In the intended context, it is an unreliable and useless technique, as the
magnetic signature depends on the relative orientation of the two devices, and
every other bit of metal that is around. To make any sense at all out of the
inevitable noise, you need a lot of processing power, constantly, which impairs
battery life. Bluetooth itself is problematic enough, when people insist on
leaving it on. Every time I drive through London, at least once the car radio is
interrupted and announces something like "please enter the PIN code displayed on
the radio into your phone", because some idiot has left their bluetooth on and
it is looking for something to pair with. Discovering devices by other methods
is only going to add to the problem. What is wrong with plugging in a micro
USB OTG lead? It only happens when you know that you want to comminicate between
the two devices, so it is much more secure, and also very much faster. Pandering
to people's laziness by introducing worthless new gimmicks which cause
additional problems is not a good idea. [ Reply to This | Parent | # ]
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