When I leave home, I shut down all the electricity on my devices. On coming back, when I switch Roon Core on, I need to start the playlist or radio manually via the controller. Can we automate the process so that when Roon boots up, it starts an internet radio stream, for example, or any playlist? In this case, it will work as a stand-alone radio; start it, and it will play. If you need to change something, you will go to the controller later.
I maintain a Roon integration that connects HA to Roon and allows you to see the status of roon endpoints and send ‘play’ commands. Details here RoonLabs music player - Home Assistant
So if you had a ROCK you could do presence detection via the app to know someone arrived home, use WoL to turn the ROCK on, wait for it to start, and then send a play command.
Otherwise I think my HA integration will disable roon endpoints in HA when it sees your roon core has shut down, and enable then when it re-starts. So you can use the enabling of an endpoint as a trigger to start playing.
Hope that makes sense.
There is a long thread about HA and roon. It starts as it was being developed, but later posts describe how people are using it: Roon module for Home Assistant