Wireless device pairing recovery

摘要

A refrigerated container system is described that includes a wireless personal area network (WPAN) including a plurality of wireless sensor nodes and a coordinator node through which the sensors provide sensor data to a controller for the refrigerated container system. The wireless sensors and the coordinator incorporate a variety of features that ensure efficient utilization of battery life by preventing unintended pairing of sensors with other WPANs and excessive sensor signal processing arising from door chatter. Finally, pairing is performed without pressing a button on the wireless door sensor. Instead, the sensor's magnetic reed switch is enlisted to detect swiping of a magnet by a user to enter a pairing mode.

主权项

1. A method for actively purging, without operator intervention, coordinator entries from a pairing table for a wireless sensor node incorporated into a wireless personal area network (WPAN), the method comprising the steps of:
registering a failure by the wireless sensor to connect to a first coordinator identified by a first coordinator entry in the pairing table; identifying at least a second coordinator entry, corresponding to a second coordinator, in the pairing table; determining that the wireless sensor has repeatedly failed to connect to the first coordinator a specified number of times over a time period; and purging the first coordinator entry from the pairing table in response to the identifying and determining steps.