Lower layer TCP interface

TCP provides a simple interface to the lower layers of the system. During system initialization, the function tcp_init() has to be called before any other TCP function is called. When the system is running, the two timer functions tcp_fasttmr() and tcp_slowtmr() must be called at regular intervals. The tcp_fasttmr() should be called every TCP_FAST_INTERVAL milliseconds (defined in tcp.h, and currently 250ms) and tcp_slowtmr() should be called every TCP_SLOW_INTERVAL milliseconds, currently 500ms.

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