| INTRODUCTION |
| |
| lwIP is a small independent implementation of the TCP/IP protocol |
| suite that has been developed by Adam Dunkels at the Computer and |
| Networks Architectures (CNA) lab at the Swedish Institute of Computer |
| Science (SICS). |
| |
| The focus of the lwIP TCP/IP implementation is to reduce the RAM usage |
| while still having a full scale TCP. This making lwIP suitable for use |
| in embedded systems with tens of kilobytes of free RAM and room for |
| around 40 kilobytes of code ROM. |
| |
| FEATURES |
| |
| * IP (Internet Protocol) including packet forwarding over multiple network |
| interfaces |
| * ICMP (Internet Control Message Protocol) for network maintenance and debugging |
| * IGMP (Internet Group Management Protocol) for multicast traffic management |
| * UDP (User Datagram Protocol) including experimental UDP-lite extensions |
| * TCP (Transmission Control Protocol) with congestion control, RTT estimation |
| and fast recovery/fast retransmit |
| * Specialized raw/native API for enhanced performance |
| * Optional Berkeley-like socket API |
| * DNS (Domain names resolver) |
| * SNMP (Simple Network Management Protocol) |
| * DHCP (Dynamic Host Configuration Protocol) |
| * AUTOIP (for IPv4, conform with RFC 3927) |
| * PPP (Point-to-Point Protocol) |
| * ARP (Address Resolution Protocol) for Ethernet |
| |
| LICENSE |
| |
| lwIP is freely available under a BSD license. |
| |
| DEVELOPMENT |
| |
| lwIP has grown into an excellent TCP/IP stack for embedded devices, |
| and developers using the stack often submit bug fixes, improvements, |
| and additions to the stack to further increase its usefulness. |
| |
| Development of lwIP is hosted on Savannah, a central point for |
| software development, maintenance and distribution. Everyone can |
| help improve lwIP by use of Savannah's interface, CVS and the |
| mailing list. A core team of developers will commit changes to the |
| CVS source tree. |
| |
| The lwIP TCP/IP stack is maintained in the 'lwip' CVS module and |
| contributions (such as platform ports) are in the 'contrib' module. |
| |
| See doc/savannah.txt for details on CVS server access for users and |
| developers. |
| |
| Last night's CVS tar ball can be downloaded from: |
| http://savannah.gnu.org/cvs.backups/lwip.tar.gz [CHANGED - NEEDS FIXING] |
| |
| The current CVS trees are web-browsable: |
| http://savannah.nongnu.org/cgi-bin/viewcvs/lwip/lwip/ |
| http://savannah.nongnu.org/cgi-bin/viewcvs/lwip/contrib/ |
| |
| Submit patches and bugs via the lwIP project page: |
| http://savannah.nongnu.org/projects/lwip/ |
| |
| |
| DOCUMENTATION |
| |
| The original out-dated homepage of lwIP and Adam Dunkels' papers on |
| lwIP are at the official lwIP home page: |
| http://www.sics.se/~adam/lwip/ |
| |
| Self documentation of the source code is regularly extracted from the |
| current CVS sources and is available from this web page: |
| http://www.nongnu.org/lwip/ |
| |
| There is now a constantly growin wiki about lwIP at |
| http://lwip.wikia.com/wiki/LwIP_Wiki |
| |
| Also, there are mailing lists you can subscribe at |
| http://savannah.nongnu.org/mail/?group=lwip |
| plus searchable archives: |
| http://lists.nongnu.org/archive/html/lwip-users/ |
| http://lists.nongnu.org/archive/html/lwip-devel/ |
| |
| Reading Adam's papers, the files in docs/, browsing the source code |
| documentation and browsing the mailing list archives is a good way to |
| become familiar with the design of lwIP. |
| |
| Adam Dunkels <adam@sics.se> |
| Leon Woestenberg <leon.woestenberg@gmx.net> |
| |
