修复温度数据接收异常，添加心跳机制和连接管理

Windows/CS/Framework4.0/Toprie/Toprie/DeviceManager.cs

@@ -1129,10 +1129,11 @@ namespace JoyD.Windows.CS.Toprie
             byte[] buffer = new byte[65536]; // 缓冲区大小
             
             // 定义常量
-            const int RECEIVE_TIMEOUT = 5000;
+            const int RECEIVE_TIMEOUT = 30000; // 增加到30秒，减少因超时导致的断开
+            const int HEARTBEAT_INTERVAL = 15000; // 心跳间隔15秒
             const int MEDIUM_SLEEP_MS = 50;
-            const int LONG_SLEEP_MS = 1000;
+            const int LONG_SLEEP_MS = 2000; // 增加重连等待时间
-            const int ERROR_SLEEP_MS = 100;
+            const int ERROR_SLEEP_MS = 1000; // 增加异常恢复等待时间
             
             try
             {
@@ -1255,13 +1256,51 @@ namespace JoyD.Windows.CS.Toprie
                                 _isReceivingTemperatureData = true;
                             }
                             
+                            // 记录上次心跳时间和上次接收数据时间
+                            DateTime lastHeartbeatTime = DateTime.Now;
+                            DateTime lastReceiveTime = DateTime.Now;
+                            
                             // 持续读取温度数据流
-                            while (localTcpClient != null && localTcpClient.Connected && !isPaused)
+                            while (localTcpClient != null && localTcpClient.Connected)
                             {
-                                // 使用阻塞读取方式，等待数据到达
+                                // 检查是否暂停
+                                lock (_lockObject)
+                                {
+                                    isPaused = _isTemperatureReceivingPaused;
+                                }
+                                
+                                if (isPaused)
+                                {
+                                    Log("温度接收已暂停，等待恢复");
+                                    Thread.Sleep(MEDIUM_SLEEP_MS);
+                                    continue;
+                                }
+                                
+                                // 发送心跳保持连接
+                                if ((DateTime.Now - lastHeartbeatTime).TotalMilliseconds > HEARTBEAT_INTERVAL)
+                                {
+                                    try
+                                    {
+                                        byte[] heartbeatCommand = Encoding.ASCII.GetBytes("heartbeat\r\n");
+                                        localStream.Write(heartbeatCommand, 0, heartbeatCommand.Length);
+                                        localStream.Flush();
+                                        lastHeartbeatTime = DateTime.Now;
+                                        // 心跳不记录日志以减少日志量
+                                    }
+                                    catch (Exception ex)
+                                    {
+                                        Log($"发送心跳失败: {ex.Message}");
+                                    }
+                                }
+                                
+                                // 使用非阻塞方式检查是否有数据可读
+                                if (localStream.DataAvailable)
+                                {
+                                    // 有数据可读时进行阻塞读取
                                     int bytesRead = localStream.Read(buffer, 0, buffer.Length);
                                     if (bytesRead > 0)
                                     {
+                                        lastReceiveTime = DateTime.Now; // 更新最后接收数据时间
                                         byte[] receivedBytes = new byte[bytesRead];
                                         Array.Copy(buffer, receivedBytes, bytesRead);
                                         Log($"接收到温度数据字节数: {bytesRead}");
@@ -1281,7 +1320,7 @@ namespace JoyD.Windows.CS.Toprie
                                             }
                                         }
                                     }
-                                else
+                                    else if (bytesRead == 0)
                                         {
                                             // 连接已关闭
                                             Log("远程主机关闭了连接");
@@ -1305,6 +1344,7 @@ namespace JoyD.Windows.CS.Toprie
                                             continue;
                                         }
                                     }
+                            }                            
                             // while循环退出后的处理
                         }
                         catch (Exception ex)