Nuki Smart Lock + Nuki Bridge + Google Nest Hub.
Open the door trough the touchscreen of the Google Nest Hub. (Without pin)
Open the door trough the touchscreen of the Google Nest Hub, without pin. As you need to physically touch the Google Nest Hub, this should be secure.
It would be awesome to let someone enter with just a simple push on the Google Nest Hub (and way more secure than saying the pin code that someone could listen to).
Someone rings the doorbell and you would be able to open the door without opening an app, just using the Google Nest Hub.