The Alarmdecoder component doesn’t allow the user to monitor the relay open and close messages. On some alarm panels you have to assign a virtual relay in the panel configuration to see motion while armed. Once you configure this in the panel you will see message over the port 10000 socket such as.
!REL:12,01,01
then later
!REL:12,01,00
The layout is !REL:<relay board address(12,13,14, or 15>,<relay#1 thru 4>,<01=relay closed, 00=relay open>
This would be great for use as a automation trigger to kick on lights in a room while the alarm is armed.