关于MQTT
在这里我就不做过多的介绍了 , 超时空连接点我
MQTT示例
注: 该示例演示统一使用WPF, 简单MVVM模式演示, 复制代码需注意引用 NuGet包 GalaSoft
MQTT服务端建立：
演示界面:
演示代码：
public class MainViewModel : ViewModelBase { /// <summary> /// Initializes a new instance of the MainViewModel class. /// </summary> public MainViewModel() { ClientInsTances = new ObservableCollection<ClientInstance>(); } IMqttServer mqttServer; //MQTT服务端实例 string message; /// <summary> /// 消息 用于界面显示 /// </summary> public string Message { get { return message; } set { message = value; RaisePropertyChanged(); } } ObservableCollection<ClientInstance> clientInstances; //客户端登陆缓存信息 /// <summary> /// 客户端实例 /// </summary> public ObservableCollection<ClientInstance> ClientInsTances { get { return clientInstances; } set { clientInstances = value; RaisePropertyChanged(); } }
//开启MQTT服务 public void OpenMqttServer() { mqttServer = new MqttFactory().CreateMqttServer(); var options = new MqttServerOptions(); //拦截登录 options.ConnectionValidator = c => { try { Message += string.Format("用户尝试登录:用户ID：{0}\t用户信息：{1}\t用户密码：{2}", c.ClientId, c.Username, c.Password) + "\r\n"; if (string.IsNullOrWhiteSpace(c.Username)) { Message += string.Format("用户：{0}登录失败，用户信息为空", c.ClientId) + "\r\n"; c.ReturnCode = MQTTnet.Protocol.MqttConnectReturnCode.ConnectionRefusedBadUsernameOrPassword; return; } //解析用户名和密码，这个地方需要改成查找我们自己创建的用户名和密码。 if (c.Username == "admin" && c.Password == "123456") { c.ReturnCode = MqttConnectReturnCode.ConnectionAccepted; Message += c.ClientId + " 登录成功" + "\r\n"; ClientInsTances.Add(new ClientInstance() { ClientID = c.ClientId, UserName = c.Username, PassWord = c.Password }); return; } else { c.ReturnCode = MqttConnectReturnCode.ConnectionRefusedBadUsernameOrPassword; Message += "用户名密码错误登陆失败" + "\r\n"; return; } } catch (Exception ex) { Console.WriteLine("登录失败:" + ex.Message); c.ReturnCode = MqttConnectReturnCode.ConnectionRefusedIdentifierRejected; return; } }; //拦截订阅 options.SubscriptionInterceptor = async context => { try { Message += "用户" + context.ClientId + "订阅" + "\r\n"; } catch (Exception ex) { Console.WriteLine("订阅失败:" + ex.Message); context.AcceptSubscription = false; } }; //拦截消息 options.ApplicationMessageInterceptor = context => { try { //一般不需要处理消息拦截 // Console.WriteLine(Encoding.UTF8.GetString(context.ApplicationMessage.Payload)); } catch (Exception ex) { Console.WriteLine("消息拦截:" + ex.Message); } }; mqttServer.ClientDisconnected += ClientDisconnected; mqttServer.ClientConnected += MqttServer_ClientConnected; mqttServer.Started += MqttServer_Started; mqttServer.StartAsync(options); } private void MqttServer_Started(object sender, EventArgs e) { Message += "消息服务启动成功：任意键退出" + "\r\n"; } private void MqttServer_ClientConnected(object sender, MqttClientConnectedEventArgs e) { //客户端链接 Message += e.ClientId + "连接" + "\r\n"; } private void ClientDisconnected(object sender, MqttClientDisconnectedEventArgs e) { //客户端断开 Message += e.ClientId + "断开" + "\r\n"; } /// <summary> /// 客户端推送信息 - 用于测试服务推送 /// </summary> /// <param name="clientID"></param> /// <param name="message"></param> public void SendMessage(string clientID, string message) { mqttServer.PublishAsync(new MqttApplicationMessage { Topic = clientID, QualityOfServiceLevel = MqttQualityOfServiceLevel.ExactlyOnce, Retain = false, Payload = Encoding.UTF8.GetBytes(message), }); } }
添加MQTT 客户端登陆实例, 用于保存客户的登陆信息, 如下：
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演示界面：
/// <summary> /// 登陆客户端信息 /// </summary> public class ClientInstance : ViewModelBase { private string clientID; private string userName; private string passWord; /// <summary> /// 识别ID /// </summary> public string ClientID { get { return clientID; } set { clientID = value; RaisePropertyChanged(); } } /// <summary> /// 账户 /// </summary> public string UserName { get { return userName; } set { userName = value; RaisePropertyChanged(); } } /// <summary> /// 密码 /// </summary> public string PassWord { get { return passWord; } set { passWord = value; RaisePropertyChanged(); } } }
MQTT客户端建立：
演示代码:
public class MainViewModel : ViewModelBase { /// <summary> /// Initializes a new instance of the MainViewModel class. /// </summary> public MainViewModel() { clientID = new Random().Next(999, 9999) + ""; //测试随机生成ClientID } IMqttClient mqttClient; //MQTT客户端实例 string clientID; //机器ID string message; public string Message //用于接收当前 消息 { get { return message; } set { message = value; RaisePropertyChanged(); } }
//开启MQTT连接 public async void SignMqttServer() { var options = new MqttClientOptionsBuilder() .WithClientId(clientID) //传递ClientID .WithTcpServer("127.0.0.1", 1883) //MQTT服务的地址 .WithCredentials("admin", "123456") //传递账号密码 .WithCleanSession() .Build(); mqttClient = new MqttFactory().CreateMqttClient();// .CreateManagedMqttClient(); mqttClient.Connected += MqttClient_Connected; mqttClient.Disconnected += MqttClient_Disconnected; mqttClient.ApplicationMessageReceived += MqttClient_ApplicationMessageReceived; //创建消息接受事件 await mqttClient.ConnectAsync(options); //await mqttClient.SubscribeAsync(clientID); } private void MqttClient_ApplicationMessageReceived(object sender, MqttApplicationMessageReceivedEventArgs e) { Message += "收到的信息:" + Encoding.UTF8.GetString(e.ApplicationMessage.Payload) + "\r\n"; } private void MqttClient_Disconnected(object sender, MqttClientDisconnectedEventArgs e) { Message += "客户端断开"; } private void MqttClient_Connected(object sender, MqttClientConnectedEventArgs e) { Message += "客户端已连接" + "\r\n"; mqttClient.SubscribeAsync(new TopicFilterBuilder().WithTopic(clientID).Build()); //关联服务端订阅, 用于接受服务端推送信息 } }
演示界面：
实际演示效果(GIF)
