int main(void) {
int serial_fd, major;
struct termios tio;
int ldisc = N_GSM0710;
struct gsm_config gsm;
char atcommand[40];
/* print global parameters */
dbg("SERIAL_PORT = %s", SERIAL_PORT);
/* open the serial port */
serial_fd = open(SERIAL_PORT, O_RDWR | O_NOCTTY | O_NDELAY);
if (serial_fd == -1)
err(EXIT_FAILURE, "Cannot open %s", SERIAL_PORT);
/* get the current attributes of the serial port */
if (tcgetattr(serial_fd, &tio) == -1)
err(EXIT_FAILURE, "Cannot get line attributes");
/* set the new attrbiutes */
tio.c_iflag = 0;
tio.c_oflag = 0;
tio.c_cflag = CS8 | CREAD | CLOCAL;
// tio.c_cflag |= CRTSCTS;
tio.c_lflag = 0;
tio.c_cc[VMIN] = 1;
tio.c_cc[VTIME] = 0;
/* write the speed of the serial line */
if (cfsetospeed(&tio, LINE_SPEED) < 0 || cfsetispeed(&tio, LINE_SPEED) < 0)
err(EXIT_FAILURE, "Cannot set line speed");
/* write the attributes */
if (tcsetattr(serial_fd, TCSANOW, &tio) == -1)
err(EXIT_FAILURE, "Cannot set line attributes");
/**
* Send AT commands to put the modem in CMUX mode.
* This is vendor specific and should be changed
* to fit your modem needs.
* The following matches Quectel M95.
*/
// if (send_at_command(serial_fd, "AT+IFC=2,2\r") == -1)
// errx(EXIT_FAILURE, "AT+IFC=2,2: bad response");
if (send_at_command(serial_fd, "AT+GMM\r") == -1)
warnx("AT+GMM: bad response");
if (send_at_command(serial_fd, "AT\r") == -1)
warnx("AT: bad response");
if (send_at_command(serial_fd, "AT+IPR=38400\r") == -1)
errx(EXIT_FAILURE, "AT+IPR=38400: bad response");
sprintf(atcommand, "AT+CMUX=0,0,3,%d,10,3,30,10,2\r", MTU);
if (send_at_command(serial_fd, atcommand) == -1)
errx(EXIT_FAILURE, "Cannot enable modem CMUX");
/* use n_gsm line discipline */
sleep(2);
if (ioctl(serial_fd, TIOCSETD, &ldisc) < 0)
err(EXIT_FAILURE, "Cannot set line dicipline. Is 'n_gsm' module registred?");
/* get n_gsm configuration */
if (ioctl(serial_fd, GSMIOC_GETCONF, &gsm) < 0)
err(EXIT_FAILURE, "Cannot get GSM multiplex parameters");
/* set and write new attributes */
gsm.initiator = 1;
gsm.encapsulation = 0; /* 0 or 1, basic/advanced */
gsm.mru = MTU;
gsm.mtu = MTU;
gsm.t1 = 10;
gsm.n2 = 3;
gsm.t2 = 30;
gsm.t3 = 10;
if (ioctl(serial_fd, GSMIOC_SETCONF, &gsm) < 0)
err(EXIT_FAILURE, "Cannot set GSM multiplex parameters");
dbg("Line dicipline set");
/* create the virtual TTYs */
if (CREATE_NODES) {
int created;
if ((major = get_major(DRIVER_NAME)) < 0)
errx(EXIT_FAILURE, "Cannot get major number");
if ((created = make_nodes(major, BASENAME_NODES, NUM_NODES)) < NUM_NODES)
warnx("Cannot create all nodes, only %d/%d have been created.", created, NUM_NODES);
}
/* detach from the terminal if needed */
if (DAEMONIZE) {
dbg("Going to background");
if (daemon(0,0) != 0)
err(EXIT_FAILURE, "Cannot daemonize");
}
/* wait to keep the line discipline enabled, wake it up with a signal */
signal(SIGINT, signal_callback_handler);
signal(SIGTERM, signal_callback_handler);
pause();
/* remove the created virtual TTYs */
if (CREATE_NODES) {
remove_nodes(BASENAME_NODES, NUM_NODES);
}
/* close the serial line */
close(serial_fd);
return EXIT_SUCCESS;
}
void Student::info_student()
{
cout << "register number: " << get_register_no() << ", semester: " << get_semester() << ", major: " << get_major() << ", department: " << get_dept() << "\n\n";
}