//close port

 {
if(fdDataPort != -1)
    {
    MSG_NOTICE("Closing AT[Data] port %d",fdDataPort);
    close (fdDataPort);
        MSG_NOTICE("Closed AT[Data] port",NULL);
        fdDataPort= -1;
    }
}

{
struct termios tio;
    memset(&tio, 0, sizeof(termios));

if ((fdDataPort = open("/dev/ttyUSB2", O_RDWR | O_NOCTTY| O_SYNC | O_NONBLOCK )) != -1)
{
    cfmakeraw (&tio);

    tio.c_iflag = 0;//IGNCR;
    tio.c_cflag |= CLOCAL | CREAD;
    usleep(200000);
    tcflush(fdDataPort, TCIOFLUSH);
    tcsetattr(fdDataPort, TCSANOW, &tio);
    tcflush(fdDataPort, TCIOFLUSH);
    tcflush(fdDataPort, TCIOFLUSH);
    cfsetospeed(&tio, B115200);
    cfsetispeed(&tio, B115200);
    tcsetattr(fdDataPort, TCSANOW, &tio);

    usleep(200000);

    return true;
}