int
set_line(int speed)
{
    struct termios   tio;
    memcpy(&tio, &line_tio, sizeof(tio));
    tcgetattr(line_fd, &tio);     /* Get the current attributes of the Serial port */
    cfsetispeed(&tio,B9600); /* Set Read  Speed as 9600                       */
    cfsetospeed(&tio,B9600); /* Set Write Speed as 9600                       */
    cfmakeraw(&tio);
    //tio.c_cflag |= CREAD | CLOCAL;
    tio.c_cc[VTIME] = 0; /* Wait indefinetly   */
   // tio.c_cc[VMIN]  = 1;

    if (tcsetattr(line_fd, TCSAFLUSH, &tio) != 0)
        return (-1);
    sleep(1);
    tcflush(line_fd, TCIOFLUSH);
    return (0);
}