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gsmd is the GSM daemon running in background of an Openmoko phone, managing the traditional 'phone' parts (voice/sms/gprs communication links) of the phone.
Further technical details and API documentation in progress, is available here.
On the phone
gsmd is usually started as a background daemon when booting by the /etc/init.d/gsmd script, in this case gsmd outputs debug messages to the file "/tmp/gsm.log" (stdout and stderr is redirected there).
For debugging purposes gsmd can be run in foreground mode, options can be queried like:
> gsmd --help gsmd - (C) 2006 by Harald Welte <email@example.com> This program is FREE SOFTWARE under the terms of GNU GPL Usage: -v --version Display program version -d --daemon Deamonize -h --help Display this help message -p dev --device dev Specify serial device to be used -s spd --speed spd Specify speed in bps (9600,38400,115200,...) -F --hwflow Hardware Flow Control (RTS/CTS) -L --leak-report Leak Report of talloc memory allocator -l file --logfile file Specify a logfile to log to
If your GSM modem is attached to ttySAC0 (like in the Neo1973), invoke it as e.g.:
> gsmd -p /dev/ttySAC0 -s 115200 -F
(baud rate seems to be autodetected by the modem)
From host PC
With recent uboot (svn > r2885), the gsm modem can be powered on and connected to uboot's serial console from uboot itself. Thus allowing the host PC to interact directly with the modem. Some notes about getting gsmd running in this manner is here.
libgsmd is a library with C language API for application programs. Programs using this library can use the phone, e.g. make phone calls, receive incoming calls, register to the network, etc.
libgsmd-tool is a small demo application that can be used to demonstrate the usage of the libgsmd API.
libgsmd-tool has multiple modes.
Usage of shell mode
Shell mode provides a simple text-based command interface for making voice calls.
The shell mode can be started using
libgsmd-tool -m shell
It can be used like in the following example:
> src/util/libgsmd-tool -m shell libgsm-tool - (C) 2006 by Harald Welte This program is Free Software and has ABSOLUTELY NO WARRANTY ? A Answer incoming call D Dial outgoing number H Hangup call O Antenna Power On o Antenna Power Off gos Get Antenna Status V Vibrator Enable (CVIB=1) v Vibrator Disable (CVIB=0) M Modem Power On m Modem Power Off r Register to network R Register to given operator (R=number) U Unregister from netowrk P Print current operator N Print current operator in numeric L List available operators Q Read signal quality nr Query network registration S Sleep (S[=second], default 5) T Send DTMF Tone n Print subscriber numbers pd PB Delete (pb=index) pr PB Read (pr=index) prr PB Read Range (prr=index1,index2) pf PB Find (pf=indtext) pw PB Write (pw=index,number,text) ps PB Support pm PB Memory pp PB Set Memory (pp=storage) sd SMS Delete (sd=index,delflg) sl SMS List (sl=stat) sr SMS Read (sr=index) ss SMS Send (ss=ask_ds,number,text|["text"]) sw SMS Write (sw=stat,number,text) sm SMS Storage stats sM SMS Set preferred storage (sM=mem1,mem2,mem3) sc SMS Show Service Centre sC SMS Set Service Centre (sC=number) gvm Get Voicemail number svm Set Voicemail number(svm=number) im Get imsi mf Get manufacturer ml Get model rv Get revision sn Get serial number cs Get Call status gp Get PIN status cbc Get Battery status Rh Release all held calls (+CHLD=0) UDUB User Determined User Busy (+CHLD=0) Ra Release all active calls (+CHLD=1) Rx Release specific active call x (Rx=x)(+CHLD=1x) Ha Hold all active calls and accept held or waiting call (+CHLD=2) Hx Hold all active calls except call x (Hx=x)(+CHLD=2x) MP Add a held call to the conversation (+CHLD=3) CFD Disable call forwarding (CFD=reason) CFE Enable call forwarding (CFE=reason) CFQ Query the status of call forwarding (CFQ=reason) CFR Register call forwarding (CFR=reason,number) CFe Erase a record of call forwarding (CFe=reason) q Quit O # EVENT: PIN request (type=1) Please enter PIN: 6582 r # EVENT: Netreg searching for network EVENT: Netreg registered (home network) D03024033902 # Dial 03024033902 EVENT: Call Progress: UNKNOWN EVENT: Call Progress: PROCEED EVENT: Call Progress: SYNC EVENT: Call Progress: ALERT H # Hangup EVENT: Call Progress: DISCONNECT EVENT: Call Progress: RELEASE EVENT: Incoming call type=2! EVENT: Incoming call clip=`"03024033902"' EVENT: Incoming call type=2! A # Answer RSTR=`OK' H # Hangup RSTR=`OK'
Usage of atcmd mode
The atcmd mode is a passthrough-mode. Passthrough means that it accepts GSM 07.07 commands, passes them through the daemon to the phone, and returns you the response. this is very useful for debugging.
The atcmd mode can be started using
libgsmd-tool -m atcmd
Usage is like in the following example:
> src/util/libgsmd-tool -m atcmd libgsm-tool - (C) 2006 by Harald Welte This program is Free Software and has ABSOLUTELY NO WARRANTY AT+CPAS STR=`AT+CPAS' RSTR=`+CPAS: 0' AT+COPS=? STR=`AT+COPS=?' RSTR=`+COPS: (2,"E-Plus","E-Plus","26203"),(3,"o2 - de","o2 - de","26207"),(3,"Vodafone.de","Vodafone","26202"),(3,"T-Mobile D","TMO D","26201")'
Operator selection functions were implemented and merged into SVN head:
The new commands in libgsmd-util are as followings:
R - Register to given operator (R=number) P - Print current operator L - Detect available operators Q - Read signal quality
This is implemented by the functions with "_opers_" naming.
(please add items to this list if you're missing more features)
- Phone related functions
- Airplane mode / gsmd stop (this will be done outside gsmd, by using runlevels / upstart)
- Capability to set-up Emergency Calls, even if the device does not hold a SIM card
- obtain manufacturer/model/revision/IMEI
- Ability to notify user if the SIM card is locked (or even automagically unlock it?)
- SMS related features
- send SMS
- receive SMS
- obtain IMSI
- access to SIM-card stored SMS - No longer missing - see help
- SIM related functions
- read phonebook entry - No longer missing - see help
- write phonebook entry - No longer missing - see help
- GPRS related functions
- set up GPRS link, use it via separate DLC of TS07.10 multiplex
- gsmd internal infrastructure
- fine-grained event subscriptions (rather than wildcard-subscribe)
- possibility to specify log-level from command line
- logfile re-opening on SIGUSR1 or SIGHUP (logrotate)
- permission handling
- d-bus interface
gsmd needs to do apropriate state tracking of the underlying GSM hardware. For many of the state transition we only get events from the GSM Modem, but don't have apropriate query commands. Thus, assuming gsmd runs all the time, applications can come and go, but still have an idea about the current state of the modem, even if they missed the initial state transitions.
Also, gsmd state tracking allows us to allow for safer interoperability of multiple applications. If i.e. one applications has just started an outgoing call, gsmd can detect another application who intends to interfere with that and deny access
device power state
- modem completely off, not responding to AT commands
- modem responding to AT commands, but powered off (CFUN=0)
- modem responding to AT commands, in some power saving mode
- modem responding to AT commands, powered on, fully operational (CFUN=1)
Suspend power state
It must also configure the modem so that it can on appropriate events wake the system from sleep.
network registration state
- not registered to any network, not trying to register
- not registred to any network, searching/trying to register
- registered to home network (including cellID)
- registered to roaming network (including cellID)
ciphering indication state
- ciphering indications not supported by modem
- ciphering indications supported, but disabled in SIM
- ciphering indications supported, ciphering active
- ciphering indications supported, ciphering inactive
Sources of gsmd are kept in OpenMoko svn in src/target/gsm directory.