Connect to GPRS using Wavecom modem, and the using of 'PPP commands'

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darkck05

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Topic # 6120 28-Dec-2005 21:10

Hi,

I understand that to connect to GPRS, I need to enter the following AT commands (I use a Wavecom Fastrack modem) into the Hyperterminal: AT +CGDCONT=1, "IP", "internet"; +GCDCONT=2, "IP","shwap" (shwap is the APN)

And after that: ATD*99***1# and then press Enter to start connecting.

The results was lines of "garbage" characters which doesn't make any sense. Also, I read the many threads in other forums and it seems that I need to use PPP commands in order to send data.

After connecting to GPRS, I would connect to WAP gateway, and then connect to the MMSC to send an MMS message file. So what is up with this "PPP commands" and when should I use it to send my MMS file over?

freitasm

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Reply # 25415 28-Dec-2005 22:51

Welcome to Geekzone... I think things are mixed up.

PPP (Point-to-point protocol) is not used to send MMS or SMS at all. It's a protocol to connect two points in an IP network. Check Cisco and Wikipedia.

Also, your +CGDCONT string seems to have one too many.

By using an APN named "internet" it seems you are accessing a APN that connects to the Internet, not to a MMSC or service providers.

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darkck05

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Wannabe Geek

Reply # 25471 29-Dec-2005 17:06

Hi thanks for the reply.

To be honest, I read through about Point to Point Protocol in Wikipedia, but at that time I didn't really understood what was said. Sorry for the trouble, I'm a newbie on topics like GPRS, MMS and PPP.

Yes, I find it puzzling too. The AT command --> AT +CGDCONT=1, "IP", "internet"; +GCDCONT=2, "IP","abc.com" doesn't seem correct. But that is what the Wavecom AT Commands manual instructed me. I also have no idea what is "+GCDCONT" (It is not a typo of "+CGDCONT").

So this is from what I can find out so far on the internet:
AT+CGDCONT=1,"IP","Internet"
ATD*99***1#

By using an APN named "internet" it seems you are accessing a APN that connects to the Internet, not to a MMSC or service providers.

Therefore, if I had to connect to WAP gateway, I will have to replace "Internet" with "shwap" (shwap is the APN I need to use)?

Thanks in advance.

freitasm

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Reply # 25472 29-Dec-2005 17:10

The APN you need to use will depend on your operator's configuration...

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darkck05

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Reply # 25473 29-Dec-2005 17:35

Operator's configuration? Do you mean that of the MMSC Service provider?

freitasm

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Reply # 25475 29-Dec-2005 18:40

Well, each operator has its own naming for their APNs. I don't even know what operator you are using, so I can't help with this. You have to get this information from the help desk on the operator.

I am still thinking that what you want to do is not possible through this method.

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darkck05

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Reply # 25937 9-Jan-2006 14:43

OK I researched and tried it out. It seems that we still failed to establish the GPRS connection itself. Here's the commands of what I typed into Hyperterminal:

AT+CGDCONT=1,"IP","shwap";
ATD*99***1#

First the modem displayed "CONNECT 115200", then after it began printing out some garbage lines, repeating it for 10 times before showing "NO CARRIER". What is surprising is that all these will still happen even if I used any nonexistent APN.

So what are the possibilities? Other than the possibility that my "shwap" APN is non-existent too?

Here's an example site that tells me how to set up GPRS/WAP in my area: http://sg.relaxz.com/sg_relaxzpark/jsp/help/help_howtosetupwap.jsp

Could anyone spare a minute or two to explain what is going on? Thanks in advance. :D

freitasm

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Reply # 25938 9-Jan-2006 15:06

I really don't think this works on Hyperterminal - this program will only show you what's up and down the line - it's a terminal program, not a PPP client.

The "garbage" you see is the server trying to communicate with a valid client to establish a connection. Since nothing is going back to the server the connection is terminated.

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darkck05

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Reply # 25977 9-Jan-2006 22:17

You mean that it is actually not possible to establish a GPRS connection (Just the connection, no sending of data yet) through Hyperterminal and AT Commands?

Jama

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Reply # 26016 10-Jan-2006 09:05

If the modem contains an IP stack then it should be possible to establish the connection without sending any data. What the modem should be able to do is open a socket with a server. Generally embedded IP stacks allow you to write the server destination and port number as well as the APN, etc. Then it is a case of just using an AT command to initiate the packet data connection via HyperTerm.

I know this works on the CDMA Wavecom but I do not have a great deal of experience with the GPRS version.