I got the Grow humidity sensors together with a BME680 working on Cayenne, but don’t know exactly how I got it working. I can find out the next couple of days. At the moment I’m trying to get the BME680 (and later the Grow sensors) working with www.home-assistant.io, which runs on a Raspberry Pi. I installed the MQTT service on it and that works. I tried my luck with this topic but it doesn’t work yet. If you just have the Grow you might want to try this one, maybe it works. Good luck and have fun tinkering (btw do you also have a BME680?)