
-                                atomically $ modifyTVar' (CS.qSentSigned cs) $ S.insert (recipientId qr)
-                                atomically $ modifyTVar' (CS.msgSentSigned cs) (+ 1)
-                          -- TODO: increment current S counter in IP timeline
-                          -- TODO: increment current S counter in server timeline
-                          pure ok
+          | B.length msgBody > maxMessageLength = pure $ err LARGE_MSG
+          | 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
+                        stats <- asks serverStats
+                        when (notification msgFlags) $ do
+                          atomically . trySendNotification msg =<< asks random
+                          atomically $ modifyTVar' (msgSentNtf stats) (+ 1)
+                          atomically $ updatePeriodStats (activeQueuesNtf stats) (recipientId qr)
+                        atomically $ modifyTVar' (msgSent stats) (+ 1)
+                        atomically $ modifyTVar' (msgCount stats) (+ 1)
+                        atomically $ updatePeriodStats (activeQueues stats) (recipientId qr)
+                        pure ok
          where
-            THandleParams {thVersion} = thParams'
            mkMessage :: C.MaxLenBS MaxMessageLen -> M Message
            mkMessage body = do
              msgId <- randomId =<< asks (msgIdBytes . config)
@@ -1169,58 +893,6 @@ client thParams' clnt@Client {clientId, peerId, subscriptions, ntfSubscriptions,
                  encNMsgMeta = C.cbEncrypt rcvNtfDhSecret cbNonce (smpEncode msgMeta) 128
              pure . (cbNonce,) $ fromRight "" encNMsgMeta

-        processForwardedCommand :: EncFwdTransmission -> M BrokerMsg
-        processForwardedCommand (EncFwdTransmission s) = fmap (either ERR id) . runExceptT $ do
-          THAuthServer {serverPrivKey, sessSecret'} <- maybe (throwE $ transportErr TENoServerAuth) pure (thAuth thParams')
-          sessSecret <- maybe (throwE $ transportErr TENoServerAuth) pure sessSecret'
-          let proxyNonce = C.cbNonce $ bs corrId
-          s' <- liftEitherWith (const CRYPTO) $ C.cbDecryptNoPad sessSecret proxyNonce s
-          FwdTransmission {fwdCorrId, fwdVersion, fwdKey, fwdTransmission = EncTransmission et} <- liftEitherWith (const $ CMD SYNTAX) $ smpDecode s'
-          let clientSecret = C.dh' fwdKey serverPrivKey
-              clientNonce = C.cbNonce $ bs fwdCorrId
-          b <- liftEitherWith (const CRYPTO) $ C.cbDecrypt clientSecret clientNonce et
-          let clntTHParams = smpTHParamsSetVersion fwdVersion thParams'
-          -- only allowing single forwarded transactions
-          t' <- case tParse clntTHParams b of
-            t :| [] -> pure $ tDecodeParseValidate clntTHParams t
-            _ -> throwE BLOCK
-          let clntThAuth = Just $ THAuthServer {serverPrivKey, sessSecret' = Just clientSecret}
-          -- process forwarded SEND
-          r <-
-            lift (rejectOrVerify clntThAuth t') >>= \case
-              Left r -> pure r
-              Right t''@(_, (corrId', entId', cmd')) -> case cmd' of
-                Cmd SSender SEND {} ->
-                  -- Left will not be returned by processCommand, as only SEND command is allowed
-                  fromMaybe (corrId', entId', ERR INTERNAL) <$> lift (processCommand t'')
-                _ ->
-                  pure (corrId', entId', ERR $ CMD PROHIBITED)
-          -- encode response
-          r' <- case batchTransmissions (batch clntTHParams) (blockSize clntTHParams) [Right (Nothing, encodeTransmission clntTHParams r)] of
-            [] -> throwE INTERNAL -- at least 1 item is guaranteed from NonEmpty/Right
-            TBError _ _ : _ -> throwE BLOCK
-            TBTransmission b' _ : _ -> pure b'
-            TBTransmissions b' _ _ : _ -> pure b'
-          -- encrypt to client
-          r2 <- liftEitherWith (const BLOCK) $ EncResponse <$> C.cbEncrypt clientSecret (C.reverseNonce clientNonce) r' paddedProxiedMsgLength
-          -- encrypt to proxy
-          let fr = FwdResponse {fwdCorrId, fwdResponse = r2}
-              r3 = EncFwdResponse $ C.cbEncryptNoPad sessSecret (C.reverseNonce proxyNonce) (smpEncode fr)
-          stats <- asks serverStats
-          atomically $ modifyTVar' (pMsgFwdsRecv stats) (+ 1)
-          pure $ RRES r3
-          where
-            rejectOrVerify :: Maybe (THandleAuth 'TServer) -> SignedTransmission ErrorType Cmd -> M (Either (Transmission BrokerMsg) (Maybe QueueRec, Transmission Cmd))
-            rejectOrVerify clntThAuth (tAuth, authorized, (corrId', entId', cmdOrError)) =
-              case cmdOrError of
-                Left e -> pure $ Left (corrId', entId', ERR e)
-                Right cmd'@(Cmd SSender SEND {}) -> verified <$> verifyTransmission ((,C.cbNonce (bs corrId')) <$> clntThAuth) tAuth authorized entId' cmd'
-                  where
-                    verified = \case
-                      VRVerified qr -> Right (qr, (corrId', entId', cmd'))
-                      VRFailed -> Left (corrId', entId', ERR AUTH)
-                Right _ -> pure $ Left (corrId', entId', ERR $ CMD PROHIBITED)
-
        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
@@ -1229,10 +901,9 @@ client thParams' clnt@Client {clientId, peerId, subscriptions, ntfSubscriptions,
                Just msg ->
                  let encMsg = encryptMsg qr msg
                   in atomically (setDelivered s msg) $> (corrId, rId, MSG encMsg)
-                _ -> forkSub $> resp
-            _ -> pure resp
+                _ -> forkSub $> ok
+            _ -> pure ok
          where
-            resp = (corrId, rId, OK)
            forkSub :: M ()
            forkSub = do
              atomically . modifyTVar' sub $ \s -> s {subThread = SubPending}
@@ -1281,26 +952,6 @@ client thParams' clnt@Client {clientId, peerId, subscriptions, ntfSubscriptions,
            Right q -> updateDeletedStats q $> ok
            Left e -> pure $ err e

-        getQueueInfo :: QueueRec -> M (Transmission BrokerMsg)
-        getQueueInfo QueueRec {senderKey, notifier} = do
-          q@MsgQueue {size} <- getStoreMsgQueue "getQueueInfo" queueId
-          info <- atomically $ do
-            qiSub <- TM.lookup queueId subscriptions >>= mapM mkQSub
-            qiSize <- readTVar size
-            qiMsg <- toMsgInfo <$$> tryPeekMsg q
-            pure QueueInfo {qiSnd = isJust senderKey, qiNtf = isJust notifier, qiSub, qiSize, qiMsg}
-          pure (corrId, queueId, INFO info)
-          where
-            mkQSub sub = do
-              Sub {subThread, delivered} <- readTVar sub
-              let qSubThread = case subThread of
-                    NoSub -> QNoSub
-                    SubPending -> QSubPending
-                    SubThread _ -> QSubThread
-                    ProhibitSub -> QProhibitSub
-              qDelivered <- decodeLatin1 . encode <$$> tryReadTMVar delivered
-              pure QSub {qSubThread, qDelivered}
-
        ok :: Transmission BrokerMsg
        ok = (corrId, queueId, OK)

@@ -1310,62 +961,6 @@ client thParams' clnt@Client {clientId, peerId, subscriptions, ntfSubscriptions,
        okResp :: Either ErrorType () -> Transmission BrokerMsg
        okResp = either err $ const ok

-    -- missing clientId entry means the client is exempt from stats
-    withClientStatsId_ statsIds' getCS = IM.lookup clientId <$> readTVar statsIds' >>= mapM getCS
-
-    withClientStatsId updateCS = do
-      statsIds' <- asks statsClients
-      stats' <- asks clientStats
-      now <- liftIO getCurrentTime
-      atomically (withClientStatsId_ statsIds' $ getClientStats stats' now) >>= mapM_ updateCS
-
-    getClientStats stats' now statsId = do
-      stats <- readTVar stats'
-      case IM.lookup statsId stats of
-        Nothing -> do
-          new <- CS.newClientStats newTVar peerId now
-          writeTVar stats' $ IM.insert statsId new stats
-          pure new
-        Just cs -> cs <$ writeTVar (CS.updatedAt cs) now
-
-    withMergedClientStatsId qr updateCS = do
-      senders' <- asks sendSignedClients
-      statsIds' <- asks statsClients
-      stats' <- asks clientStats
-      now <- liftIO getCurrentTime
-      atomically (withClientStatsId_ statsIds' $ getMergeClientStats senders' statsIds' stats' now qr) >>= mapM_ updateCS
-
-    getMergeClientStats senders' statsIds' stats' now qr currentStatsId = do
-      senders <- readTVar senders'
-      statsId <- case M.lookup (recipientId qr) senders of
-        Nothing -> do
-          newOwner <- newTVar currentStatsId
-          writeTVar senders' $ M.insert (recipientId qr) newOwner senders
-          pure currentStatsId
-        Just sender -> do
-          prevStatsId <- readTVar sender
-          unless (prevStatsId == currentStatsId) $ do
-            modifyTVar' statsIds' $ IM.insert clientId prevStatsId
-            qsToTransfer <- mergeClientStats stats' prevStatsId currentStatsId
-            unless (S.null qsToTransfer) $ writeTVar senders' $ S.foldl' (\os k -> M.insert k sender os) senders qsToTransfer
-          pure prevStatsId
-      getClientStats stats' now statsId
-
-    mergeClientStats :: TVar (IntMap CS.ClientStats) -> CS.ClientStatsId -> CS.ClientStatsId -> STM (Set RecipientId)
-    mergeClientStats stats' prevId curId = do
-      stats <- readTVar stats'
-      case (IM.lookup prevId stats, IM.lookup curId stats) of
-        (_, Nothing) -> pure mempty
-        (Nothing, Just cur@CS.ClientStats {qCreated}) -> do
-          writeTVar stats' $ IM.insert prevId cur (IM.delete curId stats)
-          readTVar qCreated
-        (Just prev, Just cur) -> do
-          curData@CS.ClientStatsData {_qCreated} <- CS.readClientStatsData readTVar cur
-          prevData <- CS.readClientStatsData readTVar prev
-          CS.writeClientStatsData prev $ CS.mergeClientStatsData prevData curData
-          writeTVar stats' $ IM.delete curId stats
-          pure _qCreated
-
 updateDeletedStats :: QueueRec -> M ()
 updateDeletedStats q = do
  stats <- asks serverStats
@@ -254,7 +254,7 @@ onOffPrompt prompt def =
      "N" -> pure False
      _ -> putStrLn "Invalid input, please enter 'y' or 'n'" >> onOffPrompt prompt def

-onOff :: Bool -> Text
+onOff :: Bool -> String
 onOff True = "on"
 onOff _ = "off"

@@ -16,7 +16,6 @@ data ControlProtocol
  | CPResume
  | CPClients
  | CPStats
-  | CPStatsClients
  | CPStatsRTS
  | CPThreads
  | CPSockets
@@ -34,7 +33,6 @@ instance StrEncoding ControlProtocol where
    CPResume -> "resume"
    CPClients -> "clients"
    CPStats -> "stats"
-    CPStatsClients -> "stats-clients"
    CPStatsRTS -> "stats-rts"
    CPThreads -> "threads"
    CPSockets -> "sockets"
@@ -51,7 +49,6 @@ instance StrEncoding ControlProtocol where
      "resume" -> pure CPResume
      "clients" -> pure CPClients
      "stats" -> pure CPStats
-      "stats-clients" -> pure CPStatsClients
      "stats-rts" -> pure CPStatsRTS
      "threads" -> pure CPThreads
      "sockets" -> pure CPSockets
@@ -2,7 +2,6 @@
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE StrictData #-}

 module Simplex.Messaging.Server.Env.STM where

@@ -16,31 +15,25 @@ import qualified Data.IntMap.Strict as IM
 import Data.List.NonEmpty (NonEmpty)
 import Data.Map.Strict (Map)
 import qualified Data.Map.Strict as M
-import Data.Maybe (isJust, isNothing)
 import Data.Time.Clock (getCurrentTime)
-import Data.Time.Clock.POSIX (getPOSIXTime)
 import Data.Time.Clock.System (SystemTime)
 import Data.X509.Validation (Fingerprint (..))
 import Network.Socket (ServiceName)
 import qualified Network.TLS as T
 import Numeric.Natural
 import Simplex.Messaging.Agent.Lock
-import Simplex.Messaging.Client.Agent (SMPClientAgent, SMPClientAgentConfig, newSMPClientAgent)
 import Simplex.Messaging.Crypto (KeyHash (..))
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Protocol
 import Simplex.Messaging.Server.Expiration
-import Simplex.Messaging.Server.Information
 import Simplex.Messaging.Server.MsgStore.STM
 import Simplex.Messaging.Server.QueueStore (NtfCreds (..), QueueRec (..))
 import Simplex.Messaging.Server.QueueStore.STM
 import Simplex.Messaging.Server.Stats
-import Simplex.Messaging.Server.Stats.Client (ClientStats, ClientStatsC, ClientStatsId)
-import Simplex.Messaging.Server.Stats.Timeline (Timeline, newTimeline, perMinute)
 import Simplex.Messaging.Server.StoreLog
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
-import Simplex.Messaging.Transport (ATransport, PeerId, VersionRangeSMP, VersionSMP)
+import Simplex.Messaging.Transport (ATransport, VersionRangeSMP, VersionSMP)
 import Simplex.Messaging.Transport.Server (SocketState, TransportServerConfig, alpn, loadFingerprint, loadTLSServerParams, newSocketState)
 import System.IO (IOMode (..))
 import System.Mem.Weak (Weak)
@@ -77,12 +70,6 @@ data ServerConfig = ServerConfig
    serverStatsLogFile :: FilePath,
    -- | file to save and restore stats
    serverStatsBackupFile :: Maybe FilePath,
-    -- | rate limit monitoring interval / bucket width, seconds
-    rateStatsInterval :: Maybe Int64,
-    -- | number of rate limit samples to keep
-    rateStatsLength :: Int,
-    rateStatsLogFile :: FilePath,
-    rateStatsBackupFile :: Maybe FilePath,
    -- | CA certificate private key is not needed for initialization
    caCertificateFile :: FilePath,
    privateKeyFile :: FilePath,
@@ -92,13 +79,7 @@ data ServerConfig = ServerConfig
    -- | TCP transport config
    transportConfig :: TransportServerConfig,
    -- | run listener on control port
-    controlPort :: Maybe ServiceName,
-    -- | SMP proxy config
-    smpAgentCfg :: SMPClientAgentConfig,
-    allowSMPProxy :: Bool, -- auth is the same with `newQueueBasicAuth`
-    serverClientConcurrency :: Int,
-    -- | server public information
-    information :: Maybe ServerPublicInfo
+    controlPort :: Maybe ServiceName
  }

 defMsgExpirationDays :: Int64
@@ -118,12 +99,8 @@ defaultInactiveClientExpiration =
      checkInterval = 3600 -- seconds, 1 hours
    }

-defaultProxyClientConcurrency :: Int
-defaultProxyClientConcurrency = 32
-
 data Env = Env
  { config :: ServerConfig,
-    serverInfo :: ServerInformation,
    server :: Server,
    serverIdentity :: KeyHash,
    queueStore :: QueueStore,
@@ -132,16 +109,9 @@ data Env = Env
    storeLog :: Maybe (StoreLog 'WriteMode),
    tlsServerParams :: T.ServerParams,
    serverStats :: ServerStats,
-    qCreatedByIp :: Timeline Int,
-    msgSentByIp :: Timeline Int,
-    clientStats :: TVar (IntMap ClientStats), -- transitive session stats
-    statsClients :: TVar (IntMap ClientStatsId), -- reverse index from sockets
-    sendSignedClients :: TMap RecipientId (TVar ClientStatsId), -- reverse index from queues to their senders
-    serverRates :: TVar [ClientStatsC (Distribution Int)], -- current (head) + historical distributions extracted from clientStats for logging and assessing ClientStatsData deviations
    sockets :: SocketState,
-    clientSeq :: TVar ClientId,
-    clients :: TVar (IntMap Client),
-    proxyAgent :: ProxyAgent -- senders served on this proxy
+    clientSeq :: TVar Int,
+    clients :: TVar (IntMap Client)
  }

 data Server = Server
@@ -152,21 +122,13 @@ data Server = Server
    savingLock :: Lock
  }

-newtype ProxyAgent = ProxyAgent
-  { smpAgent :: SMPClientAgent
-  }
-
-type ClientId = Int
-
 data Client = Client
-  { clientId :: ClientId,
-    peerId :: PeerId, -- send updates for this Id to time series
+  { clientId :: Int,
    subscriptions :: TMap RecipientId (TVar Sub),
    ntfSubscriptions :: TMap NotifierId (),
    rcvQ :: TBQueue (NonEmpty (Maybe QueueRec, Transmission Cmd)),
    sndQ :: TBQueue (NonEmpty (Transmission BrokerMsg)),
    msgQ :: TBQueue (NonEmpty (Transmission BrokerMsg)),
-    procThreads :: TVar Int,
    endThreads :: TVar (IntMap (Weak ThreadId)),
    endThreadSeq :: TVar Int,
    thVersion :: VersionSMP,
@@ -193,21 +155,20 @@ newServer = do
  savingLock <- createLock
  return Server {subscribedQ, subscribers, ntfSubscribedQ, notifiers, savingLock}

-newClient :: PeerId -> TVar ClientId -> Natural -> VersionSMP -> ByteString -> SystemTime -> STM Client
-newClient peerId nextClientId qSize thVersion sessionId createdAt = do
+newClient :: TVar Int -> Natural -> VersionSMP -> ByteString -> SystemTime -> STM Client
+newClient nextClientId qSize thVersion sessionId createdAt = do
  clientId <- stateTVar nextClientId $ \next -> (next, next + 1)
  subscriptions <- TM.empty
  ntfSubscriptions <- TM.empty
  rcvQ <- newTBQueue qSize
  sndQ <- newTBQueue qSize
  msgQ <- newTBQueue qSize
-  procThreads <- newTVar 0
  endThreads <- newTVar IM.empty
  endThreadSeq <- newTVar 0
  connected <- newTVar True
  rcvActiveAt <- newTVar createdAt
  sndActiveAt <- newTVar createdAt
-  return Client {peerId, clientId, subscriptions, ntfSubscriptions, rcvQ, sndQ, msgQ, procThreads, endThreads, endThreadSeq, thVersion, sessionId, connected, createdAt, rcvActiveAt, sndActiveAt}
+  return Client {clientId, subscriptions, ntfSubscriptions, rcvQ, sndQ, msgQ, endThreads, endThreadSeq, thVersion, sessionId, connected, createdAt, rcvActiveAt, sndActiveAt}

 newSubscription :: SubscriptionThread -> STM Sub
 newSubscription subThread = do
@@ -215,7 +176,7 @@ newSubscription subThread = do
  return Sub {subThread, delivered}

 newEnv :: ServerConfig -> IO Env
-newEnv config@ServerConfig {caCertificateFile, certificateFile, privateKeyFile, storeLogFile, smpAgentCfg, transportConfig, information, messageExpiration} = do
+newEnv config@ServerConfig {caCertificateFile, certificateFile, privateKeyFile, storeLogFile, transportConfig} = do
  server <- atomically newServer
  queueStore <- atomically newQueueStore
  msgStore <- atomically newMsgStore
@@ -228,15 +189,7 @@ newEnv config@ServerConfig {caCertificateFile, certificateFile, privateKeyFile,
  sockets <- atomically newSocketState
  clientSeq <- newTVarIO 0
  clients <- newTVarIO mempty
-  proxyAgent <- atomically $ newSMPProxyAgent smpAgentCfg random
-  now <- getPOSIXTime
-  qCreatedByIp <- atomically $ newTimeline perMinute now
-  msgSentByIp <- atomically $ newTimeline perMinute now
-  clientStats <- newTVarIO mempty
-  statsClients <- newTVarIO mempty
-  sendSignedClients <- newTVarIO mempty
-  serverRates <- newTVarIO mempty
-  return Env {config, serverInfo, server, serverIdentity, queueStore, msgStore, random, storeLog, tlsServerParams, serverStats, sockets, clientSeq, clients, proxyAgent, qCreatedByIp, msgSentByIp, clientStats, statsClients, sendSignedClients, serverRates}
+  return Env {config, server, serverIdentity, queueStore, msgStore, random, storeLog, tlsServerParams, serverStats, sockets, clientSeq, clients}
  where
    restoreQueues :: QueueStore -> FilePath -> IO (StoreLog 'WriteMode)
    restoreQueues QueueStore {queues, senders, notifiers} f = do
@@ -252,25 +205,3 @@ newEnv config@ServerConfig {caCertificateFile, certificateFile, privateKeyFile,
    addNotifier q = case notifier q of
      Nothing -> id
      Just NtfCreds {notifierId} -> M.insert notifierId (recipientId q)
-    serverInfo =
-      ServerInformation
-        { information,
-          config =
-            ServerPublicConfig
-              { persistence,
-                messageExpiration = ttl <$> messageExpiration,
-                statsEnabled = isJust $ logStatsInterval config,
-                newQueuesAllowed = allowNewQueues config,
-                basicAuthEnabled = isJust $ newQueueBasicAuth config
-              }
-        }
-      where
-        persistence
-          | isNothing storeLogFile = SPMMemoryOnly
-          | isJust (storeMsgsFile config) = SPMMessages
-          | otherwise = SPMQueues
-
-newSMPProxyAgent :: SMPClientAgentConfig -> TVar ChaChaDRG -> STM ProxyAgent
-newSMPProxyAgent smpAgentCfg random = do
-  smpAgent <- newSMPClientAgent smpAgentCfg random
-  pure ProxyAgent {smpAgent}
@@ -1,76 +0,0 @@
-{-# LANGUAGE DataKinds #-}
-{-# LANGUAGE DuplicateRecordFields #-}
-{-# LANGUAGE StrictData #-}
-{-# LANGUAGE TemplateHaskell #-}
-
-module Simplex.Messaging.Server.Information where
-
-import qualified Data.Aeson.TH as J
-import Data.Int (Int64)
-import Data.Text (Text)
-import Simplex.Messaging.Agent.Protocol (ConnectionMode (..), ConnectionRequestUri)
-import Simplex.Messaging.Parsers (defaultJSON, dropPrefix, enumJSON)
-
-data ServerInformation = ServerInformation
-  { config :: ServerPublicConfig,
-    information :: Maybe ServerPublicInfo
-  }
-  deriving (Show)
-
-- based on server configuration
-data ServerPublicConfig = ServerPublicConfig
-  { persistence :: ServerPersistenceMode,
-    messageExpiration :: Maybe Int64,
-    statsEnabled :: Bool,
-    newQueuesAllowed :: Bool,
-    basicAuthEnabled :: Bool -- server is private if enabled
-  }
-  deriving (Show)
-
-- based on INFORMATION section of INI file
-data ServerPublicInfo = ServerPublicInfo
-  { sourceCode :: Text, -- note that this property is not optional, in line with AGPLv3 license
-    usageConditions :: Maybe ServerConditions,
-    operator :: Maybe Entity,
-    website :: Maybe Text,
-    adminContacts :: Maybe ServerContactAddress,
-    complaintsContacts :: Maybe ServerContactAddress,
-    hosting :: Maybe Entity,
-    serverCountry :: Maybe Text
-  }
-  deriving (Show)
-
-data ServerPersistenceMode = SPMMemoryOnly | SPMQueues | SPMMessages
-  deriving (Show)
-
-data ServerConditions = ServerConditions {conditions :: Text, amendments :: Maybe Text}
-  deriving (Show)
-
-data Entity = Entity {name :: Text, country :: Maybe Text}
-  deriving (Show)
-
-data ServerContactAddress = ServerContactAddress
-  { simplex :: Maybe (ConnectionRequestUri 'CMContact),
-    email :: Maybe Text, -- it is recommended that it matches DNS email address, if either is present
-    pgp :: Maybe PGPKey
-  }
-  deriving (Show)
-
-data PGPKey = PGPKey {pkURI :: Text, pkFingerprint :: Text}
-  deriving (Show)
-
-$(J.deriveJSON (enumJSON $ dropPrefix "SPM") ''ServerPersistenceMode)
-
-$(J.deriveJSON defaultJSON ''ServerConditions)
-
-$(J.deriveJSON defaultJSON ''Entity)
-
-$(J.deriveJSON defaultJSON ''PGPKey)
-
-$(J.deriveJSON defaultJSON ''ServerContactAddress)
-
-$(J.deriveJSON defaultJSON ''ServerPublicConfig)
-
-$(J.deriveJSON defaultJSON ''ServerPublicInfo)
-
-$(J.deriveJSON defaultJSON ''ServerInformation)
@@ -5,56 +5,37 @@
 {-# LANGUAGE OverloadedLists #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PatternSynonyms #-}
-{-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE StrictData #-}
-{-# LANGUAGE TypeApplications #-}

 module Simplex.Messaging.Server.Main where

 import Control.Concurrent.STM
-import Control.Logger.Simple
-import Control.Monad (void, when, (<$!>))
-import Data.ByteString.Char8 (ByteString)
+import Control.Monad (void)
 import qualified Data.ByteString.Char8 as B
-import Data.Char (isAlpha, isAscii, toUpper)
 import Data.Functor (($>))
-import Data.Ini (Ini, lookupValue, readIniFile)
-import Data.List (find, isPrefixOf)
-import qualified Data.List.NonEmpty as L
-import Data.Maybe (fromMaybe, isJust, isNothing)
-import Data.Text (Text)
+import Data.Ini (lookupValue, readIniFile)
+import Data.Maybe (fromMaybe)
 import qualified Data.Text as T
 import Data.Text.Encoding (encodeUtf8)
-import qualified Data.Text.IO as T
 import Network.Socket (HostName)
 import Options.Applicative
-import Simplex.Messaging.Agent.Protocol (connReqUriP')
-import Simplex.Messaging.Client (HostMode (..), NetworkConfig (..), ProtocolClientConfig (..), SocksMode (..), defaultNetworkConfig)
-import Simplex.Messaging.Client.Agent (SMPClientAgentConfig (..), defaultSMPClientAgentConfig)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Parsers (parseAll)
 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 (..), defMsgExpirationDays, defaultInactiveClientExpiration, defaultMessageExpiration, defaultProxyClientConcurrency)
+import Simplex.Messaging.Server.Env.STM (ServerConfig (..), defMsgExpirationDays, defaultInactiveClientExpiration, defaultMessageExpiration)
 import Simplex.Messaging.Server.Expiration
-import Simplex.Messaging.Server.Information
-import Simplex.Messaging.Transport (batchCmdsSMPVersion, sendingProxySMPVersion, simplexMQVersion, supportedSMPHandshakes, supportedServerSMPRelayVRange)
+import Simplex.Messaging.Transport (simplexMQVersion, supportedSMPHandshakes, supportedServerSMPRelayVRange)
 import Simplex.Messaging.Transport.Client (TransportHost (..))
 import Simplex.Messaging.Transport.Server (TransportServerConfig (..), defaultTransportServerConfig)
-import Simplex.Messaging.Util (eitherToMaybe, safeDecodeUtf8, tshow)
-import Simplex.Messaging.Version (mkVersionRange)
+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 = smpServerCLI_ (\_ _ _ -> pure ()) (\_ -> pure ())
-
-smpServerCLI_ :: (ServerInformation -> Maybe TransportHost -> FilePath -> IO ()) -> (EmbeddedWebParams -> IO ()) -> FilePath -> FilePath -> IO ()
-smpServerCLI_ generateSite serveStaticFiles cfgPath logPath =
+smpServerCLI cfgPath logPath =
  getCliCommand' (cliCommandP cfgPath logPath iniFile) serverVersion >>= \case
    Init opts ->
      doesFileExist iniFile >>= \case
@@ -79,10 +60,7 @@ smpServerCLI_ generateSite serveStaticFiles cfgPath logPath =
    defaultServerPort = "5223"
    executableName = "smp-server"
    storeLogFilePath = combine logPath "smp-server-store.log"
-    httpsCertFile = combine cfgPath "web.cert"
-    httpsKeyFile = combine cfgPath "web.key"
-    defaultStaticPath = combine logPath "www"
-    initializeServer opts@InitOptions {ip, fqdn, sourceCode = src', webStaticPath = sp', disableWeb = noWeb', scripted}
+    initializeServer opts@InitOptions {ip, fqdn, scripted}
      | scripted = initialize opts
      | otherwise = do
          putStrLn "Use `smp-server init -h` for available options."
@@ -93,19 +71,7 @@ smpServerCLI_ generateSite serveStaticFiles cfgPath logPath =
          password <- withPrompt "'r' for random (default), 'n' - no password, or enter password: " serverPassword
          let host = fromMaybe ip fqdn
          host' <- withPrompt ("Enter server FQDN or IP address for certificate (" <> host <> "): ") getLine
-          sourceCode' <- withPrompt ("Enter server source code URI (" <> maybe simplexmqSource T.unpack src' <> "): ") getServerSourceCode
-          staticPath' <- withPrompt ("Enter path to store generated static site with server information (" <> fromMaybe defaultStaticPath sp' <> "): ") getLine
-          enableWeb <- onOffPrompt "Enable built-in web server for static site" (not noWeb')
-          initialize
-            opts
-              { enableStoreLog,
-                logStats,
-                fqdn = if null host' then fqdn else Just host',
-                password,
-                sourceCode = (T.pack <$> sourceCode') <|> src',
-                webStaticPath = if null staticPath' then sp' else Just staticPath',
-                disableWeb = not enableWeb
-              }
+          initialize opts {enableStoreLog, logStats, fqdn = if null host' then fqdn else Just host', password}
      where
        serverPassword =
          getLine >>= \case
@@ -116,7 +82,7 @@ smpServerCLI_ generateSite serveStaticFiles cfgPath logPath =
              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, password, sourceCode, webStaticPath, disableWeb} = do
+        initialize InitOptions {enableStoreLog, logStats, signAlgorithm, password} = do
          clearDirIfExists cfgPath
          clearDirIfExists logPath
          createDirectoryIfMissing True cfgPath
@@ -126,29 +92,26 @@ smpServerCLI_ generateSite serveStaticFiles cfgPath logPath =
          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
-          T.writeFile iniFile $ iniFileContent host basicAuth $ Just "https://github.com/simplex-chat/simplexmq"
-          putStrLn $ "Server initialized, please provide additional server information in " <> iniFile <> "."
-          putStrLn $ "Run `" <> executableName <> " start` to start server."
+          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
-          printSourceCode sourceCode
          where
            createServerPassword = \case
              ServerPassword s -> pure s
              SPRandom -> BasicAuth . strEncode <$> (atomically . C.randomBytes 32 =<< C.newRandom)
-            iniFileContent host basicAuth sourceCode' =
-              informationIniContent sourceCode'
-                <> "[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"
+            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")
-                <> ("expire_messages_days: " <> tshow defMsgExpirationDays <> "\n\n")
+                <> ("expire_messages_days: " <> show defMsgExpirationDays <> "\n\n")
                <> "# Log daily server statistics to CSV file\n"
                <> ("log_stats: " <> onOff logStats <> "\n\n")
                <> "[AUTH]\n\
@@ -161,64 +124,33 @@ smpServerCLI_ generateSite serveStaticFiles cfgPath logPath =
                   \# 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: " <> safeDecodeUtf8 (strEncode auth)
+                      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\
                   \# control_port_admin_password:\n\
-                   \# control_port_user_password:\n\n\
+                   \# control_port_user_password:\n\
                   \[TRANSPORT]\n\
                   \# host is only used to print server address on start\n"
-                <> ("host: " <> T.pack host <> "\n")
-                <> ("port: " <> T.pack defaultServerPort <> "\n")
+                <> ("host: " <> host <> "\n")
+                <> ("port: " <> defaultServerPort <> "\n")
                <> "log_tls_errors: off\n\
                   \websockets: off\n\
                   \# control_port: 5224\n\n\
-                   \[PROXY]\n\
-                   \# Network configuration for SMP proxy client.\n\
-                   \# `host_mode` can be 'public' (default) or 'onion'.\n\
-                   \# It defines prefferred hostname for destination servers with multiple hostnames.\n\
-                   \# host_mode: public\n\
-                   \# required_host_mode: off\n\n\
-                   \# The domain suffixes of the relays you operate (space-separated) to count as separate proxy statistics.\n\
-                   \# own_server_domains: \n\n\
-                   \# SOCKS proxy port for forwarding messages to destination servers.\n\
-                   \# You may need a separate instance of SOCKS proxy for incoming single-hop requests.\n\
-                   \# socks_proxy: localhost:9050\n\n\
-                   \# `socks_mode` can be 'onion' for SOCKS proxy to be used for .onion destination hosts only (default)\n\
-                   \# or 'always' to be used for all destination hosts (can be used if it is an .onion server).\n\
-                   \# socks_mode: onion\n\n\
-                   \# Limit number of threads a client can spawn to process proxy commands in parrallel.\n"
-                <> ("# client_concurrency: " <> tshow defaultProxyClientConcurrency <> "\n\n")
-                <> "[INACTIVE_CLIENTS]\n\
+                   \[INACTIVE_CLIENTS]\n\
                   \# TTL and interval to check inactive clients\n\
                   \disconnect: off\n"
-                <> ("# ttl: " <> tshow (ttl defaultInactiveClientExpiration) <> "\n")
-                <> ("# check_interval: " <> tshow (checkInterval defaultInactiveClientExpiration) <> "\n")
-                <> "\n\n\
-                   \[WEB]\n\
-                   \# Set path to generate static mini-site for server information and qr codes/links\n"
-                <> ("static_path: " <> T.pack (fromMaybe defaultStaticPath webStaticPath) <> "\n\n")
-                <> "# Run an embedded server on this port\n\
-                   \# Onion sites can use any port and register it in the hidden service config.\n\
-                   \# Running on a port 80 may require setting process capabilities.\n"
-                <> ((if disableWeb then "# " else "") <> "http: 8000\n\n")
-                <> "# You can run an embedded TLS web server too if you provide port and cert and key files.\n\
-                   \# Not required for running relay on onion address.\n\
-                   \# https: 443\n"
-                <> ("# cert: " <> T.pack httpsCertFile <> "\n")
-                <> ("# key: " <> T.pack httpsKeyFile <> "\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 = either (const "<hostnames>") T.unpack $ lookupValue "TRANSPORT" "host" ini
          port = T.unpack $ strictIni "TRANSPORT" "port" ini
-          cfg@ServerConfig {information, transports, storeLogFile, newQueueBasicAuth, messageExpiration, inactiveClientExpiration} = serverConfig
-          sourceCode' = (\ServerPublicInfo {sourceCode} -> sourceCode) <$> information
+          cfg@ServerConfig {transports, storeLogFile, newQueueBasicAuth, messageExpiration, inactiveClientExpiration} = serverConfig
          srv = ProtoServerWithAuth (SMPServer [THDomainName host] (if port == "5223" then "" else port) (C.KeyHash fp)) newQueueBasicAuth
      printServiceInfo serverVersion srv
-      printSourceCode sourceCode'
      printServerConfig transports storeLogFile
      putStrLn $ case messageExpiration of
        Just ExpirationConfig {ttl} -> "expiring messages after " <> showTTL ttl
@@ -231,20 +163,6 @@ smpServerCLI_ generateSite serveStaticFiles cfgPath logPath =
          <> if allowNewQueues cfg
            then maybe "allowed" (const "requires password") newQueueBasicAuth
            else "NOT allowed"
-      -- print information
-      let persistence
-            | isNothing storeLogFile = SPMMemoryOnly
-            | isJust (storeMsgsFile cfg) = SPMMessages
-            | otherwise = SPMQueues
-      let config =
-            ServerPublicConfig
-              { persistence,
-                messageExpiration = ttl <$> messageExpiration,
-                statsEnabled = isJust logStats,
-                newQueuesAllowed = allowNewQueues cfg,
-                basicAuthEnabled = isJust newQueueBasicAuth
-              }
-      runWebServer ini ServerInformation {config, information}
      runSMPServer cfg
      where
        enableStoreLog = settingIsOn "STORE_LOG" "enable" ini
@@ -272,9 +190,9 @@ smpServerCLI_ generateSite serveStaticFiles cfgPath logPath =
                      _ -> enableStoreLog $> messagesPath,
              -- allow creating new queues by default
              allowNewQueues = fromMaybe True $ iniOnOff "AUTH" "new_queues" ini,
-              newQueueBasicAuth = either error id <$!> strDecodeIni "AUTH" "create_password" ini,
-              controlPortAdminAuth = either error id <$!> strDecodeIni "AUTH" "control_port_admin_password" ini,
-              controlPortUserAuth = either error id <$!> strDecodeIni "AUTH" "control_port_user_password" ini,
+              newQueueBasicAuth = either error id <$> strDecodeIni "AUTH" "create_password" ini,
+              controlPortAdminAuth = either error id <$> strDecodeIni "AUTH" "control_port_admin_password" ini,
+              controlPortUserAuth = either error id <$> strDecodeIni "AUTH" "control_port_user_password" ini,
              messageExpiration =
                Just
                  defaultMessageExpiration
@@ -290,170 +208,14 @@ smpServerCLI_ generateSite serveStaticFiles cfgPath logPath =
              logStatsStartTime = 0, -- seconds from 00:00 UTC
              serverStatsLogFile = combine logPath "smp-server-stats.daily.log",
              serverStatsBackupFile = logStats $> combine logPath "smp-server-stats.log",
-              rateStatsInterval = Just 60, -- TODO: add to options
-              rateStatsLength = 0, -- Just (24 * 60), -- TODO: add to options
-              rateStatsLogFile = combine logPath "smp-server-rates.daily.log",
-              rateStatsBackupFile = Just $ combine logPath "smp-server-rates.log",
              smpServerVRange = supportedServerSMPRelayVRange,
              transportConfig =
                defaultTransportServerConfig
                  { logTLSErrors = fromMaybe False $ iniOnOff "TRANSPORT" "log_tls_errors" ini,
                    alpn = Just supportedSMPHandshakes
                  },
-              controlPort = eitherToMaybe $ T.unpack <$> lookupValue "TRANSPORT" "control_port" ini,
-              smpAgentCfg =
-                defaultSMPClientAgentConfig
-                  { smpCfg =
-                      (smpCfg defaultSMPClientAgentConfig)
-                        { serverVRange = mkVersionRange batchCmdsSMPVersion sendingProxySMPVersion,
-                          agreeSecret = True,
-                          networkConfig =
-                            defaultNetworkConfig
-                              { socksProxy = either error id <$!> strDecodeIni "PROXY" "socks_proxy" ini,
-                                socksMode = either (const SMOnion) textToSocksMode $ lookupValue "PROXY" "socks_mode" ini,
-                                hostMode = either (const HMPublic) textToHostMode $ lookupValue "PROXY" "host_mode" ini,
-                                requiredHostMode = fromMaybe False $ iniOnOff "PROXY" "required_host_mode" ini
-                              }
-                        },
-                    ownServerDomains = either (const []) textToOwnServers $ lookupValue "PROXY" "own_server_domains" ini,
-                    persistErrorInterval = 30 -- seconds
-                  },
-              allowSMPProxy = True,
-              serverClientConcurrency = readIniDefault defaultProxyClientConcurrency "PROXY" "client_concurrency" ini,
-              information = serverPublicInfo ini
+              controlPort = either (const Nothing) (Just . T.unpack) $ lookupValue "TRANSPORT" "control_port" ini
            }
-        textToSocksMode :: Text -> SocksMode
-        textToSocksMode = \case
-          "always" -> SMAlways
-          "onion" -> SMOnion
-          s -> error . T.unpack $ "Invalid socks_mode: " <> s
-        textToHostMode :: Text -> HostMode
-        textToHostMode = \case
-          "public" -> HMPublic
-          "onion" -> HMOnionViaSocks
-          s -> error . T.unpack $ "Invalid host_mode: " <> s
-        textToOwnServers :: Text -> [ByteString]
-        textToOwnServers = map encodeUtf8 . T.words
-
-    runWebServer ini si =
-      case eitherToMaybe $ T.unpack <$> lookupValue "WEB" "static_path" ini of
-        Nothing -> logWarn "No server static path set"
-        Just webStaticPath -> do
-          let onionHost =
-                either (const Nothing) (find isOnion) $
-                  strDecode @(L.NonEmpty TransportHost) . encodeUtf8 =<< lookupValue "TRANSPORT" "host" ini
-              webHttpPort = eitherToMaybe $ read . T.unpack <$> lookupValue "WEB" "http" ini
-              webHttpsParams =
-                eitherToMaybe $ do
-                  port <- read . T.unpack <$> lookupValue "WEB" "https" ini
-                  cert <- T.unpack <$> lookupValue "WEB" "cert" ini
-                  key <- T.unpack <$> lookupValue "WEB" "key" ini
-                  pure WebHttpsParams {port, cert, key}
-          generateSite si onionHost webStaticPath
-          when (isJust webHttpPort || isJust webHttpsParams) $
-            serveStaticFiles EmbeddedWebParams {webStaticPath, webHttpPort, webHttpsParams}
-          where
-            isOnion = \case THOnionHost _ -> True; _ -> False
-
-data EmbeddedWebParams = EmbeddedWebParams
-  { webStaticPath :: FilePath,
-    webHttpPort :: Maybe Int,
-    webHttpsParams :: Maybe WebHttpsParams
-  }
-
-data WebHttpsParams = WebHttpsParams
-  { port :: Int,
-    cert :: FilePath,
-    key :: FilePath
-  }
-
-getServerSourceCode :: IO (Maybe String)
-getServerSourceCode =
-  getLine >>= \case
-    "" -> pure Nothing
-    s | "https://" `isPrefixOf` s || "http://" `isPrefixOf` s -> pure $ Just s
-    _ -> putStrLn "Invalid source code. URI should start from http:// or https://" >> getServerSourceCode
-
-simplexmqSource :: String
-simplexmqSource = "https://github.com/simplex-chat/simplexmq"
-
-informationIniContent :: Maybe Text -> Text
-informationIniContent sourceCode_ =
-  "[INFORMATION]\n\
-  \# AGPLv3 license requires that you make any source code modifications\n\
-  \# available to the end users of the server.\n\
-  \# LICENSE: https://github.com/simplex-chat/simplexmq/blob/stable/LICENSE\n\
-  \# Include correct source code URI in case the server source code is modified in any way.\n\
-  \# If any other information fields are present, source code property also MUST be present.\n\n"
-    <> (maybe "# source_code: URI" ("source_code: " <>) sourceCode_ <> "\n\n")
-    <> "# Declaring all below information is optional, any of these fields can be omitted.\n\
-       \\n\
-       \# Server usage conditions and amendments.\n\
-       \# It is recommended to use standard conditions with any amendments in a separate document.\n\
-       \# usage_conditions: https://github.com/simplex-chat/simplex-chat/blob/stable/PRIVACY.md\n\
-       \# condition_amendments: link\n\
-       \\n\
-       \# Server location and operator.\n\
-       \# server_country: ISO-3166 2-letter code\n\
-       \# operator: entity (organization or person name)\n\
-       \# operator_country: ISO-3166 2-letter code\n\
-       \# website:\n\
-       \\n\
-       \# Administrative contacts.\n\
-       \# admin_simplex: SimpleX address\n\
-       \# admin_email:\n\
-       \# admin_pgp:\n\
-       \# admin_pgp_fingerprint:\n\
-       \\n\
-       \# Contacts for complaints and feedback.\n\
-       \# complaints_simplex: SimpleX address\n\
-       \# complaints_email:\n\
-       \# complaints_pgp:\n\
-       \# complaints_pgp_fingerprint:\n\
-       \\n\
-       \# Hosting provider.\n\
-       \# hosting: entity (organization or person name)\n\
-       \# hosting_country: ISO-3166 2-letter code\n\n"
-
-serverPublicInfo :: Ini -> Maybe ServerPublicInfo
-serverPublicInfo ini = serverInfo <$!> infoValue "source_code"
-  where
-    serverInfo sourceCode =
-      ServerPublicInfo
-        { sourceCode,
-          usageConditions =
-            (\conditions -> ServerConditions {conditions, amendments = infoValue "condition_amendments"})
-              <$!> infoValue "usage_conditions",
-          serverCountry = countryValue "server_country",
-          operator = iniEntity "operator" "operator_country",
-          website = infoValue "website",
-          adminContacts = iniContacts "admin_simplex" "admin_email" "admin_pgp" "admin_pgp_fingerprint",
-          complaintsContacts = iniContacts "complaints_simplex" "complaints_email" "complaints_pgp" "complaints_pgp_fingerprint",
-          hosting = iniEntity "hosting" "hosting_country"
-        }
-    infoValue name = eitherToMaybe $ lookupValue "INFORMATION" name ini
-    iniEntity nameField countryField =
-      (\name -> Entity {name, country = countryValue countryField})
-        <$!> infoValue nameField
-    countryValue field =
-      (\cs -> if T.length cs == 2 && T.all (\c -> isAscii c && isAlpha c) cs then T.map toUpper cs else error $ "Use ISO3166 2-letter code for " <> T.unpack field)
-        <$!> infoValue field
-    iniContacts simplexField emailField pgpKeyUriField pgpKeyFingerprintField =
-      let simplex = either error id . parseAll (connReqUriP' Nothing) . encodeUtf8 <$!> eitherToMaybe (lookupValue "INFORMATION" simplexField ini)
-          email = infoValue emailField
-          pkURI_ = infoValue pgpKeyUriField
-          pkFingerprint_ = infoValue pgpKeyFingerprintField
-       in case (simplex, email, pkURI_, pkFingerprint_) of
-            (Nothing, Nothing, Nothing, _) -> Nothing
-            (Nothing, Nothing, _, Nothing) -> Nothing
-            (_, _, pkURI, pkFingerprint) -> Just ServerContactAddress {simplex, email, pgp = PGPKey <$> pkURI <*> pkFingerprint}
-
-printSourceCode :: Maybe Text -> IO ()
-printSourceCode = \case
-  Just sourceCode -> T.putStrLn $ "Server source code: " <> sourceCode
-  Nothing -> do
-    putStrLn "Warning: server source code is not specified."
-    putStrLn "Add 'source_code' property to [INFORMATION] section of INI file."

 data CliCommand
  = Init InitOptions
@@ -468,9 +230,6 @@ data InitOptions = InitOptions
    ip :: HostName,
    fqdn :: Maybe HostName,
    password :: Maybe ServerPassword,
-    sourceCode :: Maybe Text,
-    webStaticPath :: Maybe FilePath,
-    disableWeb :: Bool,
    scripted :: Bool
  }
  deriving (Show)
@@ -525,6 +284,7 @@ cliCommandP cfgPath logPath iniFile =
          ( long "fqdn"
              <> short 'n'
              <> help "Server FQDN used as Common Name for TLS online certificate"
+              <> showDefault
              <> metavar "FQDN"
          )
      password <-
@@ -537,41 +297,13 @@ cliCommandP cfgPath logPath iniFile =
                  <> help "Set password to create new messaging queues"
                  <> value SPRandom
              )
-      sourceCode <-
-        (optional . strOption)
-          ( long "source-code"
-              <> help "Server source code will be communicated to the users"
-              <> metavar "URI"
-          )
-      webStaticPath <-
-        (optional . strOption)
-          ( long "web-path"
-              <> help "Directory to store generated static site with server information"
-              <> metavar "PATH"
-          )
-      disableWeb <-
-        switch
-          ( long "disable-web"
-              <> help "Disable starting static web server with server information"
-          )
      scripted <-
        switch
          ( long "yes"
              <> short 'y'
              <> help "Non-interactive initialization using command-line options"
          )
-      pure
-        InitOptions
-          { enableStoreLog,
-            logStats,
-            signAlgorithm,
-            ip,
-            fqdn,
-            password,
-            sourceCode,
-            webStaticPath,
-            disableWeb,
-            scripted
-          }
+      pure InitOptions {enableStoreLog, logStats, signAlgorithm, ip, fqdn, password, scripted}
    parseBasicAuth :: ReadM ServerPassword
    parseBasicAuth = eitherReader $ fmap ServerPassword . strDecode . B.pack
+
@@ -8,6 +8,9 @@ module Simplex.Messaging.Server.QueueStore where
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Protocol

+-- normalized/storage form
+-- can be split into per-party pieces
+-- id/public key form party index, dhsecrets can use dense storage or loaded on demand
 data QueueRec = QueueRec
  { recipientId :: !RecipientId,
    recipientKey :: !RcvPublicAuthKey,
@@ -1,55 +0,0 @@
-{-# LANGUAGE TemplateHaskell #-}
-
-module Simplex.Messaging.Server.QueueStore.QueueInfo where
-
-import qualified Data.Aeson as J
-import qualified Data.Aeson.TH as JQ
-import qualified Data.Attoparsec.ByteString.Char8 as A
-import qualified Data.ByteString.Lazy.Char8 as LB
-import Data.Text (Text)
-import Data.Time.Clock (UTCTime)
-import Simplex.Messaging.Encoding
-import Simplex.Messaging.Parsers (defaultJSON, dropPrefix, enumJSON)
-import Simplex.Messaging.Util ((<$?>))
-
-data QueueInfo = QueueInfo
-  { qiSnd :: Bool,
-    qiNtf :: Bool,
-    qiSub :: Maybe QSub,
-    qiSize :: Int,
-    qiMsg :: Maybe MsgInfo
-  }
-  deriving (Eq, Show)
-
-data QSub = QSub
-  { qSubThread :: QSubThread,
-    qDelivered :: Maybe Text
-  }
-  deriving (Eq, Show)
-
-data QSubThread = QNoSub | QSubPending | QSubThread | QProhibitSub
-  deriving (Eq, Show)
-
-data MsgInfo = MsgInfo
-  { msgId :: Text,
-    msgTs :: UTCTime,
-    msgType :: MsgType
-  }
-  deriving (Eq, Show)
-
-data MsgType = MTMessage | MTQuota
-  deriving (Eq, Show)
-
-$(JQ.deriveJSON (enumJSON $ dropPrefix "Q") ''QSubThread)
-
-$(JQ.deriveJSON defaultJSON ''QSub)
-
-$(JQ.deriveJSON (enumJSON $ dropPrefix "MT") ''MsgType)
-
-$(JQ.deriveJSON defaultJSON ''MsgInfo)
-
-$(JQ.deriveJSON defaultJSON ''QueueInfo)
-
-instance Encoding QueueInfo where
-  smpEncode = LB.toStrict . J.encode
-  smpP = J.eitherDecodeStrict <$?> A.takeByteString
@@ -24,6 +24,8 @@ where

 import Control.Monad
 import Data.Functor (($>))
+import Data.HashMap.Strict (HashMap)
+import qualified Data.HashMap.Strict as HM
 import Simplex.Messaging.Protocol
 import Simplex.Messaging.Server.QueueStore
 import Simplex.Messaging.TMap (TMap)
@@ -32,29 +34,37 @@ import Simplex.Messaging.Util (ifM, ($>>=))
 import UnliftIO.STM

 data QueueStore = QueueStore
-  { queues :: TMap RecipientId (TVar QueueRec),
-    senders :: TMap SenderId RecipientId,
-    notifiers :: TMap NotifierId RecipientId
+  { recipientKeys :: TVar (HashMap RecipientId RcvPublicAuthKey), -- O(1) index for const-time auth checks
+    senderKeys :: TVar (HashMap SenderId SndPublicAuthKey), -- O(1) index for const-time auth checks
+    notifierKeys :: TVar (HashMap NotifierId NtfPublicAuthKey), -- O(1) index for const-time auth checks
+    queues :: TMap RecipientId (TVar QueueRec), -- can be stored cold; and indexed with ints (using annotated keys below)
+    senders :: TMap SenderId RecipientId, -- not needed with annotated keys
+    notifiers :: TMap NotifierId RecipientId -- not needed with annotated keys
  }

 newQueueStore :: STM QueueStore
 newQueueStore = do
+  recipientKeys <- newTVar mempty
+  senderKeys <- newTVar mempty
+  notifierKeys <- newTVar mempty
  queues <- TM.empty
  senders <- TM.empty
  notifiers <- TM.empty
-  pure QueueStore {queues, senders, notifiers}
+  pure QueueStore {recipientKeys, senderKeys, notifierKeys, queues, senders, notifiers}

 addQueue :: QueueStore -> QueueRec -> STM (Either ErrorType ())
-addQueue QueueStore {queues, senders} q@QueueRec {recipientId = rId, senderId = sId} = do
+addQueue QueueStore {recipientKeys, senderKeys, queues, senders} q@QueueRec {recipientId = rId, recipientKey, senderId = sId, senderKey} = do
  ifM hasId (pure $ Left DUPLICATE_) $ do
    qVar <- newTVar q
    TM.insert rId qVar queues
+    modifyTVar' recipientKeys $ HM.insert rId recipientKey
    TM.insert sId rId senders
+    forM_ senderKey $ modifyTVar' senderKeys . HM.insert rId -- XXX: should not exist here yet, unless testing?
    pure $ Right ()
  where
    hasId = (||) <$> TM.member rId queues <*> TM.member sId senders

-getQueue :: DirectParty p => QueueStore -> SParty p -> QueueId -> STM (Either ErrorType QueueRec)
+getQueue :: QueueStore -> SParty p -> QueueId -> STM (Either ErrorType QueueRec)
 getQueue QueueStore {queues, senders, notifiers} party qId =
  toResult <$> (mapM readTVar =<< getVar)
  where
@@ -64,13 +74,14 @@ getQueue QueueStore {queues, senders, notifiers} party qId =
      SNotifier -> TM.lookup qId notifiers $>>= (`TM.lookup` queues)

 secureQueue :: QueueStore -> RecipientId -> SndPublicAuthKey -> STM (Either ErrorType QueueRec)
-secureQueue QueueStore {queues} rId sKey =
+secureQueue QueueStore {senderKeys, 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
-      _ ->
+      _ -> do
        let q' = q {senderKey = Just sKey}
-         in writeTVar qVar q' $> Just q'
+        modifyTVar' senderKeys $ HM.insert rId sKey
+        writeTVar qVar q' $> Just q'

 addQueueNotifier :: QueueStore -> RecipientId -> NtfCreds -> STM (Either ErrorType QueueRec)
 addQueueNotifier QueueStore {queues, notifiers} rId ntfCreds@NtfCreds {notifierId = nId} = do
@@ -1,5 +1,3 @@
-{-# LANGUAGE DeriveFunctor #-}
-{-# LANGUAGE DeriveTraversable #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
@@ -12,14 +10,8 @@ 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.Foldable (toList)
-import Data.IntMap (IntMap)
-import qualified Data.IntMap.Strict as IM
-import Data.List (find)
-import Data.Maybe (listToMaybe)
 import Data.Set (Set)
 import qualified Data.Set as S
-import Data.String (IsString)
 import Data.Time.Calendar.Month (pattern MonthDay)
 import Data.Time.Calendar.OrdinalDate (mondayStartWeek)
 import Data.Time.Clock (UTCTime (..))
@@ -34,25 +26,13 @@ data ServerStats = ServerStats
    qDeletedAll :: TVar Int,
    qDeletedNew :: TVar Int,
    qDeletedSecured :: TVar Int,
-    qSub :: TVar Int,
-    qSubAuth :: TVar Int,
-    qSubDuplicate :: TVar Int,
-    qSubProhibited :: TVar Int,
    msgSent :: TVar Int,
-    msgSentAuth :: TVar Int,
-    msgSentQuota :: TVar Int,
-    msgSentLarge :: TVar Int,
    msgRecv :: TVar Int,
    msgExpired :: TVar Int,
    activeQueues :: PeriodStats RecipientId,
    msgSentNtf :: TVar Int,
    msgRecvNtf :: TVar Int,
    activeQueuesNtf :: PeriodStats RecipientId,
-    pRelays :: ProxyStats,
-    pRelaysOwn :: ProxyStats,
-    pMsgFwds :: ProxyStats,
-    pMsgFwdsOwn :: ProxyStats,
-    pMsgFwdsRecv :: TVar Int,
    qCount :: TVar Int,
    msgCount :: TVar Int
  }
@@ -64,25 +44,13 @@ data ServerStatsData = ServerStatsData
    _qDeletedAll :: Int,
    _qDeletedNew :: Int,
    _qDeletedSecured :: Int,
-    _qSub :: Int,
-    _qSubAuth :: Int,
-    _qSubDuplicate :: Int,
-    _qSubProhibited :: Int,
    _msgSent :: Int,
-    _msgSentAuth :: Int,
-    _msgSentQuota :: Int,
-    _msgSentLarge :: Int,
    _msgRecv :: Int,
    _msgExpired :: Int,
    _activeQueues :: PeriodStatsData RecipientId,
    _msgSentNtf :: Int,
    _msgRecvNtf :: Int,
    _activeQueuesNtf :: PeriodStatsData RecipientId,
-    _pRelays :: ProxyStatsData,
-    _pRelaysOwn :: ProxyStatsData,
-    _pMsgFwds :: ProxyStatsData,
-    _pMsgFwdsOwn :: ProxyStatsData,
-    _pMsgFwdsRecv :: Int,
    _qCount :: Int,
    _msgCount :: Int
  }
@@ -96,28 +64,16 @@ newServerStats ts = do
  qDeletedAll <- newTVar 0
  qDeletedNew <- newTVar 0
  qDeletedSecured <- newTVar 0
-  qSub <- newTVar 0
-  qSubAuth <- newTVar 0
-  qSubDuplicate <- newTVar 0
-  qSubProhibited <- newTVar 0
  msgSent <- newTVar 0
-  msgSentAuth <- newTVar 0
-  msgSentQuota <- newTVar 0
-  msgSentLarge <- newTVar 0
  msgRecv <- newTVar 0
  msgExpired <- newTVar 0
  activeQueues <- newPeriodStats
  msgSentNtf <- newTVar 0
  msgRecvNtf <- newTVar 0
  activeQueuesNtf <- newPeriodStats
-  pRelays <- newProxyStats
-  pRelaysOwn <- newProxyStats
-  pMsgFwds <- newProxyStats
-  pMsgFwdsOwn <- newProxyStats
-  pMsgFwdsRecv <- newTVar 0
  qCount <- newTVar 0
  msgCount <- newTVar 0
-  pure ServerStats {fromTime, qCreated, qSecured, qDeletedAll, qDeletedNew, qDeletedSecured, qSub, qSubAuth, qSubDuplicate, qSubProhibited, msgSent, msgSentAuth, msgSentQuota, msgSentLarge, msgRecv, msgExpired, activeQueues, msgSentNtf, msgRecvNtf, activeQueuesNtf, pRelays, pRelaysOwn, pMsgFwds, pMsgFwdsOwn, pMsgFwdsRecv, qCount, msgCount}
+  pure ServerStats {fromTime, qCreated, qSecured, qDeletedAll, qDeletedNew, qDeletedSecured, msgSent, msgRecv, msgExpired, activeQueues, msgSentNtf, msgRecvNtf, activeQueuesNtf, qCount, msgCount}

 getServerStatsData :: ServerStats -> STM ServerStatsData
 getServerStatsData s = do
@@ -127,28 +83,16 @@ getServerStatsData s = do
  _qDeletedAll <- readTVar $ qDeletedAll s
  _qDeletedNew <- readTVar $ qDeletedNew s
  _qDeletedSecured <- readTVar $ qDeletedSecured s
-  _qSub <- readTVar $ qSub s
-  _qSubAuth <- readTVar $ qSubAuth s
-  _qSubDuplicate <- readTVar $ qSubDuplicate s
-  _qSubProhibited <- readTVar $ qSubProhibited s
  _msgSent <- readTVar $ msgSent s
-  _msgSentAuth <- readTVar $ msgSentAuth s
-  _msgSentQuota <- readTVar $ msgSentQuota s
-  _msgSentLarge <- readTVar $ msgSentLarge s
  _msgRecv <- readTVar $ msgRecv s
  _msgExpired <- readTVar $ msgExpired s
  _activeQueues <- getPeriodStatsData $ activeQueues s
  _msgSentNtf <- readTVar $ msgSentNtf s
  _msgRecvNtf <- readTVar $ msgRecvNtf s
  _activeQueuesNtf <- getPeriodStatsData $ activeQueuesNtf s
-  _pRelays <- getProxyStatsData $ pRelays s
-  _pRelaysOwn <- getProxyStatsData $ pRelaysOwn s
-  _pMsgFwds <- getProxyStatsData $ pMsgFwds s
-  _pMsgFwdsOwn <- getProxyStatsData $ pMsgFwdsOwn s
-  _pMsgFwdsRecv <- readTVar $ pMsgFwdsRecv s
  _qCount <- readTVar $ qCount s
  _msgCount <- readTVar $ msgCount s
-  pure ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeletedAll, _qDeletedNew, _qDeletedSecured, _qSub, _qSubAuth, _qSubDuplicate, _qSubProhibited, _msgSent, _msgSentAuth, _msgSentQuota, _msgSentLarge, _msgRecv, _msgExpired, _activeQueues, _msgSentNtf, _msgRecvNtf, _activeQueuesNtf, _pRelays, _pRelaysOwn, _pMsgFwds, _pMsgFwdsOwn, _pMsgFwdsRecv, _qCount, _msgCount}
+  pure ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeletedAll, _qDeletedNew, _qDeletedSecured, _msgSent, _msgRecv, _msgExpired, _activeQueues, _msgSentNtf, _msgRecvNtf, _activeQueuesNtf, _qCount, _msgCount}

 setServerStats :: ServerStats -> ServerStatsData -> STM ()
 setServerStats s d = do
@@ -158,63 +102,35 @@ setServerStats s d = do
  writeTVar (qDeletedAll s) $! _qDeletedAll d
  writeTVar (qDeletedNew s) $! _qDeletedNew d
  writeTVar (qDeletedSecured s) $! _qDeletedSecured d
-  writeTVar (qSub s) $! _qSub d
-  writeTVar (qSubAuth s) $! _qSubAuth d
-  writeTVar (qSubDuplicate s) $! _qSubDuplicate d
-  writeTVar (qSubProhibited s) $! _qSubProhibited d
  writeTVar (msgSent s) $! _msgSent d
-  writeTVar (msgSentAuth s) $! _msgSentAuth d
-  writeTVar (msgSentQuota s) $! _msgSentQuota d
-  writeTVar (msgSentLarge s) $! _msgSentLarge d
  writeTVar (msgRecv s) $! _msgRecv d
  writeTVar (msgExpired s) $! _msgExpired d
  setPeriodStats (activeQueues s) (_activeQueues d)
  writeTVar (msgSentNtf s) $! _msgSentNtf d
  writeTVar (msgRecvNtf s) $! _msgRecvNtf d
  setPeriodStats (activeQueuesNtf s) (_activeQueuesNtf d)
-  setProxyStats (pRelays s) $! _pRelays d
-  setProxyStats (pRelaysOwn s) $! _pRelaysOwn d
-  setProxyStats (pMsgFwds s) $! _pMsgFwds d
-  setProxyStats (pMsgFwdsOwn s) $! _pMsgFwdsOwn d
-  writeTVar (pMsgFwdsRecv s) $! _pMsgFwdsRecv d
  writeTVar (qCount s) $! _qCount d
  writeTVar (msgCount s) $! _msgCount d

 instance StrEncoding ServerStatsData where
-  strEncode d =
+  strEncode ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeletedAll, _qDeletedNew, _qDeletedSecured, _msgSent, _msgRecv, _msgExpired, _msgSentNtf, _msgRecvNtf, _activeQueues, _activeQueuesNtf, _qCount, _msgCount} =
    B.unlines
-      [ "fromTime=" <> strEncode (_fromTime d),
-        "qCreated=" <> strEncode (_qCreated d),
-        "qSecured=" <> strEncode (_qSecured d),
-        "qDeletedAll=" <> strEncode (_qDeletedAll d),
-        "qDeletedNew=" <> strEncode (_qDeletedNew d),
-        "qDeletedSecured=" <> strEncode (_qDeletedSecured d),
-        "qCount=" <> strEncode (_qCount d),
-        "qSub=" <> strEncode (_qSub d),
-        "qSubAuth=" <> strEncode (_qSubAuth d),
-        "qSubDuplicate=" <> strEncode (_qSubDuplicate d),
-        "qSubProhibited=" <> strEncode (_qSubProhibited d),
-        "msgSent=" <> strEncode (_msgSent d),
-        "msgSentAuth=" <> strEncode (_msgSentAuth d),
-        "msgSentQuota=" <> strEncode (_msgSentQuota d),
-        "msgSentLarge=" <> strEncode (_msgSentLarge d),
-        "msgRecv=" <> strEncode (_msgRecv d),
-        "msgExpired=" <> strEncode (_msgExpired d),
-        "msgSentNtf=" <> strEncode (_msgSentNtf d),
-        "msgRecvNtf=" <> strEncode (_msgRecvNtf d),
+      [ "fromTime=" <> strEncode _fromTime,
+        "qCreated=" <> strEncode _qCreated,
+        "qSecured=" <> strEncode _qSecured,
+        "qDeletedAll=" <> strEncode _qDeletedAll,
+        "qDeletedNew=" <> strEncode _qDeletedNew,
+        "qDeletedSecured=" <> strEncode _qDeletedSecured,
+        "qCount=" <> strEncode _qCount,
+        "msgSent=" <> strEncode _msgSent,
+        "msgRecv=" <> strEncode _msgRecv,
+        "msgExpired=" <> strEncode _msgExpired,
+        "msgSentNtf=" <> strEncode _msgSentNtf,
+        "msgRecvNtf=" <> strEncode _msgRecvNtf,
        "activeQueues:",
-        strEncode (_activeQueues d),
+        strEncode _activeQueues,
        "activeQueuesNtf:",
-        strEncode (_activeQueuesNtf d),
-        "pRelays:",
-        strEncode (_pRelays d),
-        "pRelaysOwn:",
-        strEncode (_pRelaysOwn d),
-        "pMsgFwds:",
-        strEncode (_pMsgFwds d),
-        "pMsgFwdsOwn:",
-        strEncode (_pMsgFwdsOwn d),
-        "pMsgFwdsRecv=" <> strEncode (_pMsgFwdsRecv d)
+        strEncode _activeQueuesNtf
      ]
  strP = do
    _fromTime <- "fromTime=" *> strP <* A.endOfLine
@@ -223,19 +139,12 @@ instance StrEncoding ServerStatsData where
    (_qDeletedAll, _qDeletedNew, _qDeletedSecured) <-
      (,0,0) <$> ("qDeleted=" *> strP <* A.endOfLine)
        <|> ((,,) <$> ("qDeletedAll=" *> strP <* A.endOfLine) <*> ("qDeletedNew=" *> strP <* A.endOfLine) <*> ("qDeletedSecured=" *> strP <* A.endOfLine))
-    _qCount <- opt "qCount="
-    _qSub <- opt "qSub="
-    _qSubAuth <- opt "qSubAuth="
-    _qSubDuplicate <- opt "qSubDuplicate="
-    _qSubProhibited <- opt "qSubProhibited="
+    _qCount <- "qCount=" *> strP <* A.endOfLine <|> pure 0
    _msgSent <- "msgSent=" *> strP <* A.endOfLine
-    _msgSentAuth <- opt "msgSentAuth="
-    _msgSentQuota <- opt "msgSentQuota="
-    _msgSentLarge <- opt "msgSentLarge="
    _msgRecv <- "msgRecv=" *> strP <* A.endOfLine
-    _msgExpired <- opt "msgExpired="
-    _msgSentNtf <- opt "msgSentNtf="
-    _msgRecvNtf <- opt "msgRecvNtf="
+    _msgExpired <- "msgExpired=" *> strP <* A.endOfLine <|> pure 0
+    _msgSentNtf <- "msgSentNtf=" *> strP <* A.endOfLine <|> pure 0
+    _msgRecvNtf <- "msgRecvNtf=" *> strP <* A.endOfLine <|> pure 0
    _activeQueues <-
      optional ("activeQueues:" <* A.endOfLine) >>= \case
        Just _ -> strP <* optional A.endOfLine
@@ -248,18 +157,7 @@ instance StrEncoding ServerStatsData where
      optional ("activeQueuesNtf:" <* A.endOfLine) >>= \case
        Just _ -> strP <* optional A.endOfLine
        _ -> pure newPeriodStatsData
-    _pRelays <- proxyStatsP "pRelays:"
-    _pRelaysOwn <- proxyStatsP "pRelaysOwn:"
-    _pMsgFwds <- proxyStatsP "pMsgFwds:"
-    _pMsgFwdsOwn <- proxyStatsP "pMsgFwdsOwn:"
-    _pMsgFwdsRecv <- opt "pMsgFwdsRecv="
-    pure ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeletedAll, _qDeletedNew, _qDeletedSecured, _qSub, _qSubAuth, _qSubDuplicate, _qSubProhibited, _msgSent, _msgSentAuth, _msgSentQuota, _msgSentLarge, _msgRecv, _msgExpired, _msgSentNtf, _msgRecvNtf, _activeQueues, _activeQueuesNtf, _pRelays, _pRelaysOwn, _pMsgFwds, _pMsgFwdsOwn, _pMsgFwdsRecv, _qCount, _msgCount = 0}
-    where
-      opt s = A.string s *> strP <* A.endOfLine <|> pure 0
-      proxyStatsP key =
-        optional (A.string key >> A.endOfLine) >>= \case
-          Just _ -> strP <* optional A.endOfLine
-          _ -> pure newProxyStatsData
+    pure ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeletedAll, _qDeletedNew, _qDeletedSecured, _msgSent, _msgRecv, _msgExpired, _msgSentNtf, _msgRecvNtf, _activeQueues, _activeQueuesNtf, _qCount, _msgCount = 0}

 data PeriodStats a = PeriodStats
  { day :: TVar (Set a),
@@ -333,136 +231,3 @@ updatePeriodStats stats pId = do
  updatePeriod month
  where
    updatePeriod pSel = modifyTVar' (pSel stats) (S.insert pId)
-
-data ProxyStats = ProxyStats
-  { pRequests :: TVar Int,
-    pSuccesses :: TVar Int, -- includes destination server error responses that will be forwarded to the client
-    pErrorsConnect :: TVar Int,
-    pErrorsCompat :: TVar Int,
-    pErrorsOther :: TVar Int
-  }
-
-newProxyStats :: STM ProxyStats
-newProxyStats = do
-  pRequests <- newTVar 0
-  pSuccesses <- newTVar 0
-  pErrorsConnect <- newTVar 0
-  pErrorsCompat <- newTVar 0
-  pErrorsOther <- newTVar 0
-  pure ProxyStats {pRequests, pSuccesses, pErrorsConnect, pErrorsCompat, pErrorsOther}
-
-data ProxyStatsData = ProxyStatsData
-  { _pRequests :: Int,
-    _pSuccesses :: Int,
-    _pErrorsConnect :: Int,
-    _pErrorsCompat :: Int,
-    _pErrorsOther :: Int
-  }
-  deriving (Show)
-
-newProxyStatsData :: ProxyStatsData
-newProxyStatsData = ProxyStatsData {_pRequests = 0, _pSuccesses = 0, _pErrorsConnect = 0, _pErrorsCompat = 0, _pErrorsOther = 0}
-
-getProxyStatsData :: ProxyStats -> STM ProxyStatsData
-getProxyStatsData s = do
-  _pRequests <- readTVar $ pRequests s
-  _pSuccesses <- readTVar $ pSuccesses s
-  _pErrorsConnect <- readTVar $ pErrorsConnect s
-  _pErrorsCompat <- readTVar $ pErrorsCompat s
-  _pErrorsOther <- readTVar $ pErrorsOther s
-  pure ProxyStatsData {_pRequests, _pSuccesses, _pErrorsConnect, _pErrorsCompat, _pErrorsOther}
-
-getResetProxyStatsData :: ProxyStats -> STM ProxyStatsData
-getResetProxyStatsData s = do
-  _pRequests <- swapTVar (pRequests s) 0
-  _pSuccesses <- swapTVar (pSuccesses s) 0
-  _pErrorsConnect <- swapTVar (pErrorsConnect s) 0
-  _pErrorsCompat <- swapTVar (pErrorsCompat s) 0
-  _pErrorsOther <- swapTVar (pErrorsOther s) 0
-  pure ProxyStatsData {_pRequests, _pSuccesses, _pErrorsConnect, _pErrorsCompat, _pErrorsOther}
-
-setProxyStats :: ProxyStats -> ProxyStatsData -> STM ()
-setProxyStats s d = do
-  writeTVar (pRequests s) $! _pRequests d
-  writeTVar (pSuccesses s) $! _pSuccesses d
-  writeTVar (pErrorsConnect s) $! _pErrorsConnect d
-  writeTVar (pErrorsCompat s) $! _pErrorsCompat d
-  writeTVar (pErrorsOther s) $! _pErrorsOther d
-
-instance StrEncoding ProxyStatsData where
-  strEncode ProxyStatsData {_pRequests, _pSuccesses, _pErrorsConnect, _pErrorsCompat, _pErrorsOther} =
-    "requests="
-      <> strEncode _pRequests
-      <> "\nsuccesses="
-      <> strEncode _pSuccesses
-      <> "\nerrorsConnect="
-      <> strEncode _pErrorsConnect
-      <> "\nerrorsCompat="
-      <> strEncode _pErrorsCompat
-      <> "\nerrorsOther="
-      <> strEncode _pErrorsOther
-  strP = do
-    _pRequests <- "requests=" *> strP <* A.endOfLine
-    _pSuccesses <- "successes=" *> strP <* A.endOfLine
-    _pErrorsConnect <- "errorsConnect=" *> strP <* A.endOfLine
-    _pErrorsCompat <- "errorsCompat=" *> strP <* A.endOfLine
-    _pErrorsOther <- "errorsOther=" *> strP
-    pure ProxyStatsData {_pRequests, _pSuccesses, _pErrorsConnect, _pErrorsCompat, _pErrorsOther}
-
-- counter -> occurences
-newtype Histogram = Histogram (IntMap Int)
-  deriving (Show)
-
-histogram :: Foldable t => t Int -> Histogram
-histogram = Histogram . IM.fromListWith (+) . map (,1) . toList
-{-# INLINE histogram #-}
-
-distribution :: Histogram -> Distribution Int
-distribution h =
-  Distribution
-    { minimal = maybe 0 fst $ listToMaybe cdf',
-      bottom50p = bot 0.5, -- std median
-      top50p = top 0.5,
-      top20p = top 0.2,
-      top10p = top 0.1,
-      top5p = top 0.05,
-      top1p = top 0.01,
-      maximal = maybe 0 fst $ listToMaybe rcdf'
-    }
-  where
-    bot p = maybe 0 fst $ find (\(_, p') -> p' >= p) cdf'
-    top p = maybe 0 fst $ find (\(_, p') -> p' <= 1 - p) rcdf'
-    cdf' = cdf h
-    rcdf' = reverse cdf' -- allow find to work from the smaller end
-
-cdf :: Histogram -> [(Int, Float)]
-cdf (Histogram h) = map (\(v, cc) -> (v, fromIntegral cc / total)) . scanl1 cumulative $ IM.assocs h
-  where
-    total :: Float
-    total = fromIntegral $ sum h
-    cumulative (_, acc) (v, c) = (v, acc + c)
-
-data Distribution a = Distribution
-  { minimal :: a,
-    bottom50p :: a,
-    top50p :: a,
-    top20p :: a,
-    top10p :: a,
-    top5p :: a,
-    top1p :: a,
-    maximal :: a
-  }
-  deriving (Show, Functor, Foldable, Traversable)
-
-distributionLabels :: IsString a => Distribution a
-distributionLabels =
-  Distribution
-    { minimal = "minimal",
-      bottom50p = "bottom50p",
-      top50p = "top50p",
-      top20p = "top20p",
-      top10p = "top10p",
-      top5p = "top5p",
-      top1p = "top1p",
-      maximal = "maximal"
-    }
@@ -1,195 +0,0 @@
-{-# LANGUAGE DeriveFunctor #-}
-{-# LANGUAGE DeriveTraversable #-}
-{-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE NamedFieldPuns #-}
-{-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE PatternSynonyms #-}
-{-# LANGUAGE RankNTypes #-}
-{-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE TupleSections #-}
-
-module Simplex.Messaging.Server.Stats.Client where
-
-import Data.IntSet (IntSet)
-import qualified Data.IntSet as IS
-import Data.Set (Set)
-import Data.String (IsString)
-import Data.Time.Clock (UTCTime (..))
-import Simplex.Messaging.Protocol (RecipientId)
-import Simplex.Messaging.Transport (PeerId)
-import UnliftIO.STM
-
-- | Ephemeral client ID across reconnects
-type ClientStatsId = Int
-
-data ClientStats = ClientStats
-  { peerAddresses :: TVar IntSet, -- cumulative set of used PeerIds
-    socketCount :: TVar Int,
-    createdAt :: TVar UTCTime,
-    updatedAt :: TVar UTCTime,
-    qCreated :: TVar (Set RecipientId), -- can be IntSet with QueueRecIDs, for dumping into suspicous
-    qSentSigned :: TVar (Set RecipientId), -- can be IntSet with QueueRecIDs
-    msgSentSigned :: TVar Int,
-    msgSentUnsigned :: TVar Int,
-    msgDeliveredSigned :: TVar Int,
-    proxyRelaysRequested :: TVar Int,
-    proxyRelaysConnected :: TVar Int,
-    msgSentViaProxy :: TVar Int
-  }
-
-- may be combined with session duration to produce average rates (q/s, msg/s)
-data ClientStatsData = ClientStatsData
-  { _peerAddresses :: IntSet,
-    _socketCount :: Int,
-    _createdAt :: UTCTime,
-    _updatedAt :: UTCTime,
-    _qCreated :: Set RecipientId,
-    _qSentSigned :: Set RecipientId,
-    _msgSentSigned :: Int,
-    _msgSentUnsigned :: Int,
-    _msgDeliveredSigned :: Int,
-    _proxyRelaysRequested :: Int,
-    _proxyRelaysConnected :: Int,
-    _msgSentViaProxy :: Int
-  }
-
-newClientStats :: Monad m => (forall a. a -> m (TVar a)) -> PeerId -> UTCTime -> m ClientStats
-newClientStats newF peerId ts = do
-  peerAddresses <- newF $ IS.singleton peerId
-  socketCount <- newF 1
-  createdAt <- newF ts
-  updatedAt <- newF ts
-  qCreated <- newF mempty
-  qSentSigned <- newF mempty
-  msgSentSigned <- newF 0
-  msgSentUnsigned <- newF 0
-  msgDeliveredSigned <- newF 0
-  proxyRelaysRequested <- newF 0
-  proxyRelaysConnected <- newF 0
-  msgSentViaProxy <- newF 0
-  pure
-    ClientStats
-      { peerAddresses,
-        socketCount,
-        createdAt,
-        updatedAt,
-        qCreated,
-        qSentSigned,
-        msgSentSigned,
-        msgSentUnsigned,
-        msgDeliveredSigned,
-        proxyRelaysRequested,
-        proxyRelaysConnected,
-        msgSentViaProxy
-      }
-{-# INLINE newClientStats #-}
-
-readClientStatsData :: Monad m => (forall a. TVar a -> m a) -> ClientStats -> m ClientStatsData
-readClientStatsData readF cs = do
-  _peerAddresses <- readF $ peerAddresses cs
-  _socketCount <- readF $ socketCount cs
-  _createdAt <- readF $ createdAt cs
-  _updatedAt <- readF $ updatedAt cs
-  _qCreated <- readF $ qCreated cs
-  _qSentSigned <- readF $ qSentSigned cs
-  _msgSentSigned <- readF $ msgSentSigned cs
-  _msgSentUnsigned <- readF $ msgSentUnsigned cs
-  _msgDeliveredSigned <- readF $ msgDeliveredSigned cs
-  _proxyRelaysRequested <- readF $ proxyRelaysRequested cs
-  _proxyRelaysConnected <- readF $ proxyRelaysConnected cs
-  _msgSentViaProxy <- readF $ msgSentViaProxy cs
-  pure
-    ClientStatsData
-      { _peerAddresses,
-        _socketCount,
-        _createdAt,
-        _updatedAt,
-        _qCreated,
-        _qSentSigned,
-        _msgSentSigned,
-        _msgSentUnsigned,
-        _msgDeliveredSigned,
-        _proxyRelaysRequested,
-        _proxyRelaysConnected,
-        _msgSentViaProxy
-      }
-{-# INLINE readClientStatsData #-}
-
-writeClientStatsData :: ClientStats -> ClientStatsData -> STM ()
-writeClientStatsData cs csd = do
-  writeTVar (peerAddresses cs) (_peerAddresses csd)
-  writeTVar (socketCount cs) (_socketCount csd)
-  writeTVar (createdAt cs) (_createdAt csd)
-  writeTVar (updatedAt cs) (_updatedAt csd)
-  writeTVar (qCreated cs) (_qCreated csd)
-  writeTVar (qSentSigned cs) (_qSentSigned csd)
-  writeTVar (msgSentSigned cs) (_msgSentSigned csd)
-  writeTVar (msgSentUnsigned cs) (_msgSentUnsigned csd)
-  writeTVar (msgDeliveredSigned cs) (_msgDeliveredSigned csd)
-  writeTVar (proxyRelaysRequested cs) (_proxyRelaysRequested csd)
-  writeTVar (proxyRelaysConnected cs) (_proxyRelaysConnected csd)
-  writeTVar (msgSentViaProxy cs) (_msgSentViaProxy csd)
-
-mergeClientStatsData :: ClientStatsData -> ClientStatsData -> ClientStatsData
-mergeClientStatsData a b =
-  ClientStatsData
-    { _peerAddresses = _peerAddresses a <> _peerAddresses b,
-      _socketCount = _socketCount a + _socketCount b,
-      _createdAt = min (_createdAt a) (_createdAt b),
-      _updatedAt = max (_updatedAt a) (_updatedAt b),
-      _qCreated = _qCreated a <> _qCreated b,
-      _qSentSigned = _qSentSigned a <> _qSentSigned b,
-      _msgSentSigned = _msgSentSigned a + _msgSentSigned b,
-      _msgSentUnsigned = _msgSentUnsigned a + _msgSentUnsigned b,
-      _msgDeliveredSigned = _msgDeliveredSigned a + _msgDeliveredSigned b,
-      _proxyRelaysRequested = _proxyRelaysRequested a + _proxyRelaysRequested b,
-      _proxyRelaysConnected = _proxyRelaysConnected a + _proxyRelaysConnected b,
-      _msgSentViaProxy = _msgSentViaProxy a + _msgSentViaProxy b
-    }
-
-- | A column-based collection of ClientStats-related data.
-data ClientStatsC a = ClientStatsC
-  { peerAddressesC :: a,
-    socketCountC :: a,
-    qCreatedC :: a,
-    qSentSignedC :: a,
-    msgSentSignedC :: a,
-    msgSentUnsignedC :: a,
-    msgDeliveredSignedC :: a,
-    proxyRelaysRequestedC :: a,
-    proxyRelaysConnectedC :: a,
-    msgSentViaProxyC :: a
-  }
-  deriving (Show, Functor, Foldable, Traversable)
-
-clientStatsC :: a -> ClientStatsC a
-clientStatsC x =
-  ClientStatsC
-    { peerAddressesC = x,
-      socketCountC = x,
-      qCreatedC = x,
-      qSentSignedC = x,
-      msgSentSignedC = x,
-      msgSentUnsignedC = x,
-      msgDeliveredSignedC = x,
-      proxyRelaysRequestedC = x,
-      proxyRelaysConnectedC = x,
-      msgSentViaProxyC = x
-    }
-{-# INLINE clientStatsC #-}
-
-clientStatsLabels :: IsString a => ClientStatsC a
-clientStatsLabels =
-  ClientStatsC
-    { peerAddressesC = "peerAddresses",
-      socketCountC = "socketCount",
-      qCreatedC = "qCreated",
-      qSentSignedC = "qSentSigned",
-      msgSentSignedC = "msgSentSigned",
-      msgSentUnsignedC = "msgSentUnsigned",
-      msgDeliveredSignedC = "msgDeliveredSigned",
-      proxyRelaysRequestedC = "proxyRelaysRequested",
-      proxyRelaysConnectedC = "proxyRelaysConnected",
-      msgSentViaProxyC = "msgSentViaProxy"
-    }
-{-# INLINE clientStatsLabels #-}
@@ -1,60 +0,0 @@
-{-# LANGUAGE LambdaCase #-}
-{-# LANGUAGE NamedFieldPuns #-}
-{-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE PatternSynonyms #-}
-{-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE TupleSections #-}
-
-module Simplex.Messaging.Server.Stats.Timeline where
-
-import Data.IntMap (IntMap)
-import qualified Data.IntMap.Strict as IM
-import Data.IntPSQ (IntPSQ)
-import qualified Data.IntPSQ as IP
-import Data.List (find, sortOn)
-import Data.Maybe (listToMaybe)
-import Data.Time.Clock (NominalDiffTime)
-import Data.Time.Clock.POSIX (POSIXTime)
-import Data.Word (Word32)
-import UnliftIO.STM
-
-- A time series of counters with an active head
-type Timeline a = (TVar SparseSeries, Current a)
-
-newTimeline :: forall a. QuantFun -> POSIXTime -> STM (Timeline a)
-newTimeline quantF now = (,current) <$> newTVar IP.empty
-  where
-    current :: Current a
-    current = (quantF, quantF now, mempty)
-
-- Sparse timeseries with 1 second resolution (or more coarse):
--   priotity - time/bucket
--   key -- PeerId
--   value -- final counter value of the bucket that was current
-- May be combined with bucket width to produce rolling rates.
-type SparseSeries = IntPSQ BucketId Int
-
-- POSIXTime, or quantized
-type BucketId = Word32
-
-type QuantFun = POSIXTime -> BucketId
-
-- Current bucket that gets filled
-type Current a = (QuantFun, BucketId, IntMap (TVar a))
-
-perSecond :: POSIXTime -> BucketId
-perSecond = truncate
-
-perMinute :: POSIXTime -> BucketId
-perMinute = (60 `secondsWidth`)
-
-secondsWidth :: NominalDiffTime -> POSIXTime -> BucketId
-secondsWidth w t = truncate $ t / w
-
-finishCurrent :: POSIXTime -> Timeline a -> STM (Timeline a)
-finishCurrent now (series, current) = error "TODO: read/reset current, push into series, evict minimal when it falls out of scope"
-
-type WindowData = IntMap Int -- PeerId -> counter
-
-window :: BucketId -> BucketId -> SparseSeries -> WindowData
-window = error "TODO: pick elements inside the range and drop bucket ids"
@@ -8,25 +8,22 @@ import Control.Concurrent.STM
 import Control.Monad
 import Data.Composition ((.:.))
 import Data.Functor (($>))
-import Data.Time (UTCTime)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
-import Simplex.Messaging.Util (($>>=))

 data SessionVar a = SessionVar
  { sessionVar :: TMVar a,
-    sessionVarId :: Int,
-    sessionVarTs :: UTCTime
+    sessionVarId :: Int
  }

-getSessVar :: forall k a. Ord k => TVar Int -> k -> TMap k (SessionVar a) -> UTCTime -> STM (Either (SessionVar a) (SessionVar a))
-getSessVar sessSeq sessKey vs sessionVarTs = maybe (Left <$> newSessionVar) (pure . Right) =<< TM.lookup sessKey vs
+getSessVar :: forall k a. Ord k => TVar Int -> k -> TMap k (SessionVar a) -> STM (Either (SessionVar a) (SessionVar a))
+getSessVar sessSeq sessKey vs = maybe (Left <$> newSessionVar) (pure . Right) =<< TM.lookup sessKey vs
  where
    newSessionVar :: STM (SessionVar a)
    newSessionVar = do
      sessionVar <- newEmptyTMVar
      sessionVarId <- stateTVar sessSeq $ \next -> (next, next + 1)
-      let v = SessionVar {sessionVar, sessionVarId, sessionVarTs}
+      let v = SessionVar {sessionVar, sessionVarId}
      TM.insert sessKey v vs
      pure v

@@ -39,6 +36,3 @@ removeSessVar' v sessKey vs =
  TM.lookup sessKey vs >>= \case
    Just v' | sessionVarId v == sessionVarId v' -> TM.delete sessKey vs $> True
    _ -> pure False
-
-tryReadSessVar :: Ord k => k -> TMap k (SessionVar a) -> STM (Maybe a)
-tryReadSessVar sessKey vs = TM.lookup sessKey vs $>>= (tryReadTMVar . sessionVar)
@@ -36,7 +36,6 @@ module Simplex.Messaging.Transport
    supportedSMPHandshakes,
    supportedClientSMPRelayVRange,
    supportedServerSMPRelayVRange,
-    proxiedSMPRelayVRange,
    legacyServerSMPRelayVRange,
    currentClientSMPRelayVersion,
    legacyServerSMPRelayVersion,
@@ -45,7 +44,6 @@ module Simplex.Messaging.Transport
    basicAuthSMPVersion,
    subModeSMPVersion,
    authCmdsSMPVersion,
-    sendingProxySMPVersion,
    simplexMQVersion,
    smpBlockSize,
    TransportConfig (..),
@@ -56,9 +54,6 @@ module Simplex.Messaging.Transport
    ATransport (..),
    TransportPeer (..),
    getServerVerifyKey,
-    PeerId,
-    clientPeerId,
-    addrPeerId,

    -- * TLS Transport
    TLS (..),
@@ -79,13 +74,14 @@ module Simplex.Messaging.Transport
    smpClientHandshake,
    tPutBlock,
    tGetBlock,
+    serializeTransportError,
+    transportErrorP,
    sendHandshake,
    getHandshake,
-    smpTHParamsSetVersion,
  )
 where

-import Control.Applicative (optional)
+import Control.Applicative (optional, (<|>))
 import Control.Monad (forM)
 import Control.Monad.Except
 import Control.Monad.Trans.Except (throwE)
@@ -99,14 +95,12 @@ import qualified Data.ByteString.Char8 as B
 import qualified Data.ByteString.Lazy.Char8 as LB
 import Data.Default (def)
 import Data.Functor (($>))
-import Data.Hashable (hash)
 import Data.Version (showVersion)
 import Data.Word (Word16)
 import qualified Data.X509 as X
 import qualified Data.X509.Validation as XV
 import GHC.IO.Handle.Internals (ioe_EOF)
 import Network.Socket
-import qualified Network.Socket.Address as SA
 import qualified Network.TLS as T
 import qualified Network.TLS.Extra as TE
 import qualified Paths_simplexmq as SMQ
@@ -133,7 +127,7 @@ smpBlockSize = 16384
 -- 4 - support command batching (7/17/2022)
 -- 5 - basic auth for SMP servers (11/12/2022)
 -- 6 - allow creating queues without subscribing (9/10/2023)
-- 7 - support authenticated encryption to verify senders' commands, imply but do NOT send session ID in signed part (4/30/2024)
+-- 7 - support authenticated encryption to verify senders' commands, imply but do NOT send session ID in signed part (2/3/2024)

 data SMPVersion

@@ -158,25 +152,14 @@ subModeSMPVersion = VersionSMP 6
 authCmdsSMPVersion :: VersionSMP
 authCmdsSMPVersion = VersionSMP 7

-sendingProxySMPVersion :: VersionSMP
-sendingProxySMPVersion = VersionSMP 8
-
 currentClientSMPRelayVersion :: VersionSMP
-currentClientSMPRelayVersion = VersionSMP 8
+currentClientSMPRelayVersion = VersionSMP 7

 legacyServerSMPRelayVersion :: VersionSMP
 legacyServerSMPRelayVersion = VersionSMP 6

 currentServerSMPRelayVersion :: VersionSMP
-currentServerSMPRelayVersion = VersionSMP 8
-
-- Max SMP protocol version to be used in e2e encrypted
-- connection between client and server, as defined by SMP proxy.
-- SMP proxy sets it to lower than its current version
-- to prevent client version fingerprinting by the
-- destination relays when clients upgrade at different times.
-proxiedSMPRelayVersion :: VersionSMP
-proxiedSMPRelayVersion = VersionSMP 8
+currentServerSMPRelayVersion = VersionSMP 7

 -- minimal supported protocol version is 4
 -- TODO remove code that supports sending commands without batching
@@ -189,10 +172,6 @@ legacyServerSMPRelayVRange = mkVersionRange batchCmdsSMPVersion legacyServerSMPR
 supportedServerSMPRelayVRange :: VersionRangeSMP
 supportedServerSMPRelayVRange = mkVersionRange batchCmdsSMPVersion currentServerSMPRelayVersion

-- This range initially allows only version 8 - see the comment above.
-proxiedSMPRelayVRange :: VersionRangeSMP
-proxiedSMPRelayVRange = mkVersionRange sendingProxySMPVersion proxiedSMPRelayVersion
-
 supportedSMPHandshakes :: [ALPN]
 supportedSMPHandshakes = ["smp/1"]

@@ -217,15 +196,13 @@ class Transport c where
  transportConfig :: c -> TransportConfig

  -- | Upgrade server TLS context to connection (used in the server)
-  getServerConnection :: PeerId -> TransportConfig -> X.CertificateChain -> T.Context -> IO c
+  getServerConnection :: TransportConfig -> X.CertificateChain -> T.Context -> IO c

  -- | Upgrade client TLS context to connection (used in the client)
  getClientConnection :: TransportConfig -> X.CertificateChain -> T.Context -> IO c

  getServerCerts :: c -> X.CertificateChain

-  getPeerId :: c -> PeerId
-
  -- | tls-unique channel binding per RFC5929
  tlsUnique :: c -> SessionId

@@ -266,7 +243,6 @@ getServerVerifyKey c =
 data TLS = TLS
  { tlsContext :: T.Context,
    tlsPeer :: TransportPeer,
-    tlsPeerId :: PeerId,
    tlsUniq :: ByteString,
    tlsBuffer :: TBuffer,
    tlsALPN :: Maybe ALPN,
@@ -285,13 +261,13 @@ connectTLS host_ TransportConfig {logTLSErrors} params sock =
    logThrow e = putStrLn ("TLS error" <> host <> ": " <> show e) >> E.throwIO e
    host = maybe "" (\h -> " (" <> h <> ")") host_

-getTLS :: TransportPeer -> PeerId -> TransportConfig -> X.CertificateChain -> T.Context -> IO TLS
-getTLS tlsPeer tlsPeerId cfg tlsServerCerts cxt = withTlsUnique tlsPeer cxt newTLS
+getTLS :: TransportPeer -> TransportConfig -> X.CertificateChain -> T.Context -> IO TLS
+getTLS tlsPeer cfg tlsServerCerts cxt = withTlsUnique tlsPeer cxt newTLS
  where
    newTLS tlsUniq = do
      tlsBuffer <- atomically newTBuffer
      tlsALPN <- T.getNegotiatedProtocol cxt
-      pure TLS {tlsContext = cxt, tlsPeerId, tlsALPN, tlsTransportConfig = cfg, tlsServerCerts, tlsPeer, tlsUniq, tlsBuffer}
+      pure TLS {tlsContext = cxt, tlsALPN, tlsTransportConfig = cfg, tlsServerCerts, tlsPeer, tlsUniq, tlsBuffer}

 withTlsUnique :: TransportPeer -> T.Context -> (ByteString -> IO c) -> IO c
 withTlsUnique peer cxt f =
@@ -325,8 +301,7 @@ instance Transport TLS where
  transportPeer = tlsPeer
  transportConfig = tlsTransportConfig
  getServerConnection = getTLS TServer
-  getClientConnection = getTLS TClient 0
-  getPeerId = tlsPeerId
+  getClientConnection = getTLS TClient
  getServerCerts = tlsServerCerts
  getSessionALPN = tlsALPN
  tlsUnique = tlsUniq
@@ -363,8 +338,6 @@ type THandleSMP c p = THandle SMPVersion c p
 data THandleParams v p = THandleParams
  { sessionId :: SessionId,
    blockSize :: Int,
-    -- | server protocol version range
-    thServerVRange :: VersionRange v,
    -- | agreed server protocol version
    thVersion :: Version v,
    -- | peer public key for command authorization and shared secrets for entity ID encryption
@@ -397,7 +370,6 @@ data ServerHandshake = ServerHandshake
  { smpVersionRange :: VersionRangeSMP,
    sessionId :: SessionId,
    -- pub key to agree shared secrets for command authorization and entity ID encryption.
-    -- todo C.PublicKeyX25519
    authPubKey :: Maybe (X.CertificateChain, X.SignedExact X.PubKey)
  }

@@ -449,8 +421,6 @@ authEncryptCmdsP v p = if v >= authCmdsSMPVersion then optional p else pure Noth
 data TransportError
  = -- | error parsing transport block
    TEBadBlock
-  | -- | incompatible client or server version
-    TEVersion
  | -- | message does not fit in transport block
    TELargeMsg
  | -- | incorrect session ID
@@ -466,29 +436,31 @@ data TransportError
 data HandshakeError
  = -- | parsing error
    PARSE
+  | -- | incompatible peer version
+    VERSION
  | -- | incorrect server identity
    IDENTITY
  | -- | v7 authentication failed
    BAD_AUTH
  deriving (Eq, Read, Show, Exception)

-instance Encoding TransportError where
-  smpP =
-    A.takeTill (== ' ') >>= \case
-      "BLOCK" -> pure TEBadBlock
-      "VERSION" -> pure TEVersion
-      "LARGE_MSG" -> pure TELargeMsg
-      "SESSION" -> pure TEBadSession
-      "NO_AUTH" -> pure TENoServerAuth
-      "HANDSHAKE" -> TEHandshake <$> (A.space *> parseRead1)
-      _ -> fail "bad TransportError"
-  smpEncode = \case
-    TEBadBlock -> "BLOCK"
-    TEVersion -> "VERSION"
-    TELargeMsg -> "LARGE_MSG"
-    TEBadSession -> "SESSION"
-    TENoServerAuth -> "NO_AUTH"
-    TEHandshake e -> "HANDSHAKE " <> bshow e
+-- | SMP encrypted transport error parser.
+transportErrorP :: Parser TransportError
+transportErrorP =
+  "BLOCK" $> TEBadBlock
+    <|> "LARGE_MSG" $> TELargeMsg
+    <|> "SESSION" $> TEBadSession
+    <|> "NO_AUTH" $> TENoServerAuth
+    <|> "HANDSHAKE " *> (TEHandshake <$> parseRead1)
+
+-- | Serialize SMP encrypted transport error.
+serializeTransportError :: TransportError -> ByteString
+serializeTransportError = \case
+  TEBadBlock -> "BLOCK"
+  TELargeMsg -> "LARGE_MSG"
+  TEBadSession -> "SESSION"
+  TENoServerAuth -> "NO_AUTH"
+  TEHandshake e -> "HANDSHAKE " <> bshow e

 -- | Pad and send block to SMP transport.
 tPutBlock :: Transport c => THandle v c p -> ByteString -> IO (Either TransportError ())
@@ -518,10 +490,9 @@ smpServerHandshake serverSignKey c (k, pk) kh smpVRange = do
    ClientHandshake {smpVersion = v, keyHash, authPubKey = k'}
      | keyHash /= kh ->
          throwE $ TEHandshake IDENTITY
-      | otherwise ->
-          case compatibleVRange' smpVersionRange v of
-            Just (Compatible vr) -> pure $ smpTHandleServer th v vr pk k'
-            Nothing -> throwE TEVersion
+      | v `isCompatible` smpVersionRange ->
+          pure $ smpThHandleServer th v pk k'
+      | otherwise -> throwE $ TEHandshake VERSION

 -- | Client SMP transport handshake.
 --
@@ -532,8 +503,8 @@ smpClientHandshake c ks_ keyHash@(C.KeyHash kh) smpVRange = do
  ServerHandshake {sessionId = sessId, smpVersionRange, authPubKey} <- getHandshake th
  if sessionId /= sessId
    then throwE TEBadSession
-    else case smpVersionRange `compatibleVRange` smpVRange of
-      Just (Compatible vr) -> do
+    else case smpVersionRange `compatibleVersion` smpVRange of
+      Just (Compatible v) -> do
        ck_ <- forM authPubKey $ \certKey@(X.CertificateChain cert, exact) ->
          liftEitherWith (const $ TEHandshake BAD_AUTH) $ do
            case cert of
@@ -542,33 +513,26 @@ smpClientHandshake c ks_ keyHash@(C.KeyHash kh) smpVRange = do
            serverKey <- getServerVerifyKey c
            pubKey <- C.verifyX509 serverKey exact
            (,certKey) <$> (C.x509ToPublic (pubKey, []) >>= C.pubKey)
-        let v = maxVersion vr
        sendHandshake th $ ClientHandshake {smpVersion = v, keyHash, authPubKey = fst <$> ks_}
-        pure $ smpTHandleClient th v vr (snd <$> ks_) ck_
-      Nothing -> throwE TEVersion
+        pure $ smpThHandleClient th v (snd <$> ks_) ck_
+      Nothing -> throwE $ TEHandshake VERSION

-smpTHandleServer :: forall c. THandleSMP c 'TServer -> VersionSMP -> VersionRangeSMP -> C.PrivateKeyX25519 -> Maybe C.PublicKeyX25519 -> THandleSMP c 'TServer
-smpTHandleServer th v vr pk k_ =
+smpThHandleServer :: forall c. THandleSMP c 'TServer -> VersionSMP -> C.PrivateKeyX25519 -> Maybe C.PublicKeyX25519 -> THandleSMP c 'TServer
+smpThHandleServer th v pk k_ =
  let thAuth = THAuthServer {serverPrivKey = pk, sessSecret' = (`C.dh'` pk) <$> k_}
-   in smpTHandle_ th v vr (Just thAuth)
+   in smpThHandle_ th v (Just thAuth)

-smpTHandleClient :: forall c. THandleSMP c 'TClient -> VersionSMP -> VersionRangeSMP -> Maybe C.PrivateKeyX25519 -> Maybe (C.PublicKeyX25519, (X.CertificateChain, X.SignedExact X.PubKey)) -> THandleSMP c 'TClient
-smpTHandleClient th v vr pk_ ck_ =
+smpThHandleClient :: forall c. THandleSMP c 'TClient -> VersionSMP -> Maybe C.PrivateKeyX25519 -> Maybe (C.PublicKeyX25519, (X.CertificateChain, X.SignedExact X.PubKey)) -> THandleSMP c 'TClient
+smpThHandleClient th v pk_ ck_ =
  let thAuth = (\(k, ck) -> THAuthClient {serverPeerPubKey = k, serverCertKey = ck, sessSecret = C.dh' k <$> pk_}) <$> ck_
-   in smpTHandle_ th v vr thAuth
+   in smpThHandle_ th v thAuth

-smpTHandle_ :: forall c p. THandleSMP c p -> VersionSMP -> VersionRangeSMP -> Maybe (THandleAuth p) -> THandleSMP c p
-smpTHandle_ th@THandle {params} v vr thAuth =
+smpThHandle_ :: forall c p. THandleSMP c p -> VersionSMP -> Maybe (THandleAuth p) -> THandleSMP c p
+smpThHandle_ th@THandle {params} v thAuth =
  -- TODO drop SMP v6: make thAuth non-optional
-  let params' = params {thVersion = v, thServerVRange = vr, thAuth, implySessId = v >= authCmdsSMPVersion}
+  let params' = params {thVersion = v, thAuth, implySessId = v >= authCmdsSMPVersion}
   in (th :: THandleSMP c p) {params = params'}

-- This function is only used with v >= 8, so currently it's a simple record update.
-- It may require some parameters update in the future, to be consistent with smpTHandle_.
-smpTHParamsSetVersion :: VersionSMP -> THandleParams SMPVersion p -> THandleParams SMPVersion p
-smpTHParamsSetVersion v params = params {thVersion = v}
-{-# INLINE smpTHParamsSetVersion #-}
-
 sendHandshake :: (Transport c, Encoding smp) => THandle v c p -> smp -> ExceptT TransportError IO ()
 sendHandshake th = ExceptT . tPutBlock th . smpEncode

@@ -579,34 +543,7 @@ getHandshake th = ExceptT $ (first (\_ -> TEHandshake PARSE) . A.parseOnly smpP
 smpTHandle :: Transport c => c -> THandleSMP c p
 smpTHandle c = THandle {connection = c, params}
  where
-    v = VersionSMP 0
-    params =
-      THandleParams
-        { sessionId = tlsUnique c,
-          blockSize = smpBlockSize,
-          thServerVRange = versionToRange v,
-          thVersion = v,
-          thAuth = Nothing,
-          implySessId = False,
-          batch = True
-        }
-
-- | Stats key, hashed from IPs, circuits etc. We don't want to keep actual identities, just attach counters to them.
-type PeerId = Int -- XXX: perhaps more fields needed if we want subnet escalation
-
-clientPeerId :: Socket -> IO PeerId
-clientPeerId = fmap addrPeerId . SA.getPeerName
-
-addrPeerId :: SockAddr -> PeerId
-addrPeerId peer = hash peer6 -- XXX: for extra paranoia can be salted with a seed randomized on server start
-  where
-    -- ingore ports and fluff, normalize to ipv6 address space
-    -- most of the ipv6 is unused as clients get /64 subnets for a few IPs, so 128bit to 64bit hashing is ok for using as intmap keys
-    peer6 = case peer of
-      SockAddrInet _port a -> embed4in6 a
-      SockAddrInet6 _port _flow a _scope -> a
-      SockAddrUnix _path -> error "use for TOR circuits?"
-    embed4in6 v4 = (0, 0, 0xFFFF, v4) -- RFC4038: the IPv6 address ::FFFF:x.y.z.w represents the IPv4 address x.y.z.w.
+    params = THandleParams {sessionId = tlsUnique c, blockSize = smpBlockSize, thVersion = VersionSMP 0, thAuth = Nothing, implySessId = False, batch = True}

 $(J.deriveJSON (sumTypeJSON id) ''HandshakeError)

@@ -14,7 +14,6 @@ import Control.Monad
 import Data.ByteString.Char8 (ByteString)
 import Data.Functor (($>))
 import Data.Time (UTCTime, getCurrentTime)
-import qualified Data.X509 as X
 import qualified Data.X509.CertificateStore as XS
 import Network.HPACK (BufferSize)
 import Network.HTTP2.Client (ClientConfig (..), Request, Response)
@@ -30,6 +29,7 @@ import Simplex.Messaging.Transport.HTTP2
 import Simplex.Messaging.Util (eitherToMaybe)
 import UnliftIO.STM
 import UnliftIO.Timeout
+import qualified Data.X509 as X

 data HTTP2Client = HTTP2Client
  { action :: Maybe (Async HTTP2Response),
@@ -23,7 +23,7 @@ hReceiveFile getBody h size = get $ fromIntegral size
      if
        | chSize > sz -> pure (chSize - sz)
        | chSize > 0 -> B.hPut h ch >> get (sz - chSize)
-        | otherwise -> pure (-sz)
+        | otherwise -> pure (-fromIntegral sz)

 hSendFile :: Handle -> (Builder -> IO ()) -> Word32 -> IO ()
 hSendFile h send = go
@@ -19,7 +19,7 @@ module Simplex.Messaging.Transport.Server
    loadTLSServerParams,
    loadFingerprint,
    smpServerHandshake,
-    tlsServerCredentials,
+    tlsServerCredentials
  )
 where

@@ -35,14 +35,11 @@ import Data.Maybe (fromJust, fromMaybe)
 import qualified Data.X509 as X
 import Data.X509.Validation (Fingerprint (..))
 import qualified Data.X509.Validation as XV
-import Foreign.C.Error
-import GHC.IO.Exception (ioe_errno)
 import Network.Socket
 import qualified Network.TLS as T
 import Simplex.Messaging.Transport
 import Simplex.Messaging.Util (catchAll_, labelMyThread, tshow)
 import System.Exit (exitFailure)
-import System.IO.Error (tryIOError)
 import System.Mem.Weak (Weak, deRefWeak)
 import UnliftIO (timeout)
 import UnliftIO.Concurrent
@@ -98,9 +95,8 @@ runTransportServerSocketState ss started getSocket threadLabel serverParams cfg
    tCfg = serverTransportConfig cfg
    setup conn = timeout (tlsSetupTimeout cfg) $ do
      labelMyThread $ threadLabel <> "/setup"
-      peerId <- clientPeerId conn
      tls <- connectTLS Nothing tCfg serverParams conn
-      getServerConnection peerId tCfg (fst $ tlsServerCredentials serverParams) tls
+      getServerConnection tCfg (fst $ tlsServerCredentials serverParams) tls

 tlsServerCredentials :: T.ServerParams -> (X.CertificateChain, X.PrivKey)
 tlsServerCredentials serverParams = case T.sharedCredentials $ T.serverShared serverParams of
@@ -117,36 +113,15 @@ runTCPServer started port server = do
 runTCPServerSocket :: SocketState -> TMVar Bool -> IO Socket -> (Socket -> IO ()) -> IO ()
 runTCPServerSocket (accepted, gracefullyClosed, clients) started getSocket server =
  E.bracket getSocket (closeServer started clients) $ \sock ->
-    forever . E.bracketOnError (safeAccept sock) (close . fst) $ \(conn, _peer) -> do
+    forever . E.bracketOnError (accept sock) (close . fst) $ \(conn, _peer) -> do
      cId <- atomically $ stateTVar accepted $ \cId -> let cId' = cId + 1 in cId `seq` (cId', cId')
      let closeConn _ = do
            atomically $ modifyTVar' clients $ IM.delete cId
            gracefulClose conn 5000 `catchAll_` pure () -- catchAll_ is needed here in case the connection was closed earlier
-            atomically $ modifyTVar' gracefullyClosed (+ 1)
+            atomically $ modifyTVar' gracefullyClosed (+1)
      tId <- mkWeakThreadId =<< server conn `forkFinally` closeConn
      atomically $ modifyTVar' clients $ IM.insert cId tId

-- | Recover from errors in `accept` whenever it is safe.
-- Some errors are safe to ignore, while blindly restaring `accept` may trigger a busy loop.
--
-- man accept says:
-- @
-- For  reliable  operation the application should detect the network errors defined for the protocol after accept() and treat them like EAGAIN by retrying.
-- In  the  case  of  TCP/IP, these are ENETDOWN, EPROTO, ENOPROTOOPT, EHOSTDOWN, ENONET, EHOSTUNREACH, EOPNOTSUPP, and ENETUNREACH.
-- @
-safeAccept :: Socket -> IO (Socket, SockAddr)
-safeAccept sock =
-  tryIOError (accept sock) >>= \case
-    Right r -> pure r
-    Left e
-      | retryAccept -> logWarn err >> safeAccept sock
-      | otherwise -> logError err >> E.throwIO e
-      where
-        retryAccept = maybe False ((`elem` again) . Errno) errno
-        again = [eAGAIN, eNETDOWN, ePROTO, eNOPROTOOPT, eHOSTDOWN, eNONET, eHOSTUNREACH, eOPNOTSUPP, eNETUNREACH]
-        err = "socket accept error: " <> tshow e <> maybe "" ((", errno=" <>) . tshow) errno
-        errno = ioe_errno e
-
 type SocketState = (TVar Int, TVar Int, TVar (IntMap (Weak ThreadId)))

 newSocketState :: STM SocketState
@@ -20,7 +20,6 @@ import Simplex.Messaging.Transport
    TransportConfig (..),
    TransportError (..),
    TransportPeer (..),
-    PeerId,
    closeTLS,
    smpBlockSize,
    withTlsUnique,
@@ -29,7 +28,6 @@ import Simplex.Messaging.Transport.Buffer (trimCR)

 data WS = WS
  { wsPeer :: TransportPeer,
-    wsPeerId :: PeerId,
    tlsUniq :: ByteString,
    wsALPN :: Maybe ALPN,
    wsStream :: Stream,
@@ -56,14 +54,11 @@ instance Transport WS where
  transportConfig :: WS -> TransportConfig
  transportConfig = wsTransportConfig

-  getServerConnection :: PeerId -> TransportConfig -> X.CertificateChain -> T.Context -> IO WS
+  getServerConnection :: TransportConfig -> X.CertificateChain -> T.Context -> IO WS
  getServerConnection = getWS TServer

  getClientConnection :: TransportConfig -> X.CertificateChain -> T.Context -> IO WS
-  getClientConnection = getWS TClient 0
-
-  getPeerId :: WS -> PeerId
-  getPeerId = wsPeerId
+  getClientConnection = getWS TClient

  getServerCerts :: WS -> X.CertificateChain
  getServerCerts = wsServerCerts
@@ -94,14 +89,14 @@ instance Transport WS where
      then E.throwIO TEBadBlock
      else pure $ B.init s

-getWS :: TransportPeer -> PeerId -> TransportConfig -> X.CertificateChain -> T.Context -> IO WS
-getWS wsPeer wsPeerId cfg wsServerCerts cxt = withTlsUnique wsPeer cxt connectWS
+getWS :: TransportPeer -> TransportConfig -> X.CertificateChain -> T.Context -> IO WS
+getWS wsPeer cfg wsServerCerts cxt = withTlsUnique wsPeer cxt connectWS
  where
    connectWS tlsUniq = do
      s <- makeTLSContextStream cxt
      wsConnection <- connectPeer wsPeer s
      wsALPN <- T.getNegotiatedProtocol cxt
-      pure $ WS {wsPeer, wsPeerId, tlsUniq, wsALPN, wsStream = s, wsConnection, wsTransportConfig = cfg, wsServerCerts}
+      pure $ WS {wsPeer, tlsUniq, wsALPN, wsStream = s, wsConnection, wsTransportConfig = cfg, wsServerCerts}
    connectPeer :: TransportPeer -> Stream -> IO Connection
    connectPeer TServer = acceptClientRequest
    connectPeer TClient = sendClientRequest
@@ -7,7 +7,6 @@ import qualified Control.Exception as E
 import Control.Monad
 import Control.Monad.Except
 import Control.Monad.IO.Unlift
-import Control.Monad.Trans.Except
 import Data.Bifunctor (first)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
@@ -98,15 +97,15 @@ catchAll_ :: IO a -> IO a -> IO a
 catchAll_ a = catchAll a . const
 {-# INLINE catchAll_ #-}

-tryAllErrors :: MonadUnliftIO m => (E.SomeException -> e) -> ExceptT e m a -> ExceptT e m (Either e a)
-tryAllErrors err action = ExceptT $ Right <$> runExceptT action `UE.catch` (pure . Left . err)
+tryAllErrors :: (MonadUnliftIO m, MonadError e m) => (E.SomeException -> e) -> m a -> m (Either e a)
+tryAllErrors err action = tryError action `UE.catch` (pure . Left . err)
 {-# INLINE tryAllErrors #-}

 tryAllErrors' :: MonadUnliftIO m => (E.SomeException -> e) -> ExceptT e m a -> m (Either e a)
 tryAllErrors' err action = runExceptT action `UE.catch` (pure . Left . err)
 {-# INLINE tryAllErrors' #-}

-catchAllErrors :: MonadUnliftIO m => (E.SomeException -> e) -> ExceptT e m a -> (e -> ExceptT e m a) -> ExceptT e m a
+catchAllErrors :: (MonadUnliftIO m, MonadError e m) => (E.SomeException -> e) -> m a -> (e -> m a) -> m a
 catchAllErrors err action handler = tryAllErrors err action >>= either handler pure
 {-# INLINE catchAllErrors #-}

@@ -114,12 +113,12 @@ catchAllErrors' :: MonadUnliftIO m => (E.SomeException -> e) -> ExceptT e m a ->
 catchAllErrors' err action handler = tryAllErrors' err action >>= either handler pure
 {-# INLINE catchAllErrors' #-}

-catchThrow :: MonadUnliftIO m => ExceptT e m a -> (E.SomeException -> e) -> ExceptT e m a
-catchThrow action err = catchAllErrors err action throwE
+catchThrow :: (MonadUnliftIO m, MonadError e m) => m a -> (E.SomeException -> e) -> m a
+catchThrow action err = catchAllErrors err action throwError
 {-# INLINE catchThrow #-}

-allFinally :: MonadUnliftIO m => (E.SomeException -> e) -> ExceptT e m a -> ExceptT e m b -> ExceptT e m a
-allFinally err action final = tryAllErrors err action >>= \r -> final >> either throwE pure r
+allFinally :: (MonadUnliftIO m, MonadError e m) => (E.SomeException -> e) -> m a -> m b -> m a
+allFinally err action final = tryAllErrors err action >>= \r -> final >> either throwError pure r
 {-# INLINE allFinally #-}

 eitherToMaybe :: Either a b -> Maybe b
@@ -150,17 +149,15 @@ safeDecodeUtf8 = decodeUtf8With onError
    onError _ _ = Just '?'

 timeoutThrow :: MonadUnliftIO m => e -> Int -> ExceptT e m a -> ExceptT e m a
-timeoutThrow e ms action = ExceptT (sequence <$> (ms `timeout` runExceptT action)) >>= maybe (throwE e) pure
+timeoutThrow e ms action = ExceptT (sequence <$> (ms `timeout` runExceptT action)) >>= maybe (throwError e) pure

 threadDelay' :: Int64 -> IO ()
-threadDelay' = loop
-  where
-    loop time
-      | time <= 0 = pure ()
-      | otherwise = do
-          let maxWait = min time $ fromIntegral (maxBound :: Int)
-          threadDelay $ fromIntegral maxWait
-          loop $ time - maxWait
+threadDelay' time
+  | time <= 0 = pure ()
+threadDelay' time = do
+  let maxWait = min time $ fromIntegral (maxBound :: Int)
+  threadDelay $ fromIntegral maxWait
+  when (maxWait /= time) $ threadDelay' (time - maxWait)

 diffToMicroseconds :: NominalDiffTime -> Int64
 diffToMicroseconds diff = fromIntegral ((truncate $ diff * 1000000) :: Integer)
@@ -23,8 +23,6 @@ module Simplex.Messaging.Version
    isCompatibleRange,
    proveCompatible,
    compatibleVersion,
-    compatibleVRange,
-    compatibleVRange',
  )
 where

@@ -100,7 +98,6 @@ class VersionScope v => VersionI v a | a -> v where
 class VersionScope v => VersionRangeI v a | a -> v where
  type VersionT v a
  versionRange :: a -> VersionRange v
-  toVersionRange :: a -> VersionRange v -> a
  toVersionT :: a -> Version v -> VersionT v a

 instance VersionScope v => VersionI v (Version v) where
@@ -111,7 +108,6 @@ instance VersionScope v => VersionI v (Version v) where
 instance VersionScope v => VersionRangeI v (VersionRange v) where
  type VersionT v (VersionRange v) = Version v
  versionRange = id
-  toVersionRange _ vr = vr
  toVersionT _ v = v

 newtype Compatible a = Compatible_ a
@@ -139,24 +135,5 @@ compatibleVersion x vr =
    max1 = maxVersion $ versionRange x
    max2 = maxVersion vr

-- | intersection of version ranges
-compatibleVRange :: VersionRangeI v a => a -> VersionRange v -> Maybe (Compatible a)
-compatibleVRange x vr =
-  compatibleVRange_ x (max min1 min2) (min max1 max2)
-  where
-    VRange min1 max1 = versionRange x
-    VRange min2 max2 = vr
-
-- | version range capped by compatible version
-compatibleVRange' :: VersionRangeI v a => a -> Version v -> Maybe (Compatible a)
-compatibleVRange' x v
-  | v <= max1 = compatibleVRange_ x min1 v
-  | otherwise = Nothing
-  where
-    VRange min1 max1 = versionRange x
-
-compatibleVRange_ :: VersionRangeI v a => a -> Version v -> Version v -> Maybe (Compatible a)
-compatibleVRange_ x v1 v2 = Compatible_ . toVersionRange x <$> safeVersionRange v1 v2
-
 mkCompatibleIf :: a -> Bool -> Maybe (Compatible a)
 x `mkCompatibleIf` cond = if cond then Just $ Compatible_ x else Nothing
@@ -30,7 +30,6 @@ import Control.Logger.Simple
 import Control.Monad
 import Control.Monad.Except
 import Control.Monad.IO.Class
-import Control.Monad.Trans.Except
 import Crypto.Random (ChaChaDRG)
 import qualified Data.Aeson as J
 import Data.ByteString (ByteString)
@@ -107,9 +106,9 @@ connectRCHost drg pairing@RCHostPairing {caKey, caCert, idPrivKey, knownHost} ct
  action <- liftIO $ runClient c r hostKeys
  -- wait for the port to make invitation
  portNum <- atomically $ readTMVar startedPort
-  signedInv@RCSignedInvitation {invitation} <- maybe (throwE RCETLSStartFailed) (liftIO . mkInvitation hostKeys address) portNum
+  signedInv@RCSignedInvitation {invitation} <- maybe (throwError RCETLSStartFailed) (liftIO . mkInvitation hostKeys address) portNum
  when multicast $ case knownHost of
-    Nothing -> throwE RCENewController
+    Nothing -> throwError RCENewController
    Just KnownHostPairing {hostDhPubKey} -> do
      ann <- liftIO . async . runExceptT $ announceRC drg 60 idPrivKey hostDhPubKey hostKeys invitation
      atomically $ putTMVar announcer ann
@@ -118,7 +117,7 @@ connectRCHost drg pairing@RCHostPairing {caKey, caCert, idPrivKey, knownHost} ct
    findCtrlAddress :: ExceptT RCErrorType IO (NonEmpty RCCtrlAddress)
    findCtrlAddress = do
      found' <- liftIO $ getLocalAddress rcAddrPrefs_
-      maybe (throwE RCENoLocalAddress) pure $ L.nonEmpty found'
+      maybe (throwError RCENoLocalAddress) pure $ L.nonEmpty found'
    mkClient :: IO RCHClient_
    mkClient = do
      startedPort <- newEmptyTMVarIO
@@ -212,10 +211,10 @@ prepareHostSession
    let sharedKey = C.dh' dhPubKey dhPrivKey
    helloBody <- liftEitherWith (const RCEDecrypt) $ C.cbDecrypt sharedKey nonce encBody
    hostHello@RCHostHello {v, ca, kem = kemPubKey} <- liftEitherWith RCESyntax $ J.eitherDecodeStrict helloBody
-    unless (ca == tlsHostFingerprint) $ throwE RCEIdentity
+    unless (ca == tlsHostFingerprint) $ throwError RCEIdentity
    (kemCiphertext, kemSharedKey) <- liftIO $ sntrup761Enc drg kemPubKey
    let hybridKey = kemHybridSecret dhPubKey dhPrivKey kemSharedKey
-    unless (isCompatible v supportedRCPVRange) $ throwE RCEVersion
+    unless (isCompatible v supportedRCPVRange) $ throwError RCEVersion
    let keys = HostSessKeys {hybridKey, idPrivKey, sessPrivKey}
    knownHost' <- updateKnownHost ca dhPubKey
    let ctrlHello = RCCtrlHello {}
@@ -228,7 +227,7 @@ prepareHostSession
      updateKnownHost :: C.KeyHash -> C.PublicKeyX25519 -> ExceptT RCErrorType IO KnownHostPairing
      updateKnownHost ca hostDhPubKey = case knownHost_ of
        Just h -> do
-          unless (hostFingerprint h == tlsHostFingerprint) . throwE $
+          unless (hostFingerprint h == tlsHostFingerprint) . throwError $
            RCEInternal "TLS host CA is different from host pairing, should be caught in TLS handshake"
          pure (h :: KnownHostPairing) {hostDhPubKey}
        Nothing -> pure KnownHostPairing {hostFingerprint = ca, hostDhPubKey}
@@ -258,7 +257,7 @@ connectRCCtrl drg (RCVerifiedInvitation inv@RCInvitation {ca, idkey}) pairing_ h
      pure RCCtrlPairing {caKey, caCert, ctrlFingerprint = ca, idPubKey = idkey, dhPrivKey, prevDhPrivKey = Nothing}
    updateCtrlPairing :: RCCtrlPairing -> ExceptT RCErrorType IO RCCtrlPairing
    updateCtrlPairing pairing@RCCtrlPairing {ctrlFingerprint, idPubKey, dhPrivKey = currDhPrivKey} = do
-      unless (ca == ctrlFingerprint && idPubKey == idkey) $ throwE RCEIdentity
+      unless (ca == ctrlFingerprint && idPubKey == idkey) $ throwError RCEIdentity
      (_, dhPrivKey) <- atomically $ C.generateKeyPair drg
      pure pairing {dhPrivKey, prevDhPrivKey = Just currDhPrivKey}

@@ -279,7 +278,7 @@ connectRCCtrl_ drg pairing'@RCCtrlPairing {caKey, caCert} inv@RCInvitation {ca,
      clientCredentials <-
        liftIO (genTLSCredentials drg caKey caCert) >>= \case
          TLS.Credentials (creds : _) -> pure $ Just creds
-          _ -> throwE $ RCEInternal "genTLSCredentials must generate credentials"
+          _ -> throwError $ RCEInternal "genTLSCredentials must generate credentials"
      let clientConfig = defaultTransportClientConfig {clientCredentials}
      ExceptT . runTransportClient clientConfig Nothing host (show port) (Just ca) $ \tls@TLS {tlsBuffer, tlsContext} -> runExceptT $ do
        -- pump socket to detect connection problems
@@ -304,13 +303,11 @@ connectRCCtrl_ drg pairing'@RCCtrlPairing {caKey, caCert} inv@RCInvitation {ca,
            logDebug "Session ended"

 catchRCError :: ExceptT RCErrorType IO a -> (RCErrorType -> ExceptT RCErrorType IO a) -> ExceptT RCErrorType IO a
-catchRCError = catchAllErrors $ \e -> case fromException e of
-  Just (TLS.Terminated _ _ (TLS.Error_Protocol (_, _, TLS.UnknownCa))) -> RCEIdentity
-  _ -> RCEException $ show e
+catchRCError = catchAllErrors (RCEException . show)
 {-# INLINE catchRCError #-}

 putRCError :: ExceptT RCErrorType IO a -> TMVar (Either RCErrorType b) -> ExceptT RCErrorType IO a
-a `putRCError` r = a `catchRCError` \e -> atomically (tryPutTMVar r $ Left e) >> throwE e
+a `putRCError` r = a `catchRCError` \e -> atomically (tryPutTMVar r $ Left e) >> throwError e

 sendRCPacket :: Encoding a => TLS -> a -> ExceptT RCErrorType IO ()
 sendRCPacket tls pkt = do
@@ -320,7 +317,7 @@ sendRCPacket tls pkt = do
 receiveRCPacket :: Encoding a => TLS -> ExceptT RCErrorType IO a
 receiveRCPacket tls = do
  b <- liftIO $ cGet tls xrcpBlockSize
-  when (B.length b /= xrcpBlockSize) $ throwE RCEBlockSize
+  when (B.length b /= xrcpBlockSize) $ throwError RCEBlockSize
  b' <- liftEitherWith (const RCEBlockSize) $ C.unPad b
  liftEitherWith RCESyntax $ smpDecode b'

@@ -332,7 +329,7 @@ prepareHostHello
  hostAppInfo = do
    logDebug "Preparing session"
    case compatibleVersion v supportedRCPVRange of
-      Nothing -> throwE RCEVersion
+      Nothing -> throwError RCEVersion
      Just (Compatible v') -> do
        nonce <- liftIO . atomically $ C.randomCbNonce drg
        (kemPubKey, kemPrivKey) <- liftIO $ sntrup761Keypair drg
@@ -358,7 +355,7 @@ prepareCtrlSession
      pure CtrlSessKeys {hybridKey, idPubKey, sessPubKey = skey}
    RCCtrlEncError {nonce, encMessage} -> do
      message <- liftEitherWith (const RCEDecrypt) $ C.cbDecrypt sharedKey nonce encMessage
-      throwE $ RCECtrlError $ T.unpack $ safeDecodeUtf8 message
+      throwError $ RCECtrlError $ T.unpack $ safeDecodeUtf8 message

 -- * Multicast discovery

@@ -385,7 +382,7 @@ discoverRCCtrl subscribers pairings =
      r@(_, RCVerifiedInvitation RCInvitation {host}) <- findRCCtrlPairing pairings encInvitation
      case source of
        SockAddrInet _ ha | THIPv4 (hostAddressToTuple ha) == host -> pure ()
-        _ -> throwE RCEInvitation
+        _ -> throwError RCEInvitation
      pure r
  where
    loop :: ExceptT RCErrorType IO a -> ExceptT RCErrorType IO a
@@ -395,8 +392,8 @@ findRCCtrlPairing :: NonEmpty RCCtrlPairing -> RCEncInvitation -> ExceptT RCErro
 findRCCtrlPairing pairings RCEncInvitation {dhPubKey, nonce, encInvitation} = do
  (pairing, signedInvStr) <- liftEither $ decrypt (L.toList pairings)
  signedInv <- liftEitherWith RCESyntax $ strDecode signedInvStr
-  inv@(RCVerifiedInvitation RCInvitation {dh = invDh}) <- maybe (throwE RCEInvitation) pure $ verifySignedInvitation signedInv
-  unless (invDh == dhPubKey) $ throwE RCEInvitation
+  inv@(RCVerifiedInvitation RCInvitation {dh = invDh}) <- maybe (throwError RCEInvitation) pure $ verifySignedInvitation signedInv
+  unless (invDh == dhPubKey) $ throwError RCEInvitation
  pure (pairing, inv)
  where
    decrypt :: [RCCtrlPairing] -> Either RCErrorType (RCCtrlPairing, ByteString)
@@ -436,7 +433,7 @@ rcEncryptBody drg hybridKey s = do
 rcDecryptBody :: KEMHybridSecret -> C.CbNonce -> LazyByteString -> ExceptT RCErrorType IO LazyByteString
 rcDecryptBody hybridKey nonce ct = do
  let len = LB.length ct - 16
-  when (len < 0) $ throwE RCEDecrypt
+  when (len < 0) $ throwError RCEDecrypt
  (ok, s) <- liftEitherWith (const RCEDecrypt) $ LC.kcbDecryptTailTag hybridKey nonce len ct
-  unless ok $ throwE RCEDecrypt
+  unless ok $ throwError RCEDecrypt
  pure s
@@ -123,7 +123,7 @@ instance StrEncoding RCSignedInvitation where
    idsig <- requiredP sigs "idsig" $ parseAll strP
    pure RCSignedInvitation {invitation, ssig, idsig}

-signInvitation :: C.PrivateKey 'C.Ed25519 -> C.PrivateKey 'C.Ed25519 -> RCInvitation -> RCSignedInvitation
+signInvitation :: C.PrivateKey C.Ed25519 -> C.PrivateKey C.Ed25519 -> RCInvitation -> RCSignedInvitation
 signInvitation sKey idKey invitation = RCSignedInvitation {invitation, ssig, idsig}
  where
    uri = strEncode invitation
@@ -7,17 +7,38 @@
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeApplications #-}
+{-# OPTIONS_GHC -fno-warn-incomplete-uni-patterns #-}

 module AgentTests (agentTests) where

 import AgentTests.ConnectionRequestTests
 import AgentTests.DoubleRatchetTests (doubleRatchetTests)
-import AgentTests.FunctionalAPITests (functionalAPITests)
+import AgentTests.FunctionalAPITests (functionalAPITests, inAnyOrder, pattern Msg, pattern Msg')
 import AgentTests.MigrationTests (migrationTests)
 import AgentTests.NotificationTests (notificationTests)
 import AgentTests.SQLiteTests (storeTests)
-import Simplex.Messaging.Transport (ATransport (..))
+import Control.Concurrent
+import Control.Monad (forM_, when)
+import Data.ByteString.Char8 (ByteString)
+import qualified Data.ByteString.Char8 as B
+import Data.Maybe (fromJust)
+import Data.Type.Equality
+import GHC.Stack (withFrozenCallStack)
+import Network.HTTP.Types (urlEncode)
+import SMPAgentClient
+import SMPClient (testKeyHash, testPort, testPort2, testStoreLogFile, withSmpServer, withSmpServerStoreLogOn)
+import Simplex.Messaging.Agent.Protocol hiding (CONF, INFO, MID, REQ)
+import qualified Simplex.Messaging.Agent.Protocol as A
+import Simplex.Messaging.Crypto.Ratchet (InitialKeys (..), PQEncryption (..), PQSupport (..), pattern IKPQOff, pattern IKPQOn, pattern PQEncOn, pattern PQSupportOff, pattern PQSupportOn)
+import qualified Simplex.Messaging.Crypto.Ratchet as CR
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Protocol (ErrorType (..))
+import Simplex.Messaging.Transport (ATransport (..), TProxy (..), Transport (..))
+import Simplex.Messaging.Util (bshow)
+import System.Directory (removeFile)
+import System.Timeout
 import Test.Hspec
+import Util

 agentTests :: ATransport -> Spec
 agentTests (ATransport t) = do
@@ -27,3 +48,596 @@ agentTests (ATransport t) = do
  describe "Notification tests" $ notificationTests (ATransport t)
  describe "SQLite store" storeTests
  describe "Migration tests" migrationTests
+  describe "SMP agent protocol syntax" $ syntaxTests t
+  describe "Establishing duplex connection (via agent protocol)" $ do
+    skip "These tests are disabled because the agent does not work correctly with multiple connected TCP clients" $
+      describe "one agent" $ do
+        it "should connect via one server and one agent" $ do
+          smpAgentTest2_1_1 $ testDuplexConnection t
+        it "should connect via one server and one agent (random IDs)" $ do
+          smpAgentTest2_1_1 $ testDuplexConnRandomIds t
+    it "should connect via one server and 2 agents" $ do
+      smpAgentTest2_2_1 $ testDuplexConnection t
+    it "should connect via one server and 2 agents (random IDs)" $ do
+      smpAgentTest2_2_1 $ testDuplexConnRandomIds t
+    describe "should connect via 2 servers and 2 agents" $ do
+      pqMatrix2 t smpAgentTest2_2_2 testDuplexConnection'
+    describe "should connect via 2 servers and 2 agents (random IDs)" $ do
+      pqMatrix2 t smpAgentTest2_2_2 testDuplexConnRandomIds'
+  describe "Establishing connections via `contact connection`" $ do
+    describe "should connect via contact connection with one server and 3 agents" $ do
+      pqMatrix3 t smpAgentTest3 testContactConnection
+    describe "should connect via contact connection with one server and 2 agents (random IDs)" $ do
+      pqMatrix2NoInv t smpAgentTest2_2_1 testContactConnRandomIds
+    it "should support rejecting contact request" $ do
+      smpAgentTest2_2_1 $ testRejectContactRequest t
+  describe "Connection subscriptions" $ do
+    it "should connect via one server and one agent" $ do
+      smpAgentTest3_1_1 $ testSubscription t
+    it "should send notifications to client when server disconnects" $ do
+      smpAgentServerTest $ testSubscrNotification t
+  describe "Message delivery and server reconnection" $ do
+    describe "should deliver messages after losing server connection and re-connecting" $
+      pqMatrix2 t smpAgentTest2_2_2_needs_server testMsgDeliveryServerRestart
+    it "should connect to the server when server goes up if it initially was down" $ do
+      smpAgentTestN [] $ testServerConnectionAfterError t
+    it "should deliver pending messages after agent restarting" $ do
+      smpAgentTest1_1_1 $ testMsgDeliveryAgentRestart t
+    it "should concurrently deliver messages to connections without blocking" $ do
+      smpAgentTest2_2_1 $ testConcurrentMsgDelivery t
+    it "should deliver messages if one of connections has quota exceeded" $ do
+      smpAgentTest2_2_1 $ testMsgDeliveryQuotaExceeded t
+    it "should resume delivering messages after exceeding quota once all messages are received" $ do
+      smpAgentTest2_2_1 $ testResumeDeliveryQuotaExceeded t
+
+type AEntityTransmission p e = (ACorrId, ConnId, ACommand p e)
+
+type AEntityTransmissionOrError p e = (ACorrId, ConnId, Either AgentErrorType (ACommand p e))
+
+tGetAgent :: Transport c => c -> IO (AEntityTransmissionOrError 'Agent 'AEConn)
+tGetAgent = tGetAgent'
+
+tGetAgent' :: forall c e. (Transport c, AEntityI e) => c -> IO (AEntityTransmissionOrError 'Agent e)
+tGetAgent' h = do
+  (corrId, connId, cmdOrErr) <- pGetAgent h
+  case cmdOrErr of
+    Right (APC e cmd) -> case testEquality e (sAEntity @e) of
+      Just Refl -> pure (corrId, connId, Right cmd)
+      _ -> error $ "unexpected command " <> show cmd
+    Left err -> pure (corrId, connId, Left err)
+
+pGetAgent :: forall c. Transport c => c -> IO (ATransmissionOrError 'Agent)
+pGetAgent h = do
+  (corrId, connId, cmdOrErr) <- tGet SAgent h
+  case cmdOrErr of
+    Right (APC _ CONNECT {}) -> pGetAgent h
+    Right (APC _ DISCONNECT {}) -> pGetAgent h
+    cmd -> pure (corrId, connId, cmd)
+
+-- | receive message to handle `h`
+(<#:) :: Transport c => c -> IO (AEntityTransmissionOrError 'Agent 'AEConn)
+(<#:) = tGetAgent
+
+(<#:?) :: Transport c => c -> IO (ATransmissionOrError 'Agent)
+(<#:?) = pGetAgent
+
+(<#:.) :: Transport c => c -> IO (AEntityTransmissionOrError 'Agent 'AENone)
+(<#:.) = tGetAgent'
+
+-- | send transmission `t` to handle `h` and get response
+(#:) :: Transport c => c -> (ByteString, ByteString, ByteString) -> IO (AEntityTransmissionOrError 'Agent 'AEConn)
+h #: t = tPutRaw h t >> (<#:) h
+
+-- | action and expected response
+-- `h #:t #> r` is the test that sends `t` to `h` and validates that the response is `r`
+(#>) :: IO (AEntityTransmissionOrError 'Agent 'AEConn) -> AEntityTransmission 'Agent 'AEConn -> Expectation
+action #> (corrId, connId, cmd) = withFrozenCallStack $ action `shouldReturn` (corrId, connId, Right cmd)
+
+-- | action and predicate for the response
+-- `h #:t =#> p` is the test that sends `t` to `h` and validates the response using `p`
+(=#>) :: IO (AEntityTransmissionOrError 'Agent 'AEConn) -> (AEntityTransmission 'Agent 'AEConn -> Bool) -> Expectation
+action =#> p = withFrozenCallStack $ action >>= (`shouldSatisfy` p . correctTransmission)
+
+pattern MID :: AgentMsgId -> ACommand 'Agent 'AEConn
+pattern MID msgId = A.MID msgId PQEncOn
+
+correctTransmission :: (ACorrId, ConnId, Either AgentErrorType cmd) -> (ACorrId, ConnId, cmd)
+correctTransmission (corrId, connId, cmdOrErr) = case cmdOrErr of
+  Right cmd -> (corrId, connId, cmd)
+  Left e -> error $ show e
+
+-- | receive message to handle `h` and validate that it is the expected one
+(<#) :: (HasCallStack, Transport c) => c -> AEntityTransmission 'Agent 'AEConn -> Expectation
+h <# (corrId, connId, cmd) = timeout 5000000 (h <#:) `shouldReturn` Just (corrId, connId, Right cmd)
+
+(<#.) :: (HasCallStack, Transport c) => c -> AEntityTransmission 'Agent 'AENone -> Expectation
+h <#. (corrId, connId, cmd) = timeout 5000000 (h <#:.) `shouldReturn` Just (corrId, connId, Right cmd)
+
+-- | receive message to handle `h` and validate it using predicate `p`
+(<#=) :: (HasCallStack, Transport c) => c -> (AEntityTransmission 'Agent 'AEConn -> Bool) -> Expectation
+h <#= p = timeout 5000000 (h <#:) >>= (`shouldSatisfy` p . correctTransmission . fromJust)
+
+(<#=?) :: (HasCallStack, Transport c) => c -> (ATransmission 'Agent -> Bool) -> Expectation
+h <#=? p = timeout 5000000 (h <#:?) >>= (`shouldSatisfy` p . correctTransmission . fromJust)
+
+-- | test that nothing is delivered to handle `h` during 10ms
+(#:#) :: Transport c => c -> String -> Expectation
+h #:# err = tryGet `shouldReturn` ()
+  where
+    tryGet =
+      10000 `timeout` tGetAgent h >>= \case
+        Just _ -> error err
+        _ -> return ()
+
+type PQMatrix2 c =
+  HasCallStack =>
+  TProxy c ->
+  (HasCallStack => (c -> c -> IO ()) -> Expectation) ->
+  (HasCallStack => (c, InitialKeys) -> (c, PQSupport) -> IO ()) ->
+  Spec
+
+pqMatrix2 :: PQMatrix2 c
+pqMatrix2 = pqMatrix2_ True
+
+pqMatrix2NoInv :: PQMatrix2 c
+pqMatrix2NoInv = pqMatrix2_ False
+
+pqMatrix2_ :: Bool -> PQMatrix2 c
+pqMatrix2_ pqInv _ smpTest test = do
+  it "dh/dh handshake" $ smpTest $ \a b -> test (a, IKPQOff) (b, PQSupportOff)
+  it "dh/pq handshake" $ smpTest $ \a b -> test (a, IKPQOff) (b, PQSupportOn)
+  it "pq/dh handshake" $ smpTest $ \a b -> test (a, IKPQOn) (b, PQSupportOff)
+  it "pq/pq handshake" $ smpTest $ \a b -> test (a, IKPQOn) (b, PQSupportOn)
+  when pqInv $ do
+    it "pq-inv/dh handshake" $ smpTest $ \a b -> test (a, IKUsePQ) (b, PQSupportOff)
+    it "pq-inv/pq handshake" $ smpTest $ \a b -> test (a, IKUsePQ) (b, PQSupportOn)
+
+pqMatrix3 ::
+  HasCallStack =>
+  TProxy c ->
+  (HasCallStack => (c -> c -> c -> IO ()) -> Expectation) ->
+  (HasCallStack => (c, InitialKeys) -> (c, PQSupport) -> (c, PQSupport) -> IO ()) ->
+  Spec
+pqMatrix3 _ smpTest test = do
+  it "dh" $ smpTest $ \a b c -> test (a, IKPQOff) (b, PQSupportOff) (c, PQSupportOff)
+  it "dh/dh/pq" $ smpTest $ \a b c -> test (a, IKPQOff) (b, PQSupportOff) (c, PQSupportOn)
+  it "dh/pq/dh" $ smpTest $ \a b c -> test (a, IKPQOff) (b, PQSupportOn) (c, PQSupportOff)
+  it "dh/pq/pq" $ smpTest $ \a b c -> test (a, IKPQOff) (b, PQSupportOn) (c, PQSupportOn)
+  it "pq/dh/dh" $ smpTest $ \a b c -> test (a, IKPQOn) (b, PQSupportOff) (c, PQSupportOff)
+  it "pq/dh/pq" $ smpTest $ \a b c -> test (a, IKPQOn) (b, PQSupportOff) (c, PQSupportOn)
+  it "pq/pq/dh" $ smpTest $ \a b c -> test (a, IKPQOn) (b, PQSupportOn) (c, PQSupportOff)
+  it "pq" $ smpTest $ \a b c -> test (a, IKPQOn) (b, PQSupportOn) (c, PQSupportOn)
+
+testDuplexConnection :: (HasCallStack, Transport c) => TProxy c -> c -> c -> IO ()
+testDuplexConnection _ alice bob = testDuplexConnection' (alice, IKPQOn) (bob, PQSupportOn)
+
+testDuplexConnection' :: (HasCallStack, Transport c) => (c, InitialKeys) -> (c, PQSupport) -> IO ()
+testDuplexConnection' (alice, aPQ) (bob, bPQ) = do
+  let pq = pqConnectionMode aPQ bPQ
+  ("1", "bob", Right (INV cReq)) <- alice #: ("1", "bob", "NEW T INV" <> pqConnModeStr aPQ <> " subscribe")
+  let cReq' = strEncode cReq
+  bob #: ("11", "alice", "JOIN T " <> cReq' <> enableKEMStr bPQ <> " subscribe 14\nbob's connInfo") #> ("11", "alice", OK)
+  ("", "bob", Right (A.CONF confId pqSup' _ "bob's connInfo")) <- (alice <#:)
+  pqSup' `shouldBe` CR.connPQEncryption aPQ
+  alice #: ("2", "bob", "LET " <> confId <> " 16\nalice's connInfo") #> ("2", "bob", OK)
+  bob <# ("", "alice", A.INFO bPQ "alice's connInfo")
+  bob <# ("", "alice", CON pq)
+  alice <# ("", "bob", CON pq)
+  -- message IDs 1 to 3 get assigned to control messages, so first MSG is assigned ID 4
+  alice #: ("3", "bob", "SEND F :hello") #> ("3", "bob", A.MID 4 pq)
+  alice <# ("", "bob", SENT 4)
+  bob <#= \case ("", "alice", Msg' 4 pq' "hello") -> pq == pq'; _ -> False
+  bob #: ("12", "alice", "ACK 4") #> ("12", "alice", OK)
+  alice #: ("4", "bob", "SEND F :how are you?") #> ("4", "bob", A.MID 5 pq)
+  alice <# ("", "bob", SENT 5)
+  bob <#= \case ("", "alice", Msg' 5 pq' "how are you?") -> pq == pq'; _ -> False
+  bob #: ("13", "alice", "ACK 5") #> ("13", "alice", OK)
+  bob #: ("14", "alice", "SEND F 9\nhello too") #> ("14", "alice", A.MID 6 pq)
+  bob <# ("", "alice", SENT 6)
+  alice <#= \case ("", "bob", Msg' 6 pq' "hello too") -> pq == pq'; _ -> False
+  alice #: ("3a", "bob", "ACK 6") #> ("3a", "bob", OK)
+  bob #: ("15", "alice", "SEND F 9\nmessage 1") #> ("15", "alice", A.MID 7 pq)
+  bob <# ("", "alice", SENT 7)
+  alice <#= \case ("", "bob", Msg' 7 pq' "message 1") -> pq == pq'; _ -> False
+  alice #: ("4a", "bob", "ACK 7") #> ("4a", "bob", OK)
+  alice #: ("5", "bob", "OFF") #> ("5", "bob", OK)
+  bob #: ("17", "alice", "SEND F 9\nmessage 3") #> ("17", "alice", A.MID 8 pq)
+  bob <# ("", "alice", MERR 8 (SMP AUTH))
+  alice #: ("6", "bob", "DEL") #> ("6", "bob", OK)
+  alice #:# "nothing else should be delivered to alice"
+
+testDuplexConnRandomIds :: (HasCallStack, Transport c) => TProxy c -> c -> c -> IO ()
+testDuplexConnRandomIds _ alice bob = testDuplexConnRandomIds' (alice, IKPQOn) (bob, PQSupportOn)
+
+testDuplexConnRandomIds' :: (HasCallStack, Transport c) => (c, InitialKeys) -> (c, PQSupport) -> IO ()
+testDuplexConnRandomIds' (alice, aPQ) (bob, bPQ) = do
+  let pq = pqConnectionMode aPQ bPQ
+  ("1", bobConn, Right (INV cReq)) <- alice #: ("1", "", "NEW T INV" <> pqConnModeStr aPQ <> " subscribe")
+  let cReq' = strEncode cReq
+  ("11", aliceConn, Right OK) <- bob #: ("11", "", "JOIN T " <> cReq' <> enableKEMStr bPQ <> " subscribe 14\nbob's connInfo")
+  ("", bobConn', Right (A.CONF confId pqSup' _ "bob's connInfo")) <- (alice <#:)
+  pqSup' `shouldBe` CR.connPQEncryption aPQ
+  bobConn' `shouldBe` bobConn
+  alice #: ("2", bobConn, "LET " <> confId <> " 16\nalice's connInfo") =#> \case ("2", c, OK) -> c == bobConn; _ -> False
+  bob <# ("", aliceConn, A.INFO bPQ "alice's connInfo")
+  bob <# ("", aliceConn, CON pq)
+  alice <# ("", bobConn, CON pq)
+  alice #: ("2", bobConn, "SEND F :hello") #> ("2", bobConn, A.MID 4 pq)
+  alice <# ("", bobConn, SENT 4)
+  bob <#= \case ("", c, Msg' 4 pq' "hello") -> c == aliceConn && pq == pq'; _ -> False
+  bob #: ("12", aliceConn, "ACK 4") #> ("12", aliceConn, OK)
+  alice #: ("3", bobConn, "SEND F :how are you?") #> ("3", bobConn, A.MID 5 pq)
+  alice <# ("", bobConn, SENT 5)
+  bob <#= \case ("", c, Msg' 5 pq' "how are you?") -> c == aliceConn && pq == pq'; _ -> False
+  bob #: ("13", aliceConn, "ACK 5") #> ("13", aliceConn, OK)
+  bob #: ("14", aliceConn, "SEND F 9\nhello too") #> ("14", aliceConn, A.MID 6 pq)
+  bob <# ("", aliceConn, SENT 6)
+  alice <#= \case ("", c, Msg' 6 pq' "hello too") -> c == bobConn && pq == pq'; _ -> False
+  alice #: ("3a", bobConn, "ACK 6") #> ("3a", bobConn, OK)
+  bob #: ("15", aliceConn, "SEND F 9\nmessage 1") #> ("15", aliceConn, A.MID 7 pq)
+  bob <# ("", aliceConn, SENT 7)
+  alice <#= \case ("", c, Msg' 7 pq' "message 1") -> c == bobConn && pq == pq'; _ -> False
+  alice #: ("4a", bobConn, "ACK 7") #> ("4a", bobConn, OK)
+  alice #: ("5", bobConn, "OFF") #> ("5", bobConn, OK)
+  bob #: ("17", aliceConn, "SEND F 9\nmessage 3") #> ("17", aliceConn, A.MID 8 pq)
+  bob <# ("", aliceConn, MERR 8 (SMP AUTH))
+  alice #: ("6", bobConn, "DEL") #> ("6", bobConn, OK)
+  alice #:# "nothing else should be delivered to alice"
+
+testContactConnection :: Transport c => (c, InitialKeys) -> (c, PQSupport) -> (c, PQSupport) -> IO ()
+testContactConnection (alice, aPQ) (bob, bPQ) (tom, tPQ) = do
+  ("1", "alice_contact", Right (INV cReq)) <- alice #: ("1", "alice_contact", "NEW T CON" <> pqConnModeStr aPQ <> " subscribe")
+  let cReq' = strEncode cReq
+      abPQ = pqConnectionMode aPQ bPQ
+      aPQMode = CR.connPQEncryption aPQ
+
+  bob #: ("11", "alice", "JOIN T " <> cReq' <> enableKEMStr bPQ <> " subscribe 14\nbob's connInfo") #> ("11", "alice", OK)
+  ("", "alice_contact", Right (A.REQ aInvId PQSupportOn _ "bob's connInfo")) <- (alice <#:)
+  alice #: ("2", "bob", "ACPT " <> aInvId <> enableKEMStr aPQMode <> " 16\nalice's connInfo") #> ("2", "bob", OK)
+  ("", "alice", Right (A.CONF bConfId pqSup'' _ "alice's connInfo")) <- (bob <#:)
+  pqSup'' `shouldBe` bPQ
+  bob #: ("12", "alice", "LET " <> bConfId <> " 16\nbob's connInfo 2") #> ("12", "alice", OK)
+  alice <# ("", "bob", A.INFO (CR.connPQEncryption aPQ) "bob's connInfo 2")
+  alice <# ("", "bob", CON abPQ)
+  bob <# ("", "alice", CON abPQ)
+  alice #: ("3", "bob", "SEND F :hi") #> ("3", "bob", A.MID 4 abPQ)
+  alice <# ("", "bob", SENT 4)
+  bob <#= \case ("", "alice", Msg' 4 pq' "hi") -> pq' == abPQ; _ -> False
+  bob #: ("13", "alice", "ACK 4") #> ("13", "alice", OK)
+
+  let atPQ = pqConnectionMode aPQ tPQ
+  tom #: ("21", "alice", "JOIN T " <> cReq' <> enableKEMStr tPQ <> " subscribe 14\ntom's connInfo") #> ("21", "alice", OK)
+  ("", "alice_contact", Right (A.REQ aInvId' PQSupportOn _ "tom's connInfo")) <- (alice <#:)
+  alice #: ("4", "tom", "ACPT " <> aInvId' <> enableKEMStr aPQMode <> " 16\nalice's connInfo") #> ("4", "tom", OK)
+  ("", "alice", Right (A.CONF tConfId pqSup4 _ "alice's connInfo")) <- (tom <#:)
+  pqSup4 `shouldBe` tPQ
+  tom #: ("22", "alice", "LET " <> tConfId <> " 16\ntom's connInfo 2") #> ("22", "alice", OK)
+  alice <# ("", "tom", A.INFO (CR.connPQEncryption aPQ) "tom's connInfo 2")
+  alice <# ("", "tom", CON atPQ)
+  tom <# ("", "alice", CON atPQ)
+  alice #: ("5", "tom", "SEND F :hi there") #> ("5", "tom", A.MID 4 atPQ)
+  alice <# ("", "tom", SENT 4)
+  tom <#= \case ("", "alice", Msg' 4 pq' "hi there") -> pq' == atPQ; _ -> False
+  tom #: ("23", "alice", "ACK 4") #> ("23", "alice", OK)
+
+testContactConnRandomIds :: Transport c => (c, InitialKeys) -> (c, PQSupport) -> IO ()
+testContactConnRandomIds (alice, aPQ) (bob, bPQ) = do
+  let pq = pqConnectionMode aPQ bPQ
+  ("1", aliceContact, Right (INV cReq)) <- alice #: ("1", "", "NEW T CON" <> pqConnModeStr aPQ <> " subscribe")
+  let cReq' = strEncode cReq
+
+  ("11", aliceConn, Right OK) <- bob #: ("11", "", "JOIN T " <> cReq' <> enableKEMStr bPQ <> " subscribe 14\nbob's connInfo")
+  ("", aliceContact', Right (A.REQ aInvId PQSupportOn _ "bob's connInfo")) <- (alice <#:)
+  aliceContact' `shouldBe` aliceContact
+
+  ("2", bobConn, Right OK) <- alice #: ("2", "", "ACPT " <> aInvId <> enableKEMStr (CR.connPQEncryption aPQ) <> " 16\nalice's connInfo")
+  ("", aliceConn', Right (A.CONF bConfId pqSup'' _ "alice's connInfo")) <- (bob <#:)
+  pqSup'' `shouldBe` bPQ
+  aliceConn' `shouldBe` aliceConn
+
+  bob #: ("12", aliceConn, "LET " <> bConfId <> " 16\nbob's connInfo 2") #> ("12", aliceConn, OK)
+  alice <# ("", bobConn, A.INFO (CR.connPQEncryption aPQ) "bob's connInfo 2")
+  alice <# ("", bobConn, CON pq)
+  bob <# ("", aliceConn, CON pq)
+
+  alice #: ("3", bobConn, "SEND F :hi") #> ("3", bobConn, A.MID 4 pq)
+  alice <# ("", bobConn, SENT 4)
+  bob <#= \case ("", c, Msg' 4 pq' "hi") -> c == aliceConn && pq == pq'; _ -> False
+  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 T CON subscribe")
+  let cReq' = strEncode cReq
+  bob #: ("11", "alice", "JOIN T " <> cReq' <> " subscribe 10\nbob's info") #> ("11", "alice", OK)
+  ("", "a_contact", Right (A.REQ aInvId PQSupportOn _ "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)
+  alice #: ("3", "bob", "ACPT " <> aInvId <> " 12\nalice's info") #> ("3", "bob", ERR $ A.CMD PROHIBITED)
+  bob #:# "nothing should be delivered to bob"
+
+testSubscription :: Transport c => TProxy c -> c -> c -> c -> IO ()
+testSubscription _ alice1 alice2 bob = do
+  (alice1, "alice") `connect` (bob, "bob")
+  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 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 5") #> ("2", "bob", OK)
+  alice2 #: ("21", "bob", "SUB") #> ("21", "bob", OK)
+  alice1 <# ("", "bob", END)
+  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 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 T INV subscribe") =#> \case ("1", "conn1", INV {}) -> True; _ -> False
+  client #:# "nothing should be delivered to client before the server is killed"
+  killThread server
+  client <#. ("", "", DOWN testSMPServer ["conn1"])
+  withSmpServer (ATransport t) $
+    client <# ("", "conn1", ERR (SMP AUTH)) -- this new server does not have the queue
+
+testMsgDeliveryServerRestart :: forall c. Transport c => (c, InitialKeys) -> (c, PQSupport) -> IO ()
+testMsgDeliveryServerRestart (alice, aPQ) (bob, bPQ) = do
+  let pq = pqConnectionMode aPQ bPQ
+  withServer $ do
+    connect' (alice, "alice", aPQ) (bob, "bob", bPQ)
+    bob #: ("1", "alice", "SEND F 2\nhi") #> ("1", "alice", A.MID 4 pq)
+    bob <# ("", "alice", SENT 4)
+    alice <#= \case ("", "bob", Msg' _ pq' "hi") -> pq == pq'; _ -> False
+    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 F 11\nhello again") #> ("2", "alice", A.MID 5 pq)
+  bob #:# "nothing else delivered before the server is restarted"
+  alice #:# "nothing else delivered before the server is restarted"
+
+  withServer $ do
+    bob <# ("", "alice", SENT 5)
+    alice <#. ("", "", UP server ["bob"])
+    alice <#= \case ("", "bob", Msg' _ pq' "hello again") -> pq == pq'; _ -> False
+    alice #: ("12", "bob", "ACK 5") #> ("12", "bob", OK)
+
+  removeFile testStoreLogFile
+  where
+    withServer test' = withSmpServerStoreLogOn (transport @c) testPort2 (const test') `shouldReturn` ()
+
+testServerConnectionAfterError :: forall c. Transport c => TProxy c -> [c] -> IO ()
+testServerConnectionAfterError t _ = do
+  withAgent1 $ \bob -> do
+    withAgent2 $ \alice -> do
+      withServer $ do
+        connect (bob, "bob") (alice, "alice")
+      bob <#. ("", "", DOWN server ["alice"])
+      alice <#. ("", "", DOWN server ["bob"])
+      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 _ e)) -> e == NETWORK || e == TIMEOUT
+      alice #: ("1", "bob", "SUB") =#> \("1", "bob", ERR (BROKER _ e)) -> e == NETWORK || e == TIMEOUT
+      withServer $ do
+        alice <#=? \case ("", "bob", APC _ (SENT 4)) -> True; ("", "", APC _ (UP s ["bob"])) -> s == server; _ -> False
+        alice <#=? \case ("", "bob", APC _ (SENT 4)) -> True; ("", "", APC _ (UP s ["bob"])) -> s == server; _ -> False
+        bob <#=? \case ("", "alice", APC _ (Msg "hello")) -> True; ("", "", APC _ (UP s ["alice"])) -> s == server; _ -> False
+        bob <#=? \case ("", "alice", APC _ (Msg "hello")) -> True; ("", "", APC _ (UP s ["alice"])) -> s == server; _ -> False
+        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
+  where
+    server = SMPServer "localhost" testPort2 testKeyHash
+    withServer test' = withSmpServerStoreLogOn (ATransport t) testPort2 (const test') `shouldReturn` ()
+    withAgent1 = withAgent agentTestPort testDB 0
+    withAgent2 = withAgent agentTestPort2 testDB2 10
+    withAgent :: String -> FilePath -> Int -> (c -> IO a) -> IO a
+    withAgent agentPort agentDB initClientId = withSmpAgentThreadOn_ (ATransport t) (agentPort, testPort2, agentDB) initClientId (pure ()) . const . testSMPAgentClientOn agentPort
+
+testMsgDeliveryAgentRestart :: Transport c => TProxy c -> c -> IO ()
+testMsgDeliveryAgentRestart t bob = do
+  let server = SMPServer "localhost" testPort2 testKeyHash
+  withAgent $ \alice -> do
+    withServer $ do
+      connect (bob, "bob") (alice, "alice")
+      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 4") #> ("11", "alice", OK)
+      bob #:# "nothing else delivered before the server is down"
+
+    bob <#. ("", "", DOWN server ["alice"])
+    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"
+
+  withAgent $ \alice -> do
+    withServer $ do
+      tPutRaw alice ("3", "bob", "SUB")
+      alice <#= \case
+        (corrId, "bob", cmd) ->
+          (corrId == "3" && cmd == OK)
+            || (corrId == "" && cmd == SENT 5)
+        _ -> False
+      bob <#=? \case ("", "alice", APC _ (Msg "hello again")) -> True; ("", "", APC _ (UP s ["alice"])) -> s == server; _ -> False
+      bob <#=? \case ("", "alice", APC _ (Msg "hello again")) -> True; ("", "", APC _ (UP s ["alice"])) -> s == server; _ -> False
+      bob #: ("12", "alice", "ACK 5") #> ("12", "alice", OK)
+
+  removeFile testStoreLogFile
+  removeFile testDB
+  where
+    withServer test' = withSmpServerStoreLogOn (ATransport t) testPort2 (const test') `shouldReturn` ()
+    withAgent = withSmpAgentThreadOn_ (ATransport t) (agentTestPort, testPort, testDB) 0 (pure ()) . const . testSMPAgentClientOn agentTestPort
+
+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 T INV subscribe")
+  let cReq' = strEncode cReq
+  bob #: ("11", "alice2", "JOIN T " <> cReq' <> " subscribe 14\nbob's connInfo") #> ("11", "alice2", OK)
+  ("", "bob2", Right (A.CONF _confId PQSupportOff _ "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")
+  -- bob <# ("", "alice", CON)
+  -- alice <# ("", "bob", CON)
+
+  -- the first connection should not be blocked by the second one
+  sendMessage (alice, "alice") (bob, "bob") "hello"
+  -- 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 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 5") #> ("3", "bob", OK)
+
+testMsgDeliveryQuotaExceeded :: Transport c => TProxy c -> c -> c -> IO ()
+testMsgDeliveryQuotaExceeded _ alice bob = do
+  connect (alice, "alice") (bob, "bob")
+  connect (alice, "alice2") (bob, "bob2")
+  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
+  (_, "bob", Right (MID _)) <- alice #: ("5", "bob", "SEND F :over quota")
+
+  alice #: ("1", "bob2", "SEND F :hello") #> ("1", "bob2", MID 4)
+  -- if delivery is blocked it won't go further
+  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)
+  inAnyOrder
+    (tGetAgent alice)
+    [ \case ("", c, Right (SENT 8)) -> c == "bob"; _ -> False,
+      \case ("", c, Right QCONT) -> c == "bob"; _ -> False
+    ]
+  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 :: Transport c => (c, ByteString) -> (c, ByteString) -> IO ()
+connect (h1, name1) (h2, name2) = connect' (h1, name1, IKPQOn) (h2, name2, PQSupportOn)
+
+connect' :: forall c. Transport c => (c, ByteString, InitialKeys) -> (c, ByteString, PQSupport) -> IO ()
+connect' (h1, name1, pqMode1) (h2, name2, pqMode2) = do
+  ("c1", _, Right (INV cReq)) <- h1 #: ("c1", name2, "NEW T INV" <> pqConnModeStr pqMode1 <> " subscribe")
+  let cReq' = strEncode cReq
+      pq = pqConnectionMode pqMode1 pqMode2
+  h2 #: ("c2", name1, "JOIN T " <> cReq' <> enableKEMStr pqMode2 <> " subscribe 5\ninfo2") #> ("c2", name1, OK)
+  ("", _, Right (A.CONF connId pqSup' _ "info2")) <- (h1 <#:)
+  pqSup' `shouldBe` CR.connPQEncryption pqMode1
+  h1 #: ("c3", name2, "LET " <> connId <> " 5\ninfo1") #> ("c3", name2, OK)
+  h2 <# ("", name1, A.INFO pqMode2 "info1")
+  h2 <# ("", name1, CON pq)
+  h1 <# ("", name2, CON pq)
+
+pqConnectionMode :: InitialKeys -> PQSupport -> PQEncryption
+pqConnectionMode pqMode1 pqMode2 = PQEncryption $ supportPQ (CR.connPQEncryption pqMode1) && supportPQ pqMode2
+
+enableKEMStr :: PQSupport -> ByteString
+enableKEMStr PQSupportOn = " " <> strEncode PQSupportOn
+enableKEMStr _ = ""
+
+pqConnModeStr :: InitialKeys -> ByteString
+pqConnModeStr (IKNoPQ PQSupportOff) = ""
+pqConnModeStr pq = " " <> strEncode pq
+
+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 F :" <> msg)
+  name2' `shouldBe` name2
+  h1 <#= \case ("", n, SENT m) -> n == name2 && m == mId; _ -> False
+  ("", 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 T INV subscribe")
+--   let cReq' = strEncode cReq
+--   ("c2", conn1, Right OK) <- h2 #: ("c2", "", "JOIN T " <> cReq' <> " subscribe 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)
+--   h1 <# ("", conn2, CON)
+--   pure (conn1, conn2)
+
+sampleDhKey :: ByteString
+sampleDhKey = "MCowBQYDK2VuAyEAjiswwI3O_NlS8Fk3HJUW870EY2bAwmttMBsvRB9eV3o="
+
+syntaxTests :: forall c. Transport c => TProxy c -> Spec
+syntaxTests t = do
+  it "unknown command" $ ("1", "5678", "HELLO") >#> ("1", "5678", "ERR CMD SYNTAX")
+  describe "NEW" $ do
+    describe "valid" $ do
+      it "with correct parameter" $ ("211", "", "NEW T INV subscribe") >#>= \case ("211", _, "INV" : _) -> True; _ -> False
+    describe "invalid" $ do
+      it "with incorrect parameter" $ ("222", "", "NEW T hi subscribe") >#> ("222", "", "ERR CMD SYNTAX")
+
+  describe "JOIN" $ do
+    describe "valid" $ do
+      it "using same server as in invitation" $
+        ( "311",
+          "a",
+          "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
+            <> "&v=2"
+            <> "&e2e=v%3D2%26x3dh%3DMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D%2CMEIwBQYDK2VvAzkAmKuSYeQ_m0SixPDS8Wq8VBaTS1cW-Lp0n0h4Diu-kUpR-qXx4SDJ32YGEFoGFGSbGPry5Ychr6U%3D"
+            <> " subscribe "
+            <> "14\nbob's connInfo"
+        )
+          >#> ("311", "a", "ERR SMP AUTH")
+    describe "invalid" $ do
+      it "no parameters" $ ("321", "", "JOIN") >#> ("321", "", "ERR CMD SYNTAX")
+  where
+    -- simple test for one command with the expected response
+    (>#>) :: ARawTransmission -> ARawTransmission -> Expectation
+    command >#> response = withFrozenCallStack $ smpAgentTest t command `shouldReturn` response
+
+    -- simple test for one command with a predicate for the expected response
+    (>#>=) :: ARawTransmission -> ((ByteString, ByteString, [ByteString]) -> Bool) -> Expectation
+    command >#>= p = withFrozenCallStack $ smpAgentTest t command >>= (`shouldSatisfy` p . \(cId, connId, cmd) -> (cId, connId, B.words cmd))
--- a/Show More
+++ b/Show More