code: async def start(self):
          
  
          self._loop.add_task(self._periodic_loop, name="periodic task for %s" % self._adapter.__class__.__name__,
                              parent=self._task)
  
          self._adapter.add_callback('on_scan', functools.partial(_on_scan, self._loop, self))
          self._adapter.add_callback('on_report', functools.partial(_on_report, self._loop, self))
          self._adapter.add_callback('on_trace', functools.partial(_on_trace, self._loop, self))
          self._adapter.add_callback('on_disconnect', functools.partial(_on_disconnect, self._loop, self))
docs: Start the device adapter.
  
          See :meth:`AbstractDeviceAdapter.start`.