CC2530: Prevent ZED from changing parent

Peter Drozda

Part Number: CC2530
Other Parts Discussed in Thread: Z-STACK

Hi guys,

is there any way how to force the z-stack (3.0.2) not to change parent of ZED?

E.g. Aqara sensors are known to have such behavior. They never change parent. Once they join the network they stick with the parent they found, even if they are moved out of the signal coverage..

I know Aqara is not using TI ZStack and I know it is not to be considered as standard behavior in accordance with ZigBee specification, but in some cases it is quite useful if you have stable network.

So I was wondering, if there is any way how to do that with ZStack.. E.g. to set number of missed ACK or some link quality thresholds etc.. whatever is taken into account when change of parent is triggered from the ZED's perspective..

Thank you.

over 3 years ago

+1 Ryan Brown1 over 3 years ago

TI__Guru**** 221947 points

Hi Peter,

The first thing you could try is access f8wConfig.cfg and set MAX_POLL_FAILURE_RETRIES to its max value of 255 (assigned to a uint8) along with increasing the POLL_RATE to allow for the longest down-time between parent and child before the orphan procedure begins. Another option to consider is removing bdb_parentLost from ZDO_SyncIndicationCB, however this has not been further evaluated so it would need to be tested for any erratic behavior.

Regards,
Ryan

0 Peter Drozda over 3 years ago in reply to Ryan Brown1

Prodigy 140 points

Thanks Ryan! Exactly the tips I needed :)

0 Peter Drozda over 3 years ago in reply to Peter Drozda

Prodigy 140 points

Maybe one more related question.. If unsuccessful polling is the main reason to change the parent, does that imply, that ZED which does not poll - has poll rate = 0 never changes the parent? E.g. if it only occasionally send some report about temperature or contact etc..

0 Ryan Brown1 over 3 years ago in reply to Peter Drozda

TI__Guru**** 221947 points

If the parent fails to acknowledge the reports being sent then this will also cause a loss in synchronization with the child after NWK_MAX_DATA_RETRIES attempts. If the ZED does not send any data within NWK_END_DEV_TIMEOUT_DEFAULT then it will be aged out by the parent and have to rejoin the network. NLME_SetPollRate(1) can be used to complete a one-time poll.

Regards,
Ryan

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CC2530: Prevent ZED from changing parent