Re: [lwip-users] lwip 1.2.0 + freeRTOS

[Sirjee Rooplall]

Hi Simon,

I found discussions relating to my problem + it existing in LWIP 1.3.0 in 
this link.
http://www.mail-archive.com/address@hidden/msg05554.html

Well, what I do is I startup, establish a connection to server, get proper 
replies etc, then I simulate this problem by removing the antenna, I then 
trigger a connection using external push button, and what I see in my debug 
out put, is it attempts a netconn_connect which blocks for about 30seconds 
or so, then my code retires another netconn_connect, I do this for three 
retries, and each time netconn_connect returns -3(ERR_ABRT), after this I 
re-connect the antenna, and my software then re-connects to the server, 
firstly to bring PPP up, once that is up, I then try and do a 
netconn_connect and the code crashes.

If I look in my debugger, sorry I am using freeRTOS + ATMEL's UC3 device, it 
crashes at FreeRTOS QueueReceive function which when I dig deeper is pending 
on sys_arch_mbox_fetch.

Is there any application not that would teach me more about proper usage of 
the LWIP API's, and hopefully it will deal with fail states as well.

Thanks in advance.

Kind Regards, Sirjee Rooplall Figment Design laboratories (Pty) Ltd mailto: 
address@hidden Mobile: +27 (0)83 230 8466
----- Original Message ----- 
From: "Simon Goldschmidt" <address@hidden>
To: "Mailing list for lwIP users" <address@hidden>
Sent: Monday, January 25, 2010 3:53 PM
Subject: Re: [lwip-users] lwip 1.2.0 + freeRTOS


> Sirjee Rooplall wrote:
> > Hi Simon,
> >
> > I am new to LWIP, so I copied that code from an example I have seen.
>
> Well, then be so kind and tell the author of that example that it is 
> really a very bad one!
>
> > I removed the sleep and I have removed the access to the internal pcb, 
> > and
> > only rely on the API now.
> >
> > The problem I am explaining, seems to also exist in LWIP 1.3.0, as I have
> > seen in some of the recent lwip archives.
>
> Could you tell us where? Also, the current release is 1.3.2!
>
> > Another thing:
> > Because I am connecting through a PPP->GPRS interface the possibility
> > exists
> > where someone removes the antenna and the connection longer exists,
> > however
> > the user can trigger a server connection externally through a push 
> > button,
> > which will attempt to perform a neconn_connect which blocks and returns
> > with
> > ERR_ABRT(-3), how do I handle this senario without crashing the stack. At
> > the moment, I keep trying every 30 seconds, and eventually I cause the
> > stack
> > to crash with too many netconn_connect without a physical connection
> > available.
>
> Normally, that shouldn't be a problem. What exactly happens when you say 
> the stack 'crashes'?
>
> Oh, and please don't send so much code unless you have a very specific 
> question about it or someone asks you to. People tend to overread mails 
> containing too much code as it's rather difficult to understand...
>
> Simon
> --
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>
>
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