RE: [lwip-users] Simultaneous TCP client and server on same platform

[Kieran Mansley]

On Mon, 2008-01-21 at 12:13 +0000, Kieran Mansley wrote:
> On Mon, 2008-01-21 at 11:45 +0000, Muhamad Ikhwan Ismail wrote:
> > 
> > I am quite sure that is not the case, since I dont have a strict
> > memory restriction
> > I have allocated each kind of pcb with 40 and according to lwip stats
> > I only used
> > 3, 1 UDP and 2 TCP.
> > 
> 
> Try turning on the LWIP_DEBUGF statements.  You should then get a reason
> for the reset in the form or a print statement.
> 
> The most likely one from what you describe is the reset sent at line 628
> of file lwip/src/core/tcp_in.c.  This is triggered if the ACK in the SYN
> handshake has the wrong ACK number, but from the trace you provide that
> doesn't seem to be the case.

I missed a more likely explanation: if the accept callback function
returns an error the connection is aborted, which sends a RST.  Which
API are you using?  Have you requested a callback when a connection is
accepted?

Kieran