I have been using this BLE method (python script) with Domoticz and a couple of raspberry pi zero W. https://www.domoticz.com/wiki/Presence_detection_(Bluetooth_4.0_Low_energy_Beacon) One pi is near my driveway, and one on the other side of the house. I have an old Tile tag in one car and a Nut in the other. Both work fine for detecting when my cars leave and return. It also detects my Fitbit, an old one of the original type. I have that with me most of the time, so it acts like a tag for my presence. I haven't done much with it so far except to turn on the porch light when the cars pull into the driveway at night.