code review: added check if mqtt is enabled before sending out values

tools/esp8266/app.cpp

@@ -376,7 +376,8 @@ void app::processPayload(bool retransmit) {
                     
                     iv->setQueuedCmdFinished();
 
-                    // send out
+                    // MQTT send out
+                    if(mMqttActive) {
                         char topic[30], val[10];
                         for (uint8_t id = 0; id < mSys->getNumInverters(); id++)
                         {
@@ -395,6 +396,7 @@ void app::processPayload(bool retransmit) {
                                 }
                             }
                         }
+                    }
 
 #ifdef __MQTT_AFTER_RX__
                     doMQTT = true;