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== Network related functions ==
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== 網路相關的功能 ==
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Operator selection functions were implemented and merged into SVN head[http://lists.openmoko.org/pipermail/gsmd-devel/2007-September/000216.html]:
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控制員的選擇功能被合併到 SVN head[http://lists.openmoko.org/pipermail/gsmd-devel/2007-September/000216.html]：
  
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The new commands in libgsmd-util are as followings:
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libgsmd-util 指令列如下：
 
   R  -  Register to given operator (R=number)
 
   R  -  Register to given operator (R=number)
 
   P  -  Print current operator
 
   P  -  Print current operator
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   Q  -  Read signal quality
 
   Q  -  Read signal quality
  
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This is implemented by the functions with "_opers_" naming.
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它是由名為 "_opers_" 所執行。
 +
 
 
== Currently missing ==
 
== Currently missing ==
  

Revision as of 10:50, 19 May 2008

gsmd 是在Openmoko手機上執行的 GSM背景程式。它用來管理話機中傳統的'通話' 領域 (聲音/簡訊/gprs 通訊連結)。

你可以在這裡找到進行中的進階技術描述及API文件。


Contents

Usage

On the phone

當以/etc/init.d/gsmd script啟動時，gsmd 通常會以背景程式執行，在這個案例當中gsmd會輸出偵錯訊息到 "/tmp/gsm.log"檔案中 (stdout及stderr在這裡則被重新導引).

針對偵錯目地，gsmd可以在前景模式下執行，可以被使用的選項如下： 

> gsmd --help
gsmd - (C) 2006 by Harald Welte <laforge@gnumonks.org>
This program is FREE SOFTWARE under the terms of GNU GPL

Usage:
        -v      --version       顯示程式版本
        -d      --daemon        Deamonize
        -h      --help          顯示輔助訊息
        -p dev  --device dev    指定串列裝置為作用中裝置
        -s spd  --speed spd     指定bps速度 (9600,38400,115200,...)
        -F      --hwflow        硬體流量控制(RTS/CTS)
        -L      --leak-report   Leak Report of talloc memory allocator
        -l file --logfile file  Specify a logfile to log to

如果你的GSM 數據機連接到ttySAC0 (如 Neo1973)， 使用如下指令啟動它： 

> gsmd -p /dev/ttySAC0 -s 115200 -F

(baud rate可被modem自動偵測)

從host PC

使用最近的 uboot (svn > r2885)，gsm modem可以電源啟動，並且從uboot本身連接到uboot的串列控制埠。然後，允許host PC直接與數據機互動。關於host pc執行gsmd 的文章，你可以在這裡找到。

libgsmd

libgsmd 是C 語言API中的程式庫。這個程式庫的程式可以被用在手機上，如打電話、接收電話、註冊為網路一員...等。

libgsmd-tool

libgsmd-tool 是可以用來詮釋libgsmd API的小型展示應用程式。

Usage

libgsmd-tool 有多重模式。

Usage of shell mode

Shell 模式針對語音通話提供一個簡單的text-based 指令界面。

shell 模式可以利用下面的指令啟動 

libgsmd-tool -m shell

以下即為它的實做範例： 

> 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       Power On
        o       Power Off
        r       Register to network
        R       Register to given operator (R=number)
        U       Unregister from netowrk
        P       Print current operator
        L       Detect available operators
        Q       Read signal quality
        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)
        pRr     Retrieve Readrg Records
        pRf     Retrieve Find Records
        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)
        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'

atcmd 模式的用途mode

atcmd模式是passthrough-mode。Passthrough指的是它接收 GSM 07.07 指令，透過背景程式將它傳送到電話，並且傳回你的回應。這對於偵除錯誤來講，是很有用的一個方法。


atcmd模式可以由使用下列指令來啟用它 

libgsmd-tool -m atcmd

它的用途可以參考下面的範例： 

> 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")'

網路相關的功能

控制員的選擇功能被合併到 SVN head[1]：

libgsmd-util 指令列如下： 

 R  -  Register to given operator (R=number)
 P  -  Print current operator
 L  -  Detect available operators
 Q  -  Read signal quality

它是由名為 "_opers_" 所執行。

Currently missing

(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

Implementation Thoughts

Testing framework

Emulating/mocking the firmware, gsmd and libgsmd can be tested for functionality; on any machine. See Kero's page or go directly to the (lib)gsmd testing page.

State tracking

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

call state

  • idle
  • busy

Sources of gsmd are kept in OpenMoko svn in src/target/gsm directory.

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