add:读不用改

app/port/luat_uart_air101.c

@@ -146,7 +146,6 @@ int luat_uart_read(int uartid, void *buffer, size_t length)
         return 0;
     }
     ret =  tls_uart_read(uartid,(u8 *) buffer,(u16)length);
-    ret = (ret == 0) ? length : 0;
     return ret;
 }