Bridge 51 also maintains a list of service-providing devices connected to the bridge it and their capabilities and transmits it to the mobile device 31 so that the mobile device 31 is able to form the group(s) based on this information. In an alternative embodiment, bridge 51 forms the group(s) and transmits information about the group(s) and the devices in the group(s) to the mobile device 31. The lights 61 to 69 are smarter than the lights 11 to 19 of