Bluetooth GATT Characteristic Reference
Reference Time Information (0x2A14)
Reference Time Information is defined in the Bluetooth GATT XML specification with type org.bluetooth.characteristic.reference_time_information and UUID 0x2A14.
Quick Summary
Payload length is profile-defined or variable based on field formats. This page is generated from official GATT XML and presented as implementation-ready guidance.
At a Glance
Key reference details for BLE implementation, interoperability testing, and AI-assisted troubleshooting.
| Property | Value |
|---|---|
| Name | Reference Time Information |
| UUID | 0x2A14 |
| Type | org.bluetooth.characteristic.reference_time_information |
| XML Root | Characteristic |
| Source File | org.bluetooth.characteristic.reference_time_information.xml |
| Field Count | 4 |
Field Specification
Parsed field definitions from the source XML value structure.
| Field | Requirement | Format | Unit | Exponent | Notes |
|---|---|---|---|---|---|
| Source | Mandatory | N/A | - | - | - |
| Accuracy | Mandatory | N/A | - | - | - |
| Days Since Update | Mandatory | uint8 | org.bluetooth.unit.time.day | - | - |
| Hours Since Update | Mandatory | uint8 | org.bluetooth.unit.time.hour | - | If Days Since Update = 255, then Hours Since Update shall also be set to 255 |
Byte Layout and Decode
Payload length is profile-defined or variable based on field formats.
function decodePayload(dataView, offset = 0) {
// Parse source (N/A) according to Bluetooth format rules.
// Parse accuracy (N/A) according to Bluetooth format rules.
const days_since_update = dataView.getUint8(offset + 0);
const hours_since_update = dataView.getUint8(offset + 1);
return { source, accuracy, days_since_update, hours_since_update };
}Use Cases and Integration Notes
BLE Telemetry
Map characteristic values into dashboards and alerts for device observability.
Firmware Regression
Compare decoded fields across builds to detect protocol or scaling changes.
App Integration
Build stable parsing paths that convert raw payloads into typed app models.
Implementation Checklist
- Validate payload length and mandatory fields before decode.
- Decode with Bluetooth-specified signedness, unit, and exponent handling.
- Convert units at presentation boundaries to avoid drift in business logic.
- Persist raw packets and decoded values for reproducible troubleshooting.
FAQ
What is Reference Time Information in Bluetooth GATT?
Reference Time Information is defined as a Bluetooth GATT characteristic entry with type org.bluetooth.characteristic.reference_time_information and UUID 0x2A14.
What UUID identifies Reference Time Information?
The UUID for Reference Time Information is 0x2A14.
How should I parse Reference Time Information?
Payload length is profile-defined or variable based on field formats.
Where does this definition come from?
This page is generated from the Bluetooth SIG mirror XML in the oesmith/gatt-xml repository.
How does this page support BLE implementation?
The page combines structured tables, practical Q&A, and JSON-LD metadata to help teams validate integrations and troubleshoot consistently.