Patent ID: 7869392

Claim:
A system comprising: a server comprising a first wireless communication port; at least one fob, each of said at least one fob comprising a second wireless communication port adapted to communicate with the first wireless communication port of said server; and at least one node different than said at least one fob, each of said at least one node being a sensor node or a device node and comprising a third wireless communication port adapted to send information to or receive information from the first wireless communication port of said server, wherein said server is adapted to determine if at least one of said at least one fob is out of range of wireless communication with said server and to responsively send predetermined information from the first wireless communication port of said server to at least one of said at least one node; wherein said at least one fob is a single fob which is adapted to periodically send a message from the second wireless communication port of said single fob to the first wireless communication port of said server; wherein said server is adapted to determine that said single fob is out of range by detecting whether said periodically sent message was received in a predetermined time interval; wherein said server further comprises a first non-wireless communication port; wherein said server is adapted to send alert messages responsive to receiving information from said at least one node on the first wireless communication port of said server; and wherein said server sends said alert messages to said single fob from the first wireless communication port of said server if said server receives said periodically sent message from the second wireless communication port of said single fob at the first wireless communication port of said server in said predetermined time interval and, otherwise, sends said alert messages from the first non-wireless communication port of said server.