AT commands for GPRS User Guide
Contents
1. a des tiers sans son autorisation pr alable wavecom AT commands for GPRS User Guide WM_SW_OAT_UGD_003 Rev 004 July 2002 f proceed to the next screen g leave the area code field blank do not alter the country code field and type in in the telephone number field 99 1 star 99 star star star 1 hash The 1 tells the MS to activate PDP context number 1 If you defined a context as number 2 then replace 1 with 2 Note enter O in the area code if Windows complains that it is empty h Hit Next and Finish i On the window displaying dialup connection icons rigth click on your brand new connection icon and select properties h On the General tab be sure to uncheck the Use country and area code item g On the Server types tab uncheck everything except the last TCP IP item i Hit TCP IP settings button Activate Click on Server assigned IP address Activate Specify name server addresses and then enter the DNS IP addresses supplied by the GPRS operator if no DNS IP addresses are supplied by the operator then leave these fields blank They will be automatically assigned when activating a session Uncheck IP header compression Be sure Use default gateway is checked j Press OK and OK from the main menu k You re done with your PPP connection 6b Activating your dialup connection Before activating your connection check that the MS is registered into the network For2. Create a new file called option gprs in etc ppp from this excerpt Then add the following line in etc pap secrets my username my password my_username and my_password should be supplied by the GPRS operator If not enter any dummy name and password Finally invoke pppd as pppd ttySO 115200 file etc ppp options gprs wavecomCMcontidential Page 10 13 This document is the sole and exclusive property of WAVECOM Not to be distributed or divulged without prior written agreement Ce document est la propri t exclusive de WAVECOM Il ne peut tre communiqu ou divulgu a des tiers sans son autorisation pr alable amp WOVO eCOANA AT commands for GPRS User Guide WM_SW_OAT_UGD_003 Rev 004 July 2002 Be sure the context 1 is defined serial baud rate is set to 115200 baud and modem is connected to COM 1 aka ttySO Also be sure that option gprs is readable by the user who has invoked pppd In order to update the DNS server address of your linux workstation you will have to create a template file in directory etc ppp called for instance resolv gprs resolv file template for GPRS provider myisp com domain myisp com search myisp com where myisp com is the domain of the GPRS provider and then add the following lines in etc pppp ip up or etc ppp ip up local if it exists etc ppp ip up if f etc resolv conf J then cp p etc resolv conf etc ppp resolv conf bak cp etc ppp resolv
3. context 5 4 Defining a Quality of Service QOS profile 01 00cceseeeeneeeneeeeeeeenes 5 5 Activating a session w o transferring data 222222222222222 6 6 Activating a session and transferring data 000cceeeeeseeeeneeeeeeee eens 6 6a Defining a remote dial up connection ON PC issus 7 6b Activating your dialup CONNECTION cece cece cece eee eee eee ee sense enee tees eneeeneeeaes 8 6c PINGING a remote server cece eee eee eee eee eden enn tenet nese tne ene eeaee eas 9 6d Browsing the Web iciiccicisscceieceecdiecesevetesenasdieseesevetecteendiecesevsiesde engi esvaeeiegeie 9 Ge Using FUP cerides Malate en aad ae ae Ne anne area ee ea 10 6f Monitoring transfert progress sise 10 69 Using LiInUxX 38h88imihansseesinsaiten ententes imenenminen tes dinine mes tenitenterinenss 10 7 Troubleshooting 2 50 00 0uuun00 aa aa ones tee deee nes 11 7a Failure to log onto the GPRS network sisi 12 6b Failure to activate a SESSION di eee e eee eeeennaeeeeeeeengaeeeeeeneeggaunnens 12 6c Failure to send data after entering an URL 12 waveconCMcontidential Page 3 13 This document is the sole and exclusive property of WAVECOM Not to be distributed or divulged without prior written agreement Ce document est la propri t exclusive de WAVECOM Il ne peut tre communiqu ou divulgu a des tiers sans son autorisation pr alable amp WOVO eCOANA AT commands f
4. go better check dialup connection parameters especially DNS and the context s APN Or try another nameserver Some GPRS networks have been reported to bar PING packets If loss percentage is say less than 10 try longer PINGs with ping www wavecom com w 15000 I 1000 It will send PINGs of 1000 bytes in length The max length is 1460 If loss percentage is in between it means the dialup connection is likely to be properly configured Try another nameserver or try during off peak hours networks may allocate a very limited bandwidth for GPRS service in case of high voice traffic load Should you want to test the loss rate over extended period of time enter ping www wavecom com w 15000 n 100 Il will send 100 PINGs of 32 bytes Of course you can specify the length with I As a rule of thumb if the loss rate is less than 5 with 100 PINGs then the link is running well You may proceed to next stage There s no need for rebooting the module 6d Browsing the Web At this stage you can fire your preferred web browser Just be sure to configure it to use a direct connection ie no proxy With Netscape it s done through the menu Edition gt Preferences gt advanced gt proxy With IE get around by yourself waveconCMcontidential Page 9 13 This document is the sole and exclusive property of WAVECOM Not to be distributed or divulged without prior written agreement Ce document est la propri t exc
5. gprs etc resolv conf echo nameserver SDNS1 gt gt etc resolv conf echo nameserver SDNS2 gt gt etc resolv conf chmod 644 etc resolv conf fi Finally you will have to update the etc ppp ip down or etc ppp ip down local file to put the old dns servers back etc ppp ip down if f etc ppp resolv conf bak J then rm f etc resolv conf cp p etc ppp resolv gpr bak etc resolv conf fi In case of negociation failure it s may be worth to have a look at the trace log var log messages 7 Troubleshooting As already mentionned GPRS is a rather new technology and as a consequence networks and mobiles haven t reached yet the stability level they ve been enjoying in GSM So expect some failures every so often or total failure on some networks And bear with us wavecomnCMcontidential Page 11 13 This document is the sole and exclusive property of WAVECOM Not to be distributed or divulged without prior written agreement Ce document est la propri t exclusive de WAVECOM Il ne peut tre communiqu ou divulgu a des tiers sans son autorisation pr alable amp WOVO eCOANA AT commands for GPRS User Guide WM_SW_OAT_UGD 003 Rev 004 July 2002 Unfortunalety if you experience a failure to attach to activate a session etc there aren t many workarounds you can try 7a Failure to log onto the GPRS network In such a case try logging onto the GSM network by issueing AT CGCLA
6. that purpose launch HyperTerminal and proceed as described in step 1 Also be sure the serial rate of MS is set to 115200 baud If not issue AT IPR 115200 amp W Then close HyperTerminal Double click on your dialup connection icon Leave the user and password field empty unless the GPRS operator supplies them Hit Connect Normally if everything s going smoothly the dialup window should go down to the tray bar within 2 or 3 seconds of launching wavecomnMcontidential Page 8 13 This document is the sole and exclusive property of WAVECOM Not to be distributed or divulged without prior written agreement Ce document est la propri t exclusive de WAVECOM Il ne peut tre communiqu ou divulgu a des tiers sans son autorisation pr alable amp WOVO eCOANA AT commands for GPRS User Guide WM_SW_OAT_UGD_003 Rev 004 July 2002 6c Pinging a remote server Pinging is the simplest way to check whether the dialup connection is up Pinging consists of sending so called a PING request using the ICMP protocol and waiting for a PING response To ping open a DOS window and run ping as follows ping www wavecom com w 10000 Four PING requests for 32 bytes in length with a 10 sec timeout will be sent You can replace www wavecom com with whatever nameserver you want If the loss percentage is 100 then there s very likely something wrong Try increasing the timeout duration set it to 20000 If it does not
7. PRS network and the internet realm If no APN is provided simply type in AT CGDCONT 1 IP IP means that all data exchanged between the MS and the network are IP packets This is the only type supported rigth now Other optional parameters are not relevant for the time being In this step no error should occur 4 Defining a Quality of Service QoS profile The QoS consists of a set of 5 parameters precedence delay reliability peak throughput mean throughput which allow the user to reach a trade off between contradictory features For instance depending on the application the user can favor a better reliability at the expense of the throughput For the moment the QoS is usually ignored by the network which provides a best effort service However one parameter matters more than the others the reliability parameter which determines whether the LLC and RLC layers offer acknowledged or un acked service For the time being this firmware only supports LLC unacked mode and RLC acked mode So the QoS shall be defined as follows AT CGOREQ 1 0 0 3 0 0 wavecomnCMcontidential Page 5 13 This document is the sole and exclusive property of WAVECOM Not to be distributed or divulged without prior written agreement Ce document est la propri t exclusive de WAVECOM Il ne peut tre communiqu ou divulgu a des tiers sans son autorisation pr alable wavecom AT commands for GPRS User Guide WM_SW_OAT_UGD_003 Re
8. SS CC if MS was in class CG Registration progress can be checked with AT CREG See the ATcommand guide for more information about this command Basically if after a short while it responds CREG 0 1 then the MS has successfully completed GSM attachment As consequence failure to GPRS attachment is likely due to either MS firmware fault see section Making logs the cell the MS is camped on does not support GPRS So far there isn t any means to check whether a cell has support for GPRS In case GSM registration fails as well faulty hardware or bad antenna power connection may be suspected Check also the SIM card and be sure to enter PIN code if any It s also worth checking the MS s IMEI 6b Failure to activate a session If you had entered AT CGOREO 1 0 0 3 0 0 then try with AT CGOREQ 1 0 0 0 0 0 and vice versa Also be sure to properly enter the APN which is case sensitive See section Making traces 6c Failure to send data after entering an URL The MS is GPRS attached the session is successfully open the remote dialup connection is running fine on PC but when enter an URL in the web browser nothing seems to happen So first of all double click on dialup connection icon from the tray ar and check whether the number of sent bytes increases whenever you enter an URL and press ENTER If that number does not increase there is much likely a routing problem coming from the PC In that case ru
9. be easier to investigate in step 5 than in step 6 Since the MS has no embedded applications the wavecomnCMcontidential Page 6 13 This document is the sole and exclusive property of WAVECOM Not to be distributed or divulged without prior written agreement Ce document est la propri t exclusive de WAVECOM Il ne peut tre communiqu ou divulgu a des tiers sans son autorisation pr alable amp WOVE CONMA AT commands for GPRS User Guide WM_SW_OAT_UGD 003 Rev 004 July 2002 transfert of data must be carried out using a PC hooked onto the MS via a serial cable A bit of theory before getting into details It s worth pointing out that GPRS is IP centric It means that it does not provide a transparent link between the MS and the network This clearly contrasts with CSD Circuit Swiched Data or data calls in GSM mode which provides a transparent link in which data can be of whatever protocol format structure etc the user wants So in a nutshell using GPRS implies that IP packets be exchanged between MS the and the network In the case a PC is hooked to the MS it also implies that IP packets be exchanged between the PC and the MS That s why the GPRS link is not considered as a transparent link since the MS only expects IP packets from the PC and no longer unstructured plain data Going on further it s not possible to carry plain IP packets over a serial link due to loss of packet boundaries since serial links a
10. lusive de WAVECOM Il ne peut tre communiqu ou divulgu a des tiers sans son autorisation pr alable amp WOVO eCOANA AT commands for GPRS User Guide WM_SW_OAT_UGD_003 Rev 004 July 2002 6e Using FTP The vanilla FTP client from Window could be used to download files Just run it ftp exe and enter open nameserver and then type in cd dir and get to navigate through the site and download files Also Web browsers can be used 6f Monitoring transfert progress Windows provides a system tool to monitor the instant throughput in fact averaged over a few seconds To run it Start gt Programs gt Accessories gt System tools gt system monitor If it does not appear then it is not installed Install it now In system monitor grab the Edit menu then choose Add item and add the remote adapter item and select incoming outgoing options 6g Using Linux Using Linux and the pppd deamon on the client PC works fine You can even get the DNS from the GPRS operator provided you use at least pppd release 2 3 7 Take care to disable any compression parameter Do man pppd for configuration Don t forget to enter the DNS parameters in etc resolv conf Here below is a sample of the pppd configuration file nodetach debug kdebug 7 CECSCES name my usersame connect chat vs ECHO OFF AT r OK ATEOVI r OK ATDT 99 1 CONNECT nov nomagicnumber asyncmap 0 defaultroute usepeerdns
11. n the winipcfg tool and check for entries different from PPP adapter from the combo list waveconCMcontidential Page 12 13 This document is the sole and exclusive property of WAVECOM Not to be distributed or divulged without prior written agreement Ce document est la propri t exclusive de WAVECOM Il ne peut tre communiqu ou divulgu a des tiers sans son autorisation pr alable amp WOVO eCOANA AT commands for GPRS User Guide WM_SW_OAT_UGD 003 Rev 004 July 2002 If they are so select them one by one and for each one hit free to tell Windows this inferface is now down and must done ignored when routing In some cases this may not be enough for Window to route packets to the default PPP interface so on a laptop try deactivating the ethernet PCMCIA card through the PCMCIA deamon in the tray bar If none of these advices fixes the problem try tweaking the network parameters in the config panel In case it still persists dump Windows and use Linux waveconCMcontidential Page 13 13 This document is the sole and exclusive property of WAVECOM Not to be distributed or divulged without prior written agreement Ce document est la propri t exclusive de WAVECOM Il ne peut tre communiqu ou divulgu a des tiers sans son autorisation pr alable
12. or GPRS User Guide WM_SW_OAT_UGD_003 Rev 004 July 2002 1 Introduction This brief guide aims at explaining the basic steps for getting started with GPRS It supposes you are a bit familiar with GPRS concepts like network attachment session or PDP context This guide is not intended to give full details about how GPRS works all GPRS specific AT commands check out the GPRS AT command manual 2 Getting attached By default depending on the firmware version the MS starts up either in class CG i e in GPRS mode and not in GSM mode or in class B With firmwares 520 and 521 which are only class C capable the default mode is CG mode With firmware 526 and above the default mode is class B You can retrieve the firmware version with AT CGMR When powering up in mode CGthe MS is automatically attempting to get GPRS attached CC or B the MS is automatically attempting to get IMSI attached Therefore it s worth noting that in class B no automatic GPRS attach is done at startup This is a request from many network operators which do not want to have all their ressources used up by mobiles not using the GPRS service In that case a GPRS attach is manually forced by AT CGATT 1 Note that manually forcing GPRS attachment is usually not necessary since the MS automatically attempts to attach prior to opening a session The user can check whether the MS is GPRS attached by entering AT CGREG which is the counter pa
13. re not packet oriented So to overcome this and to manage the IP configuration a low level protocol named PPP is used This protocol embeds IP packets into PPP frames which then are sent over the serial link On M Windows PPP is basically refered to as a dial up connection which is configured as follows 6a Defining a remote dial up connection on PC On the PC side a dial up connection has first to be defined Following instructions are only applicable with W95 W98 a Click on the MyComputer icon on the desktop b Select dial up networking c Select Make New connection d Enter the name of the connection e Select a standard 19200 and configure the max speed to 115200 after clicking the configure button and the COM according to your needs Should the standard 19200 modem not installed you have to install it prior moving on select the modems icon from the configuration panel select Add and check the Do not detect my modem item Select a Standard modem types from the manufacturer list and then select a standard modem 19200 or higher When you re done with the installation click the Properties button from the modem panel and set the speed to 115200 wavecomnCMcontidential Page 7 13 This document is the sole and exclusive property of WAVECOM Not to be distributed or divulged without prior written agreement Ce document est la propri t exclusive de WAVECOM Il ne peut tre communiqu ou divulgu
14. rt command of AT CREG GSM attachment status The response CGREG 0 1 means the MS is successfully attached The response CGREG 0 0 means the MS is trying to attach The response CGREG 0 2 has failed to attach and stopped trying to attach This occurs approx within 1 3 min of powering up Alternatively the registration status can be retrieved using AT CGATT The response CGATT 1 means the MS is successfully attached wavecomnMcontidential Page 4 13 This document is the sole and exclusive property of WAVECOM Not to be distributed or divulged without prior written agreement Ce document est la propri t exclusive de WAVECOM Il ne peut tre communiqu ou divulgu a des tiers sans son autorisation pr alable amp WOVO eCOANA AT commands for GPRS User Guide WM_SW_OAT_UGD 003 Rev 004 July 2002 Whereas response CGATT 0 means the MS is not attached or has failed to attach This command is somewhat less accurate than AT CGREG 3 Defining a PDP Packet Data Protocol context Before setting up a session a PDP context has to be defined This procedure has to be done only once or after all objects in flash have been erased Therefore even though a new firmware and w e2p file are downloaded the PDP contexts still remain The following command is used for that purpose AT CGDCONT 1 IP apn whereby apn is a string parameter supplied by the GPRS operator and specifies the gateway to be used between the G
15. v 004 July 2002 The first 1 is the number of the PDP for which the QoS is to be defined O means the corresponding parameter will be set by the network upon session activation 3 sets the reliability to LLC unacked and RLC acked Like AT CGDCONT this command has to be entered only once just after defining a context In this step no error should occur 5 Activating a session w o transferring data For the first experiment it could be useful to activate a session without entering the online mode It is done with AT CGACT 1 1 Which activates the context 1 If OK is returned then everything is fine if ERROR is returned see Troubleshooting section For the sake of learning now enter AT CGACT to get activation status of all defined contexts It should come back with CGACT 0 0 CGACT 1 1 which means the context 0 default context which may be used when no parameter like APN needs to be supplied when defining the context is not activated whereas our context 1 is activated At this stage it s not possible to transfer data because the MS is still offline Try deactivating the session with AT CGACT 0 1 Now AT CGACT should answer back CGACT 0 0 CGACT 1 0 meaning all contexts are deactivated 6 Activating a session and transferring data At this point things get a little bit more complicated But please before going on further be sure that step 5 is successful If not successful it will
16. wovecom AT commands for GPRS User Guide Revision 004 Date July 2002 Reference WM_SW_OAT_UGD_003 Waveconm confidential Page 1 13 This document is the sole and exclusive property of WAVECOM Not to be distributed or divulged without prior written agreement Ce document est la propri t exclusive de WAVECOM Il ne peut tre communiqu ou divulgu des tiers sans son autorisation pr alable amp WOVO eCOANA AT commands for GPRS User Guide WM_SW_OAT_UGD_003 Rev 004 July 2002 Document Information Revision Date History of the evolution 001 1 1 27 11 01 Added PPP config files for Linux 002 1 2 06 12 01 Added information about 526 003 1 3 05 04 02 Added information about 532 004 1 4 10 Jul 2002 Added information about PPP DNS management on linux waveconCMcontidential Page 2 13 This document is the sole and exclusive property of WAVECOM Not to be distributed or divulged without prior written agreement Ce document est la propri t exclusive de WAVECOM Il ne peut tre communiqu ou divulgu a des tiers sans son autorisation pr alable amp WOVO eCOANA AT commands for GPRS User Guide WM_SW_OAT_UGD_003 Rev 004 July 2002 Contents 1 Introduction 5 5 2 100 5 u uasentueuenasmtodes entateiquszenasteshussecstesduus 4 2 Getting attach d 1 022100 itunes insu ieee eee aE 4 3 Defining a PDP Packet Data Protocol
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