diff --git a/applications/VK_Client.c b/applications/VK_Client.c
index 64ad0b4..0e3d569 100644
--- a/applications/VK_Client.c
+++ b/applications/VK_Client.c
@@ -9,6 +9,7 @@
 #include "rtthread.h"
 #include "rttypes.h"
 
+#ifdef EDU_TRAINING
 #if defined(__CC_ARM) && !defined(__clang__)
 #define VK_MAVLINK_DO_PRAGMA(x) _Pragma(#x)
 #define __pragma(x) VK_MAVLINK_DO_PRAGMA(x)
@@ -22,22 +23,25 @@
 #undef __pragma
 #undef VK_MAVLINK_DO_PRAGMA
 #endif
+#endif
 
 #define DBG_TAG "LINK_LOG"
 #define DBG_LVL DBG_INFO
 #include "rtdbg.h"
 
 
-char cmd_cmd[100] = {0};
-char cmd_str[100] = {0};
+static char cmd_cmd[128] = {0};
 
 no_carrier_match_t _no_carrier_t = {0};
 
 /*关闭TCP连接*/
 void client_tcp_close(Cclient_t *client) {
+  char close_cmd[24];
+
   client->connect_sta = false;
-  rt_sprintf(cmd_str, AT_QICLOSE, client->connect_ID);
-  BSP_LTE_SendCmd(cmd_str, DEFAULT_EXPECT, DEFAULT_ERROR, LTE_CMD_WAIT_QICLOSE);
+  rt_snprintf(close_cmd, sizeof(close_cmd), AT_QICLOSE, client->connect_ID);
+  BSP_LTE_SendCmd(close_cmd, DEFAULT_EXPECT, DEFAULT_ERROR,
+                  LTE_CMD_WAIT_QICLOSE);
   client->error_cnt = 0;
 }
 
@@ -130,10 +134,8 @@ static int no_carrier_char_parser(uint8_t ch){
 }
 
 static void no_carrier_match(uint8_t * at_buf,rt_size_t len){
-  uint8_t buff[256] = {0};
-  rt_memcpy(buff, at_buf, len);
   for(int i = 0;i < len;i++){
-    if(no_carrier_char_parser(buff[i]) == 1){
+    if(no_carrier_char_parser(at_buf[i]) == 1){
       _no_carrier_t.match_flag = COMPLETE_MATCH;
     }
   }
@@ -230,36 +232,8 @@ int16_t EC800K_Reset(void) {
   return rst;
 }
 
-/*将EC800K为透传模式*/
-// int16_t Set_Tansparent_Mode(Cclient_t *pClient)
-//{
-//    int AT_QISWTMD_error_count = 0;
-//    /*如果socket成功打开，则将它设置为透传模式*/
-//    if(pClient->connect_sta == true)
-//    {
-//       /*打开透传模式*/
-//       memset(cmd_cmd, 0, sizeof(cmd_cmd));
-//       sprintf(cmd_cmd, AT_QISWTMD, pClient->connect_ID, 2);
-//       while(0 != BSP_LTE_SendCmd( cmd_cmd, CONNECTE_OK, DEFAULT_ERROR,
-//       LTE_CMD_WAIT_LONG ))
-//       {
-//          //rt_thread_mdelay(1000);
-//
-//          if(AT_QISWTMD_error_count++ > 5)
-//          {
-//             EC800K_Reset();
-//
-//             rt_thread_mdelay(3000);
-//
-//             break;
-//          }
-//       }
-//    }
-//
-//    return 0;
-// }
-
 int16_t client_tcp_connect(Cclient_t *client) {
+  int cmd_len;
   int16_t rtn = 0;
 
   if (lte_dev.config_sta == false)
@@ -299,9 +273,14 @@ int16_t client_tcp_connect(Cclient_t *client) {
   
   // 2, 打开链接
   memset(cmd_cmd, 0, sizeof(cmd_cmd));
-  memset(cmd_str, 0, sizeof(cmd_str));
-  rt_sprintf(cmd_cmd, AT_QIOPEN_TRANS /*AT_QIOPEN_FORW*/, client->connect_ID,
-          client->mode, client->ip, client->port);
+  cmd_len = rt_snprintf(cmd_cmd, sizeof(cmd_cmd), AT_QIOPEN_TRANS,
+                        client->connect_ID, client->mode, client->ip,
+                        client->port);
+  if (cmd_len < 0 || cmd_len >= (int)sizeof(cmd_cmd)) {
+    LOG_E("QIOPEN command is too long");
+    lte_diag.qioopen_failures++;
+    return -1;
+  }
   /* 透传模式成功返回 CONNECT；一次尝试只发送一次 QIOPEN。 */
   while (0 != BSP_LTE_SendCmd(cmd_cmd, CONNECTE_OK, DEFAULT_ERROR,
                               LTE_CMD_WAIT_QIOPEN)) {
@@ -328,10 +307,6 @@ int16_t client_tcp_connect(Cclient_t *client) {
   client->error_cnt = 0;
   lte_dev.reset_flag = DTU_CF_NO_NEED_RESET;
 
-#ifdef TRANSPARENT_MODE
-// Set_Tansparent_Mode(client);
-#endif
-
 #ifdef EDU_TRAINING
   mavlink_message_t msg = {0};
   uint8_t mav_buf[MAVLINK_MAX_PACKET_LEN] = {0};
@@ -492,9 +467,6 @@ void client_yield(CLte_dev_t *pLte_dev) {
 }
 
 void client_task(void) {
-  if (lte_dev.config_sta == false) {
-  }
-
   client_yield(&lte_dev);
 }
 
diff --git a/applications/drv_ec800k.c b/applications/drv_ec800k.c
index 709e1a8..1e45526 100644
--- a/applications/drv_ec800k.c
+++ b/applications/drv_ec800k.c
@@ -19,29 +19,16 @@
 
 
 Cclient_t client1 = {
-    .valid = true,
     .mode = "TCP",
     /*教培IP和PORT*/
     .ip = "uavedu.jiagutech.com",
     .port = "19763",
-
-    // /*中国透传域名*/
-    // .ip = "gitlab.jiagutech.com",
-    // /*韩国透传域名*/
-    // .ip = "8.220.247.132",
-    // /*泰国透传域名*/
-    // .ip = "ag-th.jiagutech.com",
-
-    // .port = "8027",
-
     .connect_ID = 0,
     .connect_sta = false,
     .error_cnt = 0,
 };
 
 CLte_dev_t lte_dev = {
-    .contextID = 1,
-    .deviceEnable = true,
     .client1 = (Cclient_t *)&client1,
     .config_sta = false,
     .reset_flag = DTU_CF_NEED_RESET,
@@ -147,35 +134,6 @@ void BSP_LTE_SetDataTxPaused(bool paused) {
   }
 }
 
-int16_t BSP_LTE_CipSend(uint8_t *pdata, uint32_t length, uint32_t waittime) {
-  BSP_LTE_SendData(pdata, length);
-
-  rt_err_t ret = rt_sem_take(lte_dev.com_dev_rx_sem, waittime);
-  if (ret == RT_EOK) {
-    rt_thread_mdelay(500);
-
-    rt_memset(lte_dev.at_buf, 0, sizeof(lte_dev.at_buf));
-
-    rt_ssize_t read_len = rt_device_read(lte_dev.com_dev, 0, lte_dev.at_buf,
-                                         sizeof(lte_dev.at_buf));
-    if (read_len > 0) {
-      lte_diag_uart2_rx((rt_size_t)read_len);
-    }
-
-    /* 清空缓存 */
-    uint8_t c;
-    while (rt_device_read(lte_dev.com_dev, 0, &c, 1) == 1) {
-    }
-
-    if (NULL != rt_strstr((char *)lte_dev.at_buf, CIPSEND_SUCCESS))
-      return 0;
-    else
-      return 1;
-  } else {
-    return 0;
-  }
-}
-
 int16_t BSP_LTE_SendCmd(const char *cmd, const char *expect, const char *error,
                         uint32_t waittime) {
   lte_diag_at_begin(cmd);
@@ -216,17 +174,6 @@ int16_t BSP_LTE_SendCmd(const char *cmd, const char *expect, const char *error,
   }
 }
 
-int16_t BSP_LTE_SendDataAT(uint8_t *pdata, uint32_t length) {
-  int16_t res = 0;
-  char cmd_str[128] = {0};
-  rt_sprintf(cmd_str, AT_CIPSEND, 0, length);
-  if (0 == BSP_LTE_SendCmd(cmd_str, TPOK, DEFAULT_ERROR, LTE_CMD_WAIT_NORMAL)) {
-    res = BSP_LTE_CipSend(pdata, length, LTE_CMD_WAIT_LONG);
-  } else
-    res = -1;
-  return res;
-}
-
 int16_t BSP_LTE_SendATE(int16_t retry) {
   do {
     if (0 == BSP_LTE_SendCmd(AT_ATE0, DEFAULT_EXPECT, DEFAULT_ERROR,
@@ -239,8 +186,6 @@ int16_t BSP_LTE_SendATE(int16_t retry) {
   return -1;
 }
 
-// char tmp_imei[16] = "001068000000006";
-// char tmp_imei_2[16] = "869455062043381";
 int extract_number(const char *src, char *dest) {
   if(src == RT_NULL || dest == RT_NULL){
     return -1;
@@ -317,40 +262,7 @@ int BSP_LTE_GetICCID(char *pICCID) {
   return ret;
 }
 
-int16_t BSP_LTE_GetCGATT(int16_t retry) {
-  do {
-    if (0 ==
-        BSP_LTE_SendCmd(AT_CGATT, CGATT_OK, DEFAULT_ERROR, LTE_CMD_WAIT_LONG)) {
-      return 0;
-    }
-    retry--;
-  } while (retry);
-  //rt_kprintf("PS detached:[%s]", lte_dev.at_buf);
-  return -1;
-}
-
 #define CSQ_CMD_RESP "+CSQ:"
-// int BSP_LTE_GetCSQ(void) {
-//   int ret = -1;
-  
-
-//   if (0 == BSP_LTE_SendCmd(AT_CSQ, DEFAULT_EXPECT, DEFAULT_ERROR,
-//                            LTE_CMD_WAIT_LONG)) {
-
-//     char *start, *end , *temp= NULL;
-//     start = rt_strstr((const char *)lte_dev.at_buf, CSQ_CMD_RESP) +
-//             rt_strlen(CSQ_CMD_RESP);
-//     end = start;
-//     while (*end != ',')
-//       end++;
-//     rt_size_t len = end - start;
-//     rt_memcpy(temp,start,len);
-//     temp[len] = '\0';
-//     ret = atoi(temp);
-//   }
-//   return ret;
-// }
-
 int8_t BSP_LTE_GetCSQ(void) {
   int8_t ret = 0;
   char *start;
@@ -459,10 +371,7 @@ void BSP_LTE_Config(void) {
   }
   /*查询SIM卡是否存在*/
   res = BSP_LTE_SendATCPIN(3);
-  if (res == 0)
-    lte_dev.sim_inserted = true;
-  else if (res == 1) {
-    lte_dev.sim_inserted = false;
+  if (res == 1) {
     return;
   }
 
diff --git a/applications/drv_ec800k.h b/applications/drv_ec800k.h
index 3d6d5ae..7e5b9dc 100644
--- a/applications/drv_ec800k.h
+++ b/applications/drv_ec800k.h
@@ -209,24 +209,8 @@ extern "C" {
  * application-level silence recovery and leaves NO CARRIER/keepalive active. */
 #define LTE_SERVER_SILENCE_TIMEOUT_SEC (15)
 
-// #define GSM_BT_LIVE		5*60*1000			// 5min
-typedef struct _connect_state {
-  bool connected;
-  int16_t error_cnt;
-  //	bool is_net_closed;
-} connect_state_t;
-
-typedef struct _lte_base_station_ifno {
-  int mcc;
-  int mnc;
-  int lac;
-  int cellid;
-} __attribute__((packed)) lte_base_station_info_t;
-
 typedef struct {
-  bool valid;
   char mode[4];
-  //	char domain_name[128];
   char ip[50];
   char port[16];
   bool connect_sta;
@@ -292,21 +276,16 @@ void lte_diag_disconnect(lte_disconnect_reason_t reason);
 void lte_diag_module_reset(void);
 
 typedef struct {
-  char hard_ver[32];
   char imei[32];
-  bool sim_inserted;
   char iccid[32];
 
   uint8_t eps_sta;
   int8_t csq;
 
-  uint8_t contextID;  // 场景ID。范围：1~15。
   bool config_sta;
 
   Cclient_t *client1;
 
-  bool deviceEnable;
-
   rt_device_t com_dev;
   rt_sem_t com_dev_rx_sem;
   rt_mutex_t data_tx_mutex;
@@ -334,61 +313,20 @@ enum {
   COMPLETE_MATCH = 2,
 };
 
-//////////////////////////////////////////////////////////////////////////////////////////
-bool isICCIDValid(char *str);
-
-bool isIMEIValid(char *str);
-
-int8_t BSP_LTE_GetCPSI(void);
-
-void BSP_L505_WaitReady(uint16_t second);
-
-void BSP_LTE_WaitReady(uint16_t second);
-
-void BSP_LTE_PwrOn(void);
-
-void BSP_LTE_PwrOff(void);
-
-void BSP_LTE_ResetByKey(void);
-
 void BSP_LTE_SendData(uint8_t *pdata, uint32_t length);
 void BSP_LTE_SetDataTxPaused(bool paused);
 
-int16_t BSP_LTE_SendDataAT(uint8_t *pdata, uint32_t length);
-
 void BSP_LTE_Config(void);
 
 int BSP_LTE_GetICCID(char *pICCID);
 
-int16_t BSP_LTE_GetBsInfo(int *lte_mcc, int *lte_mnc, int *lte_lac,
-                          int *lte_cellid);
-
 int8_t BSP_LTE_GetCSQ(void);
 
-uint32_t BSP_LTE_GetTimeMs(void);
-
-int16_t BSP_LTE_GetGTPOS_GET(int *lon, int *lat);
-
-void BSP_LTE_TCP_Close(void);
-
 int16_t BSP_LTE_SendCmd(const char *cmd, const char *expect, const char *error,
                         uint32_t waittime);
 
-int16_t BSP_LTE_TCP_Connect(const char *mode, const char *ipAddr,
-                            const char *port);
-
-void BSP_LTE_MQTT_Close(void);
-
 void BSP_LET_Register_Com(rt_device_t com_dev);
 
-int16_t BSP_LTE_Send_Cmd_HTTPRead(const char *cmd, uint16_t len,
-                                  int32_t waittime);
-
-int16_t BSP_LTE_Send_Cmd_FileRead(const char *cmd, uint16_t len,
-                                  int32_t waittime);
-
-void tcp_connect_test(void);
-
 
 #ifdef __cplusplus
 }