code: def launch_app(self, timeout=10):
          
  
          def callback():
              """Callback function"""
              self.send_message({"type": TYPE_STATUS,
                                 "credentials": self.access_token,
                                 "expiresIn": self.expires})
  
          self.launch(callback_function=callback)
  
          # Need to wait for Spotify to be launched on Chromecast completely
          while not self.is_launched and timeout:
              time.sleep(1)
              timeout -= 1
  
          if not self.is_launched:
              raise LaunchError(
                  "Timeout when waiting for status response from Spotify app")
docs: Launch Spotify application.
  
          Will raise a LaunchError exception if there is no response from the
          Spotify app within timeout seconds.