Bluetooth: Broadcast Audio Sink

Overview

Application demonstrating the LE Audio broadcast sink functionality. Starts by scanning for LE Audio broadcast sources and then synchronizes to the first found and listens to it until the source is (potentially) stopped.

This sample can be found under samples/bluetooth/bap_broadcast_sink in the Zephyr tree.

Check the bluetooth samples section for general information.

Use CONFIG_TARGET_BROADCAST_NAME Kconfig to specify the name (CONFIG_BT_DEVICE_NAME) of a broadcast source to listen to. With default value (empty string), sink device will listen to all available broadcast sources.

Requirements

  • BlueZ running on the host, or

  • A board with Bluetooth Low Energy 5.2 support

Building and Running

When building targeting an nrf52 series board with the Zephyr Bluetooth Controller, use -DOVERLAY_CONFIG=overlay-bt_ll_sw_split.conf to enable the required ISO feature support.

Building for an nrf5340dk

You can build both the application core image and an appropriate controller image for the network core with:

# From the root of the zephyr repository
west build -b nrf5340dk/nrf5340/cpuapp --sysbuild samples/bluetooth/bap_broadcast_sink/

If you prefer to only build the application core image, you can do so by doing instead:

# From the root of the zephyr repository
west build -b nrf5340dk/nrf5340/cpuapp samples/bluetooth/bap_broadcast_sink/

In that case you can pair this application core image with the hci_ipc sample samples/bluetooth/hci_ipc/nrf5340_cpunet_iso-bt_ll_sw_split.conf configuration.

Building for a simulated nrf5340bsim

Similarly to how you would for real HW, you can do:

# From the root of the zephyr repository
west build -b nrf5340bsim/nrf5340/cpuapp --sysbuild samples/bluetooth/bap_broadcast_sink/

Note this will produce a Linux executable in ./build/zephyr/zephyr.exe. For more information, check this board documentation.

Building for a simulated nrf52_bsim

# From the root of the zephyr repository
west build -b nrf52_bsim samples/bluetooth/bap_broadcast_sink/ -- -DOVERLAY_CONFIG=overlay-bt_ll_sw_split.conf