Re: [lwip-users] Avoid connection close by lwIP server

[Sylvain Rochet]

Hi Satz,


On Mon, Dec 16, 2013 at 12:18:57PM +0100, Satz Klauer wrote:
> 
> OK, to avoid misunderstandigs: I do NOT want to have a 
> HTTP-connection, I just used this example as starting point and to 
> test my underlying implementation.

Yep, that wasn't clear enough :-)


> Finally the whole thing shall become a plain TCP/IP connection where 
> client and lwIP-server communicate with each other over a longer time 
> and where connection is NOT closed after every response from server.
> 
> I know the http-example that comes with lwIP does this in a completely
> different way and I have to modify this example. The only thing I want
> to know and I did not understand until now: where in this example is
> the connection closed?

Given the lwIP raw API, connection is closed by/when:

a.  http_err() (which is the error callback previously set by tcp_err())
b.  tcp_close() (server initiating the shutdown)
c.  http_recv() which calls http_close_conn() if something went wrong
    or client closed the connection (pbuf is null)

Sylvain

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