Bluetooth GATT Characteristic Reference
LN Feature (0x2A6A)
The LN Feature characteristic is used to report a list of features supported by the device.
Quick Summary
Payload length is 4 bytes. 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 | LN Feature |
| UUID | 0x2A6A |
| Type | org.bluetooth.characteristic.ln_feature |
| XML Root | Characteristic |
| Source File | org.bluetooth.characteristic.ln_feature.xml |
| Field Count | 1 |
Field Specification
Parsed field definitions from the source XML value structure.
| Field | Requirement | Format | Unit | Exponent | Notes |
|---|---|---|---|---|---|
| LN Feature | Mandatory | 32bit | - | - | - |
Bit Map
Bit-level enumerations extracted from the XML BitField definition.
| Field | Bit | Size | Name | 0 Means | 1 Means |
|---|---|---|---|---|---|
| LN Feature | 0 | 1 | Instantaneous Speed Supported | False | True |
| LN Feature | 1 | 1 | Total Distance Supported | False | True |
| LN Feature | 2 | 1 | Location Supported | False | True |
| LN Feature | 3 | 1 | Elevation Supported | False | True |
| LN Feature | 4 | 1 | Heading Supported | False | True |
| LN Feature | 5 | 1 | Rolling Time Supported | False | True |
| LN Feature | 6 | 1 | UTC Time Supported | False | True |
| LN Feature | 7 | 1 | Remaining Distance Supported | False | True |
| LN Feature | 8 | 1 | Remaining Vertical Distance Supported | False | True |
| LN Feature | 9 | 1 | Estimated Time of Arrival Supported | False | True |
| LN Feature | 10 | 1 | Number of Beacons in Solution Supported | False | True |
| LN Feature | 11 | 1 | Number of Beacons in View Supported | False | True |
| LN Feature | 12 | 1 | Time to First Fix Supported | False | True |
| LN Feature | 13 | 1 | Estimated Horizontal Position Error Supported | False | True |
| LN Feature | 14 | 1 | Estimated Vertical Position Error Supported | False | True |
| LN Feature | 15 | 1 | Horizontal Dilution of Precision Supported | False | True |
| LN Feature | 16 | 1 | Vertical Dilution of Precision Supported | False | True |
| LN Feature | 17 | 1 | Location and Speed Characteristic Content Masking Supported | False | True |
| LN Feature | 18 | 1 | Fix Rate Setting Supported | False | True |
| LN Feature | 19 | 1 | Elevation Setting Supported | False | True |
| LN Feature | 20 | 1 | Position Status Supported | False | True |
Byte Layout and Decode
Payload length is 4 bytes.
function decodePayload(dataView, offset = 0) {
// Parse ln_feature (32bit) according to Bluetooth format rules.
return { ln_feature };
}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 LN Feature in Bluetooth GATT?
LN Feature is defined as a Bluetooth GATT characteristic entry with type org.bluetooth.characteristic.ln_feature and UUID 0x2A6A.
What UUID identifies LN Feature?
The UUID for LN Feature is 0x2A6A.
How should I parse LN Feature?
Payload length is 4 bytes.
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.