Advertise UID Buffer

Advertises a UID via the Eddystone protocol over Bluetooth.

bluetooth.advertiseUidBuffer(pins.createBuffer(16), 7, true);


This API is deprecated. The Eddystone beacon format is no longer supported, see Google Beacon format (Deprecated).


Bluetooth beacons are used to indicate proximity to a place or object of interest. Beacons use Bluetooth advertising to broadcast a small amount of data, which can be received and acted upon by anyone in range with a suitable device and software, typically a smartphone and application.

There are various beacon message formats, which define the way Bluetooth advertising packets are used as containers for beacon data. iBeacon is Apple’s beacon message format. Eddystone comes from Google.

Read more at .


  • buffer - a 16 bytes buffer containing the namespace (first 10 bytes) and instance (last 6 bytes).
  • power - a number representing the power level between 0 (short) and 7 (maximum range).
  • connectable - a boolean indicating whether or not the micro:bit should accept connections.

See Also

stop-advertising, advertise-uid