Bluetooth GATT Characteristic Reference

RSC Measurement (0x2A53)

org.bluetooth.characteristic.rsc_measurement

The RSC Measurement characteristic (RSC refers to Running Speed and Cadence) is a variable length structure containing a Flags field, an Instantaneous Speed field and an Instantaneous Cadence field and, based on the contents of the Flags field, may contain a Stride Length field and a Total Distance field.

Quick Summary

Payload length is 10 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	RSC Measurement
UUID	0x2A53
Type	org.bluetooth.characteristic.rsc_measurement
XML Root	Characteristic
Source File	org.bluetooth.characteristic.rsc_measurement.xml
Field Count	5

Field Specification

Parsed field definitions from the source XML value structure.

Field	Requirement	Format	Unit	Exponent	Notes
Flags	Mandatory	8bit	-	-	These flags define which data fields are present in the Characteristic value.
Instantaneous Speed	Mandatory	uint16	org.bluetooth.unit.velocity.metres_per_second	-	Unit is in m/s with a resolution of 1/256 s
Instantaneous Cadence	Mandatory	uint8	org.bluetooth.unit.angular_velocity.revolution_per_minute	-	Unit is in 1/minute (or RPM) with a resolutions of 1 1/min (or 1 RPM)
Instantaneous Stride Length	C1	uint16	org.bluetooth.unit.length.meter	-	-
Total Distance	C2	uint32	org.bluetooth.unit.length.meter	-	-

Bit Map

Bit-level enumerations extracted from the XML BitField definition.

Field	Bit	Size	Name	0 Means	1 Means
Flags	0	1	Instantaneous Stride Length Present	False	True
Flags	1	1	Total Distance Present	False	True
Flags	2	1	Walking or Running Status bits	Walking	Running

Byte Layout and Decode

Payload length is 10 bytes.

function decodePayload(dataView, offset = 0) {
  // Parse flags (8bit) according to Bluetooth format rules.
  const instantaneous_speed = dataView.getUint16(offset + 0, true);
  const instantaneous_cadence = dataView.getUint8(offset + 2);
  const instantaneous_stride_length = dataView.getUint16(offset + 3, true);
  const total_distance = dataView.getUint32(offset + 5, true);
  return { flags, instantaneous_speed, instantaneous_cadence, instantaneous_stride_length, total_distance };
}

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 RSC Measurement in Bluetooth GATT?

RSC Measurement is defined as a Bluetooth GATT characteristic entry with type org.bluetooth.characteristic.rsc_measurement and UUID 0x2A53.

What UUID identifies RSC Measurement?

The UUID for RSC Measurement is 0x2A53.

How should I parse RSC Measurement?