I don't know exactly how Danfoss will do this technically but there will be a possibility to establish a connection from the CS10 unit to the DPS webportal. So when the CS10 is connected to a mobile hotspot (e.g. from your smartphone) you have a connection to the webportal and you can get a remote service tool connection.
I totally agree that if you are connected to a "normal" WiFi network, you only need to go via VPN on it to have a service tool connection.
But if the machine is on the field and you have to do a diagnostic session on it, there is no "normal" WiFi network. In the most cases, the only possibility to do a internet connection is with the smartphone from the machine operator. And I think for this kind of functionality, Danfoss will charge something.
Regards,
FStelzer