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One thing I've wanted to do is put a battery charge monitor on the escooter I leave at work. I'd like it to report the charge back to a computer I have at my house. Running WireGuard on an ESP would let me send battery telemetry back to machine I control, even if the scooter was on public wifi, and without having expose any of my ports to the wider internet (except 51820).

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> except 51820

Even then, it's technically open but it's using UDP so it's not like it'll show up in port scans or anything.

UDP port scans are a thing:

https://nmap.org/book/scan-methods-udp-scan.html

Wireguard protocol is specifically designed not to show up on port scans. See section 5.1 of the white paper: https://www.wireguard.com/papers/wireguard.pdf

Very cool - I didn't know that!

But, speaking generally, it's still good to know that UDP port scans are very much possible.

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