diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/net_config.h b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/net_config.h
index 0a3c173..6b64ef8 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/net_config.h
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/net_config.h
@@ -36,7 +36,7 @@ extern "C" {
 /* The number of sockets, the maximum is 31  */
 #define WCHNET_MAX_SOCKET_NUM         (WCHNET_NUM_IPRAW+WCHNET_NUM_UDP+WCHNET_NUM_TCP+WCHNET_NUM_TCP_LISTEN)
 
-#define WCHNET_TCP_MSS                576   //1024  //1460  /* Size of TCP MSS*/
+#define WCHNET_TCP_MSS                700	//576   //1024  //1460  /* Size of TCP MSS*/
 
 #define WCHNET_NUM_POOL_BUF           (WCHNET_NUM_TCP*2+2)   /* The number of POOL BUFs, the number of receive queues */
 
diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/tcp_json_srv.h b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/tcp_json_srv.h
index 6e7c718..007ba48 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/tcp_json_srv.h
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/include/tcp_json_srv.h
@@ -17,7 +17,7 @@
  * Protocol Constants
  *===========================================================================*/
 #define TCP_JSON_PORT               5960          // TCP JSON protocol default port
-#define TCP_JSON_MAX_FRAME          4096          // Max JSON frame length
+#define TCP_JSON_MAX_FRAME          800 //4096          // Max JSON frame length
 #define TCP_JSON_AUTH_TIMEOUT_MS    60000         // 60s auth timeout (ms)
 #define TCP_JSON_RECV_BUF_LEN       (TCP_JSON_MAX_FRAME * 2)
 #define TCP_JSON_MAX_PWD_RETRY      3             // Max password retries before lockout