I've been slowly working on one, using Steve White's Iris Power Plug as a basis. I think the "power" value is reading correctly, but the voltage value displayed is way off (I have not bothered to work on it yet though). I have been trying to work an "update" mechanism into the driver so people can keep the latest driver on hand (per This Thread).
The fingerprint I am using is:
fingerprint profileId: "0104", inClusters: "0000,0003,0004,0005,0006,0009,0B04,0B05", outClusters: "0019", manufacturer: "Securifi Ltd.Gd�# /f�", model: "outlet", deviceJoinName: "Outlet"