code: def close(self):
          
          # Stop the comm thread
          self._thread.stop()
  
          # Close the USB dongle
          if self._radio_manager:
              self._radio_manager.close()
          self._radio_manager = None
  
          while not self.out_queue.empty():
              self.out_queue.get()
  
          # Clear callbacks
          self.link_error_callback = None
          self.link_quality_callback = None
docs: Close the link.