The Rickmote is a Python program for Hijacking Chromecasts and playing arbitrary video to their connected TVs. Full details on how the hack works were provided at the talk "Rickrolling your Neighbors ...

Useful, for example, if you have Sonos speakers on one interface, or VLAN, and you want to be able to control them from devices on a different interface/VLAN. Similar for Chromecast devices. By ...