async def async_added_to_hass(self) -> None:
    'Subscribe sensors events.'
    self.event.register_callback(self.update_callback)
    (await super().async_added_to_hass())
Subscribe sensors events.
async def async_added_to_hass(self) -> None:
    
    self.event.register_callback(self.update_callback)
    (await super().async_added_to_hass())