Having just got V_ARMED working as I want I notice that when a node presents itself and children that the V_ARMED setting seems to be disabled by default.
So a node with child sensor V_TRIPPED and V_ARMED will only display V_TRIPPED as default. You have to go through the menus to enable V_ARMED and that could be an issue for many people who are new to this.
Once found and enabled though, it does do what I want
That sounds promising - I was thinking of having a 'beacon' node in the car that would turn on outside lights whenever I got within range and it was dark outside.
I could also have the controller send any warning messages (like alarm activation) to the car.