Patent ID: 8604910
Filing Date: 2013-12-10
Classification: G06K,H04Q

Abstract:
1. A method of determining the status of a device, the method comprising: instructing by a network device each one of a plurality of radio frequency identification (“RFID”) devices to set one or more triggers for transmitting a message and to transmit a message upon detection of the occurrence of at least one of the set of one or more triggers by the corresponding one of the plurality of RFID devices, wherein instructing is performed by sending a command to each of the plurality of RFID devices, wherein sending a command includes sending one or more command packets, wherein the command specifies the one or more triggers; receiving by the network device a message transmitted from each of one or more of the plurality of RFID devices, the message comprising an Electronic Product Code (“EPC”) of a transmitting RFID device and a time stamp of the transmitting RFID device; and processing by the network device the messages according to a first rule set.