[avahi] Dynamic Service subtypes

[Callum wilson]

Hi all,

I've been writing a small application which creates its own avahi stack.

I realise this isn't exactly standard, but I've been trying to dynamically add sub-types to a service depending on what other devices are looking for.

Currently, when I receive a request for a sub-type that I don't advertise, I reset the entry group, wait for the AVAHI_ENTRY_GROUP_UNCOMMITED event, re-add my main service and any existing and new subtypes, and then commit the group.

This works most ~75% of the time but eventually I get assert failures after successful registration of the group.

I've also tried deleting and recreating the entry group but I still get assert failures (although different asserts).

Am I missing some steps? I'm going through the daemon's code to see how this happens in there but I'm hoping someone will have the answer.

Thanks,
Callum