添加MQTT发送消息的功能

Services/Processors/MqttPublishProcessor.cs

@@ -0,0 +1,39 @@
+using System.Threading.Tasks;
+using PMSWPF.Models;
+
+namespace PMSWPF.Services.Processors
+{
+    /// <summary>
+    /// 负责将变量数据发布到MQTT的处理器。
+    /// </summary>
+    public class MqttPublishProcessor : IVariableProcessor
+    {
+        private readonly MqttBackgroundService _mqttBackgroundService;
+
+        public MqttPublishProcessor(MqttBackgroundService mqttBackgroundService)
+        {
+            _mqttBackgroundService = mqttBackgroundService;
+        }
+
+        /// <summary>
+        /// 处理单个变量上下文，如果有关联的MQTT配置，则将其推送到发送队列。
+        /// </summary>
+        /// <param name="context">包含变量及其元数据的上下文对象。</param>
+        public async Task ProcessAsync(VariableContext context)
+        {
+            var variable = context.Data;
+            if (variable?.VariableMqtts == null || variable.VariableMqtts.Count == 0)
+            {
+                return; // 没有关联的MQTT配置，直接返回
+            }
+
+            // 遍历所有关联的MQTT配置，并将其推入发送队列
+            foreach (var variableMqtt in variable.VariableMqtts)
+            {
+                // 确保VariableMqtt对象中包含了最新的Variable数据
+                variableMqtt.Variable = variable;
+                await _mqttBackgroundService.SendVariableAsync(variableMqtt);
+            }
+        }
+    }
+}