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Welcome to BTstack

BTstack is BlueKitchen's implementation of the official Bluetooth stack. It is well suited for small, resource-constraint devices such as 8 or 16 bit embedded systems as it is highly configurable and comes with an ultra small memory footprint.

Targeting a variety of platforms is as simple as providing the necessary UART, CPU, and CLOCK implementations. BTstack is currently capable of connecting to Bluetooth-modules via: (H2) HCI USB, (H4) HCI UART + TI's eHCILL, and (H5) HCI Three-Wire UART.

On smaller embedded systems, a minimal run loop implementation allows to use BTstack without a Real Time OS (RTOS). If a RTOS is already provided, BTstack can be integrated and run as a single thread.

On larger systems, BTstack provides a server that connects to a Bluetooth module. Multiple applications can communicate with this server over different inter-process communication methods. As sockets are used for client/server communication, it's easy to interact via higher-level level languages, e.g. there's already a Java binding for use in desktop environments.

BTstack supports the Central and the Peripheral Role of Bluetooth 5 Low Energy specification incl. LE Secure Connections, LE Data Channels, and LE Data Length Extension. It can be configured to run as either single-mode stack or a dual-mode stack.

BTstack is free for non-commercial use. However, for commercial use, <a href="mailto:contact@bluekitchen-gmbh.com">tell us</a> a bit about your project to get a quote.

Documentation: HTML, PDF

Third-party libraries (FOSS): List of used libraries and their licenses

Discussion and Community Support: BTstack Google Group

Supported Protocols and Profiles

Protocols: 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).

Profiles: A2DP, AVRCP incl. Browsing (CT+TG) and Cover Art (CT), GAP, GATT, HFP, HID, HSP, IOP, OPP, SPP, PAN, PBAP.

GATT Service Servers: Battery (BAS), Bond Management (BMS), Cycling Power (CPS), Cycling Speed and Cadence (CSCS), Device Information (DID), Heart Rate (HRS), HID over GATT (HIDS) Device , Mesh Provisioning, Mesh Proxy, Nordic SPP, Scan Parameters (SCPS), TX Power (TPS), u-Blox SPP.

GATT Service Clients:: ANCS, Battery (BAS), Device Information (DID), HID-over-GATT (HOGP) Host, Scan Parameters (SCPP).

GATT Services are in general easy to implement and require short development time. For more GATT Services please contact us, or follow the implementation guidelines.

In Development: LE Audio and more.

It has been qualified with the Bluetooth SIG (QDID 166433) for A2DP 1.3.2, AVCTP 1.4, AVDTP 1.3, AVRCP 1.6.2, DID 1.3, GAVDP 1.3, HFP 1.8, HSP 1.2, PAN 1.0, PBAP Client 1.2, RFCOMM 1.2, SPP 1.2 BR/EDR protocol/profiles, BAS 1.0, CPP 1.1, CPS 1.1, CSCP 1.0, CSCS 1.0, DIS 1.1, HIDS 1.0, HOGP 1.0, HRP 1.0, HRS 1.0, SCPP 1.0, SCPS 1.0 GATT profiles as well as and ATT, GAP, GATT, IOP, L2CAP, SDP, SM of the Bluetooth Core 5.2 specification.

For information on Apple's MFi/iAP2 and Find My profiles, please <a href="mailto:contact@bluekitchen-gmbh.com">contact us directly</a>.

Evaluation Platforms

Embedded Platforms:

Other Platforms:

Supported Chipsets

More infos on supported chipsets

Source Tree Overview