Added debug for mqtt message as well

lib/controller.js

@@ -317,7 +317,7 @@ class Controller {
     }
 
     handleMQTTMessage(topic, message) {
-        logger.debug(`Incoming MQTT message '${topic}' '${message.toString()}'`);
+        logger.debug(`Recieved mqtt message on topic '${topic}' with data '${message}'`);
 
         if (topic.match(mqttConfigRegex)) {
             this.handleMQTTMessageConfig(topic, message);