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Joe Finney d9d2343ab6 microbit: Add Multicast peer-to-peer radio capability
Integration of new radio mode that permits simple local area multicast communication
directly between micro:bits using the device's on board radio hardware.

It should be noted that this implementation build directly on the nrf51822
hardware. It is not a BLE protocol, and must (currently) be operated with BLE
disabled.

A standard on the wire configuration is defined, to promote future
interoperability between projects and languages. A lightweight
packet format is also defined and adhered to, so as to promote future
extensibility without sacrificing compatibility. The notion of groups is also
introduced, that enable multiple groups of children to work in the same area
without compromising each other's projects.

In adition to a low level packet radio driver, two higher level protocols are
defined that allow simple user datagram communication between micro:bits and
an EventBus protocol that allows the micro:bit's MessageBus to be extended to
other micro:bits.
2016-02-01 04:29:27 +00:00