Looking for communication lib

Hello, I developed with C a simple communication program between my Palm and a PC application running as server. I use simple AT commands to call the PC's modem and to establish a communication channel. Then I use a protocol I invented to login and exchange data with the server.

Basically, this protocol is layered in subprotocols: a protocol to format packets of data with error check data ( a simple checksum ) is the lower protocol, while higher protocols exchange files and implement server autentication.

My question is: can I do the same thing ( point to point communication using modems ) by using an existent communication library? Does such a library exist? Can anyone give me a hint on a simple and robust communication library to use to implement a server waiting for a client call?

Thank you all for the help,
BrownB

My guess would be to look round here first.
http://www.palmsource.com/

Thank you for the suggestion, but I need of an "abstract" communication library, so that I can use it to build a Client on a PalmOS system and a Server on a WinXP server.

Also, I'd like more to have an opensource library, so that I can study it and if possible personalize it.

My little lib works, but it's too simple to make a secure connection. I can ecnrypt data, I implemented also this service, but I'd like to get a "professional" comm. library, which should be more secure, more efficient and more stable.

Thank you for any suggestion by your experience,
BrownB

The PPP protocol is supported by kernel routines in Linux, for example.

Here is an overview of what the 2.4 Linux kernel does with PPP:

http://www.baty.hanse.de/linux-x25/s...ess/node3.html

Get kernel source for Linux (part of every distro) and start digging. I do not know of a standalone PPP library, except for TeleSoft's source code library - but it is licensed.