Iphone

I am trying to establish a very simple socket communication betwen a client PC and a server PC.

The server has a direct IP on the internet, and is comprised of a vb application that simply listens on port 80 ( raw tcp/ip sockets ) for a string that is expected to be sent by the client with a # char indicating the end.

The client machine is a PC running windows XP and there is a T68i connected at the serial port.
I would like to open a terminal on this client PC, type some at commands and send this string via GPRS. Is it possible ?

Do I need a TCP/IP stack on the client or does t68i already has the stack embedded ? The question is because on a next step, I will have an 8051 microcontroler sending the same AT commands to a serial port where the T68i is connected, and I do not intend to implement a tcp/ip stack on the 8051.

Iphone

First yes it's possible to do your 'proof of concept' test on a client PC.
The following guide shows how to set this up step by step:-

www.vodafone.co.nz/mobiles/wap_guides/ ericsson_t68_handset_guide.pdf

You'll probably need to change the APN to suit your carrier though.
Once connected you can use the GPRS connection just like any other interbet connection.

The T68i does not have an embeddded user accessible TCP stack, so you'lld need to implement PPP and TCP/IP on your 8051 if you need to use the T68i.

There are lots of GSM modem that have a built in TCP stack though, one example is the Sony Ericsson GT47:-

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