XT1520-1 Product Manual
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CONFIDENTIAL AND PROPRIETARY
4. B
LUETOOTH
(BLE)
The XT1520-1 uses Bluetooth 5 network, utilizing the Eddystone
(TM)
message protocol from Google. This
protocol has four frame types: UID, URL, TLM, and EID; however, URL and EID frames are not utilized in this
application. In depth information on Eddystone
(TM)
can be found here:
https://developers.google.com/beacons/eddystone
4.1. UID F
RAME
This frame type is very important in the XT15 as it comprises the primary functionality of the device. The UID is a
unique 16-byte ID with a 10-byte namespace and 6-byte instance ID. The namespace portion is used to group
sets of XT15s and the instance ID is used to identify individual devices.
UID Frame
Frame Type
Power at 1 M
Namespace ID
Instance ID
RFU
1 byte
1 byte
10 bytes
6 bytes
2 bytes
4.2. TLM F
RAME
The TLM frame type is used to display telemetry data about the operations of the clients in use. It can be used to
monitor beacons in the field. The frame is paired with an identifier frame because TLM has no beacon ID. This
frame broadcasts at a 1/10 Hz frequency.
TLM Frame
Frame Type
Version
Battery
Voltage (mV)
Beacon
Temperature
ADV PDU Count
Since Boot
Time Since Boot
(100ms incraments
1 byte
1 byte
2 bytes
2 bytes
4 bytes
4 bytes
