[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 )

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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