This fork of nRF Connect's sdk-zephyr repository adds support for BLE 5.1 connectionless Angle of Arrival (AoA) RTLS beacons on non-5.1 compliant nRF hardware.
This is achieved by extending the Nordic BLE stack LLL's Periodic Advertising Extensions capability to include the addition of a Constant Tone Extension (CTE).
This CTE capability is implemented purely in software and therefore does not require 5.1-compliant hardware such as the nRF52833 or nRF5340.
It can run on BLE 5.0 hardware such as the nRF52840, and has been tested on the nRF52840 PCA10059 dongle.
Add BT_CTLR_DF_SOFTCTE as a Kconfig flag to enable.
This repository also contains a minimal beacon implementation that does not use the bluetooth stack, but rather only uses the nRF Radio, Clock and Timer peripherals. It transmits a simple pre-5.0 BLE packet which includes TX Power, and also transmits a CTE. Both of these can be used to test positioning and RTLS systems without the need for 5.1-compliant hardware.
The Zephyr Project is a scalable real-time operating system (RTOS) supporting multiple hardware architectures, optimized for resource constrained devices, and built with security in mind.
The Zephyr OS is based on a small-footprint kernel designed for use on resource-constrained systems: from simple embedded environmental sensors and LED wearables to sophisticated smart watches and IoT wireless gateways.
The Zephyr kernel supports multiple architectures, including ARM Cortex-M, Intel x86, ARC, Nios II, Tensilica Xtensa, and RISC-V, and a large number of supported boards.
Welcome to Zephyr! See the Introduction to Zephyr for a high-level overview, and the documentation's Getting Started Guide to start developing.
Community support is provided via mailing lists and Slack; see the Resources below for details.
Here's a quick summary of resources to help you find your way around:
- Help: Asking for Help Tips
- Documentation: http://docs.zephyrproject.org (Getting Started Guide)
- Source Code: https://github.com/zephyrproject-rtos/zephyr is the main repository; https://elixir.bootlin.com/zephyr/latest/source contains a searchable index
- Releases: https://github.com/zephyrproject-rtos/zephyr/releases
- Samples and example code: see Sample and Demo Code Examples
- Mailing Lists: users@lists.zephyrproject.org and devel@lists.zephyrproject.org are the main user and developer mailing lists, respectively. You can join the developer's list and search its archives at Zephyr Development mailing list. The other Zephyr mailing list subgroups have their own archives and sign-up pages.
- Nightly CI Build Status: https://lists.zephyrproject.org/g/builds The builds@lists.zephyrproject.org mailing list archives the CI (shippable) nightly build results.
- Chat: Zephyr's Slack workspace is https://zephyrproject.slack.com. Use this Slack Invite to register.
- Contributing: see the Contribution Guide
- Wiki: Zephyr GitHub wiki
- Issues: https://github.com/zephyrproject-rtos/zephyr/issues
- Security Issues: Email vulnerabilities@zephyrproject.org to report security issues; also see our Security documentation. Security issues are tracked separately at https://zephyrprojectsec.atlassian.net.
- Zephyr Project Website: https://zephyrproject.org