First real test using MQTT to send and receive messages.

- also try to setup CI (might fail)

src/main/resources/MqttUpdater.jadd

@@ -145,16 +145,18 @@ public class MqttUpdater {
 
     // subscribe at broker
     org.fusesource.mqtt.client.Topic[] topicArray = { new org.fusesource.mqtt.client.Topic(topic, this.qos) };
-    connection.subscribe(topicArray, new org.fusesource.mqtt.client.Callback<byte[]>() {
-      @Override
-      public void onSuccess(byte[] qoses) {
-        logger.debug("Subscribed to {}, qoses: {}", topic, qoses);
-      }
+    connection.getDispatchQueue().execute(() -> {
+      connection.subscribe(topicArray, new org.fusesource.mqtt.client.Callback<byte[]>() {
+        @Override
+        public void onSuccess(byte[] qoses) {
+          logger.debug("Subscribed to {}, qoses: {}", topic, qoses);
+        }
 
-      @Override
-      public void onFailure(Throwable cause) {
-        logger.error("Could not subscribe to {}", topic, cause);
-      }
+        @Override
+        public void onFailure(Throwable cause) {
+          logger.error("Could not subscribe to {}", topic, cause);
+        }
+      });
     });
   }
 
@@ -187,30 +189,34 @@ public class MqttUpdater {
       logger.warn("Stopping without connection. Was setHost() called?");
       return;
     }
-    connection.disconnect(new org.fusesource.mqtt.client.Callback<Void>() {
-      @Override
-      public void onSuccess(Void value) {
-        logger.info("Disconnected {} from {}", name, host);
-      }
+    connection.getDispatchQueue().execute(() -> {
+      connection.disconnect(new org.fusesource.mqtt.client.Callback<Void>() {
+        @Override
+        public void onSuccess(Void value) {
+          logger.info("Disconnected {} from {}", name, host);
+        }
 
-      @Override
-      public void onFailure(Throwable ignored) {
-        // Disconnects never fail. And we do not care either.
-      }
+        @Override
+        public void onFailure(Throwable ignored) {
+          // Disconnects never fail. And we do not care either.
+        }
+      });
     });
   }
 
   public void publish(String topic, byte[] bytes) {
-    connection.publish(topic, bytes, qos, false, new org.fusesource.mqtt.client.Callback<Void>() {
-      @Override
-      public void onSuccess(Void value) {
-        logger.debug("Published some bytes to {}", topic);
-      }
+    connection.getDispatchQueue().execute(() -> {
+      connection.publish(topic, bytes, qos, false, new org.fusesource.mqtt.client.Callback<Void>() {
+        @Override
+        public void onSuccess(Void value) {
+          logger.debug("Published some bytes to {}", topic);
+        }
 
-      @Override
-      public void onFailure(Throwable value) {
-        logger.warn("Could not publish on topic '{}'", topic);
-      }
+        @Override
+        public void onFailure(Throwable value) {
+          logger.warn("Could not publish on topic '{}'", topic);
+        }
+      });
     });
   }
 }