interface instead of type

src/main.ts

@@ -15,6 +15,8 @@ class Dispatcher {
         log.info("Dispatcher starting")
 
         this._mqttClient.exec()
+
+        log.info("Dispatcher running")
     }
 }
 

src/mqttclient.ts

@@ -3,12 +3,13 @@ import * as log from './log'
 
 const MQTT_BROKER_DEFAULT_URL : string = "mqtt://localhost"
 
-type TopicHandlerCallback = (message: Buffer) => void
+type TopicHandlerCallback = (message: any) => any
 
-type TopicHandler = {
+interface TopicHandler {
     topic: string,
     callback: TopicHandlerCallback|null
 }
+
 export class MqttClient {
     private _mqttClient: Mqtt.Client
     private _mqttBrokerUrl: string
@@ -38,6 +39,9 @@ export class MqttClient {
             for (let topicHandler of this._topicHandlers) {
                 if (this.topicMatch(topicHandler.topic, topic)) {
                     log.info(`received topic ${topic} matches registered topic ${topicHandler.topic}`)
+                    if (topicHandler.callback != null) {
+                        topicHandler.callback(payload)
+                    }
                 }
             }
         })