We have a need for a large customer to sniff-out people with Wifi-enabled phones (but not logged-in/authenticated) mostly to know if there are humans in the area (safety/security reasons). We can't use ALE although that does seem like it would be great. I believe there is some REST API directly into the AP's, but I'm unsure if there is a way to find out what MACs are beaconing etc... Any help would be appreciated!