实例介绍
【实例简介】
【实例截图】
【核心代码】
using MQTTnet; using MQTTnet.Core; using MQTTnet.Core.Client; using MQTTnet.Core.Packets; using MQTTnet.Core.Protocol; using System; using System.Collections.Generic; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace MqttClientWin { public partial class FmMqttClient : Form { private MqttClient mqttClient = null; public FmMqttClient() { InitializeComponent(); Task.Run(async () => { await ConnectMqttServerAsync(); }); } /// <summary> /// 连接服务器 /// </summary> /// <returns></returns> private async Task ConnectMqttServerAsync() { if (mqttClient == null) { mqttClient = new MqttClientFactory().CreateMqttClient() as MqttClient; mqttClient.ApplicationMessageReceived = MqttClient_ApplicationMessageReceived; mqttClient.Connected = MqttClient_Connected; mqttClient.Disconnected = MqttClient_Disconnected; } try { var options = new MqttClientTcpOptions { Server = "127.0.0.1", //Server = "172.16.30.77", ClientId = Guid.NewGuid().ToString().Substring(0, 5), UserName = "u001", Password = "p001", CleanSession = true }; await mqttClient.ConnectAsync(options); } catch (Exception ex) { Invoke((new Action(() => { txtReceiveMessage.AppendText($"连接到MQTT服务器失败!" Environment.NewLine ex.Message Environment.NewLine); }))); } } /// <summary> /// 服务器连接成功 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void MqttClient_Connected(object sender, EventArgs e) { Invoke((new Action(() => { txtReceiveMessage.AppendText("已连接到MQTT服务器!" Environment.NewLine); }))); } /// <summary> /// 断开服务器连接 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void MqttClient_Disconnected(object sender, EventArgs e) { Invoke((new Action(() => { txtReceiveMessage.AppendText("已断开MQTT连接!" Environment.NewLine); }))); } /// <summary> /// 接收到消息 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void MqttClient_ApplicationMessageReceived(object sender, MqttApplicationMessageReceivedEventArgs e) { Invoke((new Action(() => { txtReceiveMessage.AppendText($">> {Encoding.UTF8.GetString(e.ApplicationMessage.Payload)}{Environment.NewLine}"); }))); } /// <summary> /// 订阅消息 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void BtnSubscribe_ClickAsync(object sender, EventArgs e) { string topic = txtSubTopic.Text.Trim(); if (string.IsNullOrEmpty(topic)) { MessageBox.Show("订阅主题不能为空!"); return; } if (!mqttClient.IsConnected) { MessageBox.Show("MQTT客户端尚未连接!"); return; } mqttClient.SubscribeAsync(new List<TopicFilter> { new TopicFilter(topic, MqttQualityOfServiceLevel.AtMostOnce) }); txtReceiveMessage.AppendText($"已订阅[{topic}]主题" Environment.NewLine); txtSubTopic.Enabled = false; btnSubscribe.Enabled = false; } /// <summary> /// 发布主题 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void BtnPublish_Click(object sender, EventArgs e) { string topic = txtPubTopic.Text.Trim(); if (string.IsNullOrEmpty(topic)) { MessageBox.Show("发布主题不能为空!"); return; } string inputString = txtSendMessage.Text.Trim(); var appMsg = new MqttApplicationMessage(topic, Encoding.UTF8.GetBytes(inputString), MqttQualityOfServiceLevel.AtMostOnce, false); mqttClient.PublishAsync(appMsg); } private void FmMqttClient_Load(object sender, EventArgs e) { //Dictionary<string, string> dic = new Dictionary<string, string>(); //dic.Add("ClientId", "123"); //dic.Add("Topic", "ttt"); //dic.Add("Value", "ggyy"); //dic.Add("ServiceLevel", "1"); //TopicLogic.SaveTopic(dic); } } }
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