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110 lines
4.0 KiB
Plaintext
110 lines
4.0 KiB
Plaintext
INTRODUCTION
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lwIP is a small independent implementation of the TCP/IP protocol suite.
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The focus of the lwIP TCP/IP implementation is to reduce the RAM usage
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while still having a full scale TCP. This making lwIP suitable for use
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in embedded systems with tens of kilobytes of free RAM and room for
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around 40 kilobytes of code ROM.
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lwIP was originally developed by Adam Dunkels at the Computer and Networks
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Architectures (CNA) lab at the Swedish Institute of Computer Science (SICS)
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and is now developed and maintained by a worldwide network of developers.
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FEATURES
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* IP (Internet Protocol, IPv4 and IPv6) including packet forwarding over
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multiple network interfaces
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* ICMP (Internet Control Message Protocol) for network maintenance and debugging
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* IGMP (Internet Group Management Protocol) for multicast traffic management
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* MLD (Multicast listener discovery for IPv6). Aims to be compliant with
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RFC 2710. No support for MLDv2
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* ND (Neighbor discovery and stateless address autoconfiguration for IPv6).
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Aims to be compliant with RFC 4861 (Neighbor discovery) and RFC 4862
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(Address autoconfiguration)
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* DHCP, AutoIP/APIPA (Zeroconf), ACD (Address Conflict Detection)
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and (stateless) DHCPv6
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* UDP (User Datagram Protocol) including experimental UDP-lite extensions
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* TCP (Transmission Control Protocol) with congestion control, RTT estimation
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fast recovery/fast retransmit and sending SACKs
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* raw/native API for enhanced performance
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* Optional Berkeley-like socket API
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* TLS: optional layered TCP ("altcp") for nearly transparent TLS for any
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TCP-based protocol (ported to mbedTLS) (see changelog for more info)
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* PPPoS and PPPoE (Point-to-point protocol over Serial/Ethernet)
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* DNS (Domain name resolver incl. mDNS)
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* 6LoWPAN (via IEEE 802.15.4, BLE or ZEP)
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APPLICATIONS
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* HTTP server with SSI and CGI (HTTPS via altcp)
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* SNMPv2c agent with MIB compiler (Simple Network Management Protocol), v3 via altcp
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* SNTP (Simple network time protocol)
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* NetBIOS name service responder
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* MDNS (Multicast DNS) responder
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* iPerf server implementation
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* MQTT client (TLS support via altcp)
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LICENSE
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lwIP is freely available under a BSD license.
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DEVELOPMENT
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lwIP has grown into an excellent TCP/IP stack for embedded devices,
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and developers using the stack often submit bug fixes, improvements,
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and additions to the stack to further increase its usefulness.
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Development of lwIP is hosted on Savannah, a central point for
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software development, maintenance and distribution. Everyone can
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help improve lwIP by use of Savannah's interface, Git and the
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mailing list. A core team of developers will commit changes to the
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Git source tree.
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The lwIP TCP/IP stack is maintained in the 'lwip' Git module and
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contributions (such as platform ports) are in the 'contrib' Git module.
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See doc/savannah.txt for details on Git server access for users and
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developers.
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The current Git trees are web-browsable:
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http://git.savannah.gnu.org/cgit/lwip.git
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http://git.savannah.gnu.org/cgit/lwip/lwip-contrib.git
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Submit patches and bugs via the lwIP project page:
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http://savannah.nongnu.org/projects/lwip/
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Continuous integration builds (GCC, clang):
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https://travis-ci.org/lwip-tcpip/lwip
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DOCUMENTATION
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Self documentation of the source code is regularly extracted from the current
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Git sources and is available from this web page:
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http://www.nongnu.org/lwip/
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Also, there are mailing lists you can subscribe at
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http://savannah.nongnu.org/mail/?group=lwip
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plus searchable archives:
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http://lists.nongnu.org/archive/html/lwip-users/
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http://lists.nongnu.org/archive/html/lwip-devel/
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There is a wiki about lwIP at
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http://lwip.wikia.com/wiki/LwIP_Wiki
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You might get questions answered there, but unfortunately, it is not as
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well maintained as it should be.
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lwIP was originally written by Adam Dunkels:
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http://dunkels.com/adam/
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Reading Adam's papers, the files in docs/, browsing the source code
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documentation and browsing the mailing list archives is a good way to
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become familiar with the design of lwIP.
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Adam Dunkels <adam@sics.se>
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Leon Woestenberg <leon.woestenberg@gmx.net>
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