diff --git a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c
index d5f051a..77216a0 100644
--- a/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c
+++ b/vd960DBN/BLE/OnlyUpdateApp_Peripheral/APP/iot_mqtt_srv.c
@@ -112,7 +112,7 @@ static int iot_mqtt_send_connect(void) {
     }
     PRINT("IOT: → CONNECT clientId=%s keepAlive=%d\n",
           opts.clientID.cstring, opts.keepAliveInterval);
-    return iot_mqtt_send(buf, (uint16_t)len);
+    return iot_mqtt_send(mqttBuf, (uint16_t)len);
 }
 
 /* 发送 MQTT SUBSCRIBE */