RFXcom HA interface helps to manage wireless devices the home.
It can send and receive commands to wireless sensors and appliance receptacles (Oregon Scientific, KlikAanKlikUit and many more) and interfaces through serial, usb, and most importantly, TCP/IP to your Home Automation system.
By accident I recently discovered that the new receivers of KlikAanKlikUit (Kaku) can learn to obey multiple transmitter addresses. So you can have your motion detector commanding a lamp appliance directly, OR have the HA system command the same lamp via another address, OR have a manual remote control switch on that lamp. Still the HA is 'hearing' the motion detector and manual remote control activity, so you can distinguish between the sources that switched on the lamp. If twice a manual remote control command has been issued and no motion detector has been active, it might be time to replace those batteries in the motion detector...