[avahi] What triggers a service to send it's information

[Alexander Rössler]

Someone new joined the multicast group the embedded system is subscribed
to.

See also the description of querierd for more info why this works one
some but not all networks: (my fork:
https://github.com/machinekoder/querierd )

avahi at radolfstrasse.de writes:

> Hi everyone,
> I am trying to understand the mechanics of avahi and wonder what makes a
> service to send it's information.
>
> I am currently looking at the network traffic using wireshark/tcpdump.
> After starting avahi-daemon and avahi-discover  I see in the network log
> that my photo-voltaic inverter sends a "Standard query resonse" containing
> its name "_http._tcp.local"  and domain name "pvserver._http._tcp.local".
>
> But I cannot understand what triggers that embedded system to send it's
> information.
>
> Thanks for any insights.
> Tobias
>
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