code: def send_dynamic_message(sender, message):
      
      dispatcher.send(
          signal=DYNAMIC_MESSAGE_SIGNAL,
          sender=sender,
          message=message)
docs: Send a dynamic message to the listeners.
  
      Dynamic messages represents a progress. Usually it will be appended to
      the previous messages.
  
      .. versionadded:: 3.3
  
      :param sender: The sender.
      :type sender: object
  
      :param message: An instance of our rich message class.
      :type message: safe.messaging.Message