Re: [lwip-users] Cannot create netconn

[Emil Ohlsson]

Thanks!

I found the error, for some reason DEFAULT_UDP_RECVMBOX_SIZE was defaulted to 0.

Emil

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Kieran Mansley
Sent: den 4 augusti 2011 12:27
To: Mailing list for lwIP users
Subject: Re: [lwip-users] Cannot create netconn

On Thu, 2011-08-04 at 11:57 +0200, Emil Ohlsson wrote:
> I'm having trouble creating a netconn connection. When I run the code 
> below
> 
>         struct netconn *srv, *cli;
> 
>         cli = netconn_new(NETCONN_UDP);
>         if ( cli == NULL ) {
>                 // This is where I end up.
>         }
> Netconn_new returns NULL, and I have concluded that this is because 
> netconn_alloc returns NULL. My guess is that I have done some bad 
> memory configuration, but I have no idea how. I have attached my 
> lwipopts.h at the end of this mail. I'm running lwIP 1.3.2 on a TI 
> Stellaris Cortex M3 (LM3S9B96).

Your lwipopts.h doesn't specify a value for MEMP_NUM_NETCONN so it will be 
using the default for your port.  The standard default in lwIP for this value 
is 4, so I would expect you to be able to establish 4 connections.  If that's 
not the case, and you're always getting NULL even if there are no connections 
already, then there's something else going wrong and you'll have to dig deeper.

Kieran


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