[lwip-devel] [bug #36494] tcp_recved is not called when a remote TCP connection is closed

[Bill Auerbach]

Follow-up Comment #1, bug #36494 (project lwip):

Turns out this can be (is on WinXP) caused by setting SOCKOPT SO_LINGER.  I
didn't know this causes a Reset.

However, my code is handling tcp_err and tcp_recevd callbacks to clean up my
wrapper around a tcp_pcb and the tcp_err callback is not called every time
when the remote resets.  As my code hasn't changed on the PC or target I
believe this behavior is fairly new.  I never got out of sync with my wrapper
in a state with the TCP connection that was open while lwIP knew it was
closed.  This is why I got into this debugging in the first place - I had rare
occurrences of being out of sync - I thought the TCP connection was open while
lwIP had the reset and knew it was closed because of a missed tcp_err
callback.

I believe some testing should be done by others: Resetting the remote
connection and seeing that the tcp_err callback is made every time.

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