[lwip-users] netconn_new() hangs when link is down

[Bastiaan van Kesteren]

Hi,

Using LwIP 1.4.1, FreeRTOS 6.1.0. Everything working fine.

The problems arrise when the network-link goes down (unplugging the 
cable). I got some LwIP 'client' applications running, all using the 
netconn api. Once the link has been up and goes down, the very next call 
to one of these 'client' applications  causes it to hang;

netconn_new()         ( = netconn_new_with_proto_and_callback() )
   TCPIP_APIMSG()    ( = tcpip_apimsg() )
    sys_arch_sem_wait()

The sys_arch_sem_wait() never returns, the semaphore is never signalled. 
Plugging the network cable back in doesn't resolve the issue, a restart 
is required. I'd much rather have some kind of ERR_CONN return value 
somewhere....

Anyone with idea's about whats going on?

Regards,
-Bastiaan