def bool_to_str(value: bool) ->str:
    """Converts boolean to 'ON' or 'OFF' string."""
    if type(value) is bool:
        return 'ON' if value is True else 'OFF'
    else:
        raise Exception(
            f"bool_to_str: unsupported variable type '{type(value)}', value '{value}'. Only boolean values are supported."
            )
