CC2652P: how do a sleepy ZED and its parent (router or coordinator) exchange data in Z-Stack?

Zhiyong Li (FT)

Part Number: CC2652P

Hi,

The way ZED sending data out to its parent seems quite straightforward to me, but how a sleepy ZED receives data is not so obvious. I assume it is something similar to how it is done in TI-15.4 stack, as depicted in the following diagram:

in ZED syscfg file I see two options: minimal poll period and poll period. If sleepy ZED polls its parent at a fixed interval, I assume only the polling period is needed. What is the purpose of minimal poll period?

The other question is: if their is a pending data on parent node, will ZED receive the first pending data upon poll or won't actually receive the data until next poll as what happens in TI-15.4 stack?

Please advise, thanks in advance.

9 months ago

0 YiKai Chen 9 months ago

Guru 735475 points

Try to refer to dev.ti.com/.../node

+1 Ryan Brown1 9 months ago

TI__Guru**** 207157 points

Hi ZL,

Please see the Network Configurations section of the Z-Stack User's Guide, and you can also review the Z-Stack Overview. If the parent has packets available for the child then it will set the Frame Pending bit to 1 in the ACK of the child's Data Request. After keeping the radio receiver on to get this data, the child can send another Data Request immediately afterwards to determine whether any other frames are pending, which is known as the queued message poll period. This goes on until no more packets are available from the parent to the child, at which point the default poll period should resume. The data response poll period involves the time between when the child sends a message to its parent and sending a data request for the response. These are all limited by the minimal poll period, which prevents the child from sending too many polls quickly and consecutively, thus overloading its parent or the network channel.

Regards,
Ryan

0 Zhiyong Li (FT) 9 months ago in reply to Ryan Brown1

Expert 2690 points

Hi Ryan,

Thanks for the response, this clears up my confusion about the difference between minimal poll period and poll period.

Does the minimal poll period apply in TI-15.4 stack as well? When we tested it, if we generate a timed packet on collector node upon receiving a poll for data from a sensor node, that data packet will be received by sensor node 1 poll interval later.

Regards,

+1 Ryan Brown1 9 months ago in reply to Zhiyong Li (FT)

TI__Guru**** 207157 points

The same process does not apply to TI 15.4-Stack, you can review the Sensor and Controller SLA (Task 4) and the Example Applications section of the TI 15.4-Stack User's Guide for more information.

Regards,
Ryan

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CC2652P: how do a sleepy ZED and its parent (router or coordinator) exchange data in Z-Stack?