Probing before announcing is not implemented

[soundprojects]

It seems like libmdns does not probe on startup according to the mdns specification

When a service is registrered, the 'send_unsollicited' function is triggered but this sends out a Query Response out to the multicast group

Shouldn't we first send a few rounds of DNS Queries questioning whether anyone has records for the service we wish to occupy and then after some time and nobody answered we announce the service?

https://www.rfc-editor.org/rfc/rfc6762#section-8

[willstott101]

Currently libmdns is only a responder and cannot perform queries. I'm still maintaining this lib but very much just to merge Pull Requests. Querying support would be very welcome (#5 ) but I'm personally unlikely to add anything substantial to this lib any time soon.

[willstott101]

Looking at this again:

The first startup step is that, for all those resource records that a
Multicast DNS responder desires to be unique on the local link, it
MUST send a Multicast DNS query asking for those resource records, to
see if any of them are already in use.

I think probing is only required when a service is expected to be unique. You're right that this would be a good thing to add. But again, really it's blocked on #5 being completed