Reply to post: switch off your Wi-Fi...

TfL to track Tube users in stations by their MAC addresses

Neil Barnes Silver badge

switch off your Wi-Fi...

Can someone a bit more au-fait with the technology than I am point me to a primer for the handshake/negotiation that takes place between a device with wifi turned on but only connecting to known hotspots - i.e. not the open spot on the underground?

Does the connection request start from a device which notices a live network or does the network poll? Or...?

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