async def async_added_to_hass(self):
    'Start unavailability tracking.'
    self._xiaomi_hub.callbacks[self._sid].append(self._add_push_data_job)
    self._async_track_unavailable()
Start unavailability tracking.
async def async_added_to_hass(self):
    
    self._xiaomi_hub.callbacks[self._sid].append(self._add_push_data_job)
    self._async_track_unavailable()