feat: TCP Server 自动重启机制 — 3种超时条件

触发条件（任一满足即重启）:
1. 5分钟无任何连接 (从未连或上次连接后超时)
2. 5分钟无数据交互 (已连接但静默)
3. Auth 密码错误3次

重启流程: 关闭socket→清状态→重新SocketCreat+SocketListen
保护机制: 最多连续重启3次, 超限后进入10分钟冷却期

其他改动:
- tcp_json_srv_init 去掉 _init_done 限制, 支持重新初始化
- 新增 tcp_json_restart() 函数
- 新增 g_json_last_comm_ts / g_json_last_connect_ts 追踪
- CONNECT 时清零 restart_count (正常连接重置计数器)

vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/tcp_json_srv.h

@@ -22,6 +22,9 @@
 #define TCP_JSON_RECV_BUF_LEN       (TCP_JSON_MAX_FRAME * 2)
 #define TCP_JSON_MAX_PWD_RETRY      3             // Max password retries before lockout
 #define TCP_JSON_LOCKOUT_TIMEOUT_MS 60000         // 60s lockout after max retries
+#define TCP_JSON_IDLE_TIMEOUT_MS    300000        // 5min idle → restart (no connect / no comm)
+#define TCP_JSON_MAX_RESTART_COUNT  3             // Max auto-restart count
+#define TCP_JSON_RESTART_COOLDOWN_MS 600000       // 10min cooldown after max restarts
 
 /*===========================================================================
  * Auth / State
@@ -63,6 +66,10 @@ extern TcpJsonAuthState g_json_auth_state;
 extern uint32_t g_json_auth_timer;       // ms timer for auth timeout
 extern uint8_t  g_json_pwd_retry;        // password retry counter
 extern TcpJsonPending g_json_pending;    // Pending Loop MCU command state
+extern uint32_t g_json_last_comm_ts;     // Last communication timestamp (ms)
+extern uint32_t g_json_last_connect_ts;  // Last client connect timestamp (ms)
+extern uint8_t  g_json_restart_count;    // Auto-restart counter
+extern uint32_t g_json_restart_cooldown; // Cooldown deadline (ms)
 
 /*===========================================================================
  * API
@@ -71,5 +78,6 @@ void  tcp_json_srv_init(void);                  // Create listen socket on port
 void  tcp_json_handle_sock_int(uint8_t socketid, uint8_t intstat);  // Socket interrupt handler
 void  tcp_json_poll(void);                      // Periodic poll (auth timeout, etc.)
 void  tcp_json_push_sensor(void);               // Push sensor data (0xC0) to TCP client
+void  tcp_json_restart(void);                   // Close + reopen socket (auto-restart)
 
 #endif /* __TCP_JSON_SRV_H__ */