lwIP is freely available (under a BSD-style license) in C source code format and can be downloaded from the development homepage.
The focus of the lwIP TCP/IP implementation is to reduce the RAM usage while still having a full scale TCP. This makes lwIP suitable for use in embedded systems with tens of kilobytes of free RAM and room for around 40 kilobytes of code ROM.
Since its release, lwIP has spurred a lot of interest and is today being used in many commercial products. lwIP has been ported to multiple platforms and operating systems and can be run either with or without an underlying OS.
lwIP includes the following protocols and 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
- 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
Getting started
If you are new to lwIP, we recommend that you read one of the following manuals:
- lwIP Application Developers Manual, if you are new to lwIP or are trying to build an application on top of an already installed lwIP installation
- lwIP Platform Developers Manual, if you are trying to make lwIP work on your platform, with your OS, and your device driver
- lwIP Developers Manual, if you would like to delve into the innards of lwIP
- Available device drivers, to see if there is a prewritten driver available for your hardware
The following links may also be useful:
- The lwIP Savannah site, and the following subpages:
- git source via web
- contrib git source via web
- the bug tracker
- the mailing lists (be sure to join before writing to the lists)
- "Design and Implementation of the lwIP TCP/IP Stack" (obsolete, but good starting point)
Further reading
- Frequently Asked Questions
- Application notes - a miscellaneous collection of notes, thoughts, and questions deemed valuable
- Release notes - upgrade notes, feature changes or removals, etc.
- Project roadmap - ideas for the future of lwIP
- Projects that use lwIP - applications and projects that use lwIP
from http://lwip.wikia.com/wiki/LwIP_Wiki
-----
lwIP mirror from http://git.savannah.gnu.org/cgit/lwip.git
https://savannah.nongnu.org/projects/lwip/
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://travis-ci.org/lwip-tcpip/lwip
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>from https://github.com/lwip-tcpip/lwip
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