[lwip-devel] [bug #20515] TCP delayed ack does not work as expected

[Kieran Mansley]

Follow-up Comment #10, bug #20515 (project lwip):

If we keep track of the last value advertised we can then send an immediate
update only when:
 - the last value advertised was small; or
 - the change in the available window is large

These two rules combined would effectively mean that we advertise a window
when it would make a difference to the sender (i.e. when it might allow the
sender to send more data) and avoid sending window updates when they'd make
little difference.

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