code: def complex_request(self, request, wait_for_first_response=True):
          
          receiver = self._prepare_response_receiver(request,
                  receiver_class=CommandResponseReceiver)
          self._send_complex_request(request)
  
          responses = []
          if wait_for_first_response:
              responses = receiver.wait_for_responses()
          return responses
docs: Send a compound command request to the interface over the normal data
          channel.
  
          request - A dict storing the request to send to the VI. It will be
              serialized to the currently selected output format.
          wait_for_first_response - If true, this function will block waiting for
              a response from the VI and return it to the caller. Otherwise, it
              will send the command and return immediately and any response will
              be lost.