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                                            Yanwen An  Andy

I cannot send message to MQTT broker

publish是发布消息，你要接收消息，需要用on来订阅这个topic，其中的参数MqttHandler hanler是一个接口实现，在这个接口实现中写自己的onMessage方法。 `/** * Subscribe on the given topic, with the given qos. When a message is received, MqttClient will invoke the {@link MqttHandler#onMessage(String, ByteBuf)} function of the given handler...