docs: def set_relay_off(self):
          """Turn the relay off."""
          if self.get_relay_state():
              try:
                  request = requests.get(
                      '{}/relay'.format(self.resource), params={'state': '0'},
                      timeout=self.timeout)
                  if request.status_code == 200:
                      self.data['relay'] = False
              except requests.exceptions.ConnectionError:
                  raise exceptions.MyStromConnectionError()