I know this is really of topic when it comes to what the sensors are suppose to be at. Never the less I couldn't help my self trying.
I do have some home automation at home using Homey Pro as the gateway/hub/controller, call it what you like.
Instelled both the MQTT server and client to the Homey device and added this as my mqtt broker in my dashboard.
When I run the mqtt client on node-red I see the topic from the door sensor coming in open:true/false depending on the status. Also when I check the log on the homey I see that it will receive the messge like
'received '{'ts': 'timestamp','open':false/true} on ' and then the topic from the sensor meraki/v1/mt/...... and so on'
I try to understand a way logic to use to trigger an activity when this happend, the easy first step is just basically turn on/off a light to get the flow to work in it's simplest way
Any ideas are welcome
//Mike