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.