mqtt

参考 http://blog.csdn.net/leytton/article/details/51896738

 

1、引入M2MQTT的dll库文件

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2、建立客户端连接并订阅

//创建客户端实例
MqttClient client = new MqttClient(IPAddress.Parse(MQTT_BROKER_ADDRESS)); //主机为IP时
MqttClient client = new MqttClient(MQTT_BROKER_ADDRESS); //当主机地址为域名时

// 注册消息接收处理事件，还可以注册消息订阅成功、取消订阅成功、与服务器断开等事件处理函数
client.MqttMsgPublishReceived += client_MqttMsgPublishReceived;

//生成客户端ID并连接服务器
string clientId = Guid.NewGuid().ToString();
client.Connect(clientId);

// 订阅主题"/home/temperature" 消息质量为 2
client.Subscribe(new string[] { "/home/temperature" }, new byte[] { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE });

...

void client_MqttMsgPublishReceived(object sender, MqttMsgPublishEventArgs e)
{
//处理接收到的消息
string msg = System.Text.Encoding.Default.GetString(e.Message);
        textBox1.AppendText("收到消息:" + msg + "\r\n");
}

 

3、发布消息

// 发布消息到主题 "/home/temperature" 消息质量为 2,不保留
client.Publish("/home/temperature", Encoding.UTF8.GetBytes("hello"), MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE, false);