Hi Matthias,
Most devices only function with a matching app. Gira and eNet are not present in the appstore.
You can request an app though, but if someone is going to create it, and if yes, when, is the big question.
Requesting support @ Gira is also an option.
@ Github, someone is busy with eNet to mqtt. And Homey Pro can talk mqtt.
The Gira Mobile Gate is needed however.