Looks like I forgot to add that the Slurper DNI should be your RasPi mac.
Try it and let me know. I’ll update the instructions
You need a device created in SmartThings to represent the Raspberry Pi. The device should have a Device Network Id (DNI) that matches the MAC address of the Raspberry Pi. It should be all uppercase and without any octet separators (e.g.000A959D6816).