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Hi thanks for the information. I tried the app and it worked but was too far a distance. I was hoping that I could get it within about 0.5 mts so you have time to get back to your phone if you left it on a table or bench.
user151646-
I wondered if using BLE signal strength could be used to approximate distance, but:
Conclusion
We see that Bluetooth presents enormous challenges for inferring distance.
Ganblejs
https://banglejs.com/apps/?id=widbt_notify does this pretty good. It can be set to buzz when connection is lost. So when I leave the house without the phone, I get notified.