@wutu Now I have put down the Device by hand in config.
Now while starting I get this announcement:
15:08:17.509 [pimatic-ultrasonic] Error init HC-SR04 ultrasonic sensor
15:08:17.518 [pimatic-ultrasonic] [Error: unknown hardware: "BCM2835"]
15:08:17.687 [pimatic] Invalid config of device "wasserstand": Property "#/echo" Should have type object, was: integer in /echo
15:08:17.694 [pimatic] Error loading device "wasserstand": please call `usonic.init()` first