Bluetooth GATT Characteristic Reference
Alert Status (0x2A3F)
The Alert Status characteristic defines the Status of alert.
Quick Summary
Payload length is 1 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 | Alert Status |
| UUID | 0x2A3F |
| Type | org.bluetooth.characteristic.alert_status |
| XML Root | Characteristic |
| Source File | org.bluetooth.characteristic.alert_status.xml |
| Field Count | 1 |
Field Specification
Parsed field definitions from the source XML value structure.
| Field | Requirement | Format | Unit | Exponent | Notes |
|---|---|---|---|---|---|
| Alert Status | Mandatory | uint8 | - | - | - |
Bit Map
Bit-level enumerations extracted from the XML BitField definition.
| Field | Bit | Size | Name | 0 Means | 1 Means |
|---|---|---|---|---|---|
| Alert Status | 0 | 1 | Ringer State | Ringer State not active | Ringer State active |
| Alert Status | 1 | 1 | Vibrate State | Vibrate State not active | Vibrate State active |
| Alert Status | 2 | 1 | Display Alert Status | Display Alert Status not active | Display Alert Status State active |
Byte Layout and Decode
Payload length is 1 bytes.
function decodePayload(dataView, offset = 0) {
const alert_status = dataView.getUint8(offset + 0);
return { alert_status };
}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 Alert Status in Bluetooth GATT?
Alert Status is defined as a Bluetooth GATT characteristic entry with type org.bluetooth.characteristic.alert_status and UUID 0x2A3F.
What UUID identifies Alert Status?
The UUID for Alert Status is 0x2A3F.
How should I parse Alert Status?
Payload length is 1 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.