fix(applications/vk_client):修正重连机制逻辑，同时添加超时重连判断

applications/VK_Client.c

@@ -152,22 +152,24 @@ int16_t client_tcp_connect(Cclient_t *client) {
   return rtn;
 }
 
+static rt_tick_t last_rx_tick = 0;
 int16_t client_yield(CLte_dev_t *pLte_dev) {
   int16_t rtn = 0;
 
   while (1) {
     if (lte_dev.client1->connect_sta == true) {
       rt_err_t ret = rt_sem_take(lte_dev.com_dev_rx_sem, 1000);
+      if (rt_tick_get() - last_rx_tick > RT_TICK_PER_SECOND * 10) {
+        rt_kprintf("timeout!!! reconnect.");
+        hw_printf("timeout!!! reconnect.");
+        pLte_dev->client1->connect_sta = false;
+      }
       if (RT_EOK == ret) {
         rt_ssize_t len = 0;
         while (1) {
+          rt_memset(lte_dev.at_buf, 0, sizeof(lte_dev.at_buf));
           len = rt_device_read(lte_dev.com_dev, 0, lte_dev.at_buf,
                                sizeof(lte_dev.at_buf));
-          rt_device_t fmu_com = fmu_com_get();
-          if (fmu_com) {
-            rt_device_write(fmu_com, 0, pLte_dev->at_buf, len);
-          }
-
           if (len > 0) {
             /*收到TCP关闭的消息*/
             if (strstr((const char *)lte_dev.at_buf, CLOSED)) {
@@ -176,22 +178,31 @@ int16_t client_yield(CLte_dev_t *pLte_dev) {
               if (NULL != strstr((char *)lte_dev.at_buf, cmd_str)) {
                 EC800K_Reset();
                 pLte_dev->client1->connect_sta = false;
+                break;
               }
-              return 1;
+              break;
             } else if (strstr((const char *)lte_dev.at_buf, "NO CARRIER")) {
               rt_kprintf("disconnect!!!");
+              hw_printf("disconnect!!!");
               pLte_dev->client1->connect_sta = false;
+              break;
             }
 
+            rt_device_t fmu_com = fmu_com_get();
+            if (fmu_com) {
+              rt_device_write(fmu_com, 0, pLte_dev->at_buf, len);
+            }
           }else{
             break;
           }
+          last_rx_tick = rt_tick_get();   
         }
       }
 
     } else {
       BSP_LTE_Config();
       client_tcp_connect(lte_dev.client1);
+      last_rx_tick = rt_tick_get();
     }
   }