BTstack is distributed under a dual license. The open source version for non-commercial use has an active community to support your hobby projects and tinkering. For the non-commercial version, please visit BTstack.org, and for documentation BTstack Manual v1.1.
The embedded version runs with or without a real-time system and has been ported to the TI MSP430 line of MCUs with full support for TI’s CC256x Bluetooth 4.0 chipsets as a showcase. The iOS version of BTstack is used with more than two million iOS devices and provides the base for several successful iOS system extension: BTstack Keyboard, BTstack Mouse, BTstack GPS and Celeste (OBEX).