doxygen/ - Configuration files and scripts to create the lwIP doxygen source documentation (found at http://www.nongnu.org/lwip/)savannah.txt - How to obtain the current development source code.contrib.txt - How to contribute to lwIP as a developer.rawapi.txt - The documentation for the core API of lwIP. Also provides an overview about the other APIs and multithreading.sys_arch.txt - The documentation for a system abstraction layer of lwIP.ppp.txt - Documentation of the PPP interface for lwIP.