Re: [lwip-users] TCP windows Full

[Kieran Mansley]

On Mon, 2011-07-11 at 13:43 +0200, brak brak2 wrote:
> What can by cause that lwip doesn't send windows update packets? 

Lack of pbufs to send a packet?  An error called tcp_recved() (although
you say this is not the problem)?  The fact that even after a long idle
period the advertised window is not getting back to 4096 (its starting
value) suggests to me that there could well be a problem with your use
of tcp_recved().

For full details of when lwIP will send an explicit window update, take
a look at the source (start in tcp_recved()), but to summarise: if we
can increase the advertised window by a significant amount (e.g. 1 MSS)
then we do.

Kieran