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Dual-mode Bluetooth stack, with small memory footprint.

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

It connects to the Bluetooth modules via different Bluetooth HCI transport layers (e.g., HCI H4 UART and H5 the "Tree-Wire" protocol). The various platforms can be easily targeted by providing the necessary UART, CPU, and CLOCK implementations.

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 both, the Central and the Peripheral Role of Bluetooth 4.0 Low Energy specification. It can be configures as both a single mode or a dual mode stack.

BTstack is free for non-commercial use. For commercial use, tell us a bit about your project to get a quote. The Serial Port Profile (SPP) and the Bluetooth 4.0 Low Energy Peripheral role (LE Peripheral) have been qualified with the Bluetooth SIG (QD ID 54558). This summer, we plan to qualify for Bluetooth Core 4.2, together with LE Central, PAN/BNEP and HSP.

Documentation

For starters, check the BTstack Manual

Supported Protocols

  • L2CAP
  • RFCOMM
  • SDP
  • BNEP
  • ATT
  • SM

Supported Profiles

  • GAP
  • IOP
  • SPP
  • PAN
  • GATT

Coming soon: HSP, HFP, and more.

Evaluation Platforms

Embedded Platforms:

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

Other Platforms:

Status Platform
buildstatus posix: Unix-based system talking to Bluetooth module via serial port
buildstatus libusb: Unix-based system talking via USB Bluetooth dongle
buildstatus daemon: TCP and Unix domain named socket client-server architecture supporting multiple clients
buildstatus java: Java wrapper for daemon
buildstatus iOS: daemon for iOS jailbreak devices, C client-server API
buildstatus mtk: daemon for rooted Android devices, based on Mediatek MT65xx processor, Java and C client-server API

Supported Chipsets

Chipsets Status
TI CC256x, WL183x complete incl. eHCIll support (chipset-cc256x)
CSR 8811, 8510 H4 only (chipset-csr)
STM STLC2500D working, no support for custom deep sleep management (chipset-stlc2500d)
TC35661 working, BLE patches missing (chipset-tc3566x)
EM 9301 experimental use on Arduino Shield (chipset-em9301)
CSR USB Dongles complete
Broadcom USB Dongles complete

Discussion and Community Support

BTstack Google Group

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Dual-mode Bluetooth stack, with small memory footprint.

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