docs: def send(self, channel, payload):
          """Send a message with the given payload on the given channel.
          Messages are broadcast to all players in the group.
          """
          with track('send_channel=' + channel):
              with track('create event'):
                  Event.objects.create(
                      group=self,
                      channel=channel,
                      value=payload)
              ChannelGroup(str(self.pk)).send(
                      {'text': json.dumps({
                          'channel': channel,
                          'payload': payload
                      })})