code: def _connection_handler(self, event_name, data, channel_name):
          
          if channel_name in self.channels:
              self.channels[channel_name]._handle_event(event_name, data)
docs: Handle incoming data.
  
          :param str event_name: Name of the event.
          :param Any data: Data received.
          :param str channel_name: Name of the channel this event and data belongs to.