I have built an alarm system with ZigBee sensors and zigbee2mqtt stick. In Node-RED I am using the built-in MQTT nodes only. I have not installed any contrib node for that purpose. You just need to understand how zigbee2mqtt structures topics and commands. It is pretty easy and the documentation is awesome. I have modified the Z2M admin panel that is shared in the flow library to be a dashboard but not using it really. All alerting and activation is performed via Telegram and works solid.
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