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

[Frédéric Bernon]

Follow-up Comment #32, bug #20409 (project lwip):

>Do we want to let the netif be up'd or down'd manually? Why would we allow
that to happen?

manually up/down a netif is a basic operation on lwIP. Any embedded
application can decide to down its netif if it want to "stop" any services
activity...

>This whole up/down thing is a new feature to lwIP. We can define its
behavior however we want, but in the future we will have to provide
backwards-compatibility for it. I want to make sure we do this right the
first time around. 

Yes, but the initial impact have to be less intrusive as possible. Change
timers is not a big job to do. But I'm not sure it's really something to
change in next "1.3.0"...

>I say the timers idea is a bit too decentralized -- we have to handle the
static IP case as well, and that has no timers.

For a static IP, there is only gratuitous ARP (but it will be a synchrone
call) and IGMP's reports (and there is already a timer).



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