diff --git a/applications/VK_Client.c b/applications/VK_Client.c
index a5f1482..6754ca2 100644
--- a/applications/VK_Client.c
+++ b/applications/VK_Client.c
@@ -292,11 +292,12 @@ int16_t client_yield(CLte_dev_t *pLte_dev) {
   while (1) {
     if (pLte_dev->client1->connect_sta == true) {
       rt_err_t ret = rt_sem_take(pLte_dev->com_dev_rx_sem, 1000);
-      // if (rt_tick_get() - last_rx_tick > RT_TICK_PER_SECOND * 10) {
-      //   rt_kprintf("timeout!!! reconnect.\n");
-      //   hw_printf("timeout!!! reconnect.\n");
-      //   pLte_dev->client1->connect_sta = false;
-      // }
+#ifdef EDU_TRAINING     
+      if (rt_tick_get() - last_rx_tick > RT_TICK_PER_SECOND * 6) {
+        LOG_I("timeout!!! reconnect.\n");
+        pLte_dev->client1->connect_sta = false;
+      }
+#endif
       if (RT_EOK == ret) {
         rt_ssize_t len = 0;
         while (1) {