Re: [lwip-users] opening multiple sockets fails

[Dennis Borgmann]

Hi!

This was the error:

 #define MEMP_NUM_UDP_PCB        1

It needs to be set to

 #define MEMP_NUM_UDP_PCB        2

then multiple connections are possible.

Best regards,
Dennis

Am 19.10.2011 10:56, schrieb Simon Goldschmidt:
> Dennis Borgmann<address@hidden>  wrote:
> > It seems like lwIP does not like this. As soon as I open more than one
> > socket, the return value of socket is negative.
> a) A more detailed error number is saved in 'errno'. You should try to get that 
> value somehow to see what's wrong (error numbers are defined in arch.h).
> b) It could be that you just have configured available memory too low. In that case, 
> available resources wouldn't allow you to create a 2nd socket. In that case, you should 
> go through lwipopts.h and increase the some configuration options (see comments in opt.h 
> and the lwip wiki - "http://lwip.wikia.com/wiki/Lwipopts.h"; - for an 
> explanation).
>
> Simon