First, to get the easiest thing out-of-the-way… Lutron uses its own proprietary protocol. It does not use zigbee of any kind. There’s no way to make it communicate directly with a smart things hub.
The home automation hubs that do communicate directly with Lutron devices have added a Lutron radio to their hub. This includes wink and staples connect. Smartthings chose not to do that.
There are multiple ways to get indirect integration, but all but one require that you also have the Lutron smartbridge, as you will actually be communicating with that device, which will then send the radio signals to the individual lutron switches. And the one that doesn’t require the smartbridge requires the staples connect to bridge in a similar way.
- simplest. Just use IFTTT integration as both smartthings and Lutron Caseta have a SmartThings service/channel.
Two) use staples connect as a bridge. There’s a thread about this in the forums.
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use harmony as a bridge. In this case smart things will talk to harmony, harmony will talk to the Lutron smartbridge, the Lutron smartbridge will talk to the switches.
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use a raspberry pi as a bridge.
So any of those can work as far as triggering a Lutron switch from a smartthings Smartapp. I don’t think any of them work in the other direction unless number 4 does.