Sadly, Samsung seem to be winding down their SmartThings Zigbee/ZWave home automation setup and it has always been quite painful using devices that weren’t officially supported. I’ve recently migrated my non-SmartThings native devices to Zigbee2MQTT, here’s how I did it:

• Purchase a SBC, in my case an OrangePi 4 running Armbian/Ubuntu – but a Raspberry Pi 4 is more mainstream. Set it up on your home network (perhaps you already have this running Home Assistant).
• Buy a supported zigbee adaptor. I strongly recommend the electrolama zzh adaptor (this requires firmware flashing post purchase, but this is straightforward).
• Install the adaptor, ideally via a USB extension cable.
• Install zigbee2mqtt.
  • The version of node installed wasn’t recent enough; I downloaded a newer version.
  • As the name suggests, you’ll have to set up an MQTT server, typically mosquitto to receive the status messages.
• Configure zigbee2mqtt / Home Assistant integration.
• Add your zigbee devices.
• Reconfigure your Home Assistant Automations etc if necessary.