Caséta uses a proprietary protocol, ClearConnect, for which you need Lutron's Smart Bridge to integrate with SmartThings or Hubitat, which don't "speak" ClearConect directly (it's local LAN integration on Hubitat or a cloud integration on SmartThings. Hubitat would be my recommendation here if you want to be happy; the Smart Bridge Pro works for either and is required for Hubitat, not the regular Smart Bridge).