Summary

Operation steps

1, installation M2Mqtt

2,Code sample

using System;
using System.Text;
using uPLibrary.Networking.M2Mqtt;
using uPLibrary.Networking.M2Mqtt.Messages;

namespace MQTTDemo
{
    class Program
    {
        //private MqttClient client;
        static void Main(string[] args)
        {
            string ServerUrl = "*****.iot-as-mqtt.cn-shanghai.aliyuncs.com";
            string UserName = "******";
            string Password = "******";
            string clientId = "******";

            ConnectMqtt(ServerUrl, clientId, UserName, Password);

            Console.ReadKey();
        }

        static void ConnectMqtt(string targetServer, string mqttClientId, string mqttUserName, string mqttPassword)
        {
            MqttClient client = new MqttClient(targetServer);
            client.ProtocolVersion = MqttProtocolVersion.Version_3_1_1;

            client.Connect(mqttClientId, mqttUserName, mqttPassword, false, 60);
            client.MqttMsgPublishReceived += Client_MqttMsgPublishReceived;

            // Create the corresponding custom Topic in the product console, and then obtain it in the device Topic list
            string PubTopic = "/******/******/user/Data1";
            string SubTopic = "/******/******/user/Data2";

            // Publish message to custom Topic
            string content = "{'content':'msg from :" + mqttClientId + ", Hello World'}";
            var id = client.Publish(PubTopic, Encoding.UTF8.GetBytes(content));

            // Subscribe to messages from a custom Topic
            client.Subscribe(new string[] { SubTopic }, new byte[] { 0 });
        }

        /// <summary>
        ///Set subscription callback
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        static void Client_MqttMsgPublishReceived(object sender, MqttMsgPublishEventArgs e)
        {
            // handle message received
            string topic = e.Topic;
            string message = Encoding.UTF8.GetString(e.Message);
            Console.WriteLine("Device receive message topic :" + topic + " ,the message body is " + message);
        }
    }
}

3. Message uplink view

4. Downlink message test

More reference

C ා language. NET platform access
Connect alicloud IoT based on open source JAVA MQTT Client
Alicloud Internet of things platform Qucik Start
Connect alicloud IoT based on open source Python MQTT Client

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