Samples: Bluetooth: Add peripheral with multiple identities sample

Adding a peripheral sample where a single physical device can create
and manage multiple advertisers, making it appear as multiple
distinct devices. The peripheral will set up as many advertisers as
defined by CONFIG_BT_EXT_ADV_MAX_ADV_SET.
Each advertisers will each contain a unique identity and therefore
random address. Once a disconnected event is received the
associated advertiser will immediately start again.

Signed-off-by: Thomas Deppe <[email protected]>

CODEOWNERS

@@ -451,6 +451,7 @@
 /samples/bluetooth/peripheral_rscs/       @nrfconnect/ncs-si-muffin
 /samples/bluetooth/peripheral_status/     @nrfconnect/ncs-si-muffin
 /samples/bluetooth/peripheral_uart/       @nrfconnect/ncs-si-muffin
+/samples/bluetooth/peripheral_with_multiple_identities/ @nrfconnect/ncs-dragoon
 /samples/bluetooth/radio_coex_1wire/      @nrfconnect/ncs-dragoon
 /samples/bluetooth/radio_notification_cb/ @nrfconnect/ncs-dragoon
 /samples/bluetooth/rpc_host/              @nrfconnect/ncs-si-muffin

doc/nrf/releases_and_maturity/releases/release-notes-changelog.rst

@@ -299,6 +299,7 @@ Bluetooth samples
 
   * The :ref:`channel_sounding_ras_reflector` sample demonstrating how to implement a Channel Sounding Reflector that exposes the Ranging Responder GATT Service.
   * The :ref:`channel_sounding_ras_initiator` sample demonstrating basic distance estimation with Channel Sounding by setting up a Channel Sounding Initiator that acts as a Ranging Requestor GATT Client.
+  * The :ref:`bt_peripheral_with_multiple_identities` sample demonstrating how to use a single physical device to create and manage multiple advertisers, making it appear as multiple distinct devices by assigning each a unique identity.
   * Support for the ``nrf54l15dk/nrf54l05/cpuapp`` and ``nrf54l15dk/nrf54l10/cpuapp`` board targets in the following samples:
 
     * :ref:`direct_test_mode`

samples/bluetooth/peripheral_with_multiple_identities/CMakeLists.txt

@@ -0,0 +1,11 @@
+#
+# Copyright (c) 2024 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+cmake_minimum_required(VERSION 3.20.0)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(peripheral_with_multiple_identities)
+
+target_sources(app PRIVATE src/main.c)

samples/bluetooth/peripheral_with_multiple_identities/Kconfig.sysbuild

@@ -0,0 +1,13 @@
+#
+# Copyright (c) 2024 Nordic Semiconductor
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+
+source "${ZEPHYR_BASE}/share/sysbuild/Kconfig"
+
+config NRF_DEFAULT_BLUETOOTH
+	default y
+
+config NRF_DEFAULT_IPC_RADIO
+	default y

samples/bluetooth/peripheral_with_multiple_identities/README.rst

@@ -0,0 +1,238 @@
+.. _bt_peripheral_with_multiple_identities:
+
+Bluetooth: Peripheral with multiple identities
+##############################################
+
+.. contents::
+   :local:
+   :depth: 2
+
+The sample demonstrates how to use a single physical device to create and manage multiple advertisers, making it appear as multiple distinct devices by assigning each a unique identity.
+You can use this sample to test a central device that requires connections to multiple peripheral devices when you do not have several development kits available.
+
+Requirements
+************
+
+The sample supports the following development kits:
+
+.. table-from-sample-yaml::
+
+Overview
+********
+
+Each Bluetooth® device is identified by its identity address.
+When a peripheral is advertising, it uses this identity address or generates an address from this address using an Identity Resolving Key (IRK).
+The sample application starts multiple connectable advertisers, each with their own identity, allowing a single device to advertise as multiple devices.
+
+This sample has the following features:
+
+* It uses a single physical device to emulate multiple Bluetooth advertisers.
+* Each advertiser is assigned a unique identity and a corresponding random static address, ensuring they can be distinctly identified.
+* Advertisers are restarted upon disconnection.
+
+Number of advertisers
+=====================
+
+The sample sets up and starts as many advertisers as specified by the :kconfig:option:`CONFIG_BT_EXT_ADV_MAX_ADV_SET` Kconfig option.
+If the values specified in the configurations are not equal, additional considerations are required to ensure proper setup and restarting of each advertiser.
+
+Creating multiple identities
+============================
+
+The :c:func:`create_id` function configures a new identity by passing an identity value within the range ``0`` to the value set in the :kconfig:option:`CONFIG_BT_ID_MAX` Kconfig option.
+
+The identities are created using the :c:func:`bt_id_create` API, where both arguments are set to ``NULL``.
+This generates a new random static address and a random IRK for the identity.
+Alternatively, you can pass a specific address and IRK values can be passed to customize the identity's configuration.
+
+Setting up and initializing advertisers
+=======================================
+
+Each advertiser is set up as a *connectable legacy advertiser* with a long advertising interval.
+You can adjust these values to specific use cases using the :c:struct:`bt_le_adv_param` structure.
+Set the :c:member:`bt_le_adv_param.id` field to assign a given identity to an advertiser.
+
+The extended advertising version of the API is used as it supports multiple advertising instances and sets.
+These instances are stored in an array where the advertiser's identity serves as the index, to simplify the retrieval and management.
+A unique name is generated for each advertiser combining :kconfig:option:`CONFIG_BT_DEVICE_NAME` with its identity.
+This is set by using the :c:func:`bt_le_ext_adv_set_data` function.
+
+Starting an advertiser
+======================
+
+A work item is initialized for each advertiser to ensure that tasks are executed independently, preventing race conditions and avoiding blocking within callback functions.
+Each advertiser's work item is submitted to the work queue, where it is started using the :c:func:`bt_le_ext_adv_start` function.
+By default, this function does not attempt to resume connectable advertising after a connection is established.
+
+Connection callbacks
+====================
+
+After the initial setup of each advertiser, the sample continues to execute asynchronously using callbacks to define its behavior.
+The sample uses the following two connection callbacks (see the :c:struct:`bt_conn_cb` structure):
+
+* Connected callback - When a connection is established, the sample prints the central's address.
+* Disconnected callback - When a disconnection occurs, the central's address is printed along with the advertiser that was disconnected.
+  The identity associated with the connection is retrieved by calling the :c:func:`bt_conn_get_info()` function to obtain :c:member:`bt_conn_info.id`.
+  The work item (advertiser) associated with this identity is submitted to the work queue to restart the advertiser.
+  The identity is used as the index to retrieve the associated advertiser from the array.
+
+Extending the sample
+====================
+
+You can also add the following features to this sample:
+
+* Increase the number of advertisers - Modify the configuration options listed above to support more advertisers.
+* Customize individual advertisers - Extend the :c:struct:`advertiser_info` structure to customize advertising parameters, advertising data, and a name for each advertiser.
+* Custom advertising data - Customize the advertising data to include additional information, in addition to supporting scan responses.
+* Reuse identities for multiple advertisers - Once all identities have been initialized, the sample supports reuse for other advertisers.
+* Advanced features - Extend the sample to implement other Bluetooth features or use it in conjunction with other samples.
+
+Configuration
+*************
+
+|config|
+
+Check and configure the following Kconfig options:
+
+* :kconfig:option:`CONFIG_BT_ID_MAX` defines how many identities will be used.
+
+* :kconfig:option:`CONFIG_BT_MAX_CONN` defines how many connections can be established.
+  The sample expects this configuration to be set to the same value as :kconfig:option:`CONFIG_BT_ID_MAX`.
+
+* :kconfig:option:`CONFIG_BT_EXT_ADV_MAX_ADV_SET` defines the maximum number of advertising sets available.
+  The sample expects this configuration to be set to the same value as :kconfig:option:`CONFIG_BT_ID_MAX`.
+
+* :kconfig:option:`CONFIG_BT_DEVICE_NAME` defines the base name given to each advertiser.
+
+Building and running
+********************
+
+.. |sample path| replace:: :file:`samples/bluetooth/peripheral_with_multiple_identities`
+
+.. include:: /includes/build_and_run_ns.txt
+
+Testing
+=======
+
+|test_sample|
+
+1. |connect_kit|
+#. |connect_terminal|
+#. Start the `nRF Connect for Mobile`_ application on your smartphone or tablet.
+
+   There should now be multiple devices advertising with the name ``Nordic Peripheral ID`` followed by the ID.
+#. Connect to the device and observe that the central's address is printed.
+#. Disconnect from any device and observe that the correct advertiser is disconnected.
+#. The disconnected advertiser is restarted.
+#. In the **SCANNER** tab, observe that there are still the configured number of advertisers.
+
+Sample output
+=============
+
+The result should look similar to the following output::
+
+   I: SoftDevice Controller build revision:
+   I: d6 da c7 ae 08 db 72 6f |......ro
+   I: 2a a3 26 49 2a 4d a8 b3 |*.&I*M..
+   I: 98 0e 07 7f             |....
+   I: HW Platform: Nordic Semiconductor (0x0002)
+   I: HW Variant: nRF52x (0x0002)
+   I: Firmware: Standard Bluetooth controller (0x00) Version 58.49843 Build 3849690618
+   I: Identity: FA:BB:79:57:D6:45 (random)
+   I: HCI: version 6.0 (0x0e) revision 0x1055, manufacturer 0x0059
+   I: LMP: version 6.0 (0x0e) subver 0x1055
+   Bluetooth initialized
+   Starting 20 advertisers
+   Using current id: 0
+   Created Nordic Peripheral ID: 0: 0x2000bce8
+   Advertiser 0 successfully started
+   New id: 1
+   Using current id: 1
+   Created Nordic Peripheral ID: 1: 0x2000bd00
+   Advertiser 1 successfully started
+   New id: 2
+   Using current id: 2
+   Created Nordic Peripheral ID: 2: 0x2000bd18
+   Advertiser 2 successfully started
+   New id: 3
+   Using current id: 3
+   Created Nordic Peripheral ID: 3: 0x2000bd30
+   Advertiser 3 successfully started
+   New id: 4
+   Using current id: 4
+   Created Nordic Peripheral ID: 4: 0x2000bd48
+   Advertiser 4 successfully started
+   New id: 5
+   Using current id: 5
+   Created Nordic Peripheral ID: 5: 0x2000bd60
+   Advertiser 5 successfully started
+   New id: 6
+   Using current id: 6
+   Created Nordic Peripheral ID: 6: 0x2000bd78
+   Advertiser 6 successfully started
+   New id: 7
+   Using current id: 7
+   Created Nordic Peripheral ID: 7: 0x2000bd90
+   Advertiser 7 successfully started
+   New id: 8
+   Using current id: 8
+   Created Nordic Peripheral ID: 8: 0x2000bda8
+   Advertiser 8 successfully started
+   New id: 9
+   Using current id: 9
+   Created Nordic Peripheral ID: 9: 0x2000bdc0
+   Advertiser 9 successfully started
+   New id: 10
+   Using current id: 10
+   Created Nordic Peripheral ID: 10: 0x2000bdd8
+   Advertiser 10 successfully started
+   New id: 11
+   Using current id: 11
+   Created Nordic Peripheral ID: 11: 0x2000bdf0
+   Advertiser 11 successfully started
+   New id: 12
+   Using current id: 12
+   Created Nordic Peripheral ID: 12: 0x2000be08
+   Advertiser 12 successfully started
+   New id: 13
+   Using current id: 13
+   Created Nordic Peripheral ID: 13: 0x2000be20
+   Advertiser 13 successfully started
+   New id: 14
+   Using current id: 14
+   Created Nordic Peripheral ID: 14: 0x2000be38
+   Advertiser 14 successfully started
+   New id: 15
+   Using current id: 15
+   Created Nordic Peripheral ID: 15: 0x2000be50
+   Advertiser 15 successfully started
+   New id: 16
+   Using current id: 16
+   Created Nordic Peripheral ID: 16: 0x2000be68
+   Advertiser 16 successfully started
+   New id: 17
+   Using current id: 17
+   Created Nordic Peripheral ID: 17: 0x2000be80
+   Advertiser 17 successfully started
+   New id: 18
+   Using current id: 18
+   Created Nordic Peripheral ID: 18: 0x2000be98
+   Advertiser 18 successfully started
+   New id: 19
+   Using current id: 19
+   Created Nordic Peripheral ID: 19: 0x2000beb0
+   Advertiser 19 successfully started
+
+Dependencies
+************
+
+The sample uses the following Zephyr libraries:
+
+* :file:`include/kernel.h`
+* :file:`include/sys/printk.h`
+
+* :ref:`zephyr:bluetooth_api`:
+
+  * :file:`include/bluetooth/bluetooth.h`
+  * :file:`include/bluetooth/conn.h`
+  * :file:`include/bluetooth/hci.h`

samples/bluetooth/peripheral_with_multiple_identities/boards/nrf5340dk_nrf5340_cpuapp.conf

@@ -0,0 +1,8 @@
+#
+# Copyright (c) 2024 Nordic Semiconductor
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+
+# Application core does not have BLE controller. Disable controller related options.
+CONFIG_BT_CTLR_ADV_EXT=n

samples/bluetooth/peripheral_with_multiple_identities/boards/nrf54h20dk_nrf54h20_cpuapp.conf

@@ -0,0 +1,8 @@
+#
+# Copyright (c) 2024 Nordic Semiconductor
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+
+# Application core does not have BLE controller. Disable controller related options.
+CONFIG_BT_CTLR_ADV_EXT=n

samples/bluetooth/peripheral_with_multiple_identities/prj.conf

@@ -0,0 +1,16 @@
+#
+# Copyright (c) 2024 Nordic Semiconductor
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+
+CONFIG_NCS_SAMPLES_DEFAULTS=y
+CONFIG_BT_DEVICE_NAME="Nordic Peripheral ID"
+CONFIG_BT=y
+CONFIG_BT_PERIPHERAL=y
+CONFIG_BT_EXT_ADV=y
+
+CONFIG_BT_EXT_ADV_MAX_ADV_SET=20
+CONFIG_BT_MAX_CONN=20
+CONFIG_BT_ID_MAX=20
+CONFIG_BT_BUF_ACL_RX_COUNT=21

samples/bluetooth/peripheral_with_multiple_identities/sample.yaml

@@ -0,0 +1,22 @@
+sample:
+  description: Peripheral with multiple identities sample
+  name: Peripheral with multiple identities
+tests:
+  sample.bluetooth.peripheral_with_multiple_identities:
+    sysbuild: true
+    build_only: true
+    integration_platforms:
+      - nrf52840dk/nrf52840
+      - nrf5340dk/nrf5340/cpuapp
+      - nrf54l15dk/nrf54l05/cpuapp
+      - nrf54l15dk/nrf54l10/cpuapp
+      - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54h20dk/nrf54h20/cpurad
+    platform_allow:
+      - nrf52840dk/nrf52840
+      - nrf5340dk/nrf5340/cpuapp
+      - nrf54l15dk/nrf54l05/cpuapp
+      - nrf54l15dk/nrf54l10/cpuapp
+      - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54h20dk/nrf54h20/cpurad
+    tags: bluetooth ci_build sysbuild