Question

GPRS PPP disconnection problem

Asked by: Kenny_Krupnik

Hi,
I have an embedded device which we developed and we are trying to connect it to a GPRS network via a Nokia 6310i.

The embedded device has an RS-232 port running a TCP/IP stack over PPP (client) - which connects to the Nokia.

The embedded device now sends the appropriete AT commands and then we see that the PPP session starts with the GPRS network, and some information is negotiated such as PAP, magic number, etc. Suddenly (towards the end of the negotiation), the GPRS side (PPP server) sends a request to terminate and the embedded device of course agrees.

We replaced our embedded device with a PC Win2K as a PPP client and everything went OK. Thus we know that our SIM and AT commands are correct. Unfortunetly, we don't have a way to see the PPP negotiation messages between the PC and the other side.

Any help regarding why the GPRS side requested to terminate is very much appreciated.

-- Kenny

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Asked On
2003-12-02 at 06:05:43ID20813873
Tags

embedded

,

gprs

,

terminate

Topic

General Packet Radio Service (GPRS)

Participating Experts
3
Points
125
Comments
5

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Answers

 

by: jmsousaPosted on 2003-12-03 at 03:03:48ID: 9865724

You can see what's going on with Win2K, just open a command line and type:

1. enable PPP logging:

netsh
ras
set tracing PPP enable

2. disable PPP logging:

netsh
ras
set tracing PPP disabled

You can see the log under \WINNT\tracing\PPP.txt.

José Sousa

 

by: software_elicoPosted on 2004-02-11 at 01:00:24ID: 10330440

The phone you are using is already GPRS enabled ,that means it has a TCP/IP stack.
The GPRS will take care of the TCP/IP and the PPP,So you only need a RS232 interface on your embedded device and you can directly connect to the Phone modem,Then start using the AT commands through a terminal software(HYPERTERMINAL) and it should be fine.

The steps are clearly stated in the site:
http://www.gsm-modem.de/gprs-tcp-ip.html

also for your queries you can check the link:
http://www.gsm-modem.de/tcp-ip-gprs.html
 
software_elico

 

by: SimonTayPosted on 2004-02-23 at 08:45:54ID: 10433354

Our externalcommands.jar application on TC45 has a 'netkeeper' class which keeps the GPRS link open.  More information on externalcommands.jar is at http://www.tdc.co.uk/gprs/tc45.htm

20120131-EE-VQP-002

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