do not handle retained messages

src/main.js

@@ -1,10 +1,6 @@
 let logger = require('./log');
 let mqtt = require('./mqttHandler');
 
-
-logger.info("Hello world!");
-
-
 let HomematicDimmerItemClass = require('./HomematicDimmerItem');
 let HomematicSwitchItemClass = require('./HomematicSwitchItem');
 let M433SwitchItem = require('./M433SwitchItem');

src/mqttHandler.js

@@ -24,10 +24,12 @@ function start() {
         });
         logger.info('mqtt connection established');
     });
-    client.on('message', (topic, payload) => {
+    client.on('message', (topic, payload, packet) => {
+        if (! packet.retain) {
             payload = payload.toString('UTF-8');
             logger.info(`message received on topic ${topic}: ${payload}`);
             processMessage(topic, payload);
+        }
     });
 }