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micro:bit Radio Relay

C++/CODAL firmware that turns a micro:bit V2 into a transparent USB-serial ↔ nRF radio bridge — no host library required, dual-mode (RAW250 / MakeCode), flash-persistent config.

• Overview — What the radio relay is, how it bridges serial to the nRF radio, and where to dig deeper.
• Protocol Reference — The complete relay protocol — command grammar, radio framing modes, the data-plane streaming layer, and the device announcement.
• Relay Server — Serve USB-attached relays over TCP, so a radio bridge is a socket away instead of a walk across the room.
• Using the Relay — Flash it, open the port, configure it, and push bytes over the radio — from bash, Python, or a serial terminal.

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🔒 Internal: Machine names, IPs, credentials → micro:bit relay server