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RADIO Resource Policy

nRF52840 has one 2.4 GHz RADIO. ArduinoNRF must make ownership explicit instead of silently allowing incompatible stacks to fight each other.

Runtime ownership matrix

Stack/path Uses nRF52840 RADIO Runs inside Arduino sketch Coexists with Arduino NimBLE
Arduino NimBLE Yes Yes N/A
NiusThread own-radio path Yes Yes No
nCS Zigbee R23 sidecar Yes No, replaces sketch No
Future in-sketch ZBOSS Yes Experimental future No unless official MPSL path exists
External CC2530 No Yes Yes

Current rule

  • One onboard-radio stack at a time in the Arduino bare-metal runtime.
  • External CC2530 is independent because it uses UART and its own radio.
  • Official Zigbee R23 is implemented first as a sidecar firmware, not as a library linked into normal Arduino sketches.
  • Multiprotocol work belongs in the nCS/MPSL path first.

Debugging note

USB CDC and the USB GDB stub do not directly conflict with the RADIO, but halting a CPU that is running a live wireless stack can break timing. Sidecar Zigbee validation should prefer SWD/J-Link for early bring-up.