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MeshCore/examples/simple_room_server/main.cpp

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#include <Arduino.h> // needed for PlatformIO
#include <Mesh.h>
#if defined(NRF52_PLATFORM)
#include <InternalFileSystem.h>
#elif defined(RP2040_PLATFORM)
#include <LittleFS.h>
#elif defined(ESP32)
#include <SPIFFS.h>
#endif
#include <helpers/ArduinoHelpers.h>
#include <helpers/StaticPoolPacketManager.h>
#include <helpers/SimpleMeshTables.h>
#include <helpers/IdentityStore.h>
#include <helpers/AdvertDataHelpers.h>
#include <helpers/TxtDataHelpers.h>
#include <helpers/CommonCLI.h>
#include <RTClib.h>
#include <target.h>
/* ------------------------------ Config -------------------------------- */
#ifndef FIRMWARE_BUILD_DATE
#define FIRMWARE_BUILD_DATE "24 Jul 2025"
#endif
#ifndef FIRMWARE_VERSION
#define FIRMWARE_VERSION "v1.7.4"
#endif
#ifndef LORA_FREQ
#define LORA_FREQ 915.0
#endif
#ifndef LORA_BW
#define LORA_BW 250
#endif
#ifndef LORA_SF
#define LORA_SF 10
#endif
#ifndef LORA_CR
#define LORA_CR 5
#endif
#ifndef LORA_TX_POWER
#define LORA_TX_POWER 20
#endif
#ifndef ADVERT_NAME
#define ADVERT_NAME "Test BBS"
#endif
#ifndef ADVERT_LAT
#define ADVERT_LAT 0.0
#endif
#ifndef ADVERT_LON
#define ADVERT_LON 0.0
#endif
#ifndef ADMIN_PASSWORD
#define ADMIN_PASSWORD "password"
#endif
#ifndef MAX_CLIENTS
#define MAX_CLIENTS 32
#endif
#ifndef MAX_UNSYNCED_POSTS
#define MAX_UNSYNCED_POSTS 32
#endif
#ifndef SERVER_RESPONSE_DELAY
#define SERVER_RESPONSE_DELAY 300
#endif
#ifndef TXT_ACK_DELAY
#define TXT_ACK_DELAY 200
#endif
#ifdef DISPLAY_CLASS
#include "UITask.h"
static UITask ui_task(display);
#endif
#define FIRMWARE_ROLE "room_server"
#define PACKET_LOG_FILE "/packet_log"
/* ------------------------------ Code -------------------------------- */
enum RoomPermission {
ADMIN,
GUEST,
READ_ONLY
};
struct ClientInfo {
mesh::Identity id;
uint32_t last_timestamp; // by THEIR clock
uint32_t last_activity; // by OUR clock
uint32_t sync_since; // sync messages SINCE this timestamp (by OUR clock)
uint32_t pending_ack;
uint32_t push_post_timestamp;
unsigned long ack_timeout;
RoomPermission permission;
uint8_t push_failures;
uint8_t secret[PUB_KEY_SIZE];
int out_path_len;
uint8_t out_path[MAX_PATH_SIZE];
};
#define MAX_POST_TEXT_LEN (160-9)
struct PostInfo {
mesh::Identity author;
uint32_t post_timestamp; // by OUR clock
char text[MAX_POST_TEXT_LEN+1];
};
#define REPLY_DELAY_MILLIS 1500
#define PUSH_NOTIFY_DELAY_MILLIS 2000
#define SYNC_PUSH_INTERVAL 1200
#define PUSH_ACK_TIMEOUT_FLOOD 12000
#define PUSH_TIMEOUT_BASE 4000
#define PUSH_ACK_TIMEOUT_FACTOR 2000
#define POST_SYNC_DELAY_SECS 6
#define CLIENT_KEEP_ALIVE_SECS 0 // Now Disabled (was 128)
#define REQ_TYPE_GET_STATUS 0x01 // same as _GET_STATS
#define REQ_TYPE_KEEP_ALIVE 0x02
#define REQ_TYPE_GET_TELEMETRY_DATA 0x03
#define RESP_SERVER_LOGIN_OK 0 // response to ANON_REQ
struct ServerStats {
uint16_t batt_milli_volts;
uint16_t curr_tx_queue_len;
int16_t noise_floor;
int16_t last_rssi;
uint32_t n_packets_recv;
uint32_t n_packets_sent;
uint32_t total_air_time_secs;
uint32_t total_up_time_secs;
uint32_t n_sent_flood, n_sent_direct;
uint32_t n_recv_flood, n_recv_direct;
uint16_t err_events; // was 'n_full_events'
int16_t last_snr; // x 4
uint16_t n_direct_dups, n_flood_dups;
uint16_t n_posted, n_post_push;
};
class MyMesh : public mesh::Mesh, public CommonCLICallbacks {
FILESYSTEM* _fs;
unsigned long next_local_advert, next_flood_advert;
bool _logging;
NodePrefs _prefs;
CommonCLI _cli;
uint8_t reply_data[MAX_PACKET_PAYLOAD];
int num_clients;
ClientInfo known_clients[MAX_CLIENTS];
unsigned long next_push;
uint16_t _num_posted, _num_post_pushes;
int next_client_idx; // for round-robin polling
int next_post_idx;
PostInfo posts[MAX_UNSYNCED_POSTS]; // cyclic queue
CayenneLPP telemetry;
unsigned long set_radio_at, revert_radio_at;
float pending_freq;
float pending_bw;
uint8_t pending_sf;
uint8_t pending_cr;
ClientInfo* putClient(const mesh::Identity& id) {
for (int i = 0; i < num_clients; i++) {
if (id.matches(known_clients[i].id)) return &known_clients[i]; // already known
}
ClientInfo* newClient;
if (num_clients < MAX_CLIENTS) {
newClient = &known_clients[num_clients++];
} else { // table is currently full
// evict least active client
uint32_t oldest_timestamp = 0xFFFFFFFF;
newClient = &known_clients[0];
for (int i = 0; i < num_clients; i++) {
auto c = &known_clients[i];
if (c->last_activity < oldest_timestamp) {
oldest_timestamp = c->last_activity;
newClient = c;
}
}
}
newClient->id = id;
newClient->out_path_len = -1; // initially out_path is unknown
newClient->last_timestamp = 0;
return newClient;
}
void evict(ClientInfo* client) {
client->last_activity = 0; // this slot will now be re-used (will be oldest)
memset(client->id.pub_key, 0, sizeof(client->id.pub_key));
memset(client->secret, 0, sizeof(client->secret));
client->pending_ack = 0;
}
void addPost(ClientInfo* client, const char* postData) {
// TODO: suggested postData format: <title>/<descrption>
posts[next_post_idx].author = client->id; // add to cyclic queue
StrHelper::strncpy(posts[next_post_idx].text, postData, MAX_POST_TEXT_LEN);
posts[next_post_idx].post_timestamp = getRTCClock()->getCurrentTimeUnique();
next_post_idx = (next_post_idx + 1) % MAX_UNSYNCED_POSTS;
next_push = futureMillis(PUSH_NOTIFY_DELAY_MILLIS);
_num_posted++; // stats
}
void pushPostToClient(ClientInfo* client, PostInfo& post) {
int len = 0;
memcpy(&reply_data[len], &post.post_timestamp, 4); len += 4; // this is a PAST timestamp... but should be accepted by client
uint8_t attempt;
getRNG()->random(&attempt, 1); // need this for re-tries, so packet hash (and ACK) will be different
reply_data[len++] = (TXT_TYPE_SIGNED_PLAIN << 2) | (attempt & 3); // 'signed' plain text
// encode prefix of post.author.pub_key
memcpy(&reply_data[len], post.author.pub_key, 4); len += 4; // just first 4 bytes
int text_len = strlen(post.text);
memcpy(&reply_data[len], post.text, text_len); len += text_len;
// calc expected ACK reply
mesh::Utils::sha256((uint8_t *)&client->pending_ack, 4, reply_data, len, client->id.pub_key, PUB_KEY_SIZE);
client->push_post_timestamp = post.post_timestamp;
auto reply = createDatagram(PAYLOAD_TYPE_TXT_MSG, client->id, client->secret, reply_data, len);
if (reply) {
if (client->out_path_len < 0) {
sendFlood(reply);
client->ack_timeout = futureMillis(PUSH_ACK_TIMEOUT_FLOOD);
} else {
sendDirect(reply, client->out_path, client->out_path_len);
client->ack_timeout = futureMillis(PUSH_TIMEOUT_BASE + PUSH_ACK_TIMEOUT_FACTOR * (client->out_path_len + 1));
}
_num_post_pushes++; // stats
} else {
client->pending_ack = 0;
MESH_DEBUG_PRINTLN("Unable to push post to client");
}
}
uint8_t getUnsyncedCount(ClientInfo* client) {
uint8_t count = 0;
for (int k = 0; k < MAX_UNSYNCED_POSTS; k++) {
if (posts[k].post_timestamp > client->sync_since // is new post for this Client?
&& !posts[k].author.matches(client->id)) { // don't push posts to the author
count++;
}
}
return count;
}
bool processAck(const uint8_t *data) {
for (int i = 0; i < num_clients; i++) {
auto client = &known_clients[i];
if (client->pending_ack && memcmp(data, &client->pending_ack, 4) == 0) { // got an ACK from Client!
client->pending_ack = 0; // clear this, so next push can happen
client->push_failures = 0;
client->sync_since = client->push_post_timestamp; // advance Client's SINCE timestamp, to sync next post
return true;
}
}
return false;
}
mesh::Packet* createSelfAdvert() {
uint8_t app_data[MAX_ADVERT_DATA_SIZE];
uint8_t app_data_len;
{
AdvertDataBuilder builder(ADV_TYPE_ROOM, _prefs.node_name, _prefs.node_lat, _prefs.node_lon);
app_data_len = builder.encodeTo(app_data);
}
return createAdvert(self_id, app_data, app_data_len);
}
File openAppend(const char* fname) {
#if defined(NRF52_PLATFORM)
return _fs->open(fname, FILE_O_WRITE);
#elif defined(RP2040_PLATFORM)
return _fs->open(fname, "a");
#else
return _fs->open(fname, "a", true);
#endif
}
int handleRequest(ClientInfo* sender, uint32_t sender_timestamp, uint8_t* payload, size_t payload_len) {
// uint32_t now = getRTCClock()->getCurrentTimeUnique();
// memcpy(reply_data, &now, 4); // response packets always prefixed with timestamp
memcpy(reply_data, &sender_timestamp, 4); // reflect sender_timestamp back in response packet (kind of like a 'tag')
switch (payload[0]) {
case REQ_TYPE_GET_STATUS: {
ServerStats stats;
stats.batt_milli_volts = board.getBattMilliVolts();
stats.curr_tx_queue_len = _mgr->getOutboundCount(0xFFFFFFFF);
stats.noise_floor = (int16_t)_radio->getNoiseFloor();
stats.last_rssi = (int16_t) radio_driver.getLastRSSI();
stats.n_packets_recv = radio_driver.getPacketsRecv();
stats.n_packets_sent = radio_driver.getPacketsSent();
stats.total_air_time_secs = getTotalAirTime() / 1000;
stats.total_up_time_secs = _ms->getMillis() / 1000;
stats.n_sent_flood = getNumSentFlood();
stats.n_sent_direct = getNumSentDirect();
stats.n_recv_flood = getNumRecvFlood();
stats.n_recv_direct = getNumRecvDirect();
stats.err_events = _err_flags;
stats.last_snr = (int16_t)(radio_driver.getLastSNR() * 4);
stats.n_direct_dups = ((SimpleMeshTables *)getTables())->getNumDirectDups();
stats.n_flood_dups = ((SimpleMeshTables *)getTables())->getNumFloodDups();
stats.n_posted = _num_posted;
stats.n_post_push = _num_post_pushes;
memcpy(&reply_data[4], &stats, sizeof(stats));
return 4 + sizeof(stats);
}
case REQ_TYPE_GET_TELEMETRY_DATA: {
uint8_t perm_mask = ~(payload[1]); // NEW: first reserved byte (of 4), is now inverse mask to apply to permissions
telemetry.reset();
telemetry.addVoltage(TELEM_CHANNEL_SELF, (float)board.getBattMilliVolts() / 1000.0f);
// query other sensors -- target specific
sensors.querySensors((sender->permission == RoomPermission::ADMIN ? 0xFF : 0x00) & perm_mask, telemetry);
uint8_t tlen = telemetry.getSize();
memcpy(&reply_data[4], telemetry.getBuffer(), tlen);
return 4 + tlen; // reply_len
}
}
return 0; // unknown command
}
protected:
float getAirtimeBudgetFactor() const override {
return _prefs.airtime_factor;
}
void logRxRaw(float snr, float rssi, const uint8_t raw[], int len) override {
#if MESH_PACKET_LOGGING
Serial.print(getLogDateTime());
Serial.print(" RAW: ");
mesh::Utils::printHex(Serial, raw, len);
Serial.println();
#endif
}
void logRx(mesh::Packet* pkt, int len, float score) override {
if (_logging) {
File f = openAppend(PACKET_LOG_FILE);
if (f) {
f.print(getLogDateTime());
f.printf(": RX, len=%d (type=%d, route=%s, payload_len=%d) SNR=%d RSSI=%d score=%d",
len, pkt->getPayloadType(), pkt->isRouteDirect() ? "D" : "F", pkt->payload_len,
(int)_radio->getLastSNR(), (int)_radio->getLastRSSI(), (int)(score*1000));
if (pkt->getPayloadType() == PAYLOAD_TYPE_PATH || pkt->getPayloadType() == PAYLOAD_TYPE_REQ
|| pkt->getPayloadType() == PAYLOAD_TYPE_RESPONSE || pkt->getPayloadType() == PAYLOAD_TYPE_TXT_MSG) {
f.printf(" [%02X -> %02X]\n", (uint32_t)pkt->payload[1], (uint32_t)pkt->payload[0]);
} else {
f.printf("\n");
}
f.close();
}
}
}
void logTx(mesh::Packet* pkt, int len) override {
if (_logging) {
File f = openAppend(PACKET_LOG_FILE);
if (f) {
f.print(getLogDateTime());
f.printf(": TX, len=%d (type=%d, route=%s, payload_len=%d)",
len, pkt->getPayloadType(), pkt->isRouteDirect() ? "D" : "F", pkt->payload_len);
if (pkt->getPayloadType() == PAYLOAD_TYPE_PATH || pkt->getPayloadType() == PAYLOAD_TYPE_REQ
|| pkt->getPayloadType() == PAYLOAD_TYPE_RESPONSE || pkt->getPayloadType() == PAYLOAD_TYPE_TXT_MSG) {
f.printf(" [%02X -> %02X]\n", (uint32_t)pkt->payload[1], (uint32_t)pkt->payload[0]);
} else {
f.printf("\n");
}
f.close();
}
}
}
void logTxFail(mesh::Packet* pkt, int len) override {
if (_logging) {
File f = openAppend(PACKET_LOG_FILE);
if (f) {
f.print(getLogDateTime());
f.printf(": TX FAIL!, len=%d (type=%d, route=%s, payload_len=%d)\n",
len, pkt->getPayloadType(), pkt->isRouteDirect() ? "D" : "F", pkt->payload_len);
f.close();
}
}
}
int calcRxDelay(float score, uint32_t air_time) const override {
if (_prefs.rx_delay_base <= 0.0f) return 0;
return (int) ((pow(_prefs.rx_delay_base, 0.85f - score) - 1.0) * air_time);
}
const char* getLogDateTime() override {
static char tmp[32];
uint32_t now = getRTCClock()->getCurrentTime();
DateTime dt = DateTime(now);
sprintf(tmp, "%02d:%02d:%02d - %d/%d/%d U", dt.hour(), dt.minute(), dt.second(), dt.day(), dt.month(), dt.year());
return tmp;
}
uint32_t getRetransmitDelay(const mesh::Packet* packet) override {
uint32_t t = (_radio->getEstAirtimeFor(packet->path_len + packet->payload_len + 2) * _prefs.tx_delay_factor);
return getRNG()->nextInt(0, 6)*t;
}
uint32_t getDirectRetransmitDelay(const mesh::Packet* packet) override {
uint32_t t = (_radio->getEstAirtimeFor(packet->path_len + packet->payload_len + 2) * _prefs.direct_tx_delay_factor);
return getRNG()->nextInt(0, 6)*t;
}
int getInterferenceThreshold() const override {
return _prefs.interference_threshold;
}
int getAGCResetInterval() const override {
return ((int)_prefs.agc_reset_interval) * 4000; // milliseconds
}
uint8_t getExtraAckTransmitCount() const override {
return _prefs.multi_acks;
}
bool allowPacketForward(const mesh::Packet* packet) override {
if (_prefs.disable_fwd) return false;
if (packet->isRouteFlood() && packet->path_len >= _prefs.flood_max) return false;
return true;
}
void onAnonDataRecv(mesh::Packet* packet, const uint8_t* secret, const mesh::Identity& sender, uint8_t* data, size_t len) override {
if (packet->getPayloadType() == PAYLOAD_TYPE_ANON_REQ) { // received an initial request by a possible admin client (unknown at this stage)
uint32_t sender_timestamp, sender_sync_since;
memcpy(&sender_timestamp, data, 4);
memcpy(&sender_sync_since, &data[4], 4); // sender's "sync messags SINCE x" timestamp
RoomPermission perm;
data[len] = 0; // ensure null terminator
if (strcmp((char *) &data[8], _prefs.password) == 0) { // check for valid admin password
perm = RoomPermission::ADMIN;
} else {
if (strcmp((char *) &data[8], _prefs.guest_password) == 0) { // check the room/public password
perm = RoomPermission::GUEST;
} else if (_prefs.allow_read_only) {
perm = RoomPermission::READ_ONLY;
} else {
MESH_DEBUG_PRINTLN("Incorrect room password");
return; // no response. Client will timeout
}
}
auto client = putClient(sender); // add to known clients (if not already known)
if (sender_timestamp <= client->last_timestamp) {
MESH_DEBUG_PRINTLN("possible replay attack!");
return;
}
MESH_DEBUG_PRINTLN("Login success!");
client->permission = perm;
client->last_timestamp = sender_timestamp;
client->sync_since = sender_sync_since;
client->pending_ack = 0;
client->push_failures = 0;
memcpy(client->secret, secret, PUB_KEY_SIZE);
uint32_t now = getRTCClock()->getCurrentTime();
client->last_activity = now;
now = getRTCClock()->getCurrentTimeUnique();
memcpy(reply_data, &now, 4); // response packets always prefixed with timestamp
// TODO: maybe reply with count of messages waiting to be synced for THIS client?
reply_data[4] = RESP_SERVER_LOGIN_OK;
reply_data[5] = (CLIENT_KEEP_ALIVE_SECS >> 4); // NEW: recommended keep-alive interval (secs / 16)
reply_data[6] = (perm == RoomPermission::ADMIN ? 1 : (perm == RoomPermission::GUEST ? 0 : 2));
reply_data[7] = getUnsyncedCount(client); // NEW
memcpy(&reply_data[8], "OK", 2); // REVISIT: not really needed
next_push = futureMillis(PUSH_NOTIFY_DELAY_MILLIS); // delay next push, give RESPONSE packet time to arrive first
if (packet->isRouteFlood()) {
// let this sender know path TO here, so they can use sendDirect(), and ALSO encode the response
mesh::Packet* path = createPathReturn(sender, client->secret, packet->path, packet->path_len,
PAYLOAD_TYPE_RESPONSE, reply_data, 8 + 2);
if (path) sendFlood(path, SERVER_RESPONSE_DELAY);
} else {
mesh::Packet* reply = createDatagram(PAYLOAD_TYPE_RESPONSE, sender, client->secret, reply_data, 8 + 2);
if (reply) {
if (client->out_path_len >= 0) { // we have an out_path, so send DIRECT
sendDirect(reply, client->out_path, client->out_path_len, SERVER_RESPONSE_DELAY);
} else {
sendFlood(reply, SERVER_RESPONSE_DELAY);
}
}
}
}
}
int matching_peer_indexes[MAX_CLIENTS];
int searchPeersByHash(const uint8_t* hash) override {
int n = 0;
for (int i = 0; i < num_clients; i++) {
if (known_clients[i].id.isHashMatch(hash)) {
matching_peer_indexes[n++] = i; // store the INDEXES of matching contacts (for subsequent 'peer' methods)
}
}
return n;
}
void getPeerSharedSecret(uint8_t* dest_secret, int peer_idx) override {
int i = matching_peer_indexes[peer_idx];
if (i >= 0 && i < num_clients) {
// lookup pre-calculated shared_secret
memcpy(dest_secret, known_clients[i].secret, PUB_KEY_SIZE);
} else {
MESH_DEBUG_PRINTLN("getPeerSharedSecret: Invalid peer idx: %d", i);
}
}
void onPeerDataRecv(mesh::Packet* packet, uint8_t type, int sender_idx, const uint8_t* secret, uint8_t* data, size_t len) override {
int i = matching_peer_indexes[sender_idx];
if (i < 0 || i >= num_clients) { // get from our known_clients table (sender SHOULD already be known in this context)
MESH_DEBUG_PRINTLN("onPeerDataRecv: invalid peer idx: %d", i);
return;
}
auto client = &known_clients[i];
if (type == PAYLOAD_TYPE_TXT_MSG && len > 5) { // a CLI command or new Post
uint32_t sender_timestamp;
memcpy(&sender_timestamp, data, 4); // timestamp (by sender's RTC clock - which could be wrong)
uint flags = (data[4] >> 2); // message attempt number, and other flags
if (!(flags == TXT_TYPE_PLAIN || flags == TXT_TYPE_CLI_DATA)) {
MESH_DEBUG_PRINTLN("onPeerDataRecv: unsupported command flags received: flags=%02x", (uint32_t)flags);
} else if (sender_timestamp >= client->last_timestamp) { // prevent replay attacks, but send Acks for retries
bool is_retry = (sender_timestamp == client->last_timestamp);
client->last_timestamp = sender_timestamp;
uint32_t now = getRTCClock()->getCurrentTimeUnique();
client->last_activity = now;
client->push_failures = 0; // reset so push can resume (if prev failed)
// len can be > original length, but 'text' will be padded with zeroes
data[len] = 0; // need to make a C string again, with null terminator
uint32_t ack_hash; // calc truncated hash of the message timestamp + text + sender pub_key, to prove to sender that we got it
mesh::Utils::sha256((uint8_t *) &ack_hash, 4, data, 5 + strlen((char *)&data[5]), client->id.pub_key, PUB_KEY_SIZE);
uint8_t temp[166];
bool send_ack;
if (flags == TXT_TYPE_CLI_DATA) {
if (client->permission == RoomPermission::ADMIN) {
if (is_retry) {
temp[5] = 0; // no reply
} else {
handleCommand(sender_timestamp, (char *) &data[5], (char *) &temp[5]);
temp[4] = (TXT_TYPE_CLI_DATA << 2); // attempt and flags, (NOTE: legacy was: TXT_TYPE_PLAIN)
}
send_ack = false;
} else {
temp[5] = 0; // no reply
send_ack = false; // and no ACK... user shoudn't be sending these
}
} else { // TXT_TYPE_PLAIN
if (client->permission == RoomPermission::READ_ONLY) {
temp[5] = 0; // no reply
send_ack = false; // no ACK
} else {
if (!is_retry) {
addPost(client, (const char *) &data[5]);
}
temp[5] = 0; // no reply (ACK is enough)
send_ack = true;
}
}
uint32_t delay_millis;
if (send_ack) {
if (client->out_path_len < 0) {
mesh::Packet* ack = createAck(ack_hash);
if (ack) sendFlood(ack, TXT_ACK_DELAY);
delay_millis = TXT_ACK_DELAY + REPLY_DELAY_MILLIS;
} else {
uint32_t d = TXT_ACK_DELAY;
if (getExtraAckTransmitCount() > 0) {
mesh::Packet* a1 = createMultiAck(ack_hash, 1);
if (a1) sendDirect(a1, client->out_path, client->out_path_len, d);
d += 300;
}
mesh::Packet* a2 = createAck(ack_hash);
if (a2) sendDirect(a2, client->out_path, client->out_path_len, d);
delay_millis = d + REPLY_DELAY_MILLIS;
}
} else {
delay_millis = 0;
}
int text_len = strlen((char *) &temp[5]);
if (text_len > 0) {
if (now == sender_timestamp) {
// WORKAROUND: the two timestamps need to be different, in the CLI view
now++;
}
memcpy(temp, &now, 4); // mostly an extra blob to help make packet_hash unique
// calc expected ACK reply
//mesh::Utils::sha256((uint8_t *)&expected_ack_crc, 4, temp, 5 + text_len, self_id.pub_key, PUB_KEY_SIZE);
auto reply = createDatagram(PAYLOAD_TYPE_TXT_MSG, client->id, secret, temp, 5 + text_len);
if (reply) {
if (client->out_path_len < 0) {
sendFlood(reply, delay_millis + SERVER_RESPONSE_DELAY);
} else {
sendDirect(reply, client->out_path, client->out_path_len, delay_millis + SERVER_RESPONSE_DELAY);
}
}
}
} else {
MESH_DEBUG_PRINTLN("onPeerDataRecv: possible replay attack detected");
}
} else if (type == PAYLOAD_TYPE_REQ && len >= 5) {
uint32_t sender_timestamp;
memcpy(&sender_timestamp, data, 4); // timestamp (by sender's RTC clock - which could be wrong)
if (sender_timestamp < client->last_timestamp) { // prevent replay attacks
MESH_DEBUG_PRINTLN("onPeerDataRecv: possible replay attack detected");
} else {
client->last_timestamp = sender_timestamp;
uint32_t now = getRTCClock()->getCurrentTime();
client->last_activity = now; // <-- THIS will keep client connection alive
client->push_failures = 0; // reset so push can resume (if prev failed)
if (data[4] == REQ_TYPE_KEEP_ALIVE && packet->isRouteDirect()) { // request type
uint32_t forceSince = 0;
if (len >= 9) { // optional - last post_timestamp client received
memcpy(&forceSince, &data[5], 4); // NOTE: this may be 0, if part of decrypted PADDING!
} else {
memcpy(&data[5], &forceSince, 4); // make sure there are zeroes in payload (for ack_hash calc below)
}
if (forceSince > 0) {
client->sync_since = forceSince; // force-update the 'sync since'
}
client->pending_ack = 0;
// TODO: Throttle KEEP_ALIVE requests!
// if client sends too quickly, evict()
// RULE: only send keep_alive response DIRECT!
if (client->out_path_len >= 0) {
uint32_t ack_hash; // calc ACK to prove to sender that we got request
mesh::Utils::sha256((uint8_t *) &ack_hash, 4, data, 9, client->id.pub_key, PUB_KEY_SIZE);
auto reply = createAck(ack_hash);
if (reply) {
reply->payload[reply->payload_len++] = getUnsyncedCount(client); // NEW: add unsynced counter to end of ACK packet
sendDirect(reply, client->out_path, client->out_path_len, SERVER_RESPONSE_DELAY);
}
}
} else {
int reply_len = handleRequest(client, sender_timestamp, &data[4], len - 4);
if (reply_len > 0) { // valid command
if (packet->isRouteFlood()) {
// let this sender know path TO here, so they can use sendDirect(), and ALSO encode the response
mesh::Packet* path = createPathReturn(client->id, secret, packet->path, packet->path_len,
PAYLOAD_TYPE_RESPONSE, reply_data, reply_len);
if (path) sendFlood(path, SERVER_RESPONSE_DELAY);
} else {
mesh::Packet* reply = createDatagram(PAYLOAD_TYPE_RESPONSE, client->id, secret, reply_data, reply_len);
if (reply) {
if (client->out_path_len >= 0) { // we have an out_path, so send DIRECT
sendDirect(reply, client->out_path, client->out_path_len, SERVER_RESPONSE_DELAY);
} else {
sendFlood(reply, SERVER_RESPONSE_DELAY);
}
}
}
}
}
}
}
}
bool onPeerPathRecv(mesh::Packet* packet, int sender_idx, const uint8_t* secret, uint8_t* path, uint8_t path_len, uint8_t extra_type, uint8_t* extra, uint8_t extra_len) override {
// TODO: prevent replay attacks
int i = matching_peer_indexes[sender_idx];
if (i >= 0 && i < num_clients) { // get from our known_clients table (sender SHOULD already be known in this context)
MESH_DEBUG_PRINTLN("PATH to client, path_len=%d", (uint32_t) path_len);
auto client = &known_clients[i];
memcpy(client->out_path, path, client->out_path_len = path_len); // store a copy of path, for sendDirect()
} else {
MESH_DEBUG_PRINTLN("onPeerPathRecv: invalid peer idx: %d", i);
}
if (extra_type == PAYLOAD_TYPE_ACK && extra_len >= 4) {
// also got an encoded ACK!
processAck(extra);
}
// NOTE: no reciprocal path send!!
return false;
}
void onAckRecv(mesh::Packet* packet, uint32_t ack_crc) override {
if (processAck((uint8_t *)&ack_crc)) {
packet->markDoNotRetransmit(); // ACK was for this node, so don't retransmit
}
}
public:
MyMesh(mesh::MainBoard& board, mesh::Radio& radio, mesh::MillisecondClock& ms, mesh::RNG& rng, mesh::RTCClock& rtc, mesh::MeshTables& tables)
: mesh::Mesh(radio, ms, rng, rtc, *new StaticPoolPacketManager(32), tables),
_cli(board, rtc, &_prefs, this), telemetry(MAX_PACKET_PAYLOAD - 4)
{
next_local_advert = next_flood_advert = 0;
_logging = false;
set_radio_at = revert_radio_at = 0;
// defaults
memset(&_prefs, 0, sizeof(_prefs));
_prefs.airtime_factor = 1.0; // one half
_prefs.rx_delay_base = 0.0f; // off by default, was 10.0
_prefs.tx_delay_factor = 0.5f; // was 0.25f;
StrHelper::strncpy(_prefs.node_name, ADVERT_NAME, sizeof(_prefs.node_name));
_prefs.node_lat = ADVERT_LAT;
_prefs.node_lon = ADVERT_LON;
StrHelper::strncpy(_prefs.password, ADMIN_PASSWORD, sizeof(_prefs.password));
_prefs.freq = LORA_FREQ;
_prefs.sf = LORA_SF;
_prefs.bw = LORA_BW;
_prefs.cr = LORA_CR;
_prefs.tx_power_dbm = LORA_TX_POWER;
_prefs.disable_fwd = 1;
_prefs.advert_interval = 1; // default to 2 minutes for NEW installs
_prefs.flood_advert_interval = 3; // 3 hours
_prefs.flood_max = 64;
_prefs.interference_threshold = 0; // disabled
#ifdef ROOM_PASSWORD
StrHelper::strncpy(_prefs.guest_password, ROOM_PASSWORD, sizeof(_prefs.guest_password));
#endif
num_clients = 0;
next_post_idx = 0;
next_client_idx = 0;
next_push = 0;
memset(posts, 0, sizeof(posts));
_num_posted = _num_post_pushes = 0;
}
void begin(FILESYSTEM* fs) {
mesh::Mesh::begin();
_fs = fs;
// load persisted prefs
_cli.loadPrefs(_fs);
radio_set_params(_prefs.freq, _prefs.bw, _prefs.sf, _prefs.cr);
radio_set_tx_power(_prefs.tx_power_dbm);
updateAdvertTimer();
updateFloodAdvertTimer();
}
const char* getFirmwareVer() override { return FIRMWARE_VERSION; }
const char* getBuildDate() override { return FIRMWARE_BUILD_DATE; }
const char* getRole() override { return FIRMWARE_ROLE; }
const char* getNodeName() { return _prefs.node_name; }
NodePrefs* getNodePrefs() {
return &_prefs;
}
void savePrefs() override {
_cli.savePrefs(_fs);
}
void applyTempRadioParams(float freq, float bw, uint8_t sf, uint8_t cr, int timeout_mins) override {
set_radio_at = futureMillis(2000); // give CLI reply some time to be sent back, before applying temp radio params
pending_freq = freq;
pending_bw = bw;
pending_sf = sf;
pending_cr = cr;
revert_radio_at = futureMillis(2000 + timeout_mins*60*1000); // schedule when to revert radio params
}
bool formatFileSystem() override {
#if defined(NRF52_PLATFORM)
return InternalFS.format();
#elif defined(RP2040_PLATFORM)
return LittleFS.format();
#elif defined(ESP32)
return SPIFFS.format();
#else
#error "need to implement file system erase"
return false;
#endif
}
void sendSelfAdvertisement(int delay_millis) override {
mesh::Packet* pkt = createSelfAdvert();
if (pkt) {
sendFlood(pkt, delay_millis);
} else {
MESH_DEBUG_PRINTLN("ERROR: unable to create advertisement packet!");
}
}
void updateAdvertTimer() override {
if (_prefs.advert_interval > 0) { // schedule local advert timer
next_local_advert = futureMillis((uint32_t)_prefs.advert_interval * 2 * 60 * 1000);
} else {
next_local_advert = 0; // stop the timer
}
}
void updateFloodAdvertTimer() override {
if (_prefs.flood_advert_interval > 0) { // schedule flood advert timer
next_flood_advert = futureMillis( ((uint32_t)_prefs.flood_advert_interval) * 60 * 60 * 1000);
} else {
next_flood_advert = 0; // stop the timer
}
}
void setLoggingOn(bool enable) override { _logging = enable; }
void eraseLogFile() override {
_fs->remove(PACKET_LOG_FILE);
}
void dumpLogFile() override {
#if defined(RP2040_PLATFORM)
File f = _fs->open(PACKET_LOG_FILE, "r");
#else
File f = _fs->open(PACKET_LOG_FILE);
#endif
if (f) {
while (f.available()) {
int c = f.read();
if (c < 0) break;
Serial.print((char)c);
}
f.close();
}
}
void setTxPower(uint8_t power_dbm) override {
radio_set_tx_power(power_dbm);
}
void formatNeighborsReply(char *reply) override {
strcpy(reply, "not supported");
}
const uint8_t* getSelfIdPubKey() override { return self_id.pub_key; }
void clearStats() override {
radio_driver.resetStats();
resetStats();
((SimpleMeshTables *)getTables())->resetStats();
}
void handleCommand(uint32_t sender_timestamp, char* command, char* reply) {
while (*command == ' ') command++; // skip leading spaces
if (strlen(command) > 4 && command[2] == '|') { // optional prefix (for companion radio CLI)
memcpy(reply, command, 3); // reflect the prefix back
reply += 3;
command += 3;
}
_cli.handleCommand(sender_timestamp, command, reply); // common CLI commands
}
void loop() {
mesh::Mesh::loop();
if (millisHasNowPassed(next_push) && num_clients > 0) {
// check for ACK timeouts
for (int i = 0; i < num_clients; i++) {
auto c = &known_clients[i];
if (c->pending_ack && millisHasNowPassed(c->ack_timeout)) {
c->push_failures++;
c->pending_ack = 0; // reset (TODO: keep prev expected_ack's in a list, incase they arrive LATER, after we retry)
MESH_DEBUG_PRINTLN("pending ACK timed out: push_failures: %d", (uint32_t)c->push_failures);
}
}
// check next Round-Robin client, and sync next new post
auto client = &known_clients[next_client_idx];
bool did_push = false;
if (client->pending_ack == 0 && client->last_activity != 0 && client->push_failures < 3) { // not already waiting for ACK, AND not evicted, AND retries not max
MESH_DEBUG_PRINTLN("loop - checking for client %02X", (uint32_t) client->id.pub_key[0]);
uint32_t now = getRTCClock()->getCurrentTime();
for (int k = 0, idx = next_post_idx; k < MAX_UNSYNCED_POSTS; k++) {
auto p = &posts[idx];
if (now >= p->post_timestamp + POST_SYNC_DELAY_SECS && p->post_timestamp > client->sync_since // is new post for this Client?
&& !p->author.matches(client->id)) { // don't push posts to the author
// push this post to Client, then wait for ACK
pushPostToClient(client, *p);
did_push = true;
MESH_DEBUG_PRINTLN("loop - pushed to client %02X: %s", (uint32_t) client->id.pub_key[0], p->text);
break;
}
idx = (idx + 1) % MAX_UNSYNCED_POSTS; // wrap to start of cyclic queue
}
} else {
MESH_DEBUG_PRINTLN("loop - skipping busy (or evicted) client %02X", (uint32_t) client->id.pub_key[0]);
}
next_client_idx = (next_client_idx + 1) % num_clients; // round robin polling for each client
if (did_push) {
next_push = futureMillis(SYNC_PUSH_INTERVAL);
} else {
// were no unsynced posts for curr client, so proccess next client much quicker! (in next loop())
next_push = futureMillis(SYNC_PUSH_INTERVAL / 8);
}
}
if (next_flood_advert && millisHasNowPassed(next_flood_advert)) {
mesh::Packet* pkt = createSelfAdvert();
if (pkt) sendFlood(pkt);
updateFloodAdvertTimer(); // schedule next flood advert
updateAdvertTimer(); // also schedule local advert (so they don't overlap)
} else if (next_local_advert && millisHasNowPassed(next_local_advert)) {
mesh::Packet* pkt = createSelfAdvert();
if (pkt) sendZeroHop(pkt);
updateAdvertTimer(); // schedule next local advert
}
if (set_radio_at && millisHasNowPassed(set_radio_at)) { // apply pending (temporary) radio params
set_radio_at = 0; // clear timer
radio_set_params(pending_freq, pending_bw, pending_sf, pending_cr);
MESH_DEBUG_PRINTLN("Temp radio params");
}
if (revert_radio_at && millisHasNowPassed(revert_radio_at)) { // revert radio params to orig
revert_radio_at = 0; // clear timer
radio_set_params(_prefs.freq, _prefs.bw, _prefs.sf, _prefs.cr);
MESH_DEBUG_PRINTLN("Radio params restored");
}
#ifdef DISPLAY_CLASS
ui_task.loop();
#endif
// TODO: periodically check for OLD/inactive entries in known_clients[], and evict
}
};
StdRNG fast_rng;
SimpleMeshTables tables;
MyMesh the_mesh(board, radio_driver, *new ArduinoMillis(), fast_rng, rtc_clock, tables);
void halt() {
while (1) ;
}
static char command[MAX_POST_TEXT_LEN+1];
void setup() {
Serial.begin(115200);
delay(1000);
board.begin();
#ifdef DISPLAY_CLASS
if (display.begin()) {
display.startFrame();
display.print("Please wait...");
display.endFrame();
}
#endif
if (!radio_init()) { halt(); }
fast_rng.begin(radio_get_rng_seed());
FILESYSTEM* fs;
#if defined(NRF52_PLATFORM)
InternalFS.begin();
fs = &InternalFS;
IdentityStore store(InternalFS, "");
#elif defined(RP2040_PLATFORM)
LittleFS.begin();
fs = &LittleFS;
IdentityStore store(LittleFS, "/identity");
store.begin();
#elif defined(ESP32)
SPIFFS.begin(true);
fs = &SPIFFS;
IdentityStore store(SPIFFS, "/identity");
#else
#error "need to define filesystem"
#endif
if (!store.load("_main", the_mesh.self_id)) {
the_mesh.self_id = radio_new_identity(); // create new random identity
int count = 0;
while (count < 10 && (the_mesh.self_id.pub_key[0] == 0x00 || the_mesh.self_id.pub_key[0] == 0xFF)) { // reserved id hashes
the_mesh.self_id = radio_new_identity(); count++;
}
store.save("_main", the_mesh.self_id);
}
Serial.print("Room ID: ");
mesh::Utils::printHex(Serial, the_mesh.self_id.pub_key, PUB_KEY_SIZE); Serial.println();
command[0] = 0;
sensors.begin();
the_mesh.begin(fs);
#ifdef DISPLAY_CLASS
ui_task.begin(the_mesh.getNodePrefs(), FIRMWARE_BUILD_DATE, FIRMWARE_VERSION);
#endif
// send out initial Advertisement to the mesh
the_mesh.sendSelfAdvertisement(16000);
}
void loop() {
int len = strlen(command);
while (Serial.available() && len < sizeof(command)-1) {
char c = Serial.read();
if (c != '\n') {
command[len++] = c;
command[len] = 0;
}
Serial.print(c);
}
if (len == sizeof(command)-1) { // command buffer full
command[sizeof(command)-1] = '\r';
}
if (len > 0 && command[len - 1] == '\r') { // received complete line
command[len - 1] = 0; // replace newline with C string null terminator
char reply[160];
the_mesh.handleCommand(0, command, reply); // NOTE: there is no sender_timestamp via serial!
if (reply[0]) {
Serial.print(" -> "); Serial.println(reply);
}
command[0] = 0; // reset command buffer
}
the_mesh.loop();
sensors.loop();
}
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