+++ /dev/null
-==============================
-GSM 0710 tty multiplexor HOWTO
-==============================
-
-This line discipline implements the GSM 07.10 multiplexing protocol
-detailed in the following 3GPP document:
-
- https://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. config initiator
-^^^^^^^^^^^^^^^^^^^^^
-
-1.1 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.
-
-1.2 switch the serial line to using the n_gsm line discipline by using
- TIOCSETD ioctl.
-
-1.3 configure the mux using GSMIOC_GETCONF / GSMIOC_SETCONF ioctl.
-
-1.4 obtain base gsmtty number for the used serial port.
-
-Major parts of the initialization program :
-(a good starting point is util-linux-ng/sys-utils/ldattach.c)::
-
- #include <stdio.h>
- #include <stdint.h>
- #include <linux/gsmmux.h>
- #include <linux/tty.h>
- #define DEFAULT_SPEED B115200
- #define SERIAL_PORT /dev/ttyS0
-
- int ldisc = N_GSM0710;
- struct gsm_config c;
- struct termios configuration;
- uint32_t first;
-
- /* 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);
- /* get first gsmtty device node */
- ioctl(fd, GSMIOC_GETFIRST, &first);
- printf("first muxed line: /dev/gsmtty%i\n", first);
-
- /* and wait for ever to keep the line discipline enabled */
- daemon(0,0);
- pause();
-
-1.5 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
-
-1.6 first close all virtual ports before closing the physical port.
-
- Note that after closing the physical port the modem is still in multiplexing
- mode. This may prevent a successful re-opening of the port later. To avoid
- this situation either reset the modem if your hardware allows that or send
- a disconnect command frame manually before initializing the multiplexing mode
- for the second time. The byte sequence for the disconnect command frame is::
-
- 0xf9, 0x03, 0xef, 0x03, 0xc3, 0x16, 0xf9.
-
-2. config requester
-^^^^^^^^^^^^^^^^^^^^^
-
-2.1 receive string "AT+CMUX= command" through its serial port,initialize
- mux mode config
-
-2.2 switch the serial line to using the n_gsm line discipline by using
- TIOCSETD ioctl.
-
-2.3 configure the mux using GSMIOC_GETCONF / GSMIOC_SETCONF ioctl.
-
-2.4 obtain base gsmtty number for the used serial port::
-
- #include <stdio.h>
- #include <stdint.h>
- #include <linux/gsmmux.h>
- #include <linux/tty.h>
- #define DEFAULT_SPEED B115200
- #define SERIAL_PORT /dev/ttyS0
-
- int ldisc = N_GSM0710;
- struct gsm_config c;
- struct termios configuration;
- uint32_t first;
-
- /* open the serial port */
- fd = open(SERIAL_PORT, O_RDWR | O_NOCTTY | O_NDELAY);
-
- /* configure the serial port : speed, flow control ... */
-
- /* get serial data and check "AT+CMUX=command" parameter ... */
-
- /* use n_gsm line discipline */
- ioctl(fd, TIOCSETD, &ldisc);
-
- /* get n_gsm configuration */
- ioctl(fd, GSMIOC_GETCONF, &c);
- /* we are requester and need encoding 0 (basic) */
- c.initiator = 0;
- 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);
- /* get first gsmtty device node */
- ioctl(fd, GSMIOC_GETFIRST, &first);
- printf("first muxed line: /dev/gsmtty%i\n", first);
-
- /* and wait for ever to keep the line discipline enabled */
- daemon(0,0);
- pause();
-
-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 Bénard - <eric@eukrea.com>
--- /dev/null
+==============================
+GSM 0710 tty multiplexor HOWTO
+==============================
+
+This line discipline implements the GSM 07.10 multiplexing protocol
+detailed in the following 3GPP document:
+
+ https://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. config initiator
+^^^^^^^^^^^^^^^^^^^^^
+
+1.1 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.
+
+1.2 switch the serial line to using the n_gsm line discipline by using
+ TIOCSETD ioctl.
+
+1.3 configure the mux using GSMIOC_GETCONF / GSMIOC_SETCONF ioctl.
+
+1.4 obtain base gsmtty number for the used serial port.
+
+Major parts of the initialization program :
+(a good starting point is util-linux-ng/sys-utils/ldattach.c)::
+
+ #include <stdio.h>
+ #include <stdint.h>
+ #include <linux/gsmmux.h>
+ #include <linux/tty.h>
+ #define DEFAULT_SPEED B115200
+ #define SERIAL_PORT /dev/ttyS0
+
+ int ldisc = N_GSM0710;
+ struct gsm_config c;
+ struct termios configuration;
+ uint32_t first;
+
+ /* 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);
+ /* get first gsmtty device node */
+ ioctl(fd, GSMIOC_GETFIRST, &first);
+ printf("first muxed line: /dev/gsmtty%i\n", first);
+
+ /* and wait for ever to keep the line discipline enabled */
+ daemon(0,0);
+ pause();
+
+1.5 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
+
+1.6 first close all virtual ports before closing the physical port.
+
+ Note that after closing the physical port the modem is still in multiplexing
+ mode. This may prevent a successful re-opening of the port later. To avoid
+ this situation either reset the modem if your hardware allows that or send
+ a disconnect command frame manually before initializing the multiplexing mode
+ for the second time. The byte sequence for the disconnect command frame is::
+
+ 0xf9, 0x03, 0xef, 0x03, 0xc3, 0x16, 0xf9.
+
+2. config requester
+^^^^^^^^^^^^^^^^^^^^^
+
+2.1 receive string "AT+CMUX= command" through its serial port,initialize
+ mux mode config
+
+2.2 switch the serial line to using the n_gsm line discipline by using
+ TIOCSETD ioctl.
+
+2.3 configure the mux using GSMIOC_GETCONF / GSMIOC_SETCONF ioctl.
+
+2.4 obtain base gsmtty number for the used serial port::
+
+ #include <stdio.h>
+ #include <stdint.h>
+ #include <linux/gsmmux.h>
+ #include <linux/tty.h>
+ #define DEFAULT_SPEED B115200
+ #define SERIAL_PORT /dev/ttyS0
+
+ int ldisc = N_GSM0710;
+ struct gsm_config c;
+ struct termios configuration;
+ uint32_t first;
+
+ /* open the serial port */
+ fd = open(SERIAL_PORT, O_RDWR | O_NOCTTY | O_NDELAY);
+
+ /* configure the serial port : speed, flow control ... */
+
+ /* get serial data and check "AT+CMUX=command" parameter ... */
+
+ /* use n_gsm line discipline */
+ ioctl(fd, TIOCSETD, &ldisc);
+
+ /* get n_gsm configuration */
+ ioctl(fd, GSMIOC_GETCONF, &c);
+ /* we are requester and need encoding 0 (basic) */
+ c.initiator = 0;
+ 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);
+ /* get first gsmtty device node */
+ ioctl(fd, GSMIOC_GETFIRST, &first);
+ printf("first muxed line: /dev/gsmtty%i\n", first);
+
+ /* and wait for ever to keep the line discipline enabled */
+ daemon(0,0);
+ pause();
+
+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 Bénard - <eric@eukrea.com>
projects / linux.git / commitdiff