I would install the API stuff here first. https://www.asus.com/ca-en/Single-Board-Computer/Tinker-Board/
Then, write some code to toggle and read I/O.
After that, as @rsiegel mentioned, it’s just a matter of integrating with the Cayenne MQTT Python library from GitHub - myDevicesIoT/Cayenne-MQTT-Python: Python Library for Cayenne MQTT API.
Check my Anova project for an easy 2 way MQTT example. Connecting the Anova Precision Cooker to Cayenne
I don’t own a Tinkerboard, or I’d do a tutorial. Maybe when you get this working, you will?
Cheers,
Craig