code: async def do_work_async(self):
          
          if self._shutdown:
              return False
          if not await self.client_ready_async():
              return True
          return await self._client_run_async()
docs: Run a single connection iteration asynchronously.
          This will return `True` if the connection is still open
          and ready to be used for further work, or `False` if it needs
          to be shut down.
  
          :rtype: bool
          :raises: TimeoutError or ~uamqp.errors.ClientTimeout if CBS authentication timeout reached.