BBC micro:bit Bluetooth security

The BBC micro:bit uses standard Bluetooth security. It requires devices such as smartphones to have paired with it before the majority of interactions are permitted. Pairing uses "passkey authentication" which means that during the pairing process, the micro:bit will display a 6 digit random number which has to be keyed into the smartphone. Having paired, all Bluetooth characteristics become available for access, Characteristics support some combination of read, write and notify and in the greater majority of cases, the security rules stipulate that these must take place over a secure (i.e. encrypted) link. An attempt to perform such an operation without having paired should cause the smartphone OS to initiate the pairing process automatically.

I've created a video showing how to pair with your micro:bit:

http://bluetooth-mdw.blogspot.co.uk/p/bbc-microbit.html#pairing