fix in mqtt clientId

dist/MqttDispatcher.js

@@ -8,6 +8,7 @@ class MqttHandler {
     constructor() {
         this.mqttOptions = {};
         this.mqttBrokerUrl = config.dict.brokerUrl;
+        this.mqttOptions.clientId = 'dispatcher';
         if (config.dict.brokerUser && config.dict.brokerPass) {
             this.mqttOptions.username = config.dict.brokerUser;
             this.mqttOptions.password = config.dict.brokerPass;