Add hops_away to JSON output (#3357)

src/mqtt/MQTT.cpp

@@ -808,6 +808,8 @@ std::string MQTT::meshPacketToJson(meshtastic_MeshPacket *mp)
         jsonObj["rssi"] = new JSONValue((int)mp->rx_rssi);
     if (mp->rx_snr != 0)
         jsonObj["snr"] = new JSONValue((float)mp->rx_snr);
+    if (mp->hop_start != 0 && mp->hop_limit <= mp->hop_start)
+        jsonObj["hops_away"] = new JSONValue((uint)(mp->hop_start - mp->hop_limit));
 
     // serialize and write it to the stream
     JSONValue *value = new JSONValue(jsonObj);