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GPRS communication

Posted on 2003-02-24
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hi everyone,
I am developing a GPRS application on ppc2002.i havent worked on GPRS before sending at commands at the hyperterminal is not working please help e throught this.

waiting in anticipication
regards
mahesh
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Question by:techmamith
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13 Comments
 
LVL 27

Expert Comment

by:BigRat
ID: 8008614
I don't understand what ppc2002 is?

In any event are you sure that your phone is GSM AT compatible?
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Author Comment

by:techmamith
ID: 8013886
sorry for being not so clear,
I have to develop an application on a pocekt pc which has pocket pc 2002 OS. now my problem is that I have to develop an application for GPRS communication on the pocket pc.I have a GSM,GPRS compatible modem by maestro.
I am developing the application using evc++3.0 and pocket pc 2002.how do i start sending the data using the GPRS communications

help me out with this
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LVL 27

Expert Comment

by:BigRat
ID: 8016337
OK. First I don't understand why a GSM compatible modem is not responding to AT commands. At least it should respond to just "AT" by returning "OK".

The next question is, what sort of application is it? SMS or TCP/IP based?
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Author Comment

by:techmamith
ID: 8022643
The GSM modem does responds to the AT commands,I am able to send and receive SMS,voice calls on it, that is not a problem.

My problem is I have to develop a GPRS application on it.There are AT commands for the GPRS communication but my GSM/GPRS modem is not responding to the AT commands sent through the hyperterminal.

so please guide me how do i go about
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LVL 27

Expert Comment

by:BigRat
ID: 8025175
"The GSM modem does responds to the AT commands,I am able to send and receive SMS,voice calls on it, that is not a problem."

A GSM modem does respond to AT commands if it can send SMS messages. I suspect that your modem is NOT AT compatible. What is the make and model number?
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Author Comment

by:techmamith
ID: 8031180
Big Rat, I think there is a slight misunderstading here.
My modem is GSM/GPRS compatible.I can send AT commands and recieve the responses from the modem.

My problem is not related to GSM or SMS.I have to send Data in my application using GPRS

I have already worked with GSM AT commands,but for the GPRS communications something extra has to be done other than just sending AT commands.

please guide me in that direction
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LVL 27

Accepted Solution

by:
BigRat earned 400 total points
ID: 8033526
"I have already worked with GSM AT commands,but for the GPRS communications something extra has to be done other than just sending AT commands."

Correct. The action is to establish a PPP link between your computer and the network using, amongst other things, the AT+CGDCONT command.

I'm no Pocket PC expert but I thought that Sockets were available as an interface, in which case installing the phone as a modem (with the required driver) would give you a TCP/IP connection to the net and thereby unlimited access to all sorts of services.

Have you tried sites like http://www.pocketpcthoughts.com/forums ?

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Author Comment

by:techmamith
ID: 8040274
Thanx big rat this is what i was looking for, can u please give me more information on this

regards
mahesh
0
 

Expert Comment

by:ellangle
ID: 8904315
hi
i think you can do nothing about GPRS connection via hyperterminal, but you can establish GPRS connection by typing ATd*99***1#. then get some strange response packets. that means you are in GPRS network mode. after 3 seconds the connection will be dead again. that is all you can do through hyperterminal.

regards,

ellangle
0
 

Expert Comment

by:Somasundaram
ID: 8985758

Hi all,
            For an project we are using Siemens TC35 Module which is integrated with an device(built specifically for our project by our clients). The TC35 Module is connected with the device through the serial port.
            Now when i load the SIM Tray with the SIM card & switch on the device(integrated & interfaced internally with TC35), & send an command "AT", It gives the response "OK", But now I make an call to an the SIM card number from my personal mobile. My Mobile says that the "Number you are Trying is Switched OFF". Iam very much Confused wether the device is witched on or off. Can you help me what I have to do. Also when I tried with "COPN", "CGMR",  "CREG", "COPS"commands, I get the "ERROR" messages. So Kindly help me.
 
            Also if any one can send me an sample source code to GSM communication for Dialing up an ISP connection & connecting to an Server, It would be greatly helpful to me.

         Iam in very urgent position.
 
Waiting for your reply.
 
Regards,
Somasundaram.J
somu@softcrylic.com
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