[lwip-devel] [bug #52747] mdns resp: separate the announce function and add netifapi support for it

[Douglas]

Follow-up Comment #6, bug #52747 (project lwip):

> Well, not exactly maybe. That would break layering. mdns should work as
callback app without tcpip thread support, too...

It seems to work well using 'tcpip_callback()', and with a 'pending' flag it
can even avoid some redundant announcements.

Could 'tcpip_callback()' be extended to work in the NO_SYS case too, in a
similar way that the timers are currently checked by calling
'sys_check_timeouts()' in the event loop?

These callback might be useful even for NO_SYS as this might defer a heavy
operation and this might help with latency for some operations and help reduce
the peak resource usage. In any case it might be a small burden for NO_SYS
that helps keep the large code cleaner.

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