Reference13r1:General/Devices-Registration

The Devices App URL can be configured here. This URL is used to establish a websocket connection to the Devices App and register there.

Example: wss://ap.innovaphone.com/innovaphone.com/devices/sysclients The Format is: wss://[dns-ap-platform]/[system domain]/devices/sysclients

If the connection between the device and the Devices App is up, there is "Up, X sessions" shown.
If there is someone browsing on the UI of the device through the Devices App, the session counter is increased.