diff --git a/applications/user_sys.h b/applications/user_sys.h
index 1b549da..793c1c1 100644
--- a/applications/user_sys.h
+++ b/applications/user_sys.h
@@ -19,7 +19,7 @@
 
 
 #define SYS_HW_VERSION           (0X13U)
-#define SYS_SW_VERSION           (0X20U)
+#define SYS_SW_VERSION           (0X21U)
 #define SYS_IOT_UPLOAD_CYCLE_MIN (0X003CU) // 高位在后，低位在前
 #define SYS_IOT_RETRY            (0X03U)
 #define SYS_TEMP_ALARM_THRESHOLD (0X32U)
diff --git a/bsp/src/at_device_ml307.c b/bsp/src/at_device_ml307.c
index 363bf8f..61a56d8 100644
--- a/bsp/src/at_device_ml307.c
+++ b/bsp/src/at_device_ml307.c
@@ -413,36 +413,37 @@ static int ml307_check_link_status(struct at_device *device)
         return -RT_ERROR;
     }
 
-    // if(at_obj_exec_cmd(device->client, resp, "AT+MIPCALL?") < 0)
+    if (at_obj_exec_cmd (device->client, resp, "AT+CEREG?") == RT_EOK)
+    {
+
+        if (at_resp_parse_line_args_by_kw (resp, "+CEREG:", "+CEREG: %*d,%d", &link_stat) > 0)
+        {
+            if ((link_stat != 1) && (link_stat != 5))
+            {
+                ml307_conncet_tcp_flag = 0;
+                ml307_connect_sever_flag = 0;
+                rt_sem_release(ml307_disconnect_sem);
+            }
+        }
+    }
+    // link_stat = 0;
+
+    // if(at_obj_exec_cmd(device->client, resp, "AT+CGACT?") < 0)
     // {
     //     result = -RT_ERROR;
     //     goto __exit;
     // }
-
-    // if (at_resp_parse_line_args_by_kw(resp, "+MIPCALL:", "+MIPCALL: %d,%*d,%*s", &link_stat) > 0)
+    // //+CGACT: 1,1
+    // if (at_resp_parse_line_args_by_kw(resp, "+CGACT:", "+CGACT: %d,%*d", &link_stat) > 0)
     // {
-    //     if (link_stat == 1)
-    //     {
-    //         result = RT_EOK;
-    //     }
+    //     result = link_stat;
     // }
+// __exit:
 
-    if(at_obj_exec_cmd(device->client, resp, "AT+CGACT?") < 0)
-    {
-        result = -RT_ERROR;
-        goto __exit;
-    }
-    //+CGACT: 1,1
-    if (at_resp_parse_line_args_by_kw(resp, "+CGACT:", "+CGACT: %d,%*d", &link_stat) > 0)
-    {
-        result = link_stat;
-    }
-__exit:
-
-    if(resp)
-    {
+//     if(resp)
+//     {
         at_delete_resp(resp);
-    }
+    // }
 
     return(result);
 }
@@ -537,7 +538,7 @@ static void ml307_check_link_status_entry(void *parameter)
 #define ML307_LINK_DELAY_TIME  (60 * RT_TICK_PER_SECOND)
 
     at_response_t resp = RT_NULL;
-    int link_status;
+    // int link_status;
     struct at_device *device = RT_NULL;
     struct netdev *netdev = (struct netdev *)parameter;
 
@@ -556,17 +557,17 @@ static void ml307_check_link_status_entry(void *parameter)
     }
     while(1)
     {
-        link_status = ml307_check_link_status(device);//固定时间检查连接状态
-        if(link_status < 0)
-        {
-            rt_thread_mdelay(ML307_LINK_DELAY_TIME);
-            continue;
-        }
-        /* check the network interface device link status  */
-        if ((ML307_LINK_STATUS_OK == link_status) != netdev_is_link_up(netdev))
-        {
-            netdev_low_level_set_link_status(netdev, (ML307_LINK_STATUS_OK == link_status));
-        }
+        ml307_check_link_status(device);//固定时间检查连接状态
+        // if(link_status < 0)
+        // {
+        //     rt_thread_mdelay(ML307_LINK_DELAY_TIME);
+        //     continue;
+        // }
+        // /* check the network interface device link status  */
+        // if ((ML307_LINK_STATUS_OK == link_status) != netdev_is_link_up(netdev))
+        // {
+        //     netdev_low_level_set_link_status(netdev, (ML307_LINK_STATUS_OK == link_status));
+        // }
 
         rt_thread_mdelay(ML307_LINK_DELAY_TIME);
     }
diff --git a/bsp/src/bsp_flash.c b/bsp/src/bsp_flash.c
index 82e022d..92b44e8 100644
--- a/bsp/src/bsp_flash.c
+++ b/bsp/src/bsp_flash.c
@@ -915,7 +915,7 @@ int BSP_Flash_Init (void)
             LOG_D ("Flash_Set_Sever_Data error!");
         }
 
-        Flash_SetProductTimeLimit (2025, 6, 11, 11, 50, 20, kFactoryTimeId);
+        Flash_SetProductTimeLimit (2025, 6, 25, 11, 50, 20, kFactoryTimeId);
         Set_ExpirationTime (MAX_EXPIRATION_DAYS);
         // TODO:标定标志
         Flash_Set_Calibration_State(kNotCalibrated); // 标定状态
diff --git a/bsp/src/bsp_ml307.c b/bsp/src/bsp_ml307.c
index 7bf2a06..fd866b0 100644
--- a/bsp/src/bsp_ml307.c
+++ b/bsp/src/bsp_ml307.c
@@ -1954,7 +1954,7 @@ static void Ml307_Life_Thread_Entry (void *parameter)
     rt_err_t result = RT_ETIMEOUT;
     rt_uint32_t delay_n = 0;
     at_response_t resp = RT_NULL;
-    
+
     LOG_D ("ml307_life_thread entry\n");
 
     while (1)
@@ -2140,6 +2140,7 @@ static void Ml307_Life_Thread_Entry (void *parameter)
                             delay_n = 0;
                             ml307_disconnect_retry_flag = 0;
                             at_delete_resp (resp);
+                            rt_sem_control (ml307_disconnect_sem, RT_IPC_CMD_RESET, 0);
                             retry_delay = 8000;  // 重置重连延迟时间
                             rt_thread_mdelay (100);
                             Ml307_Send_Event (kMl307HeartbeatEvent);