基於開源 Net MQTT Client 鏈接阿里雲物聯網平臺

概述

前面分別介紹了基於開源MQTT Client Java及Python語言鏈接阿里雲物聯網平臺的示例，這裏使用M2Mqtt Client C#進行測試，結合自定義Topic演示消息的上下行。

操做步驟

一、安裝M2Mqtt

二、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;

            // 在產品控制檯建立對應的自定義Topic，而後在設備Topic列表便可獲取
            string PubTopic = "/******/******/user/Data1";
            string SubTopic = "/******/******/user/Data2";

            // 發佈消息到自定義Topic
            string content = "{'content':'msg from :" + mqttClientId + ", Hello World'}";
            var id = client.Publish(PubTopic, Encoding.UTF8.GetBytes(content));

            // 從自定義Topic訂閱消息
            client.Subscribe(new string[] { SubTopic }, new byte[] { 0 });
        }

        /// <summary>
        /// 設置訂閱回調
        /// </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);
        }
    }
}

簽名方式的獲取參考連接。

三、消息上行查看

四、下行消息測試

更多參考

C#語言.NET平臺接入
基於開源JAVA MQTT Client鏈接阿里雲IoT
阿里雲物聯網平臺Qucik Start
基於開源Python MQTT Client鏈接阿里雲IoT

 

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