MQTTMaster: Just solved the problem! The key is using the correct node type. Should have asked sooner.

8 days ago · profile

Honestly, I'd go with Node-RED over Smartthings for flexibility. Keep in mind the tradeoff.

See also

• The best way to add battery-powered relays?
• Can I reliably expose my setup to the internet for remote access?
• Has anyone configured Matter devices integrated smoothly?