Home assistant auto discovery

when setting up the SSID in the adhoc wifi what do I put in topic to get home assistant auto discovery?

home/
or
homeassistant/

This. HA listens to homeassistant for auto-discovery messages.

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It says here that the topic prefix that HA listens to for auto discovery is configurable: MQTT - Home Assistant

Also, I believe that OMG is smart enough to always send auto discovery on the homeassistant/ topic, even if all other messages are sent on the topic prefix you choose in the config.