It's not possible out of the box.
Francisco, did you find any way to do that? I need this feature too.
I am also interested in the ability to trigger an alarm after the tracker has not logged in after say 1 day. Was anyone able to get this working?
Mee too, anyone can help us?
Is it possible program an computed attribute to set alarm after "n" minutes last update, I´d like message when my device is offline after 10 minute per example...
Thanks