ZigBee networks ZigBee router operation
XBee/XBee-PRO® S2C ZigBee® RF Module
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Network watchdog
Use NW(Network Watchdog Timeout) for a powered router to periodically check for the presence of a
coordinator to verify network connectivity. The NW command specifies a timeout in minutes where
the router must receive communication from the coordinator or data collector. The following events
restart the network watchdog timer:
n RF data received from the coordinator
n RF data sent to the coordinator and an acknowledgment was received
n Many-to-one route request was received (from any device)
n Change the value of NW
If the watchdog timer expires (no valid data received for NW time), the router attempts to discover
the 64-bit address of the coordinator. If the router cannot discover the address, it records one
watchdog timeout. After three consecutive network watchdog timeouts expire (3 * NW) and the
coordinator has not responded to the address discovery attempts, the router leaves the network and
attempts to join a new network.
Anytime a router receives valid data from the coordinator or data collector, it clears the watchdog
timeouts counter and restarts the watchdog timer. You can set the watchdog timer (NW command) to
several days. The default setting for the network watchdog feature is disabled (NW defaults to 0). The
following flowchart illustrates network watchdog behavior:
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