Abstract: A method and system for communicating state information for a target consumer electronic device in a home network to multiple controller devices, where the controller devices are each implementing a controller software element that conforms to a different protocol than the other. The target consumer electronic device is represented within the home network by a target software element. A first controller software element conforming to a data driven interaction (DDI) protocol accesses the target software element. A second controller software element conforming to a protocol different from the DDI protocol concurrently accesses the target software element. The first controller software element and the second controller software element cause a change in state of the consumer electronic device. The target software element notifies the first controller software element and the second controller software element of the state information for the target consumer electronic device.

Abstract: A traffic monitoring system includes many monitoring nodes (10) distributed along many roads. A sonar ranging module (12) in each node continually measures the height of vehicles (19) crossing thereunder with repeated sonar pulses. A microcontroller (14) contains suitable instructions for estimating the speed of the vehicle by assigning a length to the vehicle based on its measured height, and dividing the length by the crossing time that the vehicle took to cross under the sonar module. The speed information from each node is transmitted to a central station (11) via a communication link (17). In a second embodiment, each node (10A) includes a pair of sonar modules (12A) spaced apart along a road. These measures the height of the vehicle, as well as the traversal time it takes to travel between both sonar modules. The microcontroller (14A) contains suitable instructions for dividing the modules' separation distance by the traversal time to accurately calculate the speed of the vehicle.