CC2530: Zigbee & Thread forum

Aakash Kumar

Part Number: CC2530
Other Parts Discussed in Thread: CC2538, Z-STACK

Hi,

We are running our lighting applications on cc2530 Zstack.

Wanted to know how NWK_MAX_DEVICE_LIST and MAX_NEIGHBOR_ENTRIES config will affect the network and application functioning.
Currently we have set NWK_MAX_DEVICE_LIST=5 and MAX_NEIGHBOR_ENTRIES=8. We did it due to memory constrains.

Typically real life scenario is deployment of 5 to up to 30 node in one network in area of 20-40 meter radius in a floor.
What will happen / How network will function in following scenario-

Only these nodes are deployed in a network with count of 5-25 nodes in a network.
Small part of these nodes are deployed with larger part of normal nodes (that doesn't have these limitations), like 15 of these nodes and 50 of normal nodes.

over 1 year ago

0 YiKai Chen over 1 year ago

Guru 735515 points

If there is no heavy Zigbee network traffic, I see no problem in such deployment.

0 Ryan Brown1 over 1 year ago

TI__Guru**** 208217 points

Hi Aakash,

Here is the Optimizing Flash and RAM Usage of Z-Stack 3.0.2 for the CC2530 Device Application Report if not already referenced. The ZC trust center will have the greatest memory restrictions due to the Zigbee 3.0 trust center functionality and ZDSECMGR_TC_DEVICE_MAX. If you continue being worried about memory constraints, you may consider using a CC2538 for your ZC and the CC2530 for your ZR/ZED nodes.

Regards,
Ryan

0 Aakash Kumar over 1 year ago in reply to YiKai Chen

Prodigy 30 points

How much traffic is heavy traffic, As far I as know there is data exchange(attribute read write of typically INT16 and INT32) from nodes is around 5-10 per minute at max. Also sometimes we have to update the nodes .

What problem we will face if there is heavy traffic.

0 Ryan Brown1 over 1 year ago in reply to Aakash Kumar

TI__Guru**** 208217 points

It is difficult to quantify heavy traffic, and it is also dependent on other factors like channel noise, network configuration, and link quality between nodes, but consistently receiving multiple packets per second could be approaching excessive. You can review SWRA427 (keep in mind this was developed with an archived and modified version of Z-Stack) and SWRA650.

Regards,
Ryan

0 YiKai Chen over 1 year ago in reply to Aakash Kumar

Guru 735515 points

5-10 per minute at max per node sounds OK to me. If there is heavy traffic, the message might retry many times to deliver or could be lost.