I have Gen 1 and can control them through an RPi.
If you wish to have a go at this here is the thread I posted that shows you how to set up your RPi and also a dimmer and outlet driver.
Once set up it does work well.
Here is the link to the thread which also points you out to another Smartthings thread which shows you how to set up the RPi.
This is not my work, I just followed it and converted the drivers from ST to HE.
Have a read and then you can decide if you want to give it a try.
Download the Hubitat app
