Gsmmux Save

GSM 07.10 Driver Implementation with pseudo-tty's

Copyright (C) 2003 Tuukka Karvonen [email protected] Modified 2004/2005 by David Jander [email protected] Development continued in Berlios GSM Multiplexer Daemon project

Introduction

This driver is based on the work of Tuukka Karvonen, (see README.orig) and has been modified to work with pseudo-tty's instead. This is far from complete. Please refer to README.orig for more information about the GSM07.10 implementation. The driver is known to work with the following modems:

• Sony-Ericsson GM29
• Siemens MC35
• Siemens MC35i
• Siemens MC75
• iRZ MC52iT
• Sony-Ericsson GM47/GM48 (not tested with the most recent version of the driver)

Instructions for Use

./gsmMuxd [options] ... <ptyN> : pty devices (e.g. /dev/ptya0, or /dev/ptmx)

options: -p : Serial port device to connect to [/dev/modem] -f : Maximum frame size [32] -d : Debug mode, don't fork -m : Modem (mc35, mc75, generic, ...) -b : MUX mode baudrate (0,9600,14400, ...) -P <PIN-code> : PIN code to fed to the modem -s : Prefix for the symlinks of slave devices (e.g./dev/mux) -w : Wait for deamon startup success/failure -h : Show this help message

This daemon divides one serial port into two or more "virtual" serial ports (pseudo TTYs) assuming the modem supports the GSM 07.10 multiplexer protocol. This way the first virtual serial port can be used for e.g. GPRS dialup connection with pppd, while the other ports are used for modem AT commands.

The daemon takes the pseudo TTY master devices to-be-used as parameter. The corresponding pseudo TTY slave devices will become the virtual serial ports.

On some systems, there is only one master pseudo TTY device, the "/dev/ptmx". In this case, the slave TTYs will be named /dev/pts/0, /dev/pts/1, etc and the names of the virtual serial ports are not static. To solve the problem, the daemon can create symbolic links with static names to the dynamically changing virtual serial port pseudo TTY slave devices.

INSTALLATION

To make the daemon start at system boot:

1. Copy gsmMuxd to /usr/sbin/
2. Copy the file "mux.d" to /etc/init.d/.
3. Edit the OPTIONS line of the copied file
4. Run chkconfig --add mux.d

If you have more than one modem you will need to create a copy of the daemon executable with a different name and create another init script to /etc/init.d/.

Note that installation varies on different systems. The steps above should work at least on Red Hat linux distributions.