It basically boils down to - you can reach it behind a NAT. I’m currently planning on installing a second small home-server at my parents place as a backup tar

It basically boils down to - you can reach it behind a NAT. I’m currently planning on installing a second small home-server at my parents place as a backup target. I thought about an easy, energy efficient way to turn it on and off. My current plan was using a raspberry pi but it would have been a bit overkill. So this is perfect. I already have a wireguard setup between my home server, laptop, smartphone and a cheap rented VM that acts a a router. I can just add the ESP to it know and use either the serial Interface of just a digital out connected to the power pin.