| 1 | INTRODUCTION
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| 2 |
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| 3 | lwIP is a small independent implementation of the TCP/IP protocol
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| 4 | suite that has been developed by Adam Dunkels at the Computer and
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| 5 | Networks Architectures (CNA) lab at the Swedish Institute of Computer
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| 6 | Science (SICS).
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| 7 |
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| 8 | The focus of the lwIP TCP/IP implementation is to reduce the RAM usage
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| 9 | while still having a full scale TCP. This making lwIP suitable for use
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| 10 | in embedded systems with tens of kilobytes of free RAM and room for
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| 11 | around 40 kilobytes of code ROM.
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| 12 |
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| 13 | FEATURES
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| 14 |
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| 15 | * IP (Internet Protocol) including packet forwarding over multiple
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| 16 | network interfaces
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| 17 | * ICMP (Internet Control Message Protocol) for network maintenance
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| 18 | and debugging
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| 19 | * UDP (User Datagram Protocol) including experimental UDP-lite
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| 20 | extensions
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| 21 | * TCP (Transmission Control Protocol) with congestion control, RTT
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| 22 | estimation and fast recovery/fast retransmit
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| 23 | * Specialized API for enhanced performance
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| 24 | * Optional Berkeley socket API
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| 25 |
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| 26 | LICENSE
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| 27 |
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| 28 | lwIP is freely available under a BSD license.
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| 29 |
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| 30 | DEVELOPMENT
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| 31 |
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| 32 | lwIP has grown into an excellent TCP/IP stack for embedded devices,
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| 33 | and developers using the stack often submit bug fixes, improvements,
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| 34 | and additions to the stack to further increase its usefulness.
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| 35 |
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| 36 | Development of lwIP is hosted on Savannah, a central point for
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| 37 | software development, maintenance and distribution. Everyone can
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| 38 | help improve lwIP by use of Savannah's interface, CVS and the
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| 39 | mailing list. A core team of developers will commit changes to the
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| 40 | CVS source tree.
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| 41 |
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| 42 | The lwIP TCP/IP stack is maintained in the 'lwip' CVS module and
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| 43 | contributions (such as platform ports) are in the 'contrib' module.
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| 44 |
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| 45 | See doc/savannah.txt for details on CVS server access for users and
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| 46 | developers.
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| 47 |
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| 48 | Last night's CVS tar ball can be downloaded from:
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| 49 | http://savannah.gnu.org/cvs.backups/lwip.tar.gz [CHANGED - NEEDS FIXING]
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| 50 |
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| 51 | The current CVS trees are web-browsable:
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| 52 | http://savannah.nongnu.org/cgi-bin/viewcvs/lwip/lwip/
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| 53 | http://savannah.nongnu.org/cgi-bin/viewcvs/lwip/contrib/
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| 54 |
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| 55 | Submit patches and bugs via the lwIP project page:
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| 56 | http://savannah.nongnu.org/projects/lwip/
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| 57 |
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| 58 |
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| 59 | DOCUMENTATION
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| 60 |
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| 61 | The original out-dated homepage of lwIP and Adam Dunkels' papers on
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| 62 | lwIP are at the official lwIP home page:
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| 63 | http://www.sics.se/~adam/lwip/
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| 64 |
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| 65 | Self documentation of the source code is regularly extracted from the
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| 66 | current CVS sources and is available from this web page:
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| 67 | http://www.nongnu.org/lwip/
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| 68 |
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| 69 | Reading Adam's papers, the files in docs/, browsing the source code
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| 70 | documentation and browsing the mailing list archives is a good way to
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| 71 | become familiar with the design of lwIP.
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| 72 |
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| 73 | Adam Dunkels <[email protected]>
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| 74 | Leon Woestenberg <[email protected]>
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