Re: [lwip-users] disconnect - connect delay

[Kieran Mansley]

On 1 Apr 2011, at 16:46, brak brak2 wrote:

> I'm not a TCP/IP or HTTP expert but I think it is possible to response
> for SYN packet of second connection just after first one drops. Then
> it would work as fast as my microcontroller can.

It would make the behaviour of the stack very specialised for your particular 
use case.  It would require that the stack knew that you wanted to do it that 
way, and for it to know that the SYN was for your PCB, and that you already had 
an active connection accepted via the same PCB.  None of these are usually of 
concern to the stack when a SYN arrives.

Going back to the start, can you explain why you need to limit it to a single 
connection?  Is it just that there is little memory and so you don't want extra 
connections using it up?

It sounds like what you want is for the stack to accept the incoming 
connection, but for your server to not have to do anything with it until it is 
ready.  Perhaps you could allow more than one connection, and just process them 
serially in your web server?  E.g. whenever the accept callback is called, put 
the new PCB in a list but do nothing with it, and whenever a connection is 
closed pull the oldest PCB off the list and start using that one, and so on.

Kieran