What would be the best way to have a RELIABLE way to know if the shower is on or off? Door sensor is not reliable since it is subject to be open or closed more than once during a single shower, or you could be washing it and not actually take one. Furthermore, a moist sensor wouldn’t work well since the shower stays wet for a while after shower. What I’m looking for a is really when water is ON or OFF at all to start / stop sonos.
Your ideas are welcomed!