Comcast is turning millions of its routers into motion detectors

Xfinity gateways XB7 and newer can now act as motion sensors in your home. | Image: Comcast Comcast is bringing Wi-Fi motion sensing to millions of routers that are already in customers' homes, turning the devices into activity monitors. A new update to the Xfinity Internet app, arriving today, August 18th, enables the feature on compatible Xfinity routers at no extra cost. Announced as part of its new Xfinity Shield service, WiFi Motion can monitor activity in your home and send you…