MQTTNetHelper

项目.NetFramework版本4.5.2

Nuget安装MQTTnet版本3.0.12

 

using MQTTnet;
using MQTTnet.Client;
using MQTTnet.Client.Connecting;
using MQTTnet.Client.Disconnecting;
using MQTTnet.Client.Options;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace Common
{
        private static MqttClient mqttClient = null;
        private static IMqttClientOptions mqttOption = null;

        public static void Subscribe()
        {
            try
            {
                mqttClient = new MqttFactory().CreateMqttClient() as MqttClient;
　　　　　　　　　　//ClientId可以自定义，用于区分同账号不同客户端，多个客户端相同账号相同ClientId会导致其中只有一个能订阅到消息
                mqttOption = new MqttClientOptionsBuilder().WithClientId("id1").WithTcpServer("192.168.1.101", 8000).WithCredentials("zhangsan", "abc123").WithTls().WithCleanSession().Build();

                mqttClient.UseConnectedHandler(ConnectedHandler);
                mqttClient.UseApplicationMessageReceivedHandler(MessageReceivedHandler);
                mqttClient.UseDisconnectedHandler(DisconnectedHandler);

                mqttClient.ConnectAsync(mqttOption, CancellationToken.None);
            }
            catch (Exception ex)
            {
                //LogHelper.logger.Error(ex);
            }
        }

        static async Task ConnectedHandler(MqttClientConnectedEventArgs e)
        {
            try
            {
                await mqttClient.SubscribeAsync(new MqttTopicFilterBuilder().WithTopic("my/topic").Build());
            }
            catch (Exception ex)
            {
                //LogHelper.logger.Error(ex);
            }
        }

        static async Task MessageReceivedHandler(MqttApplicationMessageReceivedEventArgs e)
        {
            try
            {
                await new Task(() =>
                {
                    if (e.ApplicationMessage.Topic == "my/topic")
                    {
                        Console.WriteLine(Encoding.Default.GetString(e.ApplicationMessage.Payload));//PayLoad就是订阅到的消息的内容
                    }
                });
            }
            catch (Exception ex)
            {
                //LogHelper.logger.Error(ex);
            }
        }

        static async Task DisconnectedHandler(MqttClientDisconnectedEventArgs e)
        {
            try
            {
                await mqttClient.ConnectAsync(mqttOption, CancellationToken.None);//断线重连
            }
            catch (Exception ex)
            {
                //LogHelper.logger.Error(ex);
            }            
        }
}