Advertising packets are the messages that your Beacons transmit continuously announcing their presence to nearby devices.
- Kontakt.io Beacons start to send advertising packets as soon as the battery is installed.
- When you receive your Beacons, they will already be transmitting advertising packets.
- Advertising packets are compatible with Apple iBeacon™ standard.
- The advertising packets for the default Kontakt.io Beacon preset are transmitted every 350ms.
- On all beacons, except Beacon Pros, iBeacon packets are broadcasted as a connectable undirected advertising (ADV_IND). Beacons Pro broadcast them as non-connectable undirected advertising (ADV_NONCONN_IND).
iBeacon packet structure
After 9 bytes of constant preamble, the Proximity UUID, Major and Minor values are transmitted.
UUID is 16 bytes long, Major and Minor are 2 bytes long. Together they form an ID for your iBeacon. Mobile devices recognize which Beacon they approach on the basis of these values.
The final byte is the packet is used to calculate distance from the iBeacon. It represents RSSI value (Received Signal Strength Indication) measured at 1 meter from the iBeacon. The value of this byte changes automatically if the user changes the transmission power for the iBeacon.
| Byte offset | Default value | Description | Properties |
|---|---|---|---|
| 0 | 0x02 | Data length – 2 bytes | constant preamble |
| 1 | 0x01 | Data type – flags | constant preamble |
| 2 | 0x06 | LE and BR/EDR flag | constant preamble |
| 3 | 0x1a | Data length – 26 bytes | constant preamble |
| 4 | 0xff | Data type - manufacturer specific data | constant preamble |
| 5 | 0x4c | Manufacturer data | constant preamble |
| 6 | 0x00 | Manufacturer data | constant preamble |
| 7 | 0x02 | Manufacturer data | constant preamble |
| 8 | 0x15 | Manufacturer data | constant preamble |
| 9 | 0xf7 | Proximity UUID 1st byte | set user UUID |
| 10 | 0x82 | Proximity UUID 2nd byte | set user UUID |
| 11 | 0x6d | Proximity UUID 3rd byte | set user UUID |
| 12 | 0xa6 | Proximity UUID 4th byte | set user UUID |
| 13 | 0x4f | Proximity UUID 5th byte | set user UUID |
| 14 | 0xa2 | Proximity UUID 6th byte | set user UUID |
| 15 | 0x4e | Proximity UUID 7th byte | set user UUID |
| 16 | 0x98 | Proximity UUID 8th byte | set user UUID |
| 17 | 0x80 | Proximity UUID 9th byte | set user UUID |
| 18 | 0x24 | Proximity UUID 10th byte | set user UUID |
| 19 | 0xbc | Proximity UUID 11th byte | set user UUID |
| 20 | 0x5b | Proximity UUID 12th byte | set user UUID |
| 21 | 0x71 | Proximity UUID 13th byte | set user UUID |
| 22 | 0xe0 | Proximity UUID 14th byte | set user UUID |
| 23 | 0x89 | Proximity UUID 15th byte | set user UUID |
| 24 | 0x3e | Proximity UUID 16th byte | set user UUID |
| 25 | xx* | Major 1st byte | set major value |
| 26 | xx* | Major 2nd byte | set major value |
| 27 | xx* | Minor 1st byte | set minor value |
| 28 | xx* | Minor 2nd byte | set minor value |
| 29 | 0xb3 | Signal power (calibrated RSSI@1m) | signal power value |
* - by default Major and Minor values are generated randomly
Related information
- Advertising interval - best practises
- Scan response packet structure
- Transmission power settings
- Beacon services
- Apple iBeacon compatibility
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