How to detect the presence of a phone with known MAC address

[Gyula Kampfner]

I created a system some years ago that worked the way as the title suggests using classic bluetooth, and a cheap chinese module (HC-05) with custom firmware. Now I want to do the same with BLE, so my question is: how to check if a phone with a given MAC address is nearby, without advertising, installing any apps, etc. Is it possible?

[Stian Røed Hafskjold]

Hi, the phones are not advertising by themselves, just scanning. So you would need an app on the phone to advertise.