47 lines
1.4 KiB
Markdown
47 lines
1.4 KiB
Markdown
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# Advertise UID
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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.advertiseUid(42, 1, 7, true);
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```
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## Parameters
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* ``namespace`` last 4 bytes of the namespace uid (6 to 9)
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* ``instance`` last 4 bytes of the instance (2 to 5)
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* ``power`` - a [number](/types/number) representing the power level between 0 (short) and 7 (maximum range).
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* ``connectable`` - a [boolean](/blocks/logic/boolean) indicating whether or not the @boardname@ should accept connections.
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## Encoding
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The bytes of ``namespace`` and ``instance`` are encoded to generate the 10 bytes UID namespace and 6 bytes UID instance.
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```
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UID namespace: [0, ..., namespace]
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UID instance: [0, ..., instance]
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```
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## See Also
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[stop-advertising](/reference/bluetooth/stop-advertising), [advertise-uid-buffer](/reference/bluetooth/advertise-uid-buffer)
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```package
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bluetooth
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```
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