[lwip-users] exception in the second call to netconn_bind

[David Shmelzer]

Thanks for pointing me to the example in lwIP.pdf

I copied the example from the lwIP.pdf verbatim into a test function
that I execute twice. The second time through I get an exception in
netconn_bind().

The exception occurs in the first 'for' loop in tcp_bind(). 
The cause of the exception is cpcb->next ends up as 0x00000400 instead
of NULL.

  for(cpcb = (struct tcp_pcb *)tcp_listen_pcbs.pcbs;
      cpcb != NULL; cpcb = cpcb->next) {

That's as far as I've debugged for now.
Any ideas as to where I should look next?

I am using the raw API as well as the netconn API. Is this allowed?
I first open a listening port using the raw API, then attempt to open
and close another listening port using the netconn API as described
above. 

-Dave