docs: def loadSessions(self, callback, bare_jid, device_ids):
          """
          Return a dict containing the session for each device id. By default, this method
          calls loadSession for each device id.
          """
  
          if self.is_async:
              self.__loadSessionsAsync(callback, bare_jid, device_ids, {})
          else:
              return self.__loadSessionsSync(bare_jid, device_ids)