Merge branch 'dev'

examples/companion_radio/main.cpp

@@ -96,8 +96,15 @@ static uint32_t _atoi(const char* sp) {
 
 /*------------ Frame Protocol --------------*/
 
-#define FIRMWARE_VER_CODE    1
+#define FIRMWARE_VER_CODE    2
-#define FIRMWARE_BUILD_DATE   "19 Feb 2025"
+
+#ifndef FIRMWARE_BUILD_DATE
+  #define FIRMWARE_BUILD_DATE   "3 Mar 2025"
+#endif
+
+#ifndef FIRMWARE_VERSION
+  #define FIRMWARE_VERSION   "v1.0.0"
+#endif
 
 #define CMD_APP_START              1
 #define CMD_SEND_TXT_MSG           2
@@ -126,6 +133,8 @@ static uint32_t _atoi(const char* sp) {
 #define CMD_SEND_RAW_DATA         25
 #define CMD_SEND_LOGIN            26
 #define CMD_SEND_STATUS_REQ       27
+#define CMD_HAS_CONNECTION        28
+#define CMD_LOGOUT                29   // 'Disconnect'
 
 #define RESP_CODE_OK                0
 #define RESP_CODE_ERR               1
@@ -435,16 +444,19 @@ protected:
       expected_ack_crc = 0;  // reset our expected hash, now that we have received ACK
       return true;
     }
-    return false;
+    return checkConnectionsAck(data);
   }
 
-  void queueMessage(const ContactInfo& from, uint8_t txt_type, uint8_t path_len, uint32_t sender_timestamp, const char *text) {
+  void queueMessage(const ContactInfo& from, uint8_t txt_type, uint8_t path_len, uint32_t sender_timestamp, const uint8_t* extra, int extra_len, const char *text) {
     int i = 0;
     out_frame[i++] = RESP_CODE_CONTACT_MSG_RECV;
     memcpy(&out_frame[i], from.id.pub_key, 6); i += 6;  // just 6-byte prefix
     out_frame[i++] = path_len;
     out_frame[i++] = txt_type;
     memcpy(&out_frame[i], &sender_timestamp, 4); i += 4;
+    if (extra_len > 0) {
+      memcpy(&out_frame[i], extra, extra_len); i += extra_len;
+    }
     int tlen = strlen(text);   // TODO: UTF-8 ??
     if (i + tlen > MAX_FRAME_SIZE) {
       tlen = MAX_FRAME_SIZE - i;
@@ -462,11 +474,19 @@ protected:
   }
 
   void onMessageRecv(const ContactInfo& from, uint8_t path_len, uint32_t sender_timestamp, const char *text) override {
-    queueMessage(from, TXT_TYPE_PLAIN, path_len, sender_timestamp, text);
+    markConnectionActive(from);   // in case this is from a server, and we have a connection
+    queueMessage(from, TXT_TYPE_PLAIN, path_len, sender_timestamp, NULL, 0, text);
   }
 
   void onCommandDataRecv(const ContactInfo& from, uint8_t path_len, uint32_t sender_timestamp, const char *text) override {
-    queueMessage(from, TXT_TYPE_CLI_DATA, path_len, sender_timestamp, text);
+    markConnectionActive(from);   // in case this is from a server, and we have a connection
+    queueMessage(from, TXT_TYPE_CLI_DATA, path_len, sender_timestamp, NULL, 0, text);
+  }
+
+  void onSignedMessageRecv(const ContactInfo& from, uint8_t path_len, uint32_t sender_timestamp, const uint8_t *sender_prefix, const char *text) override {
+    markConnectionActive(from);
+    saveContacts();   // from.sync_since change needs to be persisted
+    queueMessage(from, TXT_TYPE_SIGNED_PLAIN, path_len, sender_timestamp, sender_prefix, 4, text);
   }
 
   void onChannelMessageRecv(const mesh::GroupChannel& channel, int in_path_len, uint32_t timestamp, const char *text) override {
@@ -505,7 +525,10 @@ protected:
         out_frame[i++] = PUSH_CODE_LOGIN_SUCCESS;
         out_frame[i++] = 0;  // legacy: is_admin = false
       } else if (data[4] == RESP_SERVER_LOGIN_OK) {   // new login response
-        //  keep_alive_interval  = data[5] * 16
+        uint16_t keep_alive_secs = ((uint16_t)data[5]) * 16;
+        if (keep_alive_secs > 0) {
+          startConnection(contact, keep_alive_secs);
+        }
         out_frame[i++] = PUSH_CODE_LOGIN_SUCCESS;
         out_frame[i++] = data[6];  // permissions (eg. is_admin)
       } else {
@@ -640,11 +663,9 @@ public:
       out_frame[i++] = FIRMWARE_VER_CODE;
       memset(&out_frame[i], 0, 6); i += 6;  // reserved
       memset(&out_frame[i], 0, 12);
-      strcpy((char *) &out_frame[i], FIRMWARE_BUILD_DATE);
+      strcpy((char *) &out_frame[i], FIRMWARE_BUILD_DATE); i += 12;
-      i += 12;
+      StrHelper::strzcpy((char *) &out_frame[i], board.getManufacturerName(), 40); i += 40;
-      const char* name = board.getManufacturerName();
+      StrHelper::strzcpy((char *) &out_frame[i], FIRMWARE_VERSION, 20); i += 20;
-      int tlen = strlen(name);
-      memcpy(&out_frame[i], name, tlen); i += tlen;
       _serial->writeFrame(out_frame, i);
     } else if (cmd_frame[0] == CMD_APP_START && len >= 8) {   // sent when app establishes connection, respond with node ID
       //  cmd_frame[1..7]  reserved future
@@ -1013,6 +1034,17 @@ public:
       } else {
         writeErrFrame();  // contact not found
       }
+    } else if (cmd_frame[0] == CMD_HAS_CONNECTION && len >= 1+PUB_KEY_SIZE) {
+      uint8_t* pub_key = &cmd_frame[1];
+      if (hasConnectionTo(pub_key)) {
+        writeOKFrame();
+      } else {
+        writeErrFrame();
+      }
+    } else if (cmd_frame[0] == CMD_LOGOUT && len >= 1+PUB_KEY_SIZE) {
+      uint8_t* pub_key = &cmd_frame[1];
+      stopConnection(pub_key);
+      writeOKFrame();
     } else {
       writeErrFrame();
       MESH_DEBUG_PRINTLN("ERROR: unknown command: %02X", cmd_frame[0]);
@@ -1042,6 +1074,8 @@ public:
         _serial->writeFrame(out_frame, 5);
         _iter_started = false;
       }
+    } else if (!_serial->isWriteBusy()) {
+      checkConnections();
     }
   }
 };

examples/simple_repeater/main.cpp

@@ -21,7 +21,13 @@
 
 /* ------------------------------ Config -------------------------------- */
 
-#define FIRMWARE_VER_TEXT   "v6 (build: 27 Feb 2025)"
+#ifndef FIRMWARE_BUILD_DATE
+  #define FIRMWARE_BUILD_DATE   "3 Mar 2025"
+#endif
+
+#ifndef FIRMWARE_VERSION
+  #define FIRMWARE_VERSION   "v1.0.0"
+#endif
 
 #ifndef LORA_FREQ
   #define LORA_FREQ   915.0
@@ -516,7 +522,8 @@ public:
     updateAdvertTimer();
   }
 
-  const char* getFirmwareVer() override { return FIRMWARE_VER_TEXT; }
+  const char* getFirmwareVer() override { return FIRMWARE_VERSION; }
+  const char* getBuildDate() override { return FIRMWARE_BUILD_DATE; }
 
   void savePrefs() override {
 #if defined(NRF52_PLATFORM)

examples/simple_room_server/main.cpp

@@ -21,7 +21,13 @@
 
 /* ------------------------------ Config -------------------------------- */
 
-#define FIRMWARE_VER_TEXT   "v6 (build: 27 Feb 2025)"
+#ifndef FIRMWARE_BUILD_DATE
+  #define FIRMWARE_BUILD_DATE   "3 Mar 2025"
+#endif
+
+#ifndef FIRMWARE_VERSION
+  #define FIRMWARE_VERSION   "v1.0.0"
+#endif
 
 #ifndef LORA_FREQ
   #define LORA_FREQ   915.0
@@ -117,7 +123,8 @@ struct PostInfo {
 
 #define CLIENT_KEEP_ALIVE_SECS   128
 
-#define REQ_TYPE_KEEP_ALIVE   1
+#define REQ_TYPE_GET_STATUS      0x01   // same as _GET_STATS
+#define REQ_TYPE_KEEP_ALIVE      0x02
 
 #define RESP_SERVER_LOGIN_OK      0   // response to ANON_REQ
 
@@ -305,7 +312,7 @@ protected:
       // 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] = 0;  // FUTURE: reserved
+      reply_data[6] = is_admin ? 1 : 0;
       reply_data[7] = 0;  // FUTURE: reserved
       memcpy(&reply_data[8], "OK", 2);  // REVISIT: not really needed
 
@@ -436,12 +443,11 @@ protected:
         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'
-          len = 9;   // for ACK hash calc below
-        } else {
-          len = 5;   // for ACK hash calc below
         }
 
         uint32_t now = getRTCClock()->getCurrentTime();
@@ -455,7 +461,7 @@ protected:
         // 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, len, client->id.pub_key, PUB_KEY_SIZE);
+          mesh::Utils::sha256((uint8_t *) &ack_hash, 4, data, 9, client->id.pub_key, PUB_KEY_SIZE);
 
           auto reply = createAck(ack_hash);
           if (reply) {
@@ -551,7 +557,8 @@ public:
     updateAdvertTimer();
   }
 
-  const char* getFirmwareVer() override { return FIRMWARE_VER_TEXT; }
+  const char* getFirmwareVer() override { return FIRMWARE_VERSION; }
+  const char* getBuildDate() override { return FIRMWARE_BUILD_DATE; }
 
   void savePrefs() override {
 #if defined(NRF52_PLATFORM)

examples/simple_secure_chat/main.cpp

@@ -261,6 +261,8 @@ protected:
 
   void onCommandDataRecv(const ContactInfo& from, uint8_t path_len, uint32_t sender_timestamp, const char *text) override {
   }
+  void onSignedMessageRecv(const ContactInfo& from, uint8_t path_len, uint32_t sender_timestamp, const uint8_t *sender_prefix, const char *text) override {
+  }
 
   void onChannelMessageRecv(const mesh::GroupChannel& channel, int in_path_len, uint32_t timestamp, const char *text) override {
     if (in_path_len < 0) {

src/helpers/BaseChatMesh.cpp

@@ -136,7 +136,29 @@ void BaseChatMesh::onPeerDataRecv(mesh::Packet* packet, uint8_t type, int sender
         if (path) sendFlood(path);
       }
     } else if (flags == TXT_TYPE_SIGNED_PLAIN) {
-      // TODO
+      if (timestamp > from.sync_since) {  // make sure 'sync_since' is up-to-date
+        from.sync_since = timestamp;
+      }
+      onSignedMessageRecv(from, packet->isRouteFlood() ? packet->path_len : 0xFF, timestamp, &data[5], (const char *) &data[9]);  // let UI know
+
+      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, 9 + strlen((char *)&data[9]), from.id.pub_key, PUB_KEY_SIZE);
+
+      if (packet->isRouteFlood()) {
+        // let this sender know path TO here, so they can use sendDirect(), and ALSO encode the ACK
+        mesh::Packet* path = createPathReturn(from.id, secret, packet->path, packet->path_len,
+                                                PAYLOAD_TYPE_ACK, (uint8_t *) &ack_hash, 4);
+        if (path) sendFlood(path);
+      } else {
+        mesh::Packet* ack = createAck(ack_hash);
+        if (ack) {
+          if (from.out_path_len < 0) {
+            sendFlood(ack);
+          } else {
+            sendDirect(ack, from.out_path, from.out_path_len);
+          }
+        }
+      }
     } else {
       MESH_DEBUG_PRINTLN("onPeerDataRecv: unsupported message type: %u", (uint32_t) flags);
     }
@@ -352,7 +374,7 @@ int  BaseChatMesh::sendStatusRequest(const ContactInfo& recipient, uint32_t& est
   uint8_t temp[13];
   uint32_t now = getRTCClock()->getCurrentTimeUnique();
   memcpy(temp, &now, 4);   // mostly an extra blob to help make packet_hash unique
-  temp[4] = CMD_GET_STATUS;
+  temp[4] = REQ_TYPE_GET_STATUS;
   memset(&temp[5], 0, 4);  // reserved (possibly for 'since' param)
   getRNG()->random(&temp[9], 4);   // random blob to help make packet-hash unique
 
@@ -372,6 +394,121 @@ int  BaseChatMesh::sendStatusRequest(const ContactInfo& recipient, uint32_t& est
   return MSG_SEND_FAILED;
 }
 
+bool BaseChatMesh::startConnection(const ContactInfo& contact, uint16_t keep_alive_secs) {
+  int use_idx = -1;
+  for (int i = 0; i < MAX_CONNECTIONS; i++) {
+    if (connections[i].keep_alive_millis == 0) {  // free slot?
+      use_idx = i;
+    } else if (connections[i].server_id.matches(contact.id)) {  // already in table?
+      use_idx = i;
+      break;
+    }
+  }
+  if (use_idx < 0) {
+    return false;   // table is full
+  }
+  connections[use_idx].server_id = contact.id;
+  uint32_t interval = connections[use_idx].keep_alive_millis = ((uint32_t)keep_alive_secs)*1000;
+  connections[use_idx].next_ping = futureMillis(interval);
+  connections[use_idx].expected_ack = 0;
+  connections[use_idx].last_activity = getRTCClock()->getCurrentTime();
+  return true;  // success
+}
+
+void BaseChatMesh::stopConnection(const uint8_t* pub_key) {
+  for (int i = 0; i < MAX_CONNECTIONS; i++) {
+    if (connections[i].server_id.matches(pub_key)) {
+      connections[i].keep_alive_millis = 0;  // mark slot as now free
+      connections[i].next_ping = 0;
+      connections[i].expected_ack = 0;
+      connections[i].last_activity = 0;
+      break;
+    }
+  }
+}
+
+bool BaseChatMesh::hasConnectionTo(const uint8_t* pub_key) {
+  for (int i = 0; i < MAX_CONNECTIONS; i++) {
+    if (connections[i].keep_alive_millis > 0 && connections[i].server_id.matches(pub_key)) return true;
+  }
+  return false;
+}
+
+void BaseChatMesh::markConnectionActive(const ContactInfo& contact) {
+  for (int i = 0; i < MAX_CONNECTIONS; i++) {
+    if (connections[i].keep_alive_millis > 0 && connections[i].server_id.matches(contact.id)) {
+      connections[i].last_activity = getRTCClock()->getCurrentTime();
+
+      // re-schedule next KEEP_ALIVE, now that we have heard from server
+      connections[i].next_ping = futureMillis(connections[i].keep_alive_millis);
+      break;
+    }
+  }
+}
+
+bool BaseChatMesh::checkConnectionsAck(const uint8_t* data) {
+  for (int i = 0; i < MAX_CONNECTIONS; i++) {
+    if (connections[i].keep_alive_millis > 0 && memcmp(&connections[i].expected_ack, data, 4) == 0) {
+      // yes, got an ack for our keep_alive request!
+      connections[i].expected_ack = 0;
+      connections[i].last_activity = getRTCClock()->getCurrentTime();
+
+      // re-schedule next KEEP_ALIVE, now that we have heard from server
+      connections[i].next_ping = futureMillis(connections[i].keep_alive_millis);
+      return true;  // yes, a match
+    }
+  }
+  return false;  /// no match
+}
+
+void BaseChatMesh::checkConnections() {
+  // scan connections[] table, send KEEP_ALIVE requests
+  for (int i = 0; i < MAX_CONNECTIONS; i++) {
+    if (connections[i].keep_alive_millis == 0) continue;  // unused slot
+
+    uint32_t now = getRTCClock()->getCurrentTime();
+    uint32_t expire_secs = (connections[i].keep_alive_millis / 1000) * 5 / 2;   // 2.5 x keep_alive interval
+    if (now >= connections[i].last_activity + expire_secs) {
+      // connection now lost
+      connections[i].keep_alive_millis = 0;
+      connections[i].next_ping = 0;
+      connections[i].expected_ack = 0;
+      connections[i].last_activity = 0;
+      continue;
+    }
+
+    if (millisHasNowPassed(connections[i].next_ping)) {
+      auto contact = lookupContactByPubKey(connections[i].server_id.pub_key, PUB_KEY_SIZE);
+      if (contact == NULL) {
+        MESH_DEBUG_PRINTLN("checkConnections(): Keep_alive contact not found!");
+        continue;
+      }
+      if (contact->out_path_len < 0) {
+        MESH_DEBUG_PRINTLN("checkConnections(): Keep_alive contact, no out_path!");
+        continue;
+      }
+
+      // send KEEP_ALIVE request
+      uint8_t data[9];
+      uint32_t now = getRTCClock()->getCurrentTimeUnique();
+      memcpy(data, &now, 4);
+      data[4] = REQ_TYPE_KEEP_ALIVE;
+      memcpy(&data[5], &contact->sync_since, 4);
+    
+      // calc expected ACK reply
+      mesh::Utils::sha256((uint8_t *)&connections[i].expected_ack, 4, data, 9, self_id.pub_key, PUB_KEY_SIZE);
+
+      auto pkt = createDatagram(PAYLOAD_TYPE_REQ, contact->id, contact->shared_secret, data, 9);
+      if (pkt) {
+        sendDirect(pkt, contact->out_path, contact->out_path_len);
+      }
+    
+      // schedule next KEEP_ALIVE
+      connections[i].next_ping = futureMillis(connections[i].keep_alive_millis);
+    }
+  }
+}
+
 void BaseChatMesh::resetPathTo(ContactInfo& recipient) {
   recipient.out_path_len = -1;
 }

src/helpers/BaseChatMesh.h

@@ -27,7 +27,8 @@ struct ContactInfo {
 #define MSG_SEND_SENT_FLOOD   1
 #define MSG_SEND_SENT_DIRECT  2
 
-#define CMD_GET_STATUS      0x01   // same as _GET_STATS
+#define REQ_TYPE_GET_STATUS      0x01   // same as _GET_STATS
+#define REQ_TYPE_KEEP_ALIVE      0x02
 
 #define RESP_SERVER_LOGIN_OK      0   // response to ANON_REQ
 
@@ -48,6 +49,18 @@ public:
   #define MAX_CONTACTS  32
 #endif
 
+#ifndef MAX_CONNECTIONS
+  #define MAX_CONNECTIONS  16
+#endif
+
+struct ConnectionInfo {
+  mesh::Identity server_id;
+  unsigned long next_ping;
+  uint32_t last_activity;
+  uint32_t keep_alive_millis;
+  uint32_t expected_ack;
+};
+
 /**
  *  \brief  abstract Mesh class for common 'chat' client
  */
@@ -66,6 +79,7 @@ class BaseChatMesh : public mesh::Mesh {
 #endif
   mesh::Packet* _pendingLoopback;
   uint8_t temp_buf[MAX_TRANS_UNIT];
+  ConnectionInfo connections[MAX_CONNECTIONS];
 
   mesh::Packet* composeMsgPacket(const ContactInfo& recipient, uint32_t timestamp, uint8_t attempt, const char *text, uint32_t& expected_ack);
 
@@ -79,6 +93,7 @@ protected:
   #endif
     txt_send_timeout = 0;
     _pendingLoopback = NULL;
+    memset(connections, 0, sizeof(connections));
   }
 
   // 'UI' concepts, for sub-classes to implement
@@ -87,6 +102,7 @@ protected:
   virtual void onContactPathUpdated(const ContactInfo& contact) = 0;
   virtual void onMessageRecv(const ContactInfo& contact, uint8_t path_len, uint32_t sender_timestamp, const char *text) = 0;
   virtual void onCommandDataRecv(const ContactInfo& contact, uint8_t path_len, uint32_t sender_timestamp, const char *text) = 0;
+  virtual void onSignedMessageRecv(const ContactInfo& contact, uint8_t path_len, uint32_t sender_timestamp, const uint8_t *sender_prefix, const char *text) = 0;
   virtual uint32_t calcFloodTimeoutMillisFor(uint32_t pkt_airtime_millis) const = 0;
   virtual uint32_t calcDirectTimeoutMillisFor(uint32_t pkt_airtime_millis, uint8_t path_len) const = 0;
   virtual void onSendTimeout() = 0;
@@ -109,6 +125,14 @@ protected:
 #endif
   void onGroupDataRecv(mesh::Packet* packet, uint8_t type, const mesh::GroupChannel& channel, uint8_t* data, size_t len) override;
 
+  // Connections
+  bool startConnection(const ContactInfo& contact, uint16_t keep_alive_secs);
+  void stopConnection(const uint8_t* pub_key);
+  bool hasConnectionTo(const uint8_t* pub_key);
+  void markConnectionActive(const ContactInfo& contact);
+  bool checkConnectionsAck(const uint8_t* data);
+  void checkConnections();
+
 public:
   mesh::Packet* createSelfAdvert(const char* name, double lat=0.0, double lon=0.0);
   int  sendMessage(const ContactInfo& recipient, uint32_t timestamp, uint8_t attempt, const char* text, uint32_t& expected_ack, uint32_t& est_timeout);

src/helpers/CommonCLI.cpp

@@ -204,7 +204,7 @@ void CommonCLI::handleCommand(uint32_t sender_timestamp, const char* command, ch
       bool s = _callbacks->formatFileSystem();
       sprintf(reply, "File system erase: %s", s ? "OK" : "Err");
     } else if (memcmp(command, "ver", 3) == 0) {
-      strcpy(reply, _callbacks->getFirmwareVer());
+      sprintf(reply, "%s (Build: %s)", _callbacks->getFirmwareVer(), _callbacks->getBuildDate());
     } else if (memcmp(command, "log start", 9) == 0) {
       _callbacks->setLoggingOn(true);
       strcpy(reply, "   logging on");

src/helpers/CommonCLI.h

@@ -28,6 +28,7 @@ class CommonCLICallbacks {
 public:
   virtual void savePrefs() = 0;
   virtual const char* getFirmwareVer() = 0;
+  virtual const char* getBuildDate() = 0;
   virtual bool formatFileSystem() = 0;
   virtual void sendSelfAdvertisement(int delay_millis) = 0;
   virtual void updateAdvertTimer() = 0;