lwIP is a lightweight implementation of the TCP/IP protocol stack. The focus of
the lwIP TCP/IP implementation is to reduce RAM usage, thus making lwIP
suitable for use in embedded systems with very limited resources.
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The operating system emulation layer was redesigned to make porting easier. Better control over TCP output buffers was added. Locking problems in buffer management and bugs in the sequential API have been fixed. A problem potentially causing IP forwarding to leak memory was fixed. Documentation was added.