Oops...
http://www.nongnu.org/lwip/2_0_0/upgrading.html
* Changed netif "up" flag handling to be an administrative flag (as
opposed to the previous meaning of "ip4-address-valid", a netif will now
not be used for transmission if not up) -> even a DHCP netif has to be
set "up" before starting the DHCP client
My mistake, you seem to be doing things the right way for 2.0+
Please give details about your port and where did you get the code from.
Try to "manually exercise your code" (debug) to see why you are getting
those nulls.
Does it happen right on first call or after a while ?
Your mainloop is ... ?
You are not calling lwIP from within the mainloop and interrupts... are
you ?
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