lwIP is a light-weight implementation of the TCP/IP protocol suite that was originally written by Adam Dunkels of the Swedish Institute of Computer Science but now is being actively developed by a team of developers distributed world-wide headed by Leon Woestenberg.
Since it's release, lwIP very interesting and and today is being used in many commercial products. lwIP has been ported to several platforms and operating systems and can be run either with or without an underlying OS.
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.
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Here are some key features of "lwIP":
· IP (Internet Protocol) including packet forwarding over multiple network interfaces
· ICMP (Internet Control Message Protocol) for network maintenance and debugging
· UDP (User Datagram Protocol) for datagram data
· TCP (Transmission Control Protocol) with congestion control, RTT estimation and fast recovery/fast retransmit
· Specialized no-copy API for enhanced performance
· Optional Berkeley socket API
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