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Q: FAQ: Polling at long intervals (Z-Stack, ZigBee)
Setting polling intervals longer than what is provided using the timer in 16 bit
If you would like to poll at a rate of more than the approximately 1/minute
configuration using the 16 bit MAC timer, you can try one of two things. The
first is to keep your own timer in the application and directly invoke the call
NwkPollReq() function to do a single poll. However the issue here is that the
parent (router) you are polling will probably have thrown the message away after
some time as it is limited to how long it buffers a message for a sleeping
child. The other option is that if the sleeping device’s application sends an
application level message asking for this information with application level
acknowledgements on, when it receives the ACK it will know the coordinator
received the message and it will expect to receive the application data response
in the near future. Since it is expecting the message you can call
NLME_SetPollRate(…) to change the poll rate temporarily until the expected
message is received (or some timeout occurs). After receiving this message you
can then call set poll rate again with a value of 0 to turn polling back off.
This way the device polls when you are expecting something and is quiescent the
rest of the time.
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