[Microbit-Python] micro:badge

[Daniel Hill]

Oops! Back before we were using pxt I thought i was able to try it. It uses
just the radio now.

The first thing I'm discussing with badge holders is a mesh network
protocol. As this is for DEFCON, the security challenges here are at the
forefront. Can we avoid replay attacks? Add privacy? How about
authentication? All in the tight little microcontroller memory size.

I think I'll stick with adding mundane stuff until the con. Was thinking of
a new feature where you would hold it face down in the air and it would
tell you how many pairings are in range with a ping-like challenge/response.
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