Access Server with LTE Router PSK?

sallos

Hi,

i have this LTE Router https://www.geneko.rs/en/products/m2m-products-and-solutions/gwg-3g-4g-gateway/gwg-gateway/features-20.html i want to make this connection to my server.

But the Router need a CA Certificate who kan i find this?
Or i can use a PSK. But i dont find PSK in the Access Server or in the Doks.

Or is the Access Server not the right solution? Do I have to use the openvpn server?

My goal is to connect multiple routers with my server. At the LTE router are PLC controls.

I hope someone can help me

Thanks