Note: Major API Changes. For older projects, you may use the v0.9 branch. Please see Migration notes

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. A minimal configuration for an SPP server on a MSP430 can run in 32 kB FLASH and only 4 kB of RAM.

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 daemon that connects to a Bluetooth module. Multiple applications can communicate with this daemon over different inter-process communication methods.

BTstack supports the Central and the Peripheral Role of Bluetooth 4.2 Low Energy specification. 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, tell us a bit about your project to get a quote.

Documentation: HTML, PDF

Discussion and Community Support: BTstack Google Group

Protocols: L2CAP, RFCOMM, SDP, BNEP, ATT, SM (incl. LE Secure Connections).

Profiles GAP, IOP, HFP, HSP, SPP, PAN, GATT.

Coming next A2DP, AVRCP, HID, HOGP, BLE Mesh, and more.

It has been qualified with the the Bluetooth SIG for GAP, IOP, HFP, HSP, SPP, PAN profiles and GATT, SM of the Bluetooth 4.2 LE Central and Peripheral roles (QD ID 25340). For information on MFi/iAP2 support, please contact us.

Status	Platform
	EZ430-RF256x Bluetooth Evaluation Tool for MSP430
	MSP430F5438 Experimenter Board for MSP430 with Bluetooth CC2564 Module Evaluation Board
	MSP-EXP430F5529LP LaunchPad with Bluetooth CC2564 Module Evaluation Board and EM Adapter BoosterPack with additional 32768Hz quartz oscillator
	STM32 Nucleo development board NUCLEO-F103RB with Bluetooth CC2564 Module Evaluation Board and EM Adapter BoosterPack with additional 32768Hz quartz oscillator
	Microchip's PIC32 Bluetooth Audio Development Kit
	RedBear Duo with Broadcom BCM43438 A1

Status	Platform
	posix-h4: Unix-based system talking to Bluetooth module via serial port
No build server	posix-h4-da14581: Unix-based system connected to Dialog Semiconductor DA14581 via H4 over serial port
No build server	posix-h5: Unix-based system connected to Bluetooth module via H5 over serial port
	libusb: Unix-based system talking via USB Bluetooth dongle
No build server	windows-h4: Win32-based system connected to Bluetooth module via serial port
No build server	windows-winusb: Win32-based system with dedicated USB Bluetooth dongle
	daemon: TCP and Unix domain named socket client-server architecture supporting multiple clients
	java: Java wrapper for daemon
	iOS: daemon for iOS jailbreak devices, C client-server API
	mtk: daemon for rooted Android devices, based on Mediatek MT65xx processor, Java and C client-server API
	wiced: Broadcom platforms that support the WICED SDK

More infos on supported chipsets