code: async def debug(self, conn_id, name, cmd_args):
          
  
  
          device = self._get_property(conn_id, 'device')
  
          retval = None
  
          try:
              if name == 'dump_state':
                  retval = device.dump_state()
              elif name == 'restore_state':
                  state = cmd_args['snapshot']
                  device.restore_state(state)
              elif name == 'load_scenario':
                  scenario = cmd_args['scenario']
                  device.load_metascenario(scenario)
              elif name == 'track_changes':
                  if cmd_args['enabled']:
                      device.state_history.enable()
                  else:
                      device.state_history.disable()
              elif name == 'dump_changes':
                  outpath = cmd_args['path']
                  device.state_history.dump(outpath)
              else:
                  reason = "Unknown command %s" % name
                  raise DeviceAdapterError(conn_id, 'debug {}'.format(name), reason)
          except Exception as exc:
              self._logger.exception("Error processing debug command %s: args=%s", name, cmd_args)
              reason = "Exception %s occurred during processing" % str(exc)
              raise DeviceAdapterError(conn_id, 'debug {}'.format(name), reason) from exc
  
          return retval
docs: Asynchronously complete a named debug command.
  
          The command name and arguments are passed to the underlying device adapter
          and interpreted there.
  
          Args:
              conn_id (int): A unique identifer that will refer to this connection
              name (string): the name of the debug command we want to invoke
              cmd_args (dict): any arguments that we want to send with this command.