Google Chromecast is working?

Google Chromecast is working with R2 ??
I use the Integrationen with Android TV and they found the ip from Chromecast but after
have error Hoppla! Timeout

Did you watch what is displayed on your TV when you tried it? Normal Android TV needs pairing and for that an code is displayed and must be entered.

Does anyone have Chromecast running on the R2?
and if so, how??

on apple.tv I see the code on the TV, but not on Chromecast.

Now it works with new R2 firmware 1.8.0

Which is still in beta, just a note.