C#MQTT协议应用

news2024/12/23 2:21:11

1 ,MQTT介绍:
MQTT详解以及实际操作_mqtt使用-CSDN博客

2,MQTT应用:

C#MQTT编程06--MQTT服务器和客户端(winform版)_c# mqtt服务器-CSDN博客

3,MQTT实例:

 

效果 

代码:

服务端

  public partial class Form1 : Form
    {
        Timer timer = new Timer();
        List<ClientItem> clients = new List<ClientItem>();
        public Form1()
        {
            InitializeComponent();
            timer.Interval = 500;
            timer.Tick += Timer_Tick;
            timer.Start();
            InitSetting();
        }
        private void Timer_Tick(object sender, EventArgs e)
        {
            toolStripStatusDateTime.Text = DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss");
        }
        void InitSetting()
        {
            //获取本机所有的IP4地址
            string[] ips = Dns.GetHostAddresses(Environment.MachineName).Where(item => !item.IsIPv6LinkLocal).Select(item => item.ToString()).ToArray();
            comboIp_List.DataSource = ips;
            txtPort.Text = "8000";
            txtUserName.Text = "sa";
            txtPwd.Text = "1";
        }
        IMqttServer mqttServer;
        private void btnStart_Click(object sender, EventArgs e)
        {
            if (btnStart.Text.Equals("开始"))
            {
                IMqttServerOptions options = new MqttServerOptionsBuilder()
               .WithConnectionBacklog(10)
               .WithDefaultEndpointBoundIPAddress(IPAddress.Parse(comboIp_List.Text.Trim()))
               .WithDefaultEndpointPort(Convert.ToInt32(txtPort.Text.Trim()))
               .WithDefaultCommunicationTimeout(TimeSpan.FromMilliseconds(5000))
               .WithConnectionValidator(context =>
               {
                   //验证
                   if (ck_UserPwd.Checked)
                   {
                       if (!context.Username.Equals(txtUserName.Text))
                       {
                           context.ReasonCode = MQTTnet.Protocol.MqttConnectReasonCode.BadUserNameOrPassword;
                          
                           
                       }
                       if (!context.Password.Equals(txtPwd.Text))
                       {
                           context.ReasonCode = MQTTnet.Protocol.MqttConnectReasonCode.BadUserNameOrPassword;
                         
                       }
                   }
                   else
                   {
                       context.ReasonCode = MQTTnet.Protocol.MqttConnectReasonCode.Success;
                   }
               }).Build();
                mqttServer = new MqttFactory().CreateMqttServer();
                mqttServer.ApplicationMessageReceivedHandler = new MqttApplicationMessageReceivedHandlerDelegate(ApplicationMessageReceived);
                //服务开始事件
                mqttServer.StartedHandler = new MqttServerStartedHandlerDelegate(MqttServer_StartedAsync);
                //服务停止事件
                mqttServer.StoppedHandler = new MqttServerStoppedHandlerDelegate(MqttServer_StoppedAsync);
                //客户端连接事件
                mqttServer.ClientConnectedHandler = new MqttServerClientConnectedHandlerDelegate(MqttServer_ClientConnectedAsync);
                //客户端断开连接事件
                mqttServer.ClientDisconnectedHandler = new MqttServerClientDisconnectedHandlerDelegate(MqttServer_ClientDisconnectedAsync);
                //客户端订阅事件
                mqttServer.ClientSubscribedTopicHandler = new MqttServerClientSubscribedTopicHandlerDelegate(MqttServer_ClientSubscribedTopicAsync);
                //客户端取消订阅事件
                mqttServer.ClientUnsubscribedTopicHandler = new MqttServerClientUnsubscribedTopicHandlerDelegate(MqttServer_ClientUnsubscribedTopicAsync);
               
                mqttServer.StartAsync(options);
           
                if (mqttServer.IsStarted)
                {
                    btnStart.Text = "断开";
                    btnStart.BackColor = Color.Green;
                    comboIp_List.Enabled = txtPort.Enabled = false;
                }
            }
            else
            {
                mqttServer.StopAsync().Wait();
                if (!mqttServer.IsStarted)
                {
                    btnStart.Text = "开始";
                    btnStart.BackColor = Color.Red;
                    comboIp_List.Enabled = txtPort.Enabled = true;
                }
                mqttServer.Dispose();
            }
        }
        private Task MqttServer_ClientUnsubscribedTopicAsync(MqttServerClientUnsubscribedTopicEventArgs arg)
        {
            //客户端取消订阅事件
            string msg = $"客户端ID:[{arg.ClientId}] 取消主题:[{arg.TopicFilter}] 订阅";
            AddLog(1, msg);
            //取消订阅
            ClientItem client = clients.FirstOrDefault(item => item.ClientID.Equals(arg.ClientId));
            client?.Topics.RemoveAll(item => item.Topic.Equals(arg.TopicFilter));
            return Task.FromResult(arg);
        }
        private Task MqttServer_ClientSubscribedTopicAsync(MqttServerClientSubscribedTopicEventArgs arg)
        {
            //客户端订阅事件
            string msg = $"客户端ID:[{arg.ClientId}]订阅主题:[{arg.TopicFilter.Topic}],Qos:[{arg.TopicFilter.QualityOfServiceLevel}]";
            AddLog(0, msg);
            TopicItem topic = new TopicItem { QualityOfServiceLevel = arg.TopicFilter.QualityOfServiceLevel, Topic = arg.TopicFilter.Topic };
            ClientItem client = clients.FirstOrDefault(item => item.ClientID.Equals(arg.ClientId));
            client?.Topics.Add(topic);
            return Task.FromResult(arg);
        }
        private Task MqttServer_ClientDisconnectedAsync(MqttServerClientDisconnectedEventArgs arg)
        {
            //客户端断开事件
            string msg = $"客户端ID:[{arg.ClientId}] 断开连接,EndPoint:{arg.Endpoint},断开连接类型:{arg.DisconnectType}";
            AddLog(1, msg);
            //移除该Client
            clients.RemoveAll(item => item.ClientID.Equals(arg.ClientId));
            //更新ListBox
            UpdateClientList();
            return Task.FromResult(arg);
        }
        private Task MqttServer_ClientConnectedAsync(MqttServerClientConnectedEventArgs arg)
        {
            //客户端连接事件
            string msg = $"客户端ID:[{arg.ClientId}]连接 ,EndPoint:{arg.Endpoint},UserName: {arg.UserName}";
            AddLog(0, msg);
            ClientItem client = new ClientItem
            {
                ClientID = arg.ClientId,
                EndPoint = arg.Endpoint

            };
            clients.Add(client);
            //更新ListBox
            UpdateClientList();
            return Task.FromResult(arg);
        }
        private Task ApplicationMessageReceived(MqttApplicationMessageReceivedEventArgs arg)
        {
            //客户端MessageReceived事件
            string msg = $"收到消息:发送者ID:[{arg.ClientId}] QoS:{arg.ApplicationMessage.QualityOfServiceLevel} topic:{arg.ApplicationMessage.Topic}, 内容:{arg.ApplicationMessage.ConvertPayloadToString()}";
            AddLog(1, msg);
            return Task.FromResult(arg);
        }
        private Task MqttServer_StoppedAsync(EventArgs arg)
        {
            //服务停止事件
            string msg = $"服务停止";
            AddLog(1, msg);
            clients.Clear();
            return Task.FromResult(arg);
        }
        private Task MqttServer_StartedAsync(EventArgs arg)
        {
            //服务开启事件
            string msg = $"服务开启";
            AddLog(0, msg);
            return Task.FromResult(arg);
        }
     
        private void ck_UserPwd_CheckedChanged(object sender, EventArgs e)
        {
            txtUserName.Enabled = txtPwd.Enabled = ck_UserPwd.Checked;
        }
        void AddLog(int cate, string msg)
        {
            if (lstview_Note.InvokeRequired)
            {
                this.Invoke(new Action(() =>
                {
                    ListViewItem item = new ListViewItem();
                    item.ImageIndex = cate;
                    item.SubItems.Add(DateTime.Now.ToString("HH:mm:ss"));
                    item.SubItems.Add(msg);
                    lstview_Note.Items.Add(item);
                    lstview_Note.EnsureVisible(lstview_Note.Items.Count - 1);
                    toolStripStatusConnectCount.Text = clients.Count.ToString();
                }));
            }
            else
            {
                ListViewItem item = new ListViewItem();
                item.ImageIndex = cate;
                item.SubItems.Add(DateTime.Now.ToString("HH:mm:ss"));
                item.SubItems.Add(msg);
                lstview_Note.Items.Add(item);
                lstview_Note.EnsureVisible(lstview_Note.Items.Count - 1);
                toolStripStatusConnectCount.Text = clients.Count.ToString();
            }
           
           
        }
        private void btnCreateClient_Click(object sender, EventArgs e)
        {
            ClientFrm frm = new ClientFrm();
            frm.Show();
        }

        private void lst_Client_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (lst_Client.SelectedItem != null)
            {
                ClientItem item = lst_Client.SelectedItem as ClientItem;
                lst_Topic.DataSource = item.Topics.Select(a => $"Topic:{a.Topic},QoS:{a.QualityOfServiceLevel}").ToArray();
            }
        }
        /// <summary>
        /// 更新clientList 列表
        /// </summary>
        void UpdateClientList()
        {
            this.Invoke(new Action(() => {
                lst_Client.Items.Clear();
                foreach (var item in clients)
                {
                    lst_Client.Items.Add(item);
                }
                toolStripStatusConnectCount.Text = clients.Count.ToString();
            }));
          
           
        }
    }
 class ClientItem
    {
        public List<TopicItem> Topics { get; set; } = new List<TopicItem>();

        public string ClientID { get; set; }
        public string EndPoint { get; set; }
        public override string ToString()
        {
            return $"{ClientID};{EndPoint}";
        }

    }
    class TopicItem
    {
        public string Topic { get; set; }
        /// <summary>
        /// 服务质量级别,QoS0 (Almost One):至多一次,只发送一次,会发生消息丢失或重复。QoS1(Atleast Once): 至少一次,确保消息到达,但消息可能重复发送。QoS2(Exactly Once):只有一次,确保消息只到达一次。
        /// </summary>
        public MqttQualityOfServiceLevel QualityOfServiceLevel { get; set; }
    }

客户端

 public partial class ClientFrm : Form
    {
        Timer timer = new Timer();
        public ClientFrm()
        {
            InitializeComponent();
            timer.Interval = 500;
            timer.Tick += Timer_Tick;
            timer.Start();
            InitSetting();
        }
        private void Timer_Tick(object sender, EventArgs e)
        {
            toolStripStatusDateTime.Text = DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss");
        }
        void InitSetting()
        {
            //获取本机所有的IP4地址
            string[] ips = Dns.GetHostAddresses(Environment.MachineName).Where(item => !item.IsIPv6LinkLocal).Select(item => item.ToString()).ToArray();
            comboIp_List.DataSource = ips;
            txtPort.Text = "8000";
            txtUserName.Text = "sa";
            txtPwd.Text = "1";
            comboQoS.DataSource = Enum.GetNames(typeof(MQTTnet.Protocol.MqttQualityOfServiceLevel));
        }
        IMqttClient client;
        private void btnConnect_Click(object sender, EventArgs e)
        {
            //  txtClientId.Text = Guid.NewGuid().ToString();
            if (string.IsNullOrEmpty(txtClientId.Text.Trim()))
            {
                MessageBox.Show("ClientId不能为空!");
                return;
            }
            if (btnConnect.Text.Equals("连接"))
            {
                client = new MqttFactory().CreateMqttClient();
                MqttClientOptionsBuilder builder = new MqttClientOptionsBuilder()
                       .WithClientId(txtClientId.Text.Trim())
                       .WithCommunicationTimeout(TimeSpan.FromMilliseconds(50000))
                       .WithTcpServer(comboIp_List.Text.Trim(), Convert.ToInt32(txtPort.Text.Trim()));
                if (ck_UserPwd.Checked)
                {
                    builder.WithCredentials(txtUserName.Text.Trim(), txtPwd.Text.Trim());
                }
                IMqttClientOptions option = builder.Build();
                //消息接收事件
                client.ApplicationMessageReceivedHandler = new MqttApplicationMessageReceivedHandlerDelegate(Client_ApplicationMessageReceivedAsync);
                //客户端连接事件
                client.ConnectedHandler = new MqttClientConnectedHandlerDelegate(Client_ConnectedAsync);
               // client.UseConnectedHandler
                //客户端连接断开事件
                client.DisconnectedHandler = new MqttClientDisconnectedHandlerDelegate(Client_DisconnectedAsync);
               
                client.ConnectAsync(option);
               
            }
            else
            {
                client.DisconnectAsync().Wait();
                UpdateStatus(client.IsConnected);
                client.Dispose();
            }
        }
        private Task Client_DisconnectedAsync(MqttClientDisconnectedEventArgs arg)
        {
            //客户端断开事件
            string msg = $" 断开连接, 返回结果:{arg.Reason}";
            AddLog(1, msg);
            UpdateStatus(client.IsConnected);
            return Task.FromResult(arg);
        }
        private Task Client_ConnectedAsync(MqttClientConnectedEventArgs arg)
        {
            //客户端连接事件
            string msg = $"客户端ID 连接,结果:{arg.ConnectResult.ResultCode}";
            AddLog(0, msg);
            UpdateStatus(client.IsConnected);
            
            return Task.FromResult(arg);
        }
        private Task Client_ApplicationMessageReceivedAsync(MqttApplicationMessageReceivedEventArgs arg)
        {
            //客户端取消订阅事件
            string msg = $"消息ClientId:[{arg.ClientId}] , topic:[{arg.ApplicationMessage.Topic}], 内容:[{arg.ApplicationMessage.ConvertPayloadToString()}],QoS:[{arg.ApplicationMessage.QualityOfServiceLevel}]";
            AddLog(1, msg);
            return Task.FromResult(arg);
        }
        private void ck_UserPwd_CheckedChanged(object sender, EventArgs e)
        {
            txtUserName.Enabled = txtPwd.Enabled = ck_UserPwd.Checked;
        }
        void AddLog(int cate, string msg)
        {
            this.Invoke(new Action(() =>
            {
                ListViewItem item = new ListViewItem();
                item.ImageIndex = cate;
                item.SubItems.Add(DateTime.Now.ToString("HH:mm:ss"));
                item.SubItems.Add(msg);
                lstview_Note.Items.Add(item);
                lstview_Note.EnsureVisible(lstview_Note.Items.Count - 1);
            }));
        }
        private async void btnSubscribed_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrWhiteSpace(txtTopic.Text))
            {
                MessageBox.Show("主题不能为空!");
                return;
            }
            //主题订阅
            if (client?.IsConnected == true)
            {
                //QoS0 (Almost One):至多一次,只发送一次,会发生消息丢失或重复。
                //QoS1(Atleast Once): 至少一次,确保消息到达,但消息可能重复发送
                //QoS2(Exactly Once):只有一次:只有一次,确保消息只到达一次。
                var result = await client.SubscribeAsync(new MqttTopicFilter()
                {
                    QualityOfServiceLevel = (MqttQualityOfServiceLevel)Enum.Parse(typeof(MqttQualityOfServiceLevel), comboQoS.Text.Trim()),
                    Topic = txtTopic.Text.Trim()
                });
                StringBuilder sb = new StringBuilder();
                foreach (var item in result.Items)
                {
                    sb.AppendLine($"订阅主题:[{item.TopicFilter.Topic}],QoS:[{item.TopicFilter.QualityOfServiceLevel}],ReturnCode:[{item.ResultCode}]");
                }
                AddLog(0, sb.ToString());
            }
            else
            {
                MessageBox.Show("请先连接服务!");
            }
        }
        private async void btnPublish_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrWhiteSpace(txtMsgTopic.Text.Trim()))
            {
                MessageBox.Show("主题不能为空!");
                return;
            }
            //发布信息
            if (client?.IsConnected == true)
            {
                var result = await client.PublishAsync(new MqttApplicationMessage
                {
                    Topic = txtMsgTopic.Text.Trim(),
                    QualityOfServiceLevel = MqttQualityOfServiceLevel.ExactlyOnce,
                     Payload =Encoding.UTF8.GetBytes( txtMsgContent.Text.Trim())
                });
                string msg = $"发布消息:{txtMsgContent.Text} Topic:{txtMsgTopic.Text.Trim()} 结果:{result.ReasonCode}";
                AddLog(0, msg);
            }
            else
            {
                MessageBox.Show("请先连接服务!");
            }
        }
        void UpdateStatus(bool isConnected)
        {
            this.Invoke(new Action(() =>
            {
                if (!isConnected)
                {
                    btnConnect.Text = "连接";
                    btnConnect.BackColor = Color.Red;
                    comboIp_List.Enabled = txtPort.Enabled = true;
                }
                else
                {
                    btnConnect.Text = "断开";
                    btnConnect.BackColor = Color.Green;
                    comboIp_List.Enabled = txtPort.Enabled = false;
                }
            }));
          
        }

        private async void btnUnsubscribed_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrWhiteSpace(txtTopic.Text))
            {
                MessageBox.Show("主题不能为空!");
                return;
            }
            //主题订阅
            if (client?.IsConnected == true)
            {
                //QoS0 (Almost One):至多一次,只发送一次,会发生消息丢失或重复。
                //QoS1(Atleast Once): 至少一次,确保消息到达,但消息可能重复发送
                //QoS2(Exactly Once):只有一次:只有一次,确保消息只到达一次。
                var result = await client.UnsubscribeAsync(txtTopic.Text.Trim());
              
                StringBuilder sb = new StringBuilder();
                foreach (var item in result.Items)
                {
                    sb.AppendLine($"取消主题:[{item.TopicFilter}]订阅,ReturnCode:[{item.ReasonCode}]");
                }
                AddLog(0, sb.ToString());
            }
            else
            {
                MessageBox.Show("请先连接服务!");
            }
        }
    }

demo链接

https://download.csdn.net/download/lingxiao16888/89616009

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