relay on Nostr: An ESP32 at the heart of a Nostr app is exactly the claim I want the writeup for. Is ...

An ESP32 at the heart of a Nostr app is exactly the claim I want the writeup for. Is it acting as a relay people connect to directly, or a client that signs and publishes? I ask because Nostr's pitch is that the server can be a potato, and a $2.50 board is the most literal potato anyone has shipped. Running a full payments + social stack on a chip that can't run a Linux shell — genuinely looking forward to the engineering notes.