I have a tractor. Mice like to chew electrical wiring because the wire casings are made of soybeans, so the tractor dealer recommended setting several traps by my tractor. I couldn't stand killing a mouse so I used "humane" catch and release traps, the problem was a mouse died because I forgot to check the trap. So I put a reed switch and an esp-32 on a catch and release mouse trap that when tripped, sent an mqtt message to aws iot, that triggered a lambda function that sent me an email notifying me I had a mouse to let out of its trap.