Re: [lwip-users] Handling sudden disappearance of network i/f

[Janusz U.]

> > I added
> >   pxSRVconn = netconn_new(NETCONN_TCP);          // init conn
> >   if (pxSRVconn != NULL)
> >    if (pxSRVconn->pcb.tcp != NULL)
> >     pxSRVconn->pcb.tcp->so_options |= SO_KEEPALIVE;      // turn on
> > keep-alive
> >
> > and not keep-alive is working.
>
> How are you testing it?

I have microcontroler Atmel AT91SAM7S256. At the platform works almost 
original FreeRTOS 4.1.0 + lwIP1.1.1 + modified the BSD-PPP. WinARM includes 
GNU GCC 4.1.1.

> > But I don't understand why when I close
> > socket on my windows serwer the lwIP does not notify that. Only when I 
> > close
> > my serwer the lwIP close too (RST state?).
>
> I'm not sure about this bit.  What do you expect lwIP to do when your
> server closes the connection?

I expect the lwIP close the "socket" too after server closing. In this 
moment lwIP do nothing and still is waiting at netconn_recv

> How does lwIP's behaviour differ from
> other stacks?  The connection will not be closed until your application
> also closes it - the server closing does not mean the client can't still
> use the connection.

when serwer close socket client get message to finalize data exchanging and 
closes the socket too.

best regards
Janusz