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    README
    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) 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 'lwip' Git module and
    contributions (such as platform ports) are in the 'contrib' Git module.
    
    See doc/savannah.txt for details on Git server access for users and
    developers.
    
    The current Git trees are web-browsable:
      http://git.savannah.gnu.org/cgit/lwip.git
      http://git.savannah.gnu.org/cgit/lwip/lwip-contrib.git
    
    Submit patches and bugs via the lwIP project page:
      http://savannah.nongnu.org/projects/lwip/
    
    Continuous integration builds (GCC, clang):
      https://travis-ci.org/yarrick/lwip-merged
    
    
    DOCUMENTATION
    
    Self documentation of the source code is regularly extracted from the current
    Git sources and is available from this web page:
      http://www.nongnu.org/lwip/
    
    There is now a constantly growing 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/
    
    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>
    

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