Oh man, you beat me to it. 
Should have checked this thread before I put something together. My device handler is in my github (https://github.com/erocm123/SmartThingsPublic/tree/master/devicetypes/erocm123/homeseer-hs-wd100-dimmer-switch.src) if anyone is interested, but it isn’t as tested/polished as @Darwin 's. It has the button handling code from the Remotec button device handler I created a little while ago.
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