Question

SMS over GPRS

Asked by: manupeco

I'm trying to send sms over gprs with a modem connected to pc through a serial cable. The AT command that I use are the follow:

AT+CGSMS = 0;
AT+CMGF = 1;
AT+CMGS = "PhoneNumber"
> Testo del messaggio ^Z(CTRL+Z)

I have tried to send command with hyperterminal and the modem get to me error at AT+CMGS command.

Another error that i have is when i try to set a simple gprs connection. The command and response is below:

at+cgdcont?
+CGDCONT: 1,"IP","uni.tim.it","",0,0
OK
atd*99#
CONNECT
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}"}&} }*} } }'}"}(}"}%}&Ì,}8•}#}$À#»·~~ }#À!}!}#} }<}!}$}'Ð}"}&} }*} } }'}"}(}"}
%}&Ì,}8•}#}$À#»·~~ }#À!}!}#} }<}!}$}'Ð}"}&} }*} } }'}"}(}"}%}&Ì,}8•}#}$À#»·~~ }#
À!}!}#} }<}!}$}'Ð}"}&} }*} } }'}"}(}"}%}&Ì,}8•}#}$À#»·~~ }#À!}!}#} }<}!}$}'Ð}"}&
} }*} } }'}"}(}"}%}&Ì,}8•}#}$À#»·~~ }#À!}!}#} }<}!}$}'Ð}"}&} }*} } }'}"}(}"}%}&Ì
,}8•}#}$À#»·~~ }#À!}!}#} }<}!}$}'Ð}"}&} }*} } }'}"}(}"}%}&Ì,}8•}#}$À#»·~~ }#À!}!
}#} }<}!}$}'Ð}"}&} }*} } }'}"}(}"}%}&Ì,}8•}#}$À#»·~~ }#À!}!}#} }<}!}$}'Ð}"}&} }*
} } }'}"}(}"}%}&Ì,}8•}#}$À#»·~
NO CARRIER
at+cgatt=0
OK

Someone can help me?

Thanks

Emanuele

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Asked On: 2003-05-16 at 03:58:58ID20618436
Tags: sms
,; gprs
,; over
Topic: Wireless Application Protocol (WAP)
Participating Experts: 2
Points: 20
Comments: 11

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Answers

by: navenetworksPosted on 2003-05-27 at 21:01:59ID: 8595072

Hi sir,

If the AT+CMGS command don't work it is because the last command was not sucessfull.
AT+CMGF = 1 This put the mobile phone in text mode SMS, but this command don't work with all the mobile phones.

For example, Ericsson T39 only works in PDU mode AT+CMGF=0. Most Nokia mobile phone allow more modes to work in.

I am sure this url will help u to resolve your problem.

http://www.dreamfabric.com/sms/

I am sure this will help u to work.

The ATD command should be atd*99***1#
The think you get is correct, just it is difficult to understand using the hiperterminal tool :)

Raul Mate

by: manupecoPosted on 2003-05-29 at 00:33:50ID: 8604000

Thanks Raul,
but i have another question now. When I try to send sms with commands specified in the question, there must to be a GPRS connection already active or the phone provide after the AT command to establish a connection?

I have tried with ATD*99***1# but the result is the same. This because there must to be a PPP negotiation beetween client and server and i don't think that the simple AT commands are sufficient to establish the connection.

Thanks
Emanuele Pecorari

by: navenetworksPosted on 2003-05-29 at 03:56:38ID: 8604848

Hi,

The mobile phone cannot send SMS at same time that a GPRS connection is connected using the serial cable. It is curious that with the mobile phone (from the mobile phone) it works correctly because the mobile phone when you do a phone call or send a sms it interrupt the GPRS connection without disconnecting, stoping the packet transfer and then it works again. But this can only done by the mobile phone.

If you just want to send sms quickly use the protocol PDU it will work very good for u. If you want to send using the text mode, get the Nokia 6210 it is the more quick mobile phone to send SMS at 1 sec by sms rate :) You can do a simple application it just send this AT command and you will send very quick.

The only thing important if you do this is to interrumpt sending every 30 minutes, to delete received messages (some people answer) or the mobile will get ram off and it will not continue sending at 1 sec/sms rate. With Nokia communicator or other mobile phones is very SLOW, 5 sec /sms rate.

About " have tried with ATD*99***1# but the result is the same. This because there must to be a PPP negotiation beetween client and server and i don't think that the simple AT commands are sufficient to establish the connection." you are right, it is very difficult to do a PPP connection yourself, you need a PPP protocol API or just to connect with a simple windows :-)

You can try anyway to make some test, runing commands with ; at the end, so the command mode will continue working and maybe you get some way to send sms beeing connected but i think it will not work because the PPP could detect some errors and u get disconnected then.

If you need to send lot of sms by sec, tell me :) there are better solutions to send lot of SMS :)

Just tell me, i have lot of experience about this.

Raul Mate Galan

by: manupecoPosted on 2003-05-29 at 05:29:25ID: 8605290

I understand your precisations but I have a Sony Ericsson T300 and one of its options is the possibility of choose to send SMS through GSM or GPRS. So, in this case i think that the GPRS connection and the SMS sending must coexist.

Then I think that is possible to lead phone through serial cable to send SMS over GPRS at the same manner to send SMS over GPRS from phone directly.

Do you know what the phone does when send SMS over GPRS?

Thanks
Emanuele Pecorari

by: navenetworksPosted on 2003-05-29 at 09:28:12ID: 8607108

I have read the next doc:
http://216.239.51.100/search?q=cache:CWROKRE3QnIJ:www.nokiame.com/tech-GPRS-using.shtml+send+sms+using+GPRS&hl=es&ie=UTF-8

Using my Nokia GPRS mobile

Can I make normal speech calls during the GPRS data transfer, and how does it affect to the data transfer?
Yes, it is possible. The GPRS data transfer is suspended (i.e. data transfer is paused) while making or receiving the voice call. After the call it is possible to resume e.g. WAP browsing.

Can I divert calls when using GPRS?
Yes. With a GPRS connection open you may activate call diverts using the mobile menu. With dial-up the mobile menu is normally accessible. Activating and deactivating diverts is done the normal way from the user point of view. With WAP the browser must be closed to

change diverts or you need to activate diverts before you start using WAP browser.

Can I use the voice name dialer and commands?
Yes. You may use also the voice dialer and commands while the Always-on is enabled. However, during the data transfer, the voice dialing and commands function disabled. <---- SOME COMMANDS AT ARE DISABLED

Can I receive and send SMS when GPRS is on? <--- I AM LOOKING FOR MORE INFO ABOUT IT
Yes, normally.

Can I receive an SMS while using WAP over GPRS?
When an SMS is received it is not displayed while the browser is open. Only an indication tone is played (this depends on the profile settings) and after closing the browser the received SMS is displayed.

Can I send an SMS while using WAP over GPRS?
No. It is not possible to send an SMS without closing the WAP browser first. After sending the SMS you can start WAP browsing again from your homepage.

Operations and some features are network dependent. Please check the availability of WAP services with your network operator and/or WAP service provider.

I will try to find more info to help you.

Read this article, maybe it can help u too:
http://www.optimay.com/en/product/fs.html

Look for AT COMMANDS FOR GPRS, maybe there is a way to do it, if i find something i will post it there friend.

If you can help me i will appreciate a lot.

I am looking for some way to send GET and POST commands to a WAP GATEWAY, do u know something about it?

I need to communicate me to a wap gateway to ask the gateway for a page. It seems the communication is using UDP packets so we cannot test with TELNET port 9201 the protocol :)

I need more info about it.

Raul

by: navenetworksPosted on 2003-05-29 at 10:13:02ID: 8607462

http://www.ericsson.com/mobilityworld/developerszonedown/downloads/docs/more_phones/T39_dg.pdf
You can get the same for your model.

But I got info about sending SMS using GPRS,

The related command to perform it is AT+CGSMS? to see the status or AT+CGSMS=2 to setup send SMS using GRPS.

There is a command it will interrupt GRPS connection to be able to send the SMS and then when the command SMS is sucefull you will be able to restore the GPRS connection in the same point.

AT+CGATT= 0 Detach GPRS service,

AT+CGATT=1 Attach GPRS service

Maybe this tool can help u to do it, if you resolve it please send me a piece of info about :) maybe in the futur i could need it too.

See this homepage: http://www.ericsson.com/mobilityworld/sub/open/docs-all.html

http://www.ericsson.com/mobilityworld/sub/open/devices/more_phones/docs/t300_doc Special doc for your mobile.

Raul

by: navenetworksPosted on 2003-05-29 at 14:29:41ID: 8609265

have u tried AT*99#;

and then the other command?

Raul

by: manupecoPosted on 2003-05-30 at 01:38:01ID: 8612285

Now i'm able to connect with GPRS with command AT*99***1# through pppd call on Linux calling from a Java application.

But my problem is now that I must to send AT commands for send SMS through GPRS to modem but this is busy for GPRS connection launched from the same java application that after must send these AT commands.

The soultion should be to do the call AT*99***1# from the same java application but I'm not able to lead only PPP negotiation from application.

In fact, when I launch ppd call, it's able to do the whole process for connection i.e. at commands for calling and ppp negotiation. I want to isolate the ppp negotiation part to call it when I have launched ATDT from java application and I have received connect response form server that indicates that the communication can start

Someone have idea about it?

Raul, do you want to send GET and POST to Wap Gateway form an application? in what language?

Best Regards
Emanuele

by: navenetworksPosted on 2003-05-30 at 12:41:50ID: 8616840

I need it to be done in several languages: It could be in PHP, Visual Basic or Delphi.
If you can help me I will appreciate really.

I have a question, why u need to send sms connected to GPRS?

Raul

by: manupecoPosted on 2003-05-31 at 01:17:01ID: 8619340

I need to send SMS through GPRS because it's faster than on GSM.

by: touchringPosted on 2003-06-23 at 05:19:08ID: 8780936

I find this post very interesting, and did some research in this area using my wavecom gprs module. I can't figure out why we must connect ppp when we can connect to the GPRS network, as in AT+CGACT=1. So i tried the steps mentioned above, and also with reference to Wavecom's started guide.

At first, i got some unknown error with AT+CMGS --> CME 500 Error and CMS 514, which is unidentified destination number - not a logical response to me - and so I decide to update the firmware to the latest, thinking it might be version problem. Also, the wavecom guide says AT+CGSMS=0 doesn't work for that current version - the guide was created in 2002, now is mid-2003.

After upgrading, i got the CMS 47 error instead.

The CMS 47 error is defined as "Resources unavailable, unspecified - This cause is used to report a resource unavailable event only when no other cause applies."

Ok, i think i managed to get it to the point whereby the modem tries to send SMS over GPRS, but the carrier doesn't support SMS over GPRS.

Alas, i can't test any more, because - i found out all the carriers in my country do not support SMS over GPRS!!!

Can someone try out the same steps, but in a network with SMS over GPRS support, and share your findings with everyone?

Note: i used AT+CMGF=1, but wavecom can support text other than PDU.

Rgds,
Joshua

Email: joshua@visualgsm.com
http://www.visualtron.com

20120131-EE-VQP-002

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SMS over GPRS

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sms

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Wireless Application Protocol (WAP)

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