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Re: [lwip-users] lwip adding a pcb into active lsit which is already ins

From: Erkan Ersoy
Subject: Re: [lwip-users] lwip adding a pcb into active lsit which is already inserted
Date: Thu, 8 Sep 2016 20:10:36 +0000 (UTC)

Hello Christian 
Can you expand how did you fix the problem. I have similar problem. 
Thank you 

On Thursday, September 8, 2016 11:37 AM, "address@hidden" <address@hidden> wrote:

I finally fixed this problem. I was using a pcb after it was freed (the error callback freed the pcb) and I also had some synchronity problems. 

What I don´t get is, why does the LWIP code not check if the pcb us already freed? Does it assume it only gets right and working pcbs? 

> I would start by checking that the ethernet driver works, the port
> works, take a known to  work application and make sure that everything
> works.
> If errors arise here, it is quite possible that either the driver is
> buggy or the port is buggy. All calls to low-level functions must be in
> the same thread.
> Once that is checked and confirmed functional, I would continue by
> providing information on what API I am using on my application, and at
> what point something fails, after trying to collect more information
> with a debugger. All calls to the RAW API must be on the same thread.
> Each socket must be used from within one thread (well..., but let's keep
> it simple, and I'm no expert on this)

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