I have successfully integrated MyStrom WiFi socket switches with my HA instance.
I have not, however, found out how to integrate the MyStrom WiFi motion sensor.
I have added the motion sensor to the MyStrom dashboard and it is working.
But the sensor does not appear in HA as an entity or device, and the option to add to HomeKit does not present itself, since the device is not seen by HA.
Suggestions welcome. I contacted MyStrom but their support is less than helpful.
I am assuming part of the solution involves an entry on config yaml, and from what I have read it may be necessary to install and configure Mosquitto.