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MAC address would be great , but doesn't it randomly change from time to time ? If not then I can definitely use the MAC address. I will be using ESPHome with a Bluetooth esp as a base station device that sends the presence back to Home assistant .
https://esphome.io/components/binary_sensor/ble_presence.html
You can see MAC address as one of the 3 options
greylinux
well, you can also distinguish by device mac address or even advertised device name out of box, no code needed for that on puck