I created a very basic link between Ajax and Homey by using an Ajax Smartplug and an Innr smartplug. The Ajax smart plug is automatically turned on when the alarm is armed and turned of when disarmed. I placed the Ajax plug in an Innr SP120 plug which measures the power consumed. When the Ajax plug is turned on, the Innr plug measures power and lets Homey know that the alarm is on. Vice versa for off.
That way I can turn on my camera’s when the alarm is armed.
For me it is sufficient for now. I hope to be able to use sensor data in the future.