No actions on Surface Hub without calling home?

Hi,

We did some analyzes what Surface Hub does on the network, and got a bit surprised that when ever I change the menu on the settings, the device sent something back to Microsoft. Or that is how it looks:

CONNECT cxcs.microsoft.net:443 HTTP/1.0
Host: cxcs.microsoft.net:443
Content-Length: 0
Proxy-Connection: Keep-Alive
Pragma: no-cache

This is happening when ever I change the menu. 

Only what I could hope is, that in one day, the PG add a user-agent to that traffic from these devices. At the moment that is empty, so it is very hard to follow the traffic from these devices 😞