Add a new board_ext board

The goal of this board is to allow an external program to manage the
building/flashing and getting the resetting command.

autopts/ptsprojects/boards/board_ext.py

@@ -0,0 +1,67 @@
+#
+# auto-pts - The Bluetooth PTS Automation Framework
+#
+# Copyright (c) 2024, Nordic Semiconductor ASA.
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms and conditions of the GNU General Public License,
+# version 2, as published by the Free Software Foundation.
+#
+# This program is distributed in the hope it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+
+import os
+import logging
+import subprocess
+
+supported_projects = ["zephyr"]
+
+def reset_cmd(iutctl):
+    """Return reset command for DUT
+    """
+
+    get_reset_cmd = os.getenv("AUTOPTS_RESET_CMD")
+    if get_reset_cmd is None:
+        raise Exception("AUTOPTS_RESET_CMD env variable is not set")
+
+    cmd = subprocess.run(
+        [get_reset_cmd, "--snr", f"{iutctl.debugger_snr}"],
+        check=True,
+        stdout=subprocess.PIPE,
+    )
+
+    return cmd.stdout.decode()
+
+
+def build_and_flash(zephyr_wd, board, debugger_snr, conf_file=None, *args):
+    """Build and flash Zephyr binary
+    :param zephyr_wd: Zephyr source path
+    :param board: IUT
+    :param debugger_snr serial number
+    :param conf_file: configuration file to be used
+    """
+
+    build_and_flash_cmd = os.getenv("AUTOPTS_BUILD_FLASH_CMD")
+    if build_and_flash_cmd is None:
+        raise Exception("AUTOPTS_BUILD_FLASH_CMD env variable is not set")
+
+    logging.debug("%s: %s %s %s", build_and_flash.__name__, zephyr_wd, board, conf_file)
+
+    tester_dir = os.path.join(zephyr_wd, "tests", "bluetooth", "tester")
+
+    # board is not send to program as it's not set and this file may be used for different boards
+    # the program is expected to retrieve board information from SNR
+    subprocess.run(
+        [
+            build_and_flash_cmd,
+            "--snr",
+            f"{debugger_snr}",
+            "--config",
+            f"{conf_file}",
+        ],
+        check=True,
+        cwd=tester_dir,
+    )