Could be interesting...
Apparently these devices can work with ultrasounds which people cannot hear -- see
https://www.theverge.com/2017/9/7/16265906/ultrasound-hack-siri-alexa-google
So, leave a cheap phone plugged in "charging" which periodically requests the room thermostat to set to 35 degrees C, then a bit later to switch to 12 degrees, have it also turn lights on and off, TV volume up and down.... It may spook any room service staff in the room at the time but could certainly inconvenience the hotel management - and is easily deniable.
Biting the hand that feeds IT
