1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
==============================
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>
|
