code: def assist(self, text_query):
          
          def iter_assist_requests():
              config = embedded_assistant_pb2.AssistConfig(
                  audio_out_config=embedded_assistant_pb2.AudioOutConfig(
                      encoding='LINEAR16',
                      sample_rate_hertz=16000,
                      volume_percentage=0,
                  ),
                  dialog_state_in=embedded_assistant_pb2.DialogStateIn(
                      language_code=self.language_code,
                      conversation_state=self.conversation_state,
                      is_new_conversation=self.is_new_conversation,
                  ),
                  device_config=embedded_assistant_pb2.DeviceConfig(
                      device_id=self.device_id,
                      device_model_id=self.device_model_id,
                  ),
                  text_query=text_query,
              )
              # Continue current conversation with later requests.
              self.is_new_conversation = False
              if self.display:
                  config.screen_out_config.screen_mode = PLAYING
              req = embedded_assistant_pb2.AssistRequest(config=config)
              assistant_helpers.log_assist_request_without_audio(req)
              yield req
  
          text_response = None
          html_response = None
          for resp in self.assistant.Assist(iter_assist_requests(),
                                            self.deadline):
              assistant_helpers.log_assist_response_without_audio(resp)
              if resp.screen_out.data:
                  html_response = resp.screen_out.data
              if resp.dialog_state_out.conversation_state:
                  conversation_state = resp.dialog_state_out.conversation_state
                  self.conversation_state = conversation_state
              if resp.dialog_state_out.supplemental_display_text:
                  text_response = resp.dialog_state_out.supplemental_display_text
          return text_response, html_response
docs: Send a text request to the Assistant and playback the response.