api/      - The code for the high-level wrapper API. Not needed if            you use the lowel-level call-back/raw API.core/     - The core of the TPC/IP stack; protocol implementations,            memory and buffer management, and the low-level raw API.	    include/  - lwIP include files.netif/    - Generic network interface device drivers are kept here,            as well as the ARP module.For more information on the various subdirectories, check the FILESfile in each directory.