[lwip-users] [lwip] Re: receive window updation

[Adam Dunkels]

Hi!

On Thursday 16 May 2002 11.39, you wrote:
> lwip updates rcv_wnd through tcp_recved function which is to be called by
> application layer.
> * But what is the idea in sending an ack in this function?

The ACK is sent to inform the peer of the new window size. When the peer
receives the new window information, it may be able to send more data. Since
the application might be slower than the stack, the stack might have sent out
an ACK that advertised a smaller window, and therefore a new ACK has to be
sent.

/adam
-- 
Adam Dunkels <address@hidden>
http://www.sics.se/~adam
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