diff --git a/mbtk/libgsw_lib/gsw_uart_interface.c b/mbtk/libgsw_lib/gsw_uart_interface.c
index d16fa69..e09aefd 100755
--- a/mbtk/libgsw_lib/gsw_uart_interface.c
+++ b/mbtk/libgsw_lib/gsw_uart_interface.c
@@ -13,6 +13,8 @@
 
 #include "gsw_uart_interface.h"
 
+#define MODEM_CONNECT_MCU_PORT      "/dev/ttyS1"
+
 #ifndef LOG_ERR_LEVEL
 #define LOG_ERR_LEVEL  3      /* error conditions */
 #endif
@@ -138,9 +140,6 @@
     return GSW_HAL_SUCCESS;
 }
 
-
-
-
 int32_t gsw_uart_open_ex(int8_t *port, gsw_hal_uart_baudrate baudrate, uint32_t bits, int8_t parity, uint32_t stop)
 {
     if (handle())
@@ -303,7 +302,7 @@
     return fd;
 }
 
-void gsw_uart_flush(int fd)
+void gsw_uart_flush(int32_t fd)
 {
     if (handle())
         return;
@@ -317,7 +316,6 @@
     //return GSW_HAL_SUCCESS;
 }
 
-
 int gsw_uart_read(int fd, unsigned char *buffer, int len, int timeout_ms)
 {
     if (handle())
@@ -407,9 +405,6 @@
     return GSW_HAL_SUCCESS;
 }
 
-
-
-
 void gsw_uart_close(int fd)
 {
     if (handle())
@@ -434,3 +429,7 @@
     //return GSW_HAL_SUCCESS;
 }
 
+int gsw_uart_open(unsigned int baudrate,  unsigned int bits, char parity, unsigned int stop)
+{
+    return gsw_uart_open_ex((int8_t *)MODEM_CONNECT_MCU_PORT, (gsw_hal_uart_baudrate)baudrate, bits, parity, stop);
+}