code: def start(self, device_uuid):
          
  
          status_code, _, session = self.http_client.post('/sync/start',
                                                          body=None,
                                                          headers=self.build_headers(device_uuid))
  
          return None if status_code == 204 else session
docs: Start synchronization flow
  
          Starts a new synchronization session.
          This is the first endpoint to call, in order to start a new synchronization session.
  
          :calls: ``post /sync/start``
          :param string device_uuid: Device's UUID for which to perform synchronization.
          :return: Dictionary that support attribute-style access and represents newely created Synchronization Session or None.
          :rtype: dict