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-n_gsm.c GSM 0710 tty multiplexor HOWTO
-===================================================
-
-This line discipline implements the GSM 07.10 multiplexing protocol
-detailed in the following 3GPP document :
-http://www.3gpp.org/ftp/Specs/archive/07_series/07.10/0710-720.zip
-
-This document give some hints on how to use this driver with GPRS and 3G
-modems connected to a physical serial port.
-
-How to use it
--------------
-1- initialize the modem in 0710 mux mode (usually AT+CMUX= command) through
-its serial port. Depending on the modem used, you can pass more or less
-parameters to this command,
-2- switch the serial line to using the n_gsm line discipline by using
-TIOCSETD ioctl,
-3- configure the mux using GSMIOC_GETCONF / GSMIOC_SETCONF ioctl,
-
-Major parts of the initialization program :
-(a good starting point is util-linux-ng/sys-utils/ldattach.c)
-#include <linux/gsmmux.h>
-#define N_GSM0710 21 /* GSM 0710 Mux */
-#define DEFAULT_SPEED B115200
-#define SERIAL_PORT /dev/ttyS0
-
- int ldisc = N_GSM0710;
- struct gsm_config c;
- struct termios configuration;
-
- /* open the serial port connected to the modem */
- fd = open(SERIAL_PORT, O_RDWR | O_NOCTTY | O_NDELAY);
-
- /* configure the serial port : speed, flow control ... */
-
- /* send the AT commands to switch the modem to CMUX mode
- and check that it's successful (should return OK) */
- write(fd, "AT+CMUX=0\r", 10);
-
- /* experience showed that some modems need some time before
- being able to answer to the first MUX packet so a delay
- may be needed here in some case */
- sleep(3);
-
- /* use n_gsm line discipline */
- ioctl(fd, TIOCSETD, &ldisc);
-
- /* get n_gsm configuration */
- ioctl(fd, GSMIOC_GETCONF, &c);
- /* we are initiator and need encoding 0 (basic) */
- c.initiator = 1;
- c.encapsulation = 0;
- /* our modem defaults to a maximum size of 127 bytes */
- c.mru = 127;
- c.mtu = 127;
- /* set the new configuration */
- ioctl(fd, GSMIOC_SETCONF, &c);
-
- /* and wait for ever to keep the line discipline enabled */
- daemon(0,0);
- pause();
-
-4- create the devices corresponding to the "virtual" serial ports (take care,
-each modem has its configuration and some DLC have dedicated functions,
-for example GPS), starting with minor 1 (DLC0 is reserved for the management
-of the mux)
-
-MAJOR=`cat /proc/devices |grep gsmtty | awk '{print $1}`
-for i in `seq 1 4`; do
- mknod /dev/ttygsm$i c $MAJOR $i
-done
-
-5- use these devices as plain serial ports.
-for example, it's possible :
-- and to use gnokii to send / receive SMS on ttygsm1
-- to use ppp to establish a datalink on ttygsm2
-
-6- first close all virtual ports before closing the physical port.
-
-Additional Documentation
-------------------------
-More practical details on the protocol and how it's supported by industrial
-modems can be found in the following documents :
-http://www.telit.com/module/infopool/download.php?id=616
-http://www.u-blox.com/images/downloads/Product_Docs/LEON-G100-G200-MuxImplementation_ApplicationNote_%28GSM%20G1-CS-10002%29.pdf
-http://www.sierrawireless.com/Support/Downloads/AirPrime/WMP_Series/~/media/Support_Downloads/AirPrime/Application_notes/CMUX_Feature_Application_Note-Rev004.ashx
-http://wm.sim.com/sim/News/photo/2010721161442.pdf
-
-11-03-08 - Eric BĂ©nard - <eric@eukrea.com>