tgauchat
(ActionTiles.com co-founder Terry @ActionTiles; GitHub: @cosmicpuppy)
2
SmartThings has not documented / published the API for ADT Security Hub.
However, some research has indicated that it claims a brand new Capability “Security Hub”. If this is the case, then any SmartApp (custom, or WebCoRE, or ActionTiles, SmartRules, etc.) can subscribe to the Attributes … including a change in arm/disarm status.
In other words: This is worth exploring - but it would be an unofficial hack, even if it works.