| INTRODUCTION | |
| lwIP is a small independent implementation of the TCP/IP protocol suite. | |
| 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. | |
| lwIP was originally developed by Adam Dunkels at the Computer and Networks | |
| Architectures (CNA) lab at the Swedish Institute of Computer Science (SICS) | |
| and is now developed and maintained by a worldwide network of developers. | |
| FEATURES | |
| * IP (Internet Protocol, IPv4 and IPv6) 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 | |
| * MLD (Multicast listener discovery for IPv6). Aims to be compliant with | |
| RFC 2710. No support for MLDv2 | |
| * ND (Neighbor discovery and stateless address autoconfiguration for IPv6). | |
| Aims to be compliant with RFC 4861 (Neighbor discovery) and RFC 4862 | |
| (Address autoconfiguration) | |
| * DHCP, AutoIP/APIPA (Zeroconf), ACD (Address Conflict Detection) | |
| and (stateless) DHCPv6 | |
| * UDP (User Datagram Protocol) including experimental UDP-lite extensions | |
| * TCP (Transmission Control Protocol) with congestion control, RTT estimation | |
| fast recovery/fast retransmit and sending SACKs | |
| * raw/native API for enhanced performance | |
| * Optional Berkeley-like socket API | |
| * TLS: optional layered TCP ("altcp") for nearly transparent TLS for any | |
| TCP-based protocol (ported to mbedTLS) (see changelog for more info) | |
| * PPPoS and PPPoE (Point-to-point protocol over Serial/Ethernet) | |
| * DNS (Domain name resolver incl. mDNS) | |
| * 6LoWPAN (via IEEE 802.15.4, BLE or ZEP) | |
| APPLICATIONS | |
| * HTTP server with SSI and CGI (HTTPS via altcp) | |
| * SNMPv2c agent with MIB compiler (Simple Network Management Protocol), v3 via altcp | |
| * SNTP (Simple network time protocol) | |
| * NetBIOS name service responder | |
| * MDNS (Multicast DNS) responder | |
| * iPerf server implementation | |
| * MQTT client (TLS support via altcp) | |
| 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, Git and the | |
| mailing list. A core team of developers will commit changes to the | |
| Git source tree. | |
| The lwIP TCP/IP stack is maintained in the 'src' directory and | |
| contributions (such as platform ports and applications) are in | |
| the 'contrib' directory. | |
| See doc/savannah.txt for details on Git server access for users and | |
| developers. | |
| The current Git tree is web-browsable: | |
| https://git.savannah.gnu.org/cgit/lwip.git | |
| Submit patches and bugs via the lwIP project page: | |
| https://savannah.nongnu.org/projects/lwip/ | |
| Continuous integration builds (GCC, clang): | |
| https://github.com/lwip-tcpip/lwip/actions | |
| DOCUMENTATION | |
| Self documentation of the source code is regularly extracted from the current | |
| Git sources and is available from this web page: | |
| https://www.nongnu.org/lwip/ | |
| Also, there are mailing lists you can subscribe at | |
| https://savannah.nongnu.org/mail/?group=lwip | |
| plus searchable archives: | |
| https://lists.nongnu.org/archive/html/lwip-users/ | |
| https://lists.nongnu.org/archive/html/lwip-devel/ | |
| There is a wiki about lwIP at | |
| https://lwip.wikia.com/wiki/LwIP_Wiki | |
| You might get questions answered there, but unfortunately, it is not as | |
| well maintained as it should be. | |
| lwIP was originally written by Adam Dunkels: | |
| http://dunkels.com/adam/ | |
| 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> |