SpaceLYnk, HomeLYnk/Wiser for KNX are local systems; as such, they require local port forwarding and a static external IP address or DNS entry. eg spacelynk.example.com
They communicate through HTTPS, so they will need to be forwarded through the modem to port 443 internal with an arbitrary external port; we’ve used 65533, although it can be any unreserved and unused port.
Because the SpaceLYnk, HomeLYnk/Wiser for KNX communicate via HTTPS, communications are end-to-end encrypted.