refactoring

src/mqttHandler.js

@@ -25,6 +25,7 @@ function start() {
         logger.info('mqtt connection established');
     });
     client.on('message', (topic, payload) => {
+        payload = payload.toString('UTF-8');
         logger.info(`message received on topic ${topic}: ${payload}`);
         if (topic in topicCallbacks) {
             topicCallbacks[topic].forEach((cb) => { cb(topic, payload) });