add mqtt over websocket

iot-components/iot-mqtt-component/src/main/java/cc/iotkit/comp/mqtt/MqttConfig.java

@@ -22,4 +22,6 @@ public class MqttConfig {
 
     private boolean ssl;
 
+    private boolean useWebSocket;
+
 }

iot-components/iot-mqtt-component/src/main/java/cc/iotkit/comp/mqtt/MqttVerticle.java

@@ -63,6 +63,7 @@ public class MqttVerticle extends AbstractVerticle {
                             .setKeyPath(config.getSslKey())
                             .setCertPath(config.getSslCert()));
         }
+        options.setUseWebSocket(config.isUseWebSocket());
 
         mqttServer = MqttServer.create(vertx, options);
         mqttServer.endpointHandler(endpoint -> {