Bluetooth GATT Characteristic Reference

Scan Interval Window (0x2A4F)

org.bluetooth.characteristic.scan_interval_window

The Scan Interval Window characteristic is used to store the scan parameters of the GATT Client. The GATT Server can use these values to optimize its own advertisement rate and to minimize the rate of its own advertisements while also minimizing the latency of reconnections.

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	Scan Interval Window
UUID	0x2A4F
Type	org.bluetooth.characteristic.scan_interval_window
XML Root	Characteristic
Source File	org.bluetooth.characteristic.scan_interval_window.xml
Field Count	2

Field Specification

Parsed field definitions from the source XML value structure.

Field	Requirement	Format	Unit	Exponent	Notes
LE_Scan_Interval	Mandatory	uint16	-	-	-
LE_Scan_Window	Mandatory	uint16	-	-	-

Byte Layout and Decode

Payload length is 4 bytes.

function decodePayload(dataView, offset = 0) {
  const le_scan_interval = dataView.getUint16(offset + 0, true);
  const le_scan_window = dataView.getUint16(offset + 2, true);
  return { le_scan_interval, le_scan_window };
}

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 Scan Interval Window in Bluetooth GATT?

Scan Interval Window is defined as a Bluetooth GATT characteristic entry with type org.bluetooth.characteristic.scan_interval_window and UUID 0x2A4F.

What UUID identifies Scan Interval Window?

The UUID for Scan Interval Window is 0x2A4F.

How should I parse Scan Interval Window?