前置新增了装置心跳传输流程，每30秒自动发送一次心跳报文

LFtid1056/client2.h

@@ -44,6 +44,7 @@ enum class ConnectionState {
 // <20><><EFBFBD>ӵ<EFBFBD>״̬ö<CCAC><C3B6>
 enum class DeviceState {
     IDLE,                        // <20><><EFBFBD><EFBFBD>״̬
+    HEART_BEAT,                  // װ<><D7B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
     READING_STATS,               // <20><>ȡͳ<C8A1><CDB3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
     READING_STATS_TIME,          // <20><>ȡͳ<C8A1><CDB3>ʱ<EFBFBD><CAB1>
     READING_REALSTAT,            // <20><>ȡʵʱ<CAB5><CAB1><EFBFBD><EFBFBD>
@@ -83,6 +84,7 @@ public:
     ConnectionState state;
     int reconnect_attempts;
     volatile bool shutdown;
+    uint64_t heartbeat_time = 0;// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ʱʱ<CAB1><CAB1><EFBFBD><EFBFBD>
     uint64_t last_state_query_time_ = 0; // ͳ<><CDB3><EFBFBD><EFBFBD><EFBFBD>ݼ<EFBFBD>ʱʱ<CAB1><CAB1><EFBFBD><EFBFBD>
     uint64_t real_state_query_time_ = 0; // ʵʱ<CAB5><CAB1><EFBFBD>ݼ<EFBFBD>ʱʱ<CAB1><CAB1><EFBFBD><EFBFBD>
     std::atomic<int> real_state_count{ 0 };//ʵʱ<CAB5><CAB1><EFBFBD><EFBFBD><EFBFBD>շ<EFBFBD><D5B7><EFBFBD><EFBFBD><EFBFBD> ԭ<>Ӳ<EFBFBD><D3B2><EFBFBD><EFBFBD><EFBFBD>֤<EFBFBD>̰߳<DFB3>ȫ