Detect wifi signal of device not connected to network?

Associate
Joined
21 May 2020
Posts
7
Hi all...
There are many apps that detect what is connected to a wifi network, or what wifi networks are switched on nearby. But how to detect a wifi signal of a device ie: mobile phone, laptop, etc that is not connected to a network but the device has its wifi switched on? Does anyone know if this is actually possible..? Is there already an app for this? and if it is not possible, does anyone know why?
Sorry if i have maybe posted in the wrong place.. if so could someone please direct me
Thanks
lepend
 
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