[lwip-users] opening multiple sockets fails

[Dennis Borgmann]

Hello lwIP-users!

I am working on a small project with the AVR32UC3A-processor from Atmel. 
Everything's fine so far and it is really nice to see an implementation 
like lwIP.

I tried to run an example available within AVRStudio5, a simple 
tftp-Server, and within this project, I tried to open multiple sockets 
at a time.

The example uses lwIP-1.3.2.

It seems like lwIP does not like this. As soon as I open more than one 
socket, the return value of socket is negative.

Doing this won't work:

    t = socket(AF_INET, SOCK_DGRAM, 0);
    if (t < 0) {
        vParTestSetLED( 6 , pdTRUE );
        return;
    }
    s = socket(AF_INET, SOCK_DGRAM, 0);
    if (s < 0) {
        vParTestSetLED( 7 , pdTRUE ); //grün
        return;
    }

The system I am working on (Atmel EVK1100) will light up LED No 7, which 
means, the second socket-call fails.

What might be the problem? Is there a restriction within lwIP regarding 
the amount of possible open sockets?

Thanks a lot for any help!

Dennis