Read a lot about how to controll a Webasto with an Arduino so i created two projects.
The first one is a simple on/off controller via W-Bus. It sould help other people in their own Webasto projects.
https://gitlab.com/jfk344/webastocontroller
The secound one is a LoRa Remote for the Webasto heater. It's a DIY solution for the Webasto Telestart.