Hi @Steph38230,
Tracking of connected devices (watches, phones, etc.) works very poorly over Bluetooth and Wi-Fi. This is largely intentional: manufacturers have implemented many techniques to prevent tracking of people (MAC address randomization, OS-level protections, etc.).
The goal is to make it much more difficult to identify and track a device over time, which is a good thing from a privacy standpoint.
That’s perfectly possible 
You create 2 scenes:
- « If user A enters zone X » → « Mark user A as home »
- « If user A leaves zone X » → « Mark user A as away »
For my part, for presence management, I set up 2 shortcuts on my phone:
My phone itself does the zone entry/exit detection, and then it makes a request to Gladys (via the Gladys Plus Open API: Open API | Gladys Assistant )
It works great and I think it’s the most battery-optimized way to do it, because the phone handles all the intelligence and so it’s optimized by Apple