Add unit tests for MQTT

src/mesh/MeshService.h

@@ -142,7 +142,7 @@ class MeshService
     void sendToPhone(meshtastic_MeshPacket *p);
 
     /// Send an MQTT message to the phone for client proxying
-    void sendMqttMessageToClientProxy(meshtastic_MqttClientProxyMessage *m);
+    virtual void sendMqttMessageToClientProxy(meshtastic_MqttClientProxyMessage *m);
 
     /// Send a ClientNotification to the phone
     void sendClientNotification(meshtastic_ClientNotification *cn);

src/mesh/NodeDB.h

@@ -145,7 +145,7 @@ class NodeDB
         return &meshNodes->at(x);
     }
 
-    meshtastic_NodeInfoLite *getMeshNode(NodeNum n);
+    virtual meshtastic_NodeInfoLite *getMeshNode(NodeNum n);
     size_t getNumMeshNodes() { return numMeshNodes; }
 
     // returns true if the maximum number of nodes is reached or we are running low on memory

src/mesh/RadioLibInterface.cpp

@@ -431,6 +431,7 @@ void RadioLibInterface::handleReceiveInterrupt()
             // nodes.
             meshtastic_MeshPacket *mp = packetPool.allocZeroed();
 
+            // Keep the assigned fields in sync with src/mqtt/MQTT.cpp:onReceiveProto
             mp->from = radioBuffer.header.from;
             mp->to = radioBuffer.header.to;
             mp->id = radioBuffer.header.id;

src/mesh/Router.h

@@ -71,7 +71,7 @@ class Router : protected concurrency::OSThread
      * RadioInterface calls this to queue up packets that have been received from the radio.  The router is now responsible for
      * freeing the packet
      */
-    void enqueueReceivedMessage(meshtastic_MeshPacket *p);
+    virtual void enqueueReceivedMessage(meshtastic_MeshPacket *p);
 
     /**
      * Send a packet on a suitable interface.  This routine will

src/modules/RoutingModule.h

@@ -13,7 +13,8 @@ class RoutingModule : public ProtobufModule<meshtastic_Routing>
      */
     RoutingModule();
 
-    void sendAckNak(meshtastic_Routing_Error err, NodeNum to, PacketId idFrom, ChannelIndex chIndex, uint8_t hopLimit = 0);
+    virtual void sendAckNak(meshtastic_Routing_Error err, NodeNum to, PacketId idFrom, ChannelIndex chIndex,
+                            uint8_t hopLimit = 0);
 
     // Given the hopStart and hopLimit upon reception of a request, return the hop limit to use for the response
     uint8_t getHopLimitForResponse(uint8_t hopStart, uint8_t hopLimit);

src/mqtt/MQTT.cpp

@@ -76,12 +76,22 @@ inline void onReceiveProto(char *topic, byte *payload, size_t length)
         return;
     }
     LOG_INFO("Received MQTT topic %s, len=%u", topic, length);
+    if (e.packet->hop_limit > HOP_MAX || e.packet->hop_start > HOP_MAX) {
+        LOG_INFO("Invalid hop_limit(%u) or hop_start(%u)", e.packet->hop_limit, e.packet->hop_start);
+        return;
+    }
 
-    UniquePacketPoolPacket p = packetPool.allocUniqueCopy(*e.packet);
+    UniquePacketPoolPacket p = packetPool.allocUniqueZeroed();
+    p->from = e.packet->from;
+    p->to = e.packet->to;
+    p->id = e.packet->id;
+    p->channel = e.packet->channel;
+    p->hop_limit = e.packet->hop_limit;
+    p->hop_start = e.packet->hop_start;
+    p->want_ack = e.packet->want_ack;
     p->via_mqtt = true; // Mark that the packet was received via MQTT
-    // Unset received SNR/RSSI which might have been added by the MQTT gateway
-    p->rx_snr = 0;
-    p->rx_rssi = 0;
+    p->which_payload_variant = e.packet->which_payload_variant;
+    memcpy(&p->decoded, &e.packet->decoded, std::max(sizeof(p->decoded), sizeof(p->encrypted)));
 
     if (p->which_payload_variant == meshtastic_MeshPacket_decoded_tag) {
         if (moduleConfig.mqtt.encryption_enabled) {