diff --git a/applications/VK_Client.c b/applications/VK_Client.c
index 9f6b85e..d080632 100644
--- a/applications/VK_Client.c
+++ b/applications/VK_Client.c
@@ -8,6 +8,7 @@
 #include "rtthread.h"
 #include "rttypes.h"
 
+#define LINK_4G
 
 char cmd_cmd[100] = {0};
 char cmd_str[100] = {0};
@@ -128,6 +129,18 @@ int16_t client_tcp_connect(Cclient_t *client) {
 // Set_Tansparent_Mode(client);
 #endif
 
+#ifdef LINK_4G
+  char buf[128] = {0};
+  sprintf(buf, "{\"sn\":\"%s\",\"client_id\":\"%s\"}\r\n", lte_dev.iccid,
+          lte_dev.imei);
+
+  rt_device_write(lte_dev.com_dev, 0, buf, sizeof(buf));
+
+  rt_device_write(lte_dev.com_dev, 0, buf, sizeof(buf));
+
+  rt_device_write(lte_dev.com_dev, 0, buf, sizeof(buf));
+#endif
+
   return rtn;
 }