title: Detect hidden/not visible bluetooth device on mobile
body: <p>I have the bluetooth mac-id of the target device. The bluetooth however is in hidden/not visible mode. </p>
  
  <p>Both phones are android. (Non-root). </p>
  
  <p>I did my research and I * know * that I can CONNECT to a device (in most cases) if I know the mac-id, however I want to just scan for proximity and NOT connect i.e. if the target device is in bluetooth range and I know its mac-id, can I  * just * know if its in proximity (or in loose terms, scan for it?)</p>