Hi there. Please note that only Classic SHM can be controlled via SmartApps currently. ST is planning on adding support for the new SHM in future.
You also need to configure the arming and disarming of SHM in there lock and unlock actions pages of LUM.
Also checking out this app (first post) for a way to supplement Classic SHM and adding additional features like beeping to your keypad. [RELEASE] Security System: Intruder Alert with Actions - Entry Delay, Exit Delay, Countdowns, Keypads, Lights, Alarms, Pictures/Cameras, Routines