[lwip-devel] [bug #20409] Add netif callback function for link change event

[Simon Goldschmidt]

Follow-up Comment #48, bug #20409 (project lwip):

Coming back to the original problem:

After all I don't really understand what's wrong with the current UP/DOWN...
If you want a netif to stay down, stop dhcp & autoip and set it down! If you
want it up, either call netif_set_up yourself or call dhcp_start (or
autoip_something, I don't really know that part, yet).

I agree we need to do something if the link comes back
(dhcp/autoip/gratuitous arp). If it is down we simply return errors.

The only thing you'd need an indication that the netif is down would be to
save power. I agree that this can't be done easily with lwIP but it _can_ be
done in most cases since you write the application yourself, so you control
the netif up/down/dhcp state. After all, lwIP is still supposed to be 'lw'...
:-)

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