RE : RE : [lwip-users] LWIP, PPP and GPRS

[VANSTAEN Laurent RD-MAPS-GRE]

Like you my AT commands are implemented in another part of the software, they are not mixed up with LWIP nor PPP. I can trace what I send to the modem, and what the modem answers. It don't think it goes wrong because of the AT part, it doesn't work because the PPP session between my laptop and the operator doesn't start correctly. I should negociate a dynamic IP address for my modem during this PPP session and this negociation doesn't occur. In fact LWIP sends some LCP Request Config packets but the operator never answers. I do not understand why.

 

Regards

 

Laurent Vanstaen

-----Message d'origine-----
De : address@hidden [mailto:address@hidden De la part de Erik
Envoyé : mercredi 28 juillet 2004 09:59
À : address@hidden
Objet : RE : [lwip-users] LWIP, PPP and GPRS

If you're getting a normal CONNECT when using a terminal program, you should be able to get the same results using lwip. I am using lwip, together with my own implementation of PPP. AT commands I use to get the PDP context are implemented in yet another part of the software, as they have nothing to do with PPP.

Are you able to monitor what your program is sending to the modem? (Split serial cable)

By doing that you should be able to see the differences and decide what is wrong

Regards

Erik

 

Original message:

Hi,
   I've used the following AT commands to establish a PDP context :

ATZ
AT+CFUN=1
AT+CMEE=2
AT+CPIN="0000"
AT+CREG=1
AT+CGDCONT=1,,"network_name"
ATD*99***1#

And it works perfectly on a hyperterminal. The same thing through LWIP, PPP and my GPRS module doesn't work.

Thanks,

Regards,

Laurent