fix(vd960DBN): 删除重复 poll_mqtt 定义 + 加头文件声明

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

@@ -275,6 +275,7 @@ void dev_send_heartbeat(void);
 void dev_get_timestamp_send(void);
 void manage_tcp_message(uint8_t socket, uint8_t *buf, uint32_t len);
 void manage_mqtt_recv_message(char * msg, int length);
+void poll_mqtt(void);
 
 
 void GetMacAddr(unsigned char *pMAC);

vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/net_srv.c

@@ -423,29 +423,6 @@ void mqtt_data_manage(uint8_t id)
 
 
 
-/*********************************************************************
- * @fn      poll_mqtt
- *
- * @brief   MQTT 心跳轮询 — IoT 模式 (ref: DBN101GA)
- *
- * @return  none
- */
-void poll_mqtt(void)
-{
-    if (g_net_state.flag < 2) return;
-
-    static uint8_t _ping_counter = 0;
-    _ping_counter++;
-
-    if (_ping_counter >= 90) {   // ~9s (roughly, based on loop period)
-        _ping_counter = 0;
-        MQTT_Pingreq();
-        PRINT("MQTT PINGREQ\n");
-    }
-}
-
-
-
 /*********************************************************************
  * @fn      WCHNET_DataManage
  *