code: async def authenticate_with_device(atv):
      
      credentials = await atv.airplay.generate_credentials()
      await atv.airplay.load_credentials(credentials)
  
      try:
          await atv.airplay.start_authentication()
          pin = input('PIN Code: ')
          await atv.airplay.finish_authentication(pin)
          print('Credentials: {0}'.format(credentials))
  
      except exceptions.DeviceAuthenticationError:
          print('Failed to authenticate', file=sys.stderr)
docs: Perform device authentication and print credentials.