docs: def group_toggle(self, addr, use_cache=True):
          """Toggle the value of an 1-bit group address.
  
          If the object has a value != 0, it will be set to 0, otherwise to 1
          """
          data = self.group_read(addr, use_cache)
          if len(data) != 1:
              problem = "Can't toggle a {}-octet group address {}".format(
                  len(data), addr)
              logging.error(problem)
              raise KNXException(problem)
  
          if data[0] == 0:
              self.group_write(addr, [1])
          elif data[0] == 1:
              self.group_write(addr, [0])
          else:
              problem = "Can't toggle group address {} as value is {}".format(
                  addr, data[0])
              logging.error(problem)
              raise KNXException(problem)