初步完成Mqtt后台服务的改造

DMS.Infrastructure/Interfaces/Services/IMqttBackgroundService.cs

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+using DMS.Core.Models;
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace DMS.Infrastructure.Interfaces.Services
+{
+    /// <summary>
+    /// MQTT后台服务接口，负责管理MQTT连接和数据传输
+    /// </summary>
+    public interface IMqttBackgroundService
+    {
+        /// <summary>
+        /// 启动MQTT后台服务
+        /// </summary>
+        Task StartAsync(CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// 停止MQTT后台服务
+        /// </summary>
+        Task StopAsync(CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// 添加MQTT服务器配置
+        /// </summary>
+        void AddMqttServer(MqttServer mqttServer);
+
+        /// <summary>
+        /// 移除MQTT服务器配置
+        /// </summary>
+        Task RemoveMqttServerAsync(int mqttServerId, CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// 更新MQTT服务器配置
+        /// </summary>
+        void UpdateMqttServer(MqttServer mqttServer);
+
+        /// <summary>
+        /// 获取所有MQTT服务器配置
+        /// </summary>
+        IEnumerable<MqttServer> GetAllMqttServers();
+
+        /// <summary>
+        /// 发布变量数据到MQTT服务器
+        /// </summary>
+        Task PublishVariableDataAsync(VariableMqtt variableMqtt, CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// 发布批量变量数据到MQTT服务器
+        /// </summary>
+        Task PublishVariablesDataAsync(List<VariableMqtt> variableMqtts, CancellationToken cancellationToken = default);
+    }
+}

DMS.Infrastructure/Interfaces/Services/IMqttService.cs

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+using DMS.Core.Models;
+using MQTTnet.Client;
+using System;
+using System.Threading.Tasks;
+
+namespace DMS.Infrastructure.Interfaces.Services
+{
+    /// <summary>
+    /// MQTT服务接口，定义MQTT客户端的基本操作
+    /// </summary>
+    public interface IMqttService
+    {
+        /// <summary>
+        /// 获取MQTT客户端连接状态
+        /// </summary>
+        bool IsConnected { get; }
+
+        /// <summary>
+        /// 异步连接到MQTT服务器
+        /// </summary>
+        /// <param name="serverUrl">MQTT服务器URL</param>
+        /// <param name="port">端口号</param>
+        /// <param name="clientId">客户端ID</param>
+        /// <param name="username">用户名</param>
+        /// <param name="password">密码</param>
+        Task ConnectAsync(string serverUrl, int port, string clientId, string username, string password);
+
+        /// <summary>
+        /// 异步断开MQTT连接
+        /// </summary>
+        Task DisconnectAsync();
+
+        /// <summary>
+        /// 异步发布消息
+        /// </summary>
+        /// <param name="topic">主题</param>
+        /// <param name="payload">消息内容</param>
+        Task PublishAsync(string topic, string payload);
+
+        /// <summary>
+        /// 异步订阅主题
+        /// </summary>
+        /// <param name="topic">要订阅的主题</param>
+        Task SubscribeAsync(string topic);
+
+        /// <summary>
+        /// 设置消息接收处理程序
+        /// </summary>
+        /// <param name="handler">消息处理回调函数</param>
+        void SetMessageHandler(Func<string, string, Task> handler);
+    }
+}

DMS.Infrastructure/Interfaces/Services/IMqttServiceFactory.cs

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+using DMS.Core.Models;
+
+namespace DMS.Infrastructure.Interfaces.Services
+{
+    /// <summary>
+    /// MQTT服务工厂接口，用于创建MQTT服务实例
+    /// </summary>
+    public interface IMqttServiceFactory
+    {
+        /// <summary>
+        /// 创建MQTT服务实例
+        /// </summary>
+        /// <returns>IMqttService实例</returns>
+        IMqttService CreateService();
+
+        /// <summary>
+        /// 根据MQTT服务器配置创建MQTT服务实例
+        /// </summary>
+        /// <param name="mqttServer">MQTT服务器配置</param>
+        /// <returns>IMqttService实例</returns>
+        IMqttService CreateService(MqttServer mqttServer);
+    }
+}

DMS.Infrastructure/Interfaces/Services/IMqttServiceManager.cs

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+using DMS.Core.Models;
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace DMS.Infrastructure.Interfaces.Services
+{
+    /// <summary>
+    /// MQTT服务管理器接口，负责管理MQTT连接和变量监控
+    /// </summary>
+    public interface IMqttServiceManager
+    {
+        /// <summary>
+        /// 初始化服务管理器
+        /// </summary>
+        Task InitializeAsync(CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// 添加MQTT服务器到监控列表
+        /// </summary>
+        void AddMqttServer(MqttServer mqttServer);
+
+        /// <summary>
+        /// 移除MQTT服务器监控
+        /// </summary>
+        Task RemoveMqttServerAsync(int mqttServerId, CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// 更新MQTT服务器变量别名
+        /// </summary>
+        void UpdateVariableMqttAliases(int mqttServerId, List<VariableMqttAlias> variableMqttAliases);
+
+        /// <summary>
+        /// 获取MQTT服务器连接状态
+        /// </summary>
+        bool IsMqttServerConnected(int mqttServerId);
+
+        /// <summary>
+        /// 重新连接MQTT服务器
+        /// </summary>
+        Task ReconnectMqttServerAsync(int mqttServerId, CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// 获取所有监控的MQTT服务器ID
+        /// </summary>
+        IEnumerable<int> GetMonitoredMqttServerIds();
+
+        /// <summary>
+        /// 连接MQTT服务器
+        /// </summary>
+        Task ConnectMqttServerAsync(int mqttServerId, CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// 断开MQTT服务器连接
+        /// </summary>
+        Task DisconnectMqttServerAsync(int mqttServerId, CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// 发布变量数据到MQTT服务器
+        /// </summary>
+        Task PublishVariableDataAsync(VariableMqtt variableMqtt, CancellationToken cancellationToken = default);
+
+        /// <summary>
+        /// 发布批量变量数据到MQTT服务器
+        /// </summary>
+        Task PublishVariablesDataAsync(List<VariableMqtt> variableMqtts, CancellationToken cancellationToken = default);
+    }
+}