Allows setting the Host device ID based on variables in the active variables using the same Handlebars syntax as other text expressions.
This adds a unique expression, and you can implement a counter based on a key such as UserID.
Implementing a Counter
The logic will keep track of all device ID's set with a "root" and will increment a counter depending on active sessions. If a session has been stopped, that session's counter will be re-used. The % character is used as a counter with the number of zero-lead digits equal to the number of % characters.
Example:
SetDeviceID="{{UserID}}%%"
Note that a ?Switch Expression can also be used in the SetDeviceID...
In the above example, the DeviceID will be based on the connecting UserID--so if a user has "JMARLOW" as a userid, the first three sessions will have a device ID or JMARLOW01, JMARLOW02 and JMARLOW03.
If any of the three sessions is stopped and the user starts another, that session's counter will be re-used rather than being JMARLOW04.
