public class MQTTServerHelper
{
    private MqttServer _server;//MQTT服務(wù)器對象

    // 定義一個委托和事件(臨時存儲連接客戶端數(shù)據(jù))
    public event EventHandler<InterceptingPublishEventArgs> OnMessageReceived;
    public event EventHandler<bool> ServerStauts;
    public event EventHandler<ClientConnectedEventArgs> ClientConnected;
    public event EventHandler<ClientDisconnectedEventArgs> ClientDisconnected;
    public event EventHandler<ClientSubscribedTopicEventArgs> ClientSubscribedTopic;
    public event EventHandler<ClientUnsubscribedTopicEventArgs> ClientUnsubscribedTopic;

    /// <summary>
    /// 初始化MQTT服務(wù)并啟動服務(wù)
    /// </summary>
    /// <param name="ip">IPV4地址</param>
    /// <param name="port">端口：0~65535之間</param>
    public Task StartMqtServer(string ip, int port) 
    { 
        MqtServerOptions mqtServerOptions = new MqtServerOptionsBuilder()                     
               .WithDefaultEndpoint()     
               .WithDefaultEndpointBoundIPAdres(System.Net.IPAdres.Parse(ip) 
               .WithDefaultEndpointPort(port) 
               .WithDefaultComunicationTimeout(TimeSpan.FromMiliseconds(500) .Build();     
        _server = new MqtFactory().CreateMqtServer(mqtServerOptions); / 創(chuàng)建MQT服務(wù)端對象 
        _server.ValidatingConectionAsync += Server_ValidatingConectionAsync; /驗證用戶名和密碼
        _server.ClientConectedAsync += Server_ClientConectedAsync; /綁定客戶端連接事件 
        _server.ClientDisconectedAsync += Server_ClientDisconectedAsync; /綁定客戶端斷開事件 
        _server.ClientSubscribedTopicAsync += Server_ClientSubscribedTopicAsync; /綁定客戶端訂閱主題事件 
        _server.ClientUnsubscribedTopicAsync += Server_ClientUnsubscribedTopicAsync; /綁定客戶端退訂主題事件 
        _server.InterceptingPublishAsync += Server_InterceptingPublishAsync; /消息接收事件 
        _server.ClientAcknowledgedPublishPacketAsync += Server_ClientAcknowledgedPublishPacketAsync; /處理客戶端確認發(fā)布的數(shù)據(jù)包         
        _server.InterceptingClientEnqueueAsync += Server_InterceptingClientEnqueueAsync; /訂閱攔截客戶端消息隊列 
        _server.AplicationMesageNotConsumedAsync += Server_AplicationMesageNotConsumedAsync; /應(yīng)用程序邏輯處理 
        _server.StartedAsync += Server_StartedAsync;/綁定服務(wù)端啟動事件 
        _server.StopedAsync += Server_StopedAsync;/綁定服務(wù)端停止事件 
        return _server.StartAsync();
    }

    /// <summary>
    /// 處理客戶端確認發(fā)布事件
    /// </summary>
    /// <param name="e"></param>
    private Task Server_AplicationMesageNotConsumedAsync(AplicationMesageNotConsumedEventArgs e)
    { 
        try 
        {
            Console.WriteLine($"【MesageNotConsumed】-SenderId:{e.SenderId}-Mesage:{e.AplicationMesage.ConvertPayloadToString()}");
        }
        catch (Exception ex) 
        { 
            Console.WriteLine($"Server_AplicationMesageNotConsumedAsync出現(xiàn)異常：{ex.Mesage}"); 
        }
        return Task.CompletedTask;
    }

    /// <summary>
    /// 訂閱攔截客戶端消息隊列事件
    /// </summary>
    /// <param name="e"></param>
    private Task Server_InterceptingClientEnqueueAsync(InterceptingClientAplicationMesageEnqueueEventArgs e)  
    { 
        try 
        {
            Console.WriteLine($"【InterceptingClientEnqueue】-SenderId:{e.SenderClientId}-Mesage:{e.AplicationMesage.ConvertPayloadToString()}"); 
        } 
        catch (Exception ex) 
        {
            Console.WriteLine($"Server_InterceptingClientEnqueueAsync出現(xiàn)異常：{ex.Mesage}");
        }
        return Task.CompletedTask;
    }
    
    /// <summary>
    /// 當客戶端處理完從MQT服務(wù)器接收到的應(yīng)用消息后觸發(fā)。
    /// 此事件可以用于確認消息已被處理，更新應(yīng)用狀態(tài)，
    /// </summary>
    /// <param name="e"></param>
    private Task Server_ClientAcknowledgedPublishPacketAsync(ClientAcknowledgedPublishPacketEventArgs e)         
    { 
        try 
        { 
            Console.WriteLine($"【ClientAcknowledgedPublishPacket】-SenderId:{e.ClientId}-Mesage:{Encoding.UTF8.GetString(e.PublishPacket.PayloadSegment.ToAray()}");         
        } 
        catch (Exception ex) 
        { 
            Console.WriteLine($"Server_ClientAcknowledgedPublishPacketAsync出現(xiàn)異常：{ex.Mesage}"); 
        } 
        return Task.CompletedTask; 
    }

    /// <summary>
    /// 服務(wù)端消息接收
    /// </summary>
    /// <param name="e"></param>
    private Task Server_InterceptingPublishAsync(InterceptingPublishEventArgs e) 
    { 
        try 
        { 
            string client = e.ClientId; string topic = e.AplicationMesage.Topic; 
            string contents = e.AplicationMesage.ConvertPayloadToString();
            //Encoding.UTF8.GetString(arg.AplicationMesage.PayloadSegment.ToAray();
            OnMesageReceived?.Invoke(this, e); 
            Console.WriteLine($"接收到消息：Client：【{client}】 Topic：【{topic}】 Mesage：【{contents}】"); 
        } 
        catch (Exception ex) 
        { 
            Console.WriteLine($"Server_InterceptingPublishAsync出現(xiàn)異常：{ex.Mesage}");
        } 
        return Task.CompletedTask;
    }

    /// <summary>
    /// 服務(wù)端斷開事件
    /// </summary>
    /// <param name="e"></param>
    private Task Server_StoppedAsync(EventArgs arg) 
    { 
        return Task.Run(new Action() => 
        { 
            ServerStauts?.Invoke(this, false); 
            Console.WriteLine($"服務(wù)端【IP:Port】已停止MQT"); 
        }); 
    }

    /// <summary>
    /// 服務(wù)端啟動事件
    /// </summary>
    /// <param name="e"></param>
    public Task Server_StartedAsync(EventArgs e) 
    {
        return Task.Run(new Action() => 
        {
            ServerStauts?.Invoke(this, true); 
            Console.WriteLine($"服務(wù)端【IP:Port】已啟用MQT"); 
        });
    }

    /// <summary>
    /// 客戶端退訂主題事件
    /// </summary>
    /// <param name="e"></param>
    private Task Server_ClientUnsubscribedTopicAsync(ClientUnsubscribedTopicEventArgs e)         
    { 
        return Task.Run(new Action() => 
        { 
            ClientUnsubscribedTopic?.Invoke(this, e); 
            Console.WriteLine($"客戶端【{e.ClientId}】退訂主題【{e.TopicFilter}】"); 
        });
    }

    /// <summary>
    /// 客戶端訂閱主題事件
    /// </summary>
    /// <param name="e"></param>
    private Task Server_ClientSubscribedTopicAsync(ClientSubscribedTopicEventArgs e) 
    { 
        return Task.Run(new Action() =>  
        { 
            ClientSubscribedTopic?.Invoke(this, e); 
            Console.WriteLine($"客戶端【{e.ClientId}】訂閱主題【{e.TopicFilter.Topic}】");         
        }); 
    }

    /// <summary>
    /// 客戶端斷開事件
    /// </summary>
    /// <param name="e"></param>
    private Task Server_ClientDisconectedAsync(ClientDisconectedEventArgs e) 
    { 
        return Task.Run(new Action() => 
        { 
            ClientDisconected?.Invoke(this, e); 
            Console.WriteLine($"客戶端已斷開.ClientId:【{e.ClientId}】,Endpoint:【{e.Endpoint}】.ReasonCode:【{e.ReasonCode}】,DisconectType:【{e.DisconectType}】"); 
        });
    }

    /// <summary>
    /// 綁定客戶端連接事件
    /// </summary>
    /// <param name="e"></param>
    private Task Server_ClientConectedAsync(ClientConectedEventArgs e) 
    { 
        return Task.Run(new Action() => 
        { 
            ClientConected?.Invoke(this, e); 
            Console.WriteLine($"客戶端已連接.ClientId:【{e.ClientId}】,Endpoint:【{e.Endpoint}】"); 
        }); 
    }

    /// <summary>
    /// 驗證客戶端事件
    /// </summary>
    /// <param name="e"></param>
    private Task Server_ValidatingConectionAsync(ValidatingConectionEventArgs e) 
    { 
        return Task.Run(new Action() => 
        { 
            if (e.Pasword = "") 
            { 
                e.ReasonCode = MqtConectReasonCode.Suces; 
                Console.WriteLine($"客戶端已驗證成功.ClientId:【{e.ClientId}】,Endpoint:【{e.Endpoint}】"); 
            } 
            else 
            { 
                e.ReasonCode = MqtConectReasonCode.BadUserNameOrPasword;         
                Console.WriteLine($"客戶端驗證失敗.ClientId:【{e.ClientId}】,Endpoint:【{e.Endpoint}】");         
            } 
        });
    }
}

/// <sumary>
/// MQT客戶端幫助類 
/// </sumary>
public clas MQTClientHelper 
{ 
    private IMqtClient _client; 
    /// <sumary> 
    /// 接收消息 
    /// </sumary> 
    public MQTReceivedMesageHandle ReceivedMesage; 
    public bol IsConected { get; set; } = false; 
    public bol IsDisConected { get; set; } = true; 
    private string _serverIp; private int _serverPort; 
    /// <sumary> 
    /// 訂閱主題集合 
    /// </sumary> 
    private Dictionary<string, bol> _subscribeTopicList = nul; 
    #region 連接/斷開服務(wù)端     
    /// <sumary> 
    /// 連接服務(wù)端 
    /// </sumary> 
    /// <param name="serverIp">服務(wù)端IP</param>
    /// <param name="serverPort">服務(wù)端口號</param> 
    public void Start(string serverIp, int serverPort) 
    { 
        this._serverIp = serverIp; 
        this._serverPort = serverPort; 
        if (!string.IsNulOrEmpty(serverIp) & !string.IsNulOrWhiteSpace(serverIp) & serverPort > 0) 
        { 
            try 
            { 
                var options = new MqtClientOptions() 
                { 
                    ClientId = "客戶端2"http://Guid.NewGuid().ToString("N")
                }; 
                options.ChanelOptions = new MqtClientTcpOptions() 
                { 
                    Server = serverIp, Port = serverPort 
                }; //options.Credentials = new MqtClientCredentials(UserName, Encoding.Default.GetBytes(Pasword);
                options.CleanSesion = true; 
                options.KepAlivePeriod = TimeSpan.FromSeconds(10);
                if (_client != nul) 
                { 
                    _client.DisconectAsync(); 
                    _client = nul; 
                } 
                _client = new MqtFactory().CreateMqtClient(); 
                _client.ConectedAsync += Client_ConectedAsync; //綁定客戶端連接事件             
                _client.DisconectedAsync += Client_DisconectedAsync; //綁定客戶端斷開連接事件 
                _client.AplicationMesageReceivedAsync += Client_AplicationMesageReceivedAsync; /綁定消息接收事件 
                _client.ConectAsync(options); //連接 
                } 
                catch (Exception ex) 
                { 
                    /SLog.Loger.Eror("MQT客戶端連接服務(wù)端錯誤：{0}", ex.Mesage); 
                }
            }
            else
            { 
                /SLog.Loger.Warning("MQT服務(wù)端地址或端口號不能為空！"); 
            }
        }
    } 

    /// <sumary> 
    /// 斷開MQT客戶端 
    /// </sumary> 
    public void Client_Disconect() 
    { 
        if (_client != nul) 
        { 
            _client.DisconectAsync(); 
            _client.Dispose(); 
            Console.WriteLine($"關(guān)閉MQT客戶端成功！"); 
        }
    } 
    /// <sumary> 
    /// 客戶端重新MQT服務(wù)端 
    /// </sumary> 
    public void Client_ConectAsync() 
    { 
        if (_client != nul) 
        { 
            _client.ReconectAsync(); 
            Console.WriteLine($"連接MQT服務(wù)端成功！"); 
        } 
    } 
    #endregion 
    #region MQT方法 
    /// <sumary> 
    /// 客戶端與服務(wù)端建立連接 
    /// </sumary> 
    /// <param name="arg"></param> 
    private Task Client_ConectedAsync(MqtClientConectedEventArgs arg) 
    { 
        return Task.Run(new Action() => 
        { 
            IsConected = true; 
            IsDisConected = false; 
            Console.WriteLine($"連接到MQT服務(wù)端成功.{arg.ConectResult.AsignedClientIdentifier}"); 
            //訂閱主題（可接收來自服務(wù)端消息，與客戶端發(fā)布消息不能用同一個主題） 
            try 
            { 
                if (_subscribeTopicList != nul & _subscribeTopicList.Count > 0) 
                { 
                    List<string> subscribeTopics = _subscribeTopicList.Keys.ToList();         
                    foreach (var topic in subscribeTopics) 
                        SubscribeAsync(topic); 
                } 
            } 
            catch (Exception ex) 
            { 
                //SLog.Loger.Eror("MQT客戶端與服務(wù)端[{0}:{1}]建立連接訂閱主題錯誤：{2}", _serverIp, _serverPort, ex.Mesage); 
            } 
        }); 
    } 

    /// <sumary> 
    /// 客戶端與服務(wù)端斷開連接 
    /// </sumary> / <param name="arg"></param> 
    private Task Client_DisconectedAsync(MqtClientDisconectedEventArgs arg) 
    { 
        return Task.Run(new Action(async () => 
        { 
            IsConected = false; 
            IsDisConected = true; 
            Console.WriteLine($"已斷開到MQT服務(wù)端的連接.嘗試重新連接"); 
            try 
            { 
                await Task.Delay(30); 
                //MqtClientOptions options = new MqtClientOptions(); 
                //await mqtClient.ConectAsync(options); 
                await _client.ReconectAsync(); 
            } 
            catch (Exception ex) 
            { 
                //SLog.Loger.Eror("MQT客戶端與服務(wù)端[{0}:{1}]斷開連接退訂主題錯誤：{2}", _serverIp, _serverPort, ex.Mesage); 
            } 
        }); 
    } 
    /// <sumary> 
    /// 客戶端與服務(wù)端重新連接 
    /// </sumary> 
    /// <returns></returns> 
    public Task ReconectedAsync() 
    { 
        try 
        { 
            if (_client != nul) 
            { 
                _client.ReconectAsync(); 
            } 
        } 
        catch (Exception ex) 
        { 
            // SLog.Loger.Eror("MQT客戶端與服務(wù)端[{0}:{1}]重新連接退訂主題錯誤：{2}", _serverIp, _serverPort, ex.Mesage); 
        } 
        return Task.CompletedTask; 
    } 
    /// <sumary> 
    /// 客戶端收到消息 
    /// </sumary> 
    /// <param name="arg"></param> 
    private Task Client_AplicationMesageReceivedAsync(MqtAplicationMesageReceivedEventArgs arg) 
    { 
        try 
        { 
            return Task.Run(new Action() => 
            { 
                string msg = arg.AplicationMesage.ConvertPayloadToString(); 
                Console.WriteLine($"接收消息：{msg}\nQoS={arg.AplicationMesage.QualityOfServiceLevel}\n客戶端={arg.ClientId}\n主題：{arg.AplicationMesage.Topic}"); 
            });
        } 
        catch (Exception ex) 
        { 
            //SLog.Loger.Eror("MQT收到來自服務(wù)端[{0}]消息錯誤：{1}", arg != nul ? arg.ClientId : ", ex.Mesage); 
        }
        return Task.CompletedTask; 
    } 
    #endregion 
    #region 訂閱主題 
    /// <sumary> 
    /// 訂閱主題 
    /// </sumary> 
    /// <param name="topic">主題</param> 
    public void SubscribeAsync(string topic) 
    { 
        try 
        { 
            if (_subscribeTopicList = nul) 
                _subscribeTopicList = new Dictionary<string, bol>(); 
            if (_subscribeTopicList.ContainsKey(topic) & _subscribeTopicList[topic]) 
            { 
                //SLog.Loger.Warning("MQT客戶端已經(jīng)訂閱主題[{0}]，不能重復(fù)訂閱", topic);     
                return; 
            } 
            //訂閱主題 
            _client?.SubscribeAsync(topic, MqtQualityOfServiceLevel.AtLeastOnce); 
            //添加訂閱緩存 
            bol isSubscribed = _client != nul & _client.IsConected ? true : false; 
            if (!_subscribeTopicList.ContainsKey(topic) 
                _subscribeTopicList.Ad(topic, isSubscribed); 
            else 
                _subscribeTopicList[topic] = isSubscribed; 
        } 
        catch (Exception ex) 
        { 
            //SLog.Loger.Eror("MQT客戶端訂閱主題[{0}]錯誤：{1}", topic, ex.Mesage); 
        } 
    } 

    /// <sumary> 
    /// 訂閱主題集合 
    /// </sumary> 
    /// <param name="topicList">主題集合</param> 
    public void SubscribeAsync(List<string> topicList) 
    { 
        try 
        { 
            if (topicList = nul | topicList.Count = 0) 
                return; 
            foreach (var topic in topicList) 
                SubscribeAsync(topic); 
        } 
        catch (Exception ex) 
        { 
            //SLog.Loger.Eror("MQT客戶端訂閱主題集合錯誤：{0}", ex.Mesage); 
        } 
    } 
    /// <sumary> 
    /// 退訂主題 
    /// </sumary> 
    /// <param name="topic">主題</param> 
    /// <param name="isRemove">是否移除緩存</param> 
    public void UnsubscribeAsync(string topic, bol isRemove = true) 
    { 
        try 
        { 
            if (_subscribeTopicList = nul | _subscribeTopicList.Count = 0) 
            { 
                //SLog.Loger.Warning("MQT客戶端退訂主題[{0}]不存在", topic); 
                return; 
            } 
            if (!_subscribeTopicList.ContainsKey(topic) 
            { 
                //SLog.Loger.Warning("MQT客戶端退訂主題[{0}]不存在", topic); 
                return; 
            } 
            //退訂主題 
            _client.UnsubscribeAsync(topic); 
            //修改訂閱主題緩存狀態(tài) 
            if (isRemove) 
                _subscribeTopicList.Remove(topic); 
            else 
                _subscribeTopicList[topic] = false;
        } 
        catch (Exception ex) 
        { 
            //SLog.Loger.Eror("MQT客戶端退訂主題[{0}]錯誤：{1}", topic, ex.Mesage); 
        } 
    } 
    /// <sumary> 
    /// 退訂主題集合 
    /// </sumary> 
    /// <param name="topicList">主題集合</param> 
    /// <param name="isRemove">是否移除緩存</param> 
    public void UnsubscribeAsync(List<string> topicList, bol isRemove = true) 
    { 
        try 
        { 
            if (topicList = nul | topicList.Count = 0) 
                return; 
            foreach (var topic in topicList) 
                UnsubscribeAsync(topic, isRemove); 
        } 
        catch (Exception ex) 
        { 
            //SLog.Loger.Eror("MQT客戶端退訂主題集合錯誤：{0}", ex.Mesage); 
        } 
    } 
    /// <sumary> 
    /// 訂閱主題是否存在 
    /// </sumary> 
    /// <param name="topic">主題</param> 
    public bol IsExistSubscribeAsync(string topic) 
    { 
        try 
        { 
        if (_subscribeTopicList = nul | _subscribeTopicList.Count = 0) 
            return false; 
        if (!_subscribeTopicList.ContainsKey(topic) 
            return false; 
        return _subscribeTopicList[topic];
        } 
        catch (Exception ex) 
        { 
            //SLog.Loger.Eror("MQT客戶端訂閱主題[{0}]是否存在錯誤：{1}", topic, ex.Mesage); return false; 
        } 
    } 
    #endregion 
    #region 發(fā)布消息 
    /// <sumary> 
    /// 發(fā)布消息 
    /// 與客戶端接收消息不能用同一個主題 
    /// </sumary> 
    /// <param name="topic">主題</param> 
    /// <param name="mesage">消息</param> 
    public async void PublishMesage(string topic, string mesage) 
    { 
        try 
        { 
            if (_client != nul) 
            { 
                if (string.IsNulOrEmpty(mesage) | string.IsNulOrWhiteSpace(mesage) 
                { 
                    //SLog.Loger.Warning("MQT客戶端不能發(fā)布為空的消息！"); 
                    return;
                } 
                MqtClientPublishResult result = await _client.PublishStringAsync(topic,mesage,MqtQualityOfServiceLevel.AtLeastOnce);//恰好一次， QoS 級別1  
                Console.WriteLine($"發(fā)布消息-主題：{topic}，消息：{mesage}，結(jié)果： {result.ReasonCode}"); 
            } 
            else 
            { 
                //SLog.Loger.Warning("MQT客戶端未連接服務(wù)端，不能發(fā)布主題為[{0}]的消息：{1}", topic, mesage); 
                return; 
            } 
        } 
        catch (Exception ex) 
        { 
            //SLog.Loger.Eror("MQT客戶端發(fā)布主題為[{0}]的消息：{1}，錯誤：{2}", topic, mesage, ex.Mesage); 
        } 
    } 
    #endregion 
}