PSA: If you’re trying to use an ESP32 as a presence sensor in Home Assistant, and you’re using state_topic: espresense/rooms in your YAML, check that your ESP32 node is sending to the room topic. It is off by default.
I’m usually pretty good at reading documentation. And I generally avoid posting in forums. Which is why it took me three days of pain to finally find a post on Reddit by Kingharp pointing this out. Don’t be like BuzzMoo. Make sure that box is ticked.