ESPresso32 APP
You can use the scale simply to meassure the weight or use the special espresso modus whitch automaticaly starta timer on the first drop of espresso in the cup and autmatic stop if the espresso is done. Wich this feature you not have to stop the time manualy. Also you get a diagram how the espresso was flow into the cup.
The sourcedoce of this app and also for the ESP32 you can found on github.
https://github.com/epplerc/ESPresso32