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For non-native smart devices, this type of automation/monitoring could be implemented with a combination of "Bond Home" and Home Bridge (running on a raspberry pi). I have had success with connecting several dumb fans and lights and accessing them via the native HomeKit interface. Even the native iOS home kit automations work with it as well.

I haven't tried it with a garage door, but I do see the home bridge community has built some plugins with some garage doors.

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If you want to control non-smart wireless home appliances, you can actually make the Raspberry Pi GPIO do it without the Bond Home.[1] It’s a huge hack, to put it lightly.

I don’t think the OP is actually doing any sort of control though. I personally would recommend a Zigbee door sensor as part of a Zigbee + Home Assistant (open source) automation system which gives you the flexibility of not having to run wires and not having to write code to configure the automations.

[1] https://riveducha.onfabrica.com/raspberry-pi-gpio-send-radio...

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