Link Wifi switch to a wifi contact sensor
* **Please explain your feature request in a one or two sentences.**
Be able to use a Wifi contact sensor to show the status of a door operated by a Sonoff dual


* **Is your feature request related to a problem? Please describe.**
No


* **Any particular eWeLink devices that this relates to?**
sonoff Dual switcha nd Sonoff DW2 contact sensor


* **Anything else?**


