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# 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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