Another point I'm thinking about: What are your thoughts regarding security?
Is it a good idea to use an open protocol sensor to monitor open/closed doors?

It's extremely easy to check if your door or window is open... so I have my doubts right now..

Does it support Open AND Close? The Kerui seem to be rather expensive Otherwise I found which were posted in the video above, they work too I assume. https://de.aliexpress.com/item/5pcs-433MHz-EV1527-two-way-wireless-intelligent-door-window-sensor-APP-control-wifi-door-detector-for/32642367411.html ...

Hi there,

I'm also looking for a cheap and compact door sensor that I can use with the RFXTRX433 - as there a lot of uncertainties and unsupported devices in the discussion; can anyone suggest one from Aliexpress that supports Open/Close signals?

Thanks a lot for your help