tests: bluetooth: add key persistence test cases

tests/bluetooth/classic/smp_key_persist/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+set(NO_QEMU_SERIAL_BT_SERVER 1)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(bluetooth)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/bluetooth/classic/smp_key_persist/README.rst

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+.. _bluetooth_classic_smp_key_persist_tests:
+
+Bluetooth Classic SMP Key Save Tests
+##################################
+
+Overview
+********
+
+This test suite uses ``bumble`` for testing Bluetooth Classic communication between a host
+PC (running :ref:`Twister <twister_script>`) and a device under test (DUT) running Zephyr.
+
+Prerequisites
+*************
+
+The test suite has the following prerequisites:
+
+* The ``bumble`` library installed on the host PC.
+The Bluetooth Classic controller on PC side is required. Refer to getting started of `bumble`_
+for details.
+
+The HCI transport for ``bumble`` can be configured as follows:
+
+* A specific configuration context can be provided along with the ``usb_hci`` fixture separated by
+  a ``:`` (i.e. specify fixture ``usb_hci:usb:0`` to use the ``usb:0`` as hci transport for
+  ``bumble``).
+* The configuration context can be overridden using the `hci transport`_ can be provided using the
+  ``--hci-transport`` test suite argument (i.e. run ``twister`` with the
+  ``--pytest-args=--hci-transport=usb:0`` argument to use the ``usb:0`` as hci transport for
+  ``bumble``).
+
+Building and Running
+********************
+
+Running on mimxrt1170_evk@B/mimxrt1176/cm7
+==========================================
+
+Running the test suite on :ref:`mimxrt1170_evk` relies on configuration of ``bumble``.
+
+On the host PC, a HCI transport needs to be required. Refer to `bumble platforms`_ page of
+``bumble`` for details.
+
+For example, on windows, a PTS dongle is used. After `WinUSB driver`_ has been installed,
+the HCI transport would be USB transport interface ``usb:<index>``.
+
+If the HCI transport is ``usb:0`` and debug console port is ``COM4``, the test suite can be
+launched using Twister:
+
+.. code-block:: shell
+
+   west twister -v -p mimxrt1170_evk@B/mimxrt1176/cm7 --device-testing --device-serial COM4 -T tests/bluetooth/classic/smp_key_persist -O smp_key_persist --force-platform --west-flash --west-runner=jlink -X usb_hci:usb:0
+
+Running on Hardware
+===================
+
+Running the test suite on hardware requires a HCI transport connected to the host PC.
+
+The test suite can be launched using Twister. Below is an example for running on the
+:zephyr:board:`mimxrt1170_evk@B/mimxrt1176/cm7`:
+
+.. code-block:: shell
+
+   west twister -v -p mimxrt1170_evk@B/mimxrt1176/cm7 --device-testing --device-serial COM4 -T tests/bluetooth/classic/smp_key_persist -O smp_key_persist --force-platform --west-flash --west-runner=jlink -X usb_hci:usb:0
+
+.. _bumble:
+   https://google.github.io/bumble/getting_started.html
+
+.. _hci transport:
+   https://google.github.io/bumble/transports/index.html
+
+.. _bumble platforms:
+   https://google.github.io/bumble/platforms/index.html
+
+.. _WinUSB driver:
+   https://google.github.io/bumble/platforms/windows.html

tests/bluetooth/classic/smp_key_persist/boards/mimxrt1170_evk_mimxrt1176_cm7_B.conf

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+#select NXP NW612 Chipset
+CONFIG_BT_NXP_NW612=y
+
+CONFIG_ENTROPY_GENERATOR=y

tests/bluetooth/classic/smp_key_persist/boards/mimxrt1170_evk_mimxrt1176_cm7_B.overlay

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+/*
+ * Copyright 2024 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	chosen {
+		zephyr,sram = &dtcm;
+	};
+};

tests/bluetooth/classic/smp_key_persist/prj.conf

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+CONFIG_BT=y
+CONFIG_BT_CLASSIC=y
+CONFIG_BT_SMP=y
+CONFIG_BT_SHELL=y
+CONFIG_LOG=y
+CONFIG_ZTEST=y
+CONFIG_REBOOT=y
+CONFIG_BT_SETTINGS=y
+CONFIG_FLASH=y
+CONFIG_FLASH_MAP=y
+CONFIG_NVS=y
+CONFIG_SETTINGS=y
+# CONFIG_FLASH=y
+# CONFIG_FLASH_MAP=y
+# CONFIG_NVS=y
+# CONFIG_SETTINGS_NVS=y
+# CONFIG_SETTINGS=y
+# CONFIG_BT_SETTINGS=y
+# CONFIG_MPU_ALLOW_FLASH_WRITE=y
+
+CONFIG_BT_DEVICE_NAME="smp_key_persist"
+
+CONFIG_BT_CREATE_CONN_TIMEOUT=30
+CONFIG_BT_PAGE_TIMEOUT=0xFFFF

tests/bluetooth/classic/smp_key_persist/pytest/conftest.py

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+# Copyright 2024 NXP
+#
+# SPDX-License-Identifier: Apache-2.0
+
+import logging
+import re
+
+import pytest
+from twister_harness import DeviceAdapter, Shell
+
+logger = logging.getLogger(__name__)
+
+
+def pytest_addoption(parser) -> None:
+    """Add local parser options to pytest."""
+    parser.addoption('--hci-transport', default=None, help='Configuration HCI transport for bumble')
+
+
+@pytest.fixture(name='initialize', scope='session')
+def fixture_initialize(request, shell: Shell, dut: DeviceAdapter):
+    """Session initializtion"""
+    # Get HCI transport for bumble
+    hci = request.config.getoption('--hci-transport')
+
+    if hci is None:
+        for fixture in dut.device_config.fixtures:
+            if fixture.startswith('usb_hci:'):
+                hci = fixture.split(sep=':', maxsplit=1)[1]
+                break
+
+    assert hci is not None
+
+    lines = shell.exec_command("bt init")
+    lines = dut.readlines_until("Settings Loaded")
+    regex = r'Identity: *(?P<bd_addr>(.*?):(.*?):(.*?):(.*?):(.*?):(.*?) *\((.*?)\))'
+    bd_addr = None
+    for line in lines:
+        logger.info(f"Shell log {line}")
+        m = re.search(regex, line)
+        if m:
+            bd_addr = m.group('bd_addr')
+
+    if bd_addr is None:
+        logger.error('Fail to get IUT BD address')
+        raise AssertionError
+
+    lines = shell.exec_command("br pscan on")
+    lines = shell.exec_command("br iscan on")
+    logger.info('initialized')
+    return hci, bd_addr
+
+
+@pytest.fixture
+def smp_initiator_dut(initialize):
+    logger.info('Start running testcase')
+    yield initialize
+    logger.info('Done')