Advice how to connect a BLGW to a KNX-systeem

Dear members,

In my apartment I have a Hager KNX-system installed for my lights. A touchdisplay is installed ion the wall in the livingroom. Alll the lightswitches work with RF. A few lamps are connected to KNX-dimmers and wall on/of sockets. Everything is working fine.

Now I want to go a bit further in home-automation. I want to control my Nest heating and off course my NL-products (Avant, V1, and a fwe BeoSounds).

Until now there is no connection with the internet to my router.

What kind of component do I need to complete my KNX-system to operate my B&O-stuff and my Nest products? I do not have a domovea-server.

The ethernetcable is already there, but how do I connect this cable to my KNX-system.

The next step will be a BLGW. Is the Beolink app appropriate for controlling everything?

Even blinds/curtains.

Please let me know your experience and your advice which component(s) I need.

Thanks in advance!

Gr.