I have an Ajax Systems alarm installation. Very happy with it, except the fact that it does not offer an API to connect to other systems.
It does however offer a smart plug that can be turned on or off depending on the armed mode. I am thinking about creating a workaround with that to let Homey know when the alarm is armed and unarmed.
My idea would be buying an Ajax smart plug and turning it on when the alarm is armed. The question is, what kind of smart device can I best plug in to that, to make the trigger to homey? Another smart plug? Any better or more creative ideas?