Berlin, June 30^th, 2025

We are thrilled to announce the release of Blue SDK 7.4, now supporting Bluetooth® Channel Sounding, with its power efficiency, enhanced security and higher accuracy relative to legacy systems based on Received Signal Strength Indicator (RSSI), providing the ability to seamlessly upgrade existing solutions.

The Bluetooth® standard continuously evolves from the original concept as a simple wire replacement to adding more sophisticated security and distance sensing technology. 

Bluetooth Channel Sounding, included in the Bluetooth 6.0 Core Specification, is a significant evolution of the new LE 2M and Coded PHYs, paving the way to a new class of autonomous, location-aware systems for increased awareness of the environment for more secure applications.

Up to now, Bluetooth LE systems used RSSI for localization with limited accuracy and known security vulnerabilities. Bluetooth Channel Sounding uses phase-based ranging (PBR) for accuracy combined with round trip time (RTT) for end-to-end security, so compatible devices can consistently determine distance with enhanced accuracy and security. As an example, using Bluetooth to unlock your car or home can be managed much more securely as communication between the devices can determine their distance with a very high accuracy, so that applications are smarter and more secure enabling a much better user experience.

Bluetooth LE Audio, Ready for Auracast & Channel Sounding 

• CHANNEL SOUNDING – Host stack features to support Channel Sounding
• MULTI-STREAM AUDIO – Multiple, Independent, Synchronized Audio Streams
• BROADCAST AUDIO – Broadcast Audio Streams to Unlimited Devices
• LE AUDIO PROFILES – AICS, ASCS, BAP, BASS, CAP, CCP, CSIP, CSIS, MCP, (G)MCS, MICP, MICS, OTP, OTS, PACS, PBP, (G)TBS, TMAP, VCP, VCS, VOCS, LC3 Codec
• AUDIO QUALITY – Better Audio & Voice Quality at Half the Bitrate

Single-Mode LE Configuration

• Configurable and optimized to support Low Energy-only functionality (Single-Mode)
• Improves upon existing Single-Mode LE configurations by removing unneeded Classic components to better support resource-constrained systems

Key components

• RFCOMM, L2CAP, SDP, GAP (SCO Manager, Connection Manager, Device Manager, Security Manager), HCI, Device ID Profile

All the latest Bluetooth Profiles

• A2DP 1.4, MAP 1.4.2, AVRCP 1.6.3, PBAP 1.2.3, HFP 1.9, SPP 1.2

OpenSynergy specializes in embedded software and has been at the forefront of Bluetooth development for more than 25 years. Blue SDK is the Bluetooth industry-leading solution for Automotive integrated by OEMs and Tier1s in more than 350 million cars worldwide. and broadly adopted in Medical, Industrial, Mobile, and Consumer applications, now deployed in over 1 billion embedded devices. Available on all the main operating systems (Windows™, Linux, Android™, QNX®) and compatible with hundreds of radios produced by Qualcomm, NXP, Infineon, Texas Instruments, ST Micro, and many others, Blue SDK is designed to reduce engineering risk, total project cost, and on-going ownership effort.