code: def play_sound(self, subject='Find My iPhone Alert'):
          
          data = json.dumps({
              'device': self.content['id'],
              'subject': subject,
              'clientContext': {
                  'fmly': True
              }
          })
          self.session.post(
              self.sound_url,
              params=self.params,
              data=data
          )
docs: Send a request to the device to play a sound.
  
          It's possible to pass a custom message by changing the `subject`.