Re: [lwip-users] howto put tcp packet together

[Bernhard 'Gustl' Bauer]

Kieran Mansley schrieb:
> On Thu, 2009-04-30 at 08:54 +0200, Bernhard 'Gustl' Bauer wrote:
> > A wireshark file is attached. My lwip does only get callbacks for 
> > packets no. 4, 13, 24, 35, ... Packets no. 14, 25, 36, ... don't 
> > generate any callbacks. How can I get the data in these packets? Btw 
> > pcb->next and pbuf->next are always 0!
>
> That sounds very peculiar.  All the received data should be indicated to
> the application.
>
> > TCP says the network packets may be out of order. There is a sequence 
> > number to sort them. Does LWIP take care of this?
>
> Yes.  The whole of TCP is dealt with by lwIP.  You'll just get a stream
> of bytes that is already in the correct order without any network
> headers delivered to the application in arbitrary chunks.

Packet no. 13 has 377 bytes, packet no. 14 has 44 bytes. This is 
reported by DEBUG messages:
tcp_recved: received 377 bytes, wnd 24000 (0).
tcp_recved: received 44 bytes, wnd 24000 (0).

So should I get 2 callbacks with pbufs of 377 and 44 bytes, or 1 
callback with 2 pbufs of 377 and 44 bytes, or 1 callback with 1 pbuf of 
421 bytes?

Gustl