Unset received SNR/RSSI values upon receiving packet via MQTT (#5668)

src/mqtt/MQTT.cpp

@@ -96,6 +96,9 @@ inline void onReceiveProto(char *topic, byte *payload, size_t length)
 
     UniquePacketPoolPacket p = packetPool.allocUniqueCopy(*e.packet);
     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;
 
     if (p->which_payload_variant == meshtastic_MeshPacket_decoded_tag) {
         if (moduleConfig.mqtt.encryption_enabled) {