I want to get a list of all the devices(who has their wifi turned on) which are within Wifi hotspot range. However it may or may not be connected to the hotspot. I am getting the list of connected devices by using this library but I am not sure whether it is possible to get the devices which are not connected to wifi hotspot and are just within its range. It would be really nice if someone could clarify on the possibility of it.Thanks.
Hotspot 2.0 does not rely on a MAC address for authentication, rather it is a certificate based approach to identifying and automatically authenticating a device onto a network.
No it's not possible, the only way to see not-connected devices is to go on the administration panel of the box (and you will only see previously connected devices). So you will not be able to see them if you're not admin on the box.
Moreover, I suggest you to take a look at nmap tool to discover all the clients of a network. You also have Fing on Android which is a pretty good tool.
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