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

How to detect the presence of a phone with known MAC addresshttps://devzone.nordicsemi.com/f/nordic-q-a/35607/how-to-detect-the-presence-of-a-phone-with-known-mac-addressI 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 MACen-USTelligent Community 13Thu, 21 Jun 2018 11:14:04 GMTRE: How to detect the presence of a phone with known MAC addresshttps://devzone.nordicsemi.com/thread/137064?ContentTypeID=1Thu, 21 Jun 2018 11:14:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:132a8b22-f6ab-439d-815d-706361d38fd5Stian Røed Hafskjold<p>Hi, the phones are not advertising by themselves, just scanning. So you would need an app on the phone to advertise.</p><div style="clear:both;"></div>