BTstack supports both single-mode (BD/EDR or LE), as well as dual-mode (BD/EDR+LE) Bluetooth controllers.

The run loop abstraction allows to either run BTstack on bare metal, or, integrate with an RTOS.

Implements all Bluetooth SIG recommendations. It is fuzzed and automatically tested. Not affected by BlueBorne and SweynTooth.

L2CAP (incl. Enhanced Retransmission Mode and LE Data Channels), RFCOMM, SDP, BNEP, AVDTP, AVCTP, ATT, SM (incl. LE Secure Connections and Cross-transport key derivation).

Compile-time directives allow to optimize memory consumption by selectively enabling required functionality.

UART-based chipsets require only a thin adapter for the platform UART driver and a system tick. Check supported chipsets.

Industries: Secure appliances, Automotive accessories, Navigation, Fitness, Medical devices, Logistics, and more.

A2DP, AVRCP incl. Browsing, GAVDP, GAP, GATT, HFP, HID, HSP, HRP, IOP, MAP, SPP, PAN, PBAP, DID, BAU, MFi iAP2, LE Audio (OTP, VCP, MICP, MCP, CCP, CSIP, BAP, CAP, HAP, TMAP, PBP, GMAP)

ANSI-C source code is available to all customers, and it's free for non-commercial use.

A configurable packet logging mechanism enables detailed and effective offsite problem analysis saving time and money.

BTstack has been qualified for Bluetooth Core v6.0 in December 2024, DN Q331293.

Battery, Cycling Power, Cycling Speed and Cadence, Device Information, Heart Rate, Immediate Alert, Link Loss, Scan Parameters, HID over GATT (HOG), Mesh Provisioning, Mesh Proxy, Nordic SPP, u-Blox SPP, LE Audio (OTS, LC3, AICS, VOCS, VCS, MICS, MCS, GMCS, TBS, CSIS, PACS, ASCS, BASS, CAS, HAS) For more GATT Services please contact us, or follow the implementation guidelines.

Using a single run loop, it doesn't require multi-threading, doesn't block nor queue data.

While you can develop and test your Bluetooth application on desktop, it will run on different embedded target devices without changes.

You can start evaluating BTstack right now, the source code is available on btstack.org.