CC2538: How poll rate and NWK_END_DEVICE_LEAVE_TIMEOUT work together?

Lei Jin

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

Hi,

I wanna end device to rejoin the ZC after power-off/on, so I set NWK_END_DEVICE_LEAVE_TIMEOUT to 1 or 0. Upon observation, ZED powered on and join the ZC successfully. However, after a few seconds, ZC sends out Leave Request and ZED responses which causes ZED keeping leave and rejoin. The following snippet states that poll rate on ZED is slower than this will not receive the leave request. For example, I set poll rate on ZED to 15s by calling NLME_SetPollRate(15000) right after successful binding. My understanding is that if leave timeout is 10s, calling NLME_SetPollRate(15000) on ZED to reset poll rate to 15s, ZC wont send out Leave Request, right? The attached is my trace and it's telling it did not work as expected.

//Timeout after which an EndDevice will be removed from from the indirect MAC messages queue
   // NOTE: End devices which poll rate is slower than this will not receive the leave request
#if !defined ( NWK_END_DEVICE_LEAVE_TIMEOUT )   
  #define NWK_END_DEVICE_LEAVE_TIMEOUT 9  
#endif

over 7 years ago

0 YiKai Chen over 7 years ago

Guru 735685 points

Couldn’t understand your question well. Can you elaborate what you mean to achieve?

0 Lei Jin over 7 years ago in reply to YiKai Chen

Expert 1530 points

Sorry, the attachment wasn't there. The issue is that ZED rejoins ZC after power-of and on. However, ZC keeps sending out Leave Request after success of rejoining, ZED sends Leave response upon request and leave. Leave and rejoin repeat for ever. We want to stop sending Leave Request from ZC.

I changed the following on ZC, and poll rate on ZED to 15s by calling NLME_SetPollRate(15000). However, it did not work as expected as attached. Also, poll rate was set to 15s but it wasn't 15s.pollrate_leave_timeout.rar

#define NWK_END_DEVICE_LEAVE_TIMEOUT 0

0 YiKai Chen over 7 years ago in reply to Lei Jin

Guru 735685 points

I don't think you can fix the issue in this way. Can you elaborate which z-stack version and example you use to test this and see the issue?

0 Lei Jin over 7 years ago in reply to YiKai Chen

Expert 1530 points

Now is 3.0.1, and samplesw as base with our own app, we just tried to merge from 2.x to 3.0.1. The behavior of 3.0.1 is different from 2.x.

0 YiKai Chen over 7 years ago in reply to Lei Jin

Guru 735685 points

Do you run coordinator with z-stack 3.0.1 and zed with z-stack home 1.2.2a?

0 Lei Jin over 7 years ago in reply to YiKai Chen

Expert 1530 points

Both ZC and HA ZED are based on 3.0.1, not sure what ha version from 3.0.1 package though.

0 YiKai Chen over 7 years ago in reply to Lei Jin

Guru 735685 points

Have do patches to your code according to Zigbee Known Issues and Proposed Fixes?

0 Lei Jin over 7 years ago in reply to YiKai Chen

Expert 1530 points

No patch applied on our 3.0.1. Good to know and will take trial on this patch to see if it happens again.

Thx!

0 Lei Jin over 7 years ago in reply to YiKai Chen

Expert 1530 points

BTW, is this fix will stop sending Leave Request? What causes ZC to keep sending out Leave Request?

0 YiKai Chen over 7 years ago in reply to Lei Jin

Guru 735685 points

I am not sure which case causes your trouble. I suggest you to patch all of the patches in the link.

0 Ryan Brown1 over 7 years ago

TI__Guru**** 216717 points

Hi Lei,

The ZED POLL_RATE should be much shorter than the ZC's NWK_END_DEV_TIMEOUT_DEFAULT so that the child is not aged out by the parent. NWK_END_DEVICE_LEAVE_TIMEOUT should be greater than NWK_END_DEV_TIMEOUT_DEFAULT to allow a period for which leave requests can be send before a ZED is removed from the indirect MAC message queue. Please evaluate with the default values. Default POLL_RATE is defined in f8wConfig.cfg

Regards,
Ryan

0 Lei Jin over 7 years ago in reply to Ryan Brown1

Expert 1530 points

Thanks Ryan. But I have another question after looking at trace, is it possible to disable sending End Device Timeout Request on ZED? This request is new in 3.0.1 and we don't want to send out timeout request from ZED.

Thanks

Lei

0 YiKai Chen over 7 years ago in reply to Lei Jin

Guru 735685 points

I don't see my device would send End Device Timeout Request. Which example do you test and see this End Device Timeout Request?

0 Lei Jin over 7 years ago in reply to YiKai Chen

Expert 1530 points

it is samplesw.

0 YiKai Chen over 7 years ago in reply to Lei Jin

Guru 735685 points

I suppose it is sent by NLME_SendEndDevTimeoutReq in ZDApp_AnnounceNewAddress and you can try to remove it.

0 Lei Jin over 7 years ago in reply to YiKai Chen

Expert 1530 points

YiKai,

Yes, you maybe right. I found out that this request was sent out right after device announcement. I am also guessing that's where the request is sent, will take a trial on this.

Thanks,

Lei

0 Lei Jin over 7 years ago in reply to Lei Jin

Expert 1530 points

YiKai,

I tried to disable timeout request and ZC still sends out Leave Request. My question is at what condition ZC will send out Leave Request? Is it related to Bdb_touchlink_target? All my questions in 3.0.1 is why ZC sends out Leave Request?

Thanks,
Lei

0 YiKai Chen over 7 years ago in reply to Lei Jin

Guru 735685 points

Have you do patches to your code according to Zigbee Known Issues and Proposed Fixes?

0 Lei Jin over 7 years ago in reply to YiKai Chen

Expert 1530 points

not yet, but you are right. Just narrowed down the issue and now it's time to do patch.

Thx
Lei

0 Ryan Brown1 over 7 years ago in reply to Lei Jin

TI__Guru**** 216717 points

Lei,

Child device management is a requirement of the Zigbee 3.0 per Section 3.6.10 of the Specification. It is also noted in the following TI White Paper: www.ti.com/.../swra615.pdf

You can maximize the value of NWK_END_DEV_TIMEOUT_DEFAULT to delay the leave request for as long as possible. You may also try altering zgNwkLeaveRequestAllowed or zgChildAgingEnable but this is honestly a mandatory feature of the Z-Stack 3.0 core which should not be disabled.

Regards,
Ryan

0 YiKai Chen over 7 years ago in reply to Lei Jin

Guru 735685 points

You should do the patches to test it first.

0 Lei Jin over 7 years ago in reply to Ryan Brown1

Expert 1530 points

Thanks Ryan! I am also looking for such document and will take look at this and see if we can make further progress about this issue.

Thanks,
Lei

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CC2538: How poll rate and NWK_END_DEVICE_LEAVE_TIMEOUT work together?