Trying to figure out how to get my Zooz dimmer to fade-on when i press a button.
When I turn off my light, I use "start lowering", and it is nice and smooth and beautiful.
But if I use "set dimmer to brightness 50%", it is always instant-on. The option "With this fade" seems to do nothing. I would have expected that if i set that to 5, it would fade to 50% over 5 seconds. Changing the ramp rate of the device also does nothing.
Try an experiment on the device page for your Zooz dimmer (go to "Devices", then click/tap into the page for the Zooz). There, try manually executing the "Set Level" command with different options and see what happens. You'll see that it takes one or two parameters: the desired "destination" level and an optional transition time. "50%" and "5" (no quotes) as those two parameters should be what RM does when you tell it to set a dimmer to a certain level with a certain fade. If it doesn't respond correctly here, then it's either a quirk with the device or the driver, but in either case, RM won't be able to do it this way, either, since that's the kind of command it sends "under the hood" for these things.
The "Start lowering" action you've discovered is actually a bit different--it's something many Z-Wave and Zigbee dimmers/bulbs (and some others) support. It begins changing the dimmer level in the specified direction (up or down) until you issue the "stop changing" command. On the device page, these would be the "Start Level Change" and "Stop Level Change" commands. You can play with these to see how they work, but you'd almost always want to follow the "Start..." with a "Stop...". The exception is that some devices will "dim" all the way down to completely off if you don't stop a downward "Start Level Change" (I think most do, but Hue Bridge bulbs are a notable exception) and most will dim up to full brightness if you don't stop an upward "Start Level Change" (not aware of any exceptions here but I can't speak for all devices). So that's a workaround you could use to fade to "off" or to fade on to 100%, at least in many cases, if your devices doesn't otherwise respond to transition times. However, Hubitat doesn't let you specify a specific "destination level" here, so I'm not sure the above suggestion--which will run these commands--will get exactly what you want (no way to stop at 50%). Most of the time, you'd use these with something like a button device to start dimming on a push or hold and stop dimming on release, emulating with the buttons what a "real" dimmer would actually do with its attached lighting load.
I think the real issue here is either that your Zooz device doesn't support transition times (I had a ZEN27 that I think did but can't recall using any of their other in-wall products) or the driver or perhaps RM isn't passing it correctly to the device for some reason. At least if you play around with the device directly, you can rule out one of the latter things.
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