Broadcast for playBytes or tts/say?

Hi everybody,

if I have a text to be spoken or a sound to be played I add a siteId to the message or topic.

Now if I have something I want to be played on all sites is there some kind of broadcast address?

Alternatively is there a way to query configuration information from Rhasspy? That way I could get all satellite names first and send the message to them one after another.