ABP .net Core MQTT+signalr通讯

abp版本： 4.3.0.0

.net core 版本 2.2

1、Mqtt

1.1 添加程序集：M2MqttDotnetCore（差点以为没有.net core 的）

2.2 实现代码：抄了个单例模式，并将服务器断开和消息接收事件委托给外层

public class MqttClientService
    {
        private IConfiguration _config;
        private static volatile MqttClientService _instance = null;

        private static readonly object LockHelper = new object();

        /// <summary>
        /// 创建单例模式
        /// </summary>
        public static MqttClientService CreateInstance(IConfiguration config)
        {
            if (_instance == null)
            {
                lock (LockHelper)
                {
                    if (_instance == null)
                        _instance = new MqttClientService(config);
                }
            }
            return _instance;
        }

        /// <summary>
        /// 实例化订阅客户端
        /// </summary>
        public MqttClient SubscribeClient { get; set; }

        public Action<Object, MqttMsgPublishEventArgs> ReceivedMsg { get; set; }
        public Action<object, EventArgs> ClosedCon;

        public MqttClientService(IConfiguration config)
        {
            _config = config;
            //生成客户端ID并连接服务器
            string ClientId = _config["MqttService:ClientId"];
            string HostIP = _config["MqttService:HostIP"];
            string Port= _config["MqttService:Port"];
            // create client instance
            SubscribeClient = new MqttClient(IPAddress.Parse(HostIP), int.Parse(Port), false, new X509Certificate(), new X509Certificate(), MqttSslProtocols.None);

            // 消息接收处理事件
            SubscribeClient.MqttMsgPublishReceived += client_MqttMsgPublishReceived;
            //与服务器断开事件
            SubscribeClient.ConnectionClosed += Client_ConnectionClosed;

            SubscribeClient.Connect(ClientId);

            // 在这里初始化订阅，从数据库取出所有需要订阅的设备信息，进行订阅
            // SubscribeClient.Subscribe(new string[] { "avatar/uploaded" }, new byte[] { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE });
        }

        void client_MqttMsgPublishReceived(object sender, MqttMsgPublishEventArgs e)
        {
            // handle message received
            ReceivedMsg?.Invoke(sender, e);
        }

        /// <summary>
        /// 与服务器断开
        /// </summary>
        private void Client_ConnectionClosed(object sender, EventArgs e)
        {
            ClosedCon?.Invoke(sender, e);
        }

        /// <summary>
        /// 发布
        /// </summary>
        /// <param name="Topic">发布的主题</param>
        /// <param name="Data">发布的消息内容</param>
        public void Publish(string Topic, string Data)
        {
            SubscribeClient.Publish(Topic, Encoding.UTF8.GetBytes(Data), MqttMsgBase.QOS_LEVEL_AT_MOST_ONCE, false);
        }

        /// <summary>
        /// 订阅
        /// </summary>
        /// <param name="Topic">订阅的主题</param>
        public void Subscribe(string[] Topic)
        {
            // 订阅主题"/home/temperature" 消息质量为 2(只有一次)
            SubscribeClient.Subscribe(Topic, new byte[] { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE });
        }

        /// <summary>
        /// 取消订阅
        /// </summary>
        public void Unsubscribe(string[] Topic)
        {
            SubscribeClient.Unsubscribe(Topic);
        }
    }

　　2.signalr，继承 AbpHubBase, ISingletonDependency（实现依赖注入的单例模式），这里只是为了做测试，所以代码有点丑

public class MqttHub : AbpHubBase, ISingletonDependency//AbpHubBase
    {
        // 使用GetByUserIdOrNull、GetAllClients和IsOnline方法 获取在线用户信息
        private readonly IOnlineClientManager _onlineClient;
        private readonly IConfiguration _config;
        public MqttHub(IConfiguration config,IOnlineClientManager onlineClient):base()
        {
            _config = config;
            _onlineClient = onlineClient;
        }

        static List<MqttUserModel> userList = new List<MqttUserModel>();
        /// <summary>
        /// 订阅 这个方法名字是自定义的。参数也是自定义的
        /// </summary>
        public async Task SubscribeMessage(string Topic)
        {
            MqttClientService service = MqttClientService.CreateInstance(_config);
            service.ReceivedMsg += MqttHelper_ReceivedMsg;
            service.ClosedCon += MqttHelper_ClosedCon;
            await Task.Run(() => service.Subscribe(new string[] { Topic }));
        }
        /// <summary>
        /// 取消订阅
        /// </summary>
        /// <param name="Topic"></param>
        public void Unsubscribe(string Topic)
        {
            MqttClientService service = MqttClientService.CreateInstance(_config);
            service.ReceivedMsg += MqttHelper_ReceivedMsg;
            service.ClosedCon += MqttHelper_ClosedCon;
            service.Unsubscribe(new string[] { Topic });
        }
        /// <summary>
        /// 发布
        /// </summary>
        /// <param name="Topic"></param>
        /// <param name="Data"></param>
        public void PublishMessage(string Topic, string Data)
        {
            MqttClientService service = MqttClientService.CreateInstance(_config);
            service.ReceivedMsg += MqttHelper_ReceivedMsg;
            service.ClosedCon += MqttHelper_ClosedCon;
            service.Publish(Topic, Data);//发布

            var clientConnectionId = Context.ConnectionId; //这是与我连接的客户端的连接ID（浏览器端）
        }
        /// <summary>
        /// 添加在线人员
        /// </summary>
        public void AddOnlineUser()
        {
            //直接从当前登录者信息里面取
            var user = userList.FirstOrDefault(x => x.Id == AbpSession.GetUserId());
            if (user == null)
            {
                //添加在线人员
                userList.Add(new MqttUserModel
                {
                    ConnectionId = Context.ConnectionId,
                    Id = AbpSession.GetUserId(),//随机用户id
                    UserName = AbpSession.GetUserName(),
                });
            }
            else
            {
                user.ConnectionId = Context.ConnectionId;
            }
            Clients.All.SendAsync("getMessage",new { msg = "当前登录用户:" + user.UserName + "\r\n" });

            var clientConnectionId = Context.ConnectionId; //这是与我连接的客户端的连接ID（浏览器端）
            Clients.Client(clientConnectionId).SendAsync("getMessage", new { msg = "您好，欢迎登陆！" });//指定接收者
        }
        /// <summary>
        ///
        /// </summary>
        private void MqttHelper_ClosedCon(object sender, EventArgs e)
        {
            Clients.All.SendAsync("getMessage", new { msg = "服务器已断开链接\r\n" });
        }
        /// <summary>
        /// 接收到服务器端的返回
        /// </summary>>
        private void MqttHelper_ReceivedMsg(object sender, MqttMsgPublishEventArgs e)
        {
            byte[] b = e.Message;
            string str = System.Text.Encoding.UTF8.GetString(b);

            //All表示监听所有连接上来的客户端。
            //getMessage是一个动态的方法，名字我们可以随意定的。这里我仅仅是给他取名叫getMessage而已,我们也可以叫Clients.All.ABC();
            Clients.All.SendAsync("getMessage", new { msg = str + "\r\n" });//调用所有连接上来的客户端（包括自己）监听的getMessage事件。All是一个dynamic属性，所以可以随意的监听
        }

        public void SendMessage(string message)
        {
            Clients.All.SendAsync("getMessage", new { msg = string.Format("User {0}: {1}", AbpSession.UserId, message) });
        }

        /// <summary>
        ///
        /// </summary>
        /// <returns></returns>
        public async override Task OnConnectedAsync()
        {
            await base.OnConnectedAsync();
            Logger.Debug("A client connected to MyChatHub: " + Context.ConnectionId);
        }

        /// <summary>
        /// 重写父类OnDisconnected方法 ：OnConnected方法客户端断开连接的时候会调用此方法
        /// </summary>
        /// <param name="exception"></param>
        /// <returns></returns>
        public async override Task OnDisconnectedAsync(Exception exception)
        {
            await base.OnDisconnectedAsync(exception);
            Logger.Debug("A client disconnected from MyChatHub: " + Context.ConnectionId);
        }

　　3、前端：

    <div class="layui-fluid">
        <div class="layui-col-sm3">
            <textarea id="TextArea1" rows="30" cols="900" style=" width:100%;height:100%;max-width:inherit;"></textarea>
        </div>
        <div class="layui-col-sm6">
            <h5>订阅测试</h5>
            @*<p>服务器地址：</p>
                <p><input id="txtIP" type="text" /></p>*@
            <p>订阅主题：</p>
            <p><input id="txtTopic" type="text" value="12/deviceStatus/12190101999" /></p>
            <p><input id="btnSubscribe" type="button" value="订阅" /><input id="btnSubscribeNo" type="button" value="取消订阅" /></p>
            <h5>发布测试</h5>
            <p>发布主题：</p>
            <p><input id="txtTopicPub" type="text" /></p>
            <p>发布内容</p>
            <p><textarea id="txtPublish" rows="10" cols="20" style=" width:100%;height:100%;max-width:inherit;"></textarea></p>
            <p><input id="btnPublic" type="button" value="发布" /></p>
            <input type="button" id="btn1" value="提交" />
        </div>
    </div>

　　4 JS

var chatHub = null;

            abp.signalr.startConnection(abp.appPath + 'signalr-mqttHub', function (connection) {
                chatHub = connection; // Save a reference to the hub

                connection.on('getMessage', function (message) { // Register for incoming messages
                    $("#TextArea1").text($("#TextArea1").text() + message.msg + "");
                    //console.log('received message: ' + message);
                });
            }).then(function (connection) {
                $("#TextArea1").text($("#TextArea1").text() + "连接MyHub成功\r\n");
                //abp.log.debug('Connected to mqttHub server!');
                abp.event.trigger('mqttHub.connected');
            });

            abp.event.on('mqttHub.connected', function () { // Register for connect event
                chatHub.invoke('sendMessage', "Hi everybody, I'm connected to the chat!"); // Send a message to the server
            });

            $("#btnSubscribe").click(function () {
                chatHub.invoke('subscribeMessage', $("#txtTopic").val());
            });

            $("#btnSubscribeNo").click(function () {
                chatHub.invoke('unsubscribe', $("#txtTopic").val());
            });

            $("#btnPublic").click(function () {
                chatHub.invoke('publishMessage', $("#txtPublish").val())
            });

　　5.Startup Configure

 app.UseSignalR(routes =>
            {
                routes.MapHub<AbpCommonHub>("/signalr");
                routes.MapHub<MqttHub>("/signalr-mqttHub"); // Prefix with '/signalr'
            });

　　原谅我写得太匆忙，15分钟居然没有写完，只能后面再补细节