While digging around the internet I found two interesting Zigbee devices. They are called Panel Interface Modules or PIMs for interfacing preexisting wired security systems to HA.
I have no idea how they work or if they would even be compatible to ST but I figured I’d throw the idea out there.
Did it come with any instructions, diagrams or any technical information? Do you have digital copies of any of the information that can be shared here?
That would be really great if you could ditch the arduino/raspberrypi solution and use this instead (and way cheaper). What would we need to make it work? API?
I 've seen this with Rogers tech in toronto installing a new monitoring system and he used this device to take over an old wired system, makes it also possible to use old panel, sensors and siren. Hope this helps