Bluetooth GATT Characteristic Reference
Alert Notification Control Point (0x2A44)
The 1st octet value of the characteristic is an unsigned 8 bit integer that has a fixed point exponent of 0. The 1st octet value expresses the command ID that defines the server?s actions.
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 | Alert Notification Control Point |
| UUID | 0x2A44 |
| Type | org.bluetooth.characteristic.alert_notification_control_point |
| XML Root | Characteristic |
| Source File | org.bluetooth.characteristic.alert_notification_control_point.xml |
| Field Count | 2 |
Field Specification
Parsed field definitions from the source XML value structure.
| Field | Requirement | Format | Unit | Exponent | Notes |
|---|---|---|---|---|---|
| Command ID | Mandatory | uint8 | - | - | - |
| Category ID | Mandatory | N/A | - | - | Target category that the command applies to. |
Byte Layout and Decode
Payload length is profile-defined or variable based on field formats.
function decodePayload(dataView, offset = 0) {
const command_id = dataView.getUint8(offset + 0);
// Parse category_id (N/A) according to Bluetooth format rules.
return { command_id, category_id };
}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 Notification Control Point in Bluetooth GATT?
Alert Notification Control Point is defined as a Bluetooth GATT characteristic entry with type org.bluetooth.characteristic.alert_notification_control_point and UUID 0x2A44.
What UUID identifies Alert Notification Control Point?
The UUID for Alert Notification Control Point is 0x2A44.
How should I parse Alert Notification Control Point?
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.