mqtt多线程客户端实例

环境：windows server 2008 r2+vs2017+.net4.6.1/4.7

组件：MQTTnet.dll (开源)

客户端（连接-订阅-发布）

using MQTTnet; using MQTTnet.Client; 
using MQTTnet.Diagnostics; 
using MQTTnet.Extensions.ManagedClient; 
using MQTTnet.Protocol;

MQTTnet 最新版本 2.8.2.0

private IMqttClient _mqttClient; 
private Action<string> _updateListBoxAction; 
private List<IManagedMqttClient> managedMqttClients = new List<IManagedMqttClient>();

MqttNetGlobalLogger.LogMessagePublished += (o, args) => { var s = new StringBuilder(); s.Append($"{args.TraceMessage.Timestamp} "); s.Append($"{args.TraceMessage.Level} "); s.Append($"{args.TraceMessage.Source} "); s.Append($"{args.TraceMessage.ThreadId} "); s.Append($"{args.TraceMessage.Message} "); s.Append($"{args.TraceMessage.Exception}"); s.Append($"{args.TraceMessage.LogId} "); };

var ips = Dns.GetHostAddressesAsync(Dns.GetHostName()); 
TxbServer.Text = ips.Result[1].ToString(); 
foreach (var ip in ips.Result) { 
switch (ip.AddressFamily) { 
case AddressFamily.InterNetwork: TxbServer.Text = ip.ToString();//本地IP地址 break; 
case AddressFamily.InterNetworkV6: break; } } 
//订阅质量参数：0,1,2 
foreach (var value in Enum.GetValues(typeof(MqttQualityOfServiceLevel))) { CmbPubMqttQuality.Items.Add((int) value); 
CmbSubMqttQuality.Items.Add((int) value); } CmbPubMqttQuality.SelectedItem = 0; CmbSubMqttQuality.SelectedIndex = 0; //消息列表自动清首条 （满100条后，先进先出） _updateListBoxAction = new Action<string>((s) => { listBox1.Items.Add(s); 
if (listBox1.Items.Count > 100) { listBox1.Items.RemoveAt(0); } });

//断开连接方法 if (null != _mqttClient && _mqttClient.IsConnected) 
{ 
await _mqttClient.DisconnectAsync(); 
_mqttClient.Dispose(); 
_mqttClient = null; 
}

//订阅  
try 
{ Task.Factory.StartNew(async () => { await _mqttClient.SubscribeAsync( new List<TopicFilter> { new TopicFilter( txbSubscribe.Text, (MqttQualityOfServiceLevel) Enum.Parse(typeof (MqttQualityOfServiceLevel), CmbSubMqttQuality.Text)) }); }); 
} catch (Exception) 
{ throw; }

//发布主题 try { Task.Factory.StartNew(async () => { var msg = new MqttApplicationMessage() {//主题，内容，质量，不保留 
Topic = TxbTopic.Text, 
Payload = Encoding.UTF8.GetBytes(TxbPayload.Text), 
QualityOfServiceLevel = (MqttQualityOfServiceLevel) Enum.Parse(typeof (MqttQualityOfServiceLevel), CmbPubMqttQuality.Text), Retain = false }; 
if (null != _mqttClient) { await _mqttClient.PublishAsync(msg); } }); 
} catch (Exception)
 { throw; }

private async void MqttClient() {//连接函数 
try { var options = new MqttClientOptions() {
ClientId = Guid.NewGuid().ToString("D")}; 
options.ChannelOptions = new MqttClientTcpOptions() {//服务器地址和端口默认1883 
Server = TxbServer.Text, 
Port = Convert.ToInt32(TxbPort.Text) }; 
options.Credentials = new MqttClientCredentials() {//账号密码（修改为您的账号密码） 
Username = "admin", 
Password = "public" 
}; //3个选项（清除对话，激活间隔，激活频率） 
options.CleanSession = true; 
options.KeepAlivePeriod = TimeSpan.FromSeconds(100.5); 
options.KeepAliveSendInterval = TimeSpan.FromSeconds(20000); 
if (null != _mqttClient) {//断开 await _mqttClient.DisconnectAsync(); 
_mqttClient = null; } _mqttClient = new MqttFactory().CreateMqttClient(); //接收到发布 _mqttClient.ApplicationMessageReceived += (sender, args) => {//异步操作 listBox1.BeginInvoke( _updateListBoxAction, $"ClientID:{args.ClientId} | TOPIC:{args.ApplicationMessage.Topic} | Payload:{Encoding.UTF8.GetString(args.ApplicationMessage.Payload)} | QoS:{args.ApplicationMessage.QualityOfServiceLevel} | Retain:{args.ApplicationMessage.Retain}" ); }; 

//连接成功 _mqttClient.Connected += (sender, args) => { listBox1.BeginInvoke(_updateListBoxAction, $"Client is Connected: IsSessionPresent:{args.IsSessionPresent}"); }; 

//断开连接 _mqttClient.Disconnected += (sender, args) => { listBox1.BeginInvoke(_updateListBoxAction, $"Client is DisConnected ClientWasConnected:{args.ClientWasConnected}"); }; 
await _mqttClient.ConnectAsync(options); } 
catch (Exception) 
{ throw; } 
}

实例定制（基于#MQTT#的定制），MQTT服务端实例见下一篇文章

支持多线程客户端连接代码关注私信获取。

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该实例对应的控制模块（基于ESP8266-12F开发）固件自行烧制

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mqtt多线程客户端实例

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