2016-12-23 17:58:38 +01:00
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# Avertise UID Buffer
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Advertises a UID via the Eddystone protocol over Bluetooth.
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## ~hint
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### Eddystone
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Bluetooth beacons are used to indicate proximity to a place or object of interest.
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Beacons use Bluetooth advertising to broadcast a small amount of data,
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which can be received and acted upon by anyone in range with a suitable device and software, typically a smartphone and application.
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There are various beacon message formats, which define the way Bluetooth advertising packets are used as containers for beacon data.
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iBeacon is Apple's beacon message format. Eddystone comes from Google.
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Read more at https://lancaster-university.github.io/microbit-docs/ble/eddystone/ .
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## ~
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```sig
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bluetooth.advertiseUidBuffer(pins.createBuffer(16), 7, true);
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```
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### Parameters
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* ``buffer`` - a 16 bytes buffer containing the namespace (first 10 bytes) and instance (last 6 bytes).
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* ``power`` - a [number](/reference/types/number) representing the power level between 0 (short) and 7 (maximum range).
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2017-01-06 15:12:39 +01:00
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* ``connectable`` - a [boolean](/blocks/logic/boolean) indicating whether or not the micro:bit should accept connections.
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2016-12-23 17:58:38 +01:00
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## See Also
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[stop-advertising](/reference/bluetooth/stop-advertising), [advertise-uid](/reference/bluetooth/advertise-uid)
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```package
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bluetooth
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```
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