def METHOD_NAME(self, open_state):
    """Opens or closses shutter
    :param open_state: open state
    :type open_state: bool
    :return: None
    """
    if open_state:
        if self._nominal_value == self.VALUES.CLOSED:
            self.open()
    else:
        if self._nominal_value == self.VALUES.OPEN:
            self.close()