Re: [lwip-users] How to force-close a netconn from the server side?

[Freddie Chopin]

On Thu, 2017-01-26 at 15:42 +0100, address@hidden wrote:
> > [..] It works only if I
> > introduce a small delay between close+delete and opening of new
> > listen
> > connections (I'm using a multithreading system).[..]
> > With this code the PCBs are only sometimes stuck in TIME_WAIT state
> > for
> > ~2 minutes. But if I remove the "sleepFor()" call, then there is a
> > PCB
> > (maybe more than one) stuck in FIN_WAIT_1 forever.
> 
> That's not strange, and has nothing to do with the tcpip-thread
> running 
> but with receiving the remote host's FIN+ACK.
> FIN_WAIT_1 says that our FIN has been sent while TIME_WAIT says the 
> FIN+ACK has been received (and ACKed) so the
> connection is fully closed.

But what difference in reception does it make - in both cases
(with/without delay) the netconns are closed and deleted anyway. The
only difference is that in the "working" case I wait for a second
before establishing new listening netconns, while in the "failing" case
I try to bind them immediately (which fails without SO_REUSE).

Regards,
FCh