code: def new_cast_status(self, cast_status):
          
          new_channel = self.destination_id != cast_status.transport_id
  
          if new_channel:
              self.disconnect_channel(self.destination_id)
  
          self.app_namespaces = cast_status.namespaces
          self.destination_id = cast_status.transport_id
          self.session_id = cast_status.session_id
  
          if new_channel:
              # If any of the namespaces of the new app are supported
              # we will automatically connect to it to receive updates
              for namespace in self.app_namespaces:
                  if namespace in self._handlers:
                      self._ensure_channel_connected(self.destination_id)
                      self._handlers[namespace].channel_connected()
docs: Called when a new cast status has been received.