Lutron’s DIY Caséta line has come a long way since it launched in 2014 with a single in-wall dimmer and a plug-in lamp dimmer. It was the first smart lighting product to put professional grade lighting control in reach of anyone with a screwdriver. The range now covers smart dimmers, switches and plugs for indoors and out, and the Caseta Smart Hub is what ties them together. So what does the hub actually do, and when do you need one?