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samples: Bluetooth: CAP Handover
Add a CAP Handover sample that uses the CAP handover API as the CAP Initiator and CAP commander. Signed-off-by: Emil Gydesen <[email protected]>
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‎samples/bluetooth/cap_handover/CMakeLists.txt‎

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# SPDX-License-Identifier: Apache-2.0
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cmake_minimum_required(VERSION 3.20.0)
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find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
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project(cap_handover)
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target_sources(app PRIVATE
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src/main.c
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)
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zephyr_library_include_directories(${ZEPHYR_BASE}/samples/bluetooth)

‎samples/bluetooth/cap_handover/Kconfig‎

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# Copyright (c) 2024 Nordic Semiconductor ASA
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# SPDX-License-Identifier: Apache-2.0
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mainmenu "Bluetooth: Common Audio Profile initiator sample"
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config SAMPLE_STATIC_BROADCAST_ID
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bool "Use static broadcast ID"
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default y
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help
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Enabling this option will make the application use static broadcast ID, as opposed to a
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randomly generated one.
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config SAMPLE_BROADCAST_ID
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hex "The static broadcast ID to use"
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range 0x000000 0xFFFFFF
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depends on STATIC_BROADCAST_ID
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default 0x123456
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help
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This is the 3-octet broadcast ID advertised if static broadcast IDs are enabled.
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source "Kconfig.zephyr"

‎samples/bluetooth/cap_handover/Kconfig.sysbuild‎

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# Copyright 2023 Nordic Semiconductor ASA
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# SPDX-License-Identifier: Apache-2.0
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source "share/sysbuild/Kconfig"
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config NET_CORE_BOARD
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string
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default "nrf5340dk/nrf5340/cpunet" if "$(BOARD)" = "nrf5340dk"
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default "nrf5340_audio_dk/nrf5340/cpunet" if "$(BOARD)" = "nrf5340_audio_dk"
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default "nrf5340bsim/nrf5340/cpunet" if $(BOARD_TARGET_STRING) = "NRF5340BSIM_NRF5340_CPUAPP"
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config NET_CORE_IMAGE_HCI_IPC
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bool "HCI IPC image on network core"
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default y
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depends on NET_CORE_BOARD != ""

‎samples/bluetooth/cap_handover/README.rst‎

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.. zephyr:code-sample:: bluetooth_cap_handover
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:name: Common Audio Profile (CAP) Handover
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:relevant-api: bluetooth bt_bap bt_cap bt_conn
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Connects to a CAP acceptor and performs CAP handover procedures
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Overview
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********
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Application demonstrating the CAP handover functionality.
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Starts by scanning for a CAP Acceptor then sets up unicast audio, and then switches between unicast
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and broadcast using the CAP handover procedures.
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This sample can be found under :zephyr_file:`samples/bluetooth/cap_handover` in the Zephyr tree.
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Check the :zephyr:code-sample-category:`bluetooth` samples for general information.
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Requirements
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************
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* BlueZ running on the host, or
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* A board with Bluetooth Low Energy 5.2 support
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Building and Running
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********************
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When building targeting an nrf52 series board with the Zephyr Bluetooth Controller,
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use ``-DEXTRA_CONF_FILE=overlay-bt_ll_sw_split.conf`` to enable the required ISO
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feature support.
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Building for an nrf5340dk
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-------------------------
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You can build both the application core image and an appropriate controller image for the network
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core with:
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.. zephyr-app-commands::
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:zephyr-app: samples/bluetooth/cap_handover/
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:board: nrf5340dk/nrf5340/cpuapp
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:goals: build
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:west-args: --sysbuild
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If you prefer to only build the application core image, you can do so by doing instead:
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.. zephyr-app-commands::
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:zephyr-app: samples/bluetooth/cap_handover/
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:board: nrf5340dk/nrf5340/cpuapp
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:goals: build
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In that case you can pair this application core image with the
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:zephyr:code-sample:`bluetooth_hci_ipc` sample
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:zephyr_file:`samples/bluetooth/hci_ipc/nrf5340_cpunet_iso-bt_ll_sw_split.conf` configuration.
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Building for a simulated nrf5340bsim
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------------------------------------
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Similarly to how you would for real HW, you can do:
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.. zephyr-app-commands::
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:zephyr-app: samples/bluetooth/cap_handover/
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:board: nrf5340bsim/nrf5340/cpuapp
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:goals: build
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:west-args: --sysbuild
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Note this will produce a Linux executable in :file:`./build/zephyr/zephyr.exe`.
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For more information, check :ref:`this board documentation <nrf5340bsim>`.
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Building for a simulated nrf52_bsim
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-----------------------------------
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.. zephyr-app-commands::
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:zephyr-app: samples/bluetooth/cap_handover/
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:board: nrf52_bsim
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:goals: build
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:gen-args: -DEXTRA_CONF_FILE=overlay-bt_ll_sw_split.conf

‎samples/bluetooth/cap_handover/boards/nrf5340_audio_dk_nrf5340_cpuapp.conf‎

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CONFIG_BT_BUF_EVT_RX_SIZE=255
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CONFIG_BT_BUF_ACL_RX_SIZE=255
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CONFIG_BT_BUF_ACL_TX_SIZE=251
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CONFIG_BT_BUF_CMD_TX_SIZE=255

‎samples/bluetooth/cap_handover/boards/nrf5340dk_nrf5340_cpuapp.conf‎

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CONFIG_BT_BUF_EVT_RX_SIZE=255
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CONFIG_BT_BUF_ACL_RX_SIZE=255
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CONFIG_BT_BUF_ACL_TX_SIZE=251
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CONFIG_BT_BUF_CMD_TX_SIZE=255

‎samples/bluetooth/cap_handover/overlay-bt_ll_sw_split.conf‎

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# Zephyr Bluetooth Controller
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CONFIG_BT_LL_SW_SPLIT=y
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# Zephyr Controller tested maximum advertising data that can be set in a single HCI command
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CONFIG_BT_CTLR_SCAN_DATA_LEN_MAX=191
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CONFIG_BT_CTLR_ADV_DATA_LEN_MAX=191
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# Support the highest SDU size required by any BAP LC3 presets (155) + 8 bytes of HCI ISO Data
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# packet overhead (the Packet_Sequence_Number, ISO_SDU_Length, Packet_Status_Flag fields; and
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# the optional Time_Stamp field, if supplied)
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CONFIG_BT_CTLR_ISO_TX_BUFFER_SIZE=163
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CONFIG_BT_CTLR_ISO_TX_SDU_LEN_MAX=155

‎samples/bluetooth/cap_handover/prj.conf‎

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CONFIG_LOG=y
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CONFIG_BT=y
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CONFIG_BT_BROADCASTER=y
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CONFIG_BT_CENTRAL=y
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CONFIG_BT_GATT_CLIENT=y
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CONFIG_BT_GATT_AUTO_DISCOVER_CCC=y
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CONFIG_BT_GATT_AUTO_UPDATE_MTU=y
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CONFIG_BT_GATT_DYNAMIC_DB=y
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CONFIG_BT_KEYS_OVERWRITE_OLDEST=y
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CONFIG_BT_SMP=y
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CONFIG_BT_EXT_ADV=y
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CONFIG_BT_PER_ADV=y
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CONFIG_BT_PER_ADV_SYNC=yq
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CONFIG_BT_DEVICE_NAME="CAP handover central"
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CONFIG_BT_AUDIO=y
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# ISO configs
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CONFIG_BT_ISO_MAX_CHAN=2
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CONFIG_BT_ISO_CENTRAL=y
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CONFIG_BT_ISO_BROADCASTER=y
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CONFIG_BT_ISO_SYNC_RECEIVER=y
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# BAP configs
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CONFIG_BT_BAP_BROADCAST_ASSISTANT=y
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CONFIG_BT_BAP_UNICAST_CLIENT=y
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CONFIG_BT_BAP_UNICAST_CLIENT_GROUP_STREAM_COUNT=2
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CONFIG_BT_BAP_UNICAST_CLIENT_ASE_SNK_COUNT=2
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CONFIG_BT_BAP_UNICAST_CLIENT_ASE_SRC_COUNT=2
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CONFIG_BT_BAP_SCAN_DELEGATOR=y
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CONFIG_BT_BAP_BROADCAST_SOURCE=y
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CONFIG_BT_BAP_BROADCAST_SRC_STREAM_COUNT=2
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CONFIG_BT_BAP_BROADCAST_SRC_SUBGROUP_COUNT=1
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CONFIG_BT_BAP_BROADCAST_ASSISTANT=y
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# CAP configs
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CONFIG_BT_CAP_INITIATOR=y
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CONFIG_BT_CAP_COMMANDER=y
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CONFIG_BT_CAP_HANDOVER=y
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# CSIP configs
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CONFIG_BT_CSIP_SET_COORDINATOR=y

‎samples/bluetooth/cap_handover/sample.yaml‎

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sample:
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description: Bluetooth Low Energy Common Audio Profile Handover sample
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name: Bluetooth Low Energy Common Audio Profile Handover sample
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tests:
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sample.bluetooth.cap_handover:
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harness: bluetooth
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platform_allow:
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- qemu_cortex_m3
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- qemu_x86
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- nrf5340dk/nrf5340/cpuapp
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- nrf5340bsim/nrf5340/cpuapp
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integration_platforms:
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- qemu_x86
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- nrf5340dk/nrf5340/cpuapp
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tags: bluetooth
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sysbuild: true
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sample.bluetooth.cap_handover.bt_ll_sw_split:
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harness: bluetooth
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platform_allow:
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- nrf52_bsim
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- nrf52833dk/nrf52833
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- nrf52840dk/nrf52840
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- nrf52840dongle/nrf52840
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integration_platforms:
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- nrf52_bsim
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- nrf52833dk/nrf52833
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- nrf52840dk/nrf52840
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- nrf52840dongle/nrf52840
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extra_args: EXTRA_CONF_FILE=overlay-bt_ll_sw_split.conf
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tags: bluetooth

‎samples/bluetooth/cap_handover/src/cap_initiator.h‎

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/*
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* Copyright (c) 2025 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdint.h>
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#include <zephyr/bluetooth/audio/bap.h>
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#include <zephyr/bluetooth/audio/cap.h>
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#include <zephyr/bluetooth/conn.h>
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struct tx_stream {
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struct bt_cap_stream *stream;
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uint16_t seq_num;
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};
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/**
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* @brief Initialize TX
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*
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* This will initialize TX if not already initialized. This creates and starts a thread that
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* will attempt to send data on all streams registered with cap_initiator_tx_register_stream().
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*/
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void cap_initiator_tx_init(void);
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/**
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* @brief Register a stream for TX
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*
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* This will add it to the list of streams the TX thread will attempt to send on.
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*
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* @retval 0 on success
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* @retval -EINVAL if @p cap_stream is NULL
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* @retval -ENOMEM if not more streams can be registered
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*/
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int cap_initiator_tx_register_stream(struct bt_cap_stream *cap_stream);
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/**
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* @brief Unregister a stream for TX
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*
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* This will remove it to the list of streams the TX thread will attempt to send on.
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*
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* @retval 0 on success
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* @retval -EINVAL if @p cap_stream is NULL
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* @retval -EALREADY if the stream is currently not registered
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*/
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int cap_initiator_tx_unregister_stream(struct bt_cap_stream *cap_stream);

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