Maximum value to be input to otLinkSetPollPeriod function as parameter

[Abhijith.Desai]

Hi,

Using windows 10 OS, and SES v5.40.

I am using nRF52833 device in my project along with nRF5_SDK_for_Thread_and Zigbee_v4.1.0_32ce5f8 SDK.

I am using openthread protocol and specifically otError otLinkSetPollPeriod( otInstance *aInstance, uint32_t aPollPeriod ) function to input the poll period.
Problem statement : the above said function is nothing but the communication poll period and i see from the documentation(https://openthread.io/reference/group/api-link-link) that it is a U32 variable which has max limit of 0x3FFFFFFF and min 10ms for its operation.
But if i run a test by inputting aPollPeriod to some higher value i can see that the value is somehow cutting down to 188s(approx. 3mins).
Ex : Test 1 : if i run with 60 sec(60000) as input i can see that the value of poll period is 60s(59999ms).
Ex : Test 2 : if i run with 200 sec(200000) as input i can see that the value of poll period is 188s(188676ms).
Ex : Test 2 : if i run with 350 sec(350000) as input i can see that the value of poll period is 188s(188676ms).

I am trying to test this with a inbuilt feature of our code that can measure the time and i have attached the debug information for further reference.

Questions:
1. what is the max value that can be input to this aPollPeriod (practically)?
2. Is 188s is the threshold for the pollperiod? 

Regards
Abhijith Desai

[Abhijith.Desai]

Hi,

Yes i am using 300s as child timeout value. but i tried to increase and still it seems poll period is clipped to 188s..

and in all the examples with SDK is see the poll period and child timeout value is very less (1000ms or less)sniff for 188s.pcapng

Fullscreen Debug log.txt Download

wake up in CSA is 4999ms
 Wake Up Application= 26994ms

Thread version   : OPENTHREAD/20191113-00534-gc6a258e3; NRF52833; Apr  5 2020 21:43:42
Network name     : OpenThread
802.15.4 Channel : 11
802.15.4 PAN ID  : 0xffff
Radio mode       : rx-on-when-idle
 Start joining ...

wake up in eosm is 40500ms
wake up in eosm is 0ms
wake up in eosm is 0ms
wake up in eosm is 3ms
wake up in eosm is 297ms
wake up in eosm is 0ms
wake up in eosm is 3ms
wake up in eosm is 297ms
wake up in eosm is 0ms
wake up in eosm is 3ms
wake up in eosm is 298ms
wake up in eosm is 0ms
wake up in eosm is 3ms
wake up in eosm is 297ms
wake up in eosm is 0ms
wake up in eosm is 4ms
wake up in eosm is 297ms
wake up in eosm is 0ms
wake up in eosm is 4ms
wake up in eosm is 298ms
wake up in eosm is 0ms
wake up in eosm is 3ms
wake up in eosm is 298ms
wake up in eosm is 0ms
wake up in eosm is 4ms
wake up in eosm is 297ms
wake up in eosm is 0ms
wake up in eosm is 4ms
wake up in eosm is 298ms
wake up in eosm is 0ms
wake up in eosm is 3ms
wake up in eosm is 298ms
wake up in eosm is 0ms
wake up in eosm is 3ms
wake up in eosm is 298ms
wake up in eosm is 0ms
wake up in eosm is 4ms
wake up in eosm is 297ms
wake up in eosm is 1ms
wake up in eosm is 3ms
wake up in eosm is 297ms
wake up in eosm is 0ms
wake up in eosm is 3ms
wake up in eosm is 297ms
wake up in eosm is 0ms
wake up in eosm is 3ms
wake up in eosm is 297ms
wake up in eosm is 0ms
wake up in eosm is 3ms
wake up in eosm is 8588ms
wake up in eosm is 1ms
wake up in eosm is 5ms
wake up in eosm is 0ms
wake up in eosm is 7ms
wake up in eosm is 0ms
wake up in eosm is 6ms
wake up in eosm is 0ms
wake up in eosm is 6ms
wake up in eosm is 0ms
wake up in eosm is 4ms
wake up in eosm is 113ms
wake up in eosm is 0ms
wake up in eosm is 0ms
wake up in eosm is 7ms
wake up in eosm is 0ms
wake up in eosm is 8ms
wake up in eosm is 0ms
wake up in eosm is 11ms
wake up in eosm is 0ms
wake up in eosm is 7ms
wake up in eosm is 0ms
wake up in eosm is 7ms
wake up in CSA is 54999ms
wake up in eosm is 34093ms
wake up in eosm is 0ms
wake up in eosm is 0ms
wake up in eosm is 5ms
wake up in eosm is 0ms
wake up in eosm is 6ms
wake up in eosm is 0ms
wake up in eosm is 6ms
wake up in eosm is 0ms
wake up in eosm is 7ms
wake up in eosm is 0ms
wake up in eosm is 6ms
wake up in eosm is 0ms
wake up in eosm is 6ms
wake up in eosm is 0ms
wake up in eosm is 7ms
wake up in eosm is 0ms
wake up in eosm is 7ms
wake up in eosm is 0ms
wake up in eosm is 6ms
wake up in eosm is 143ms
wake up in eosm is 1ms
wake up in eosm is 0ms
wake up in eosm is 0ms
wake up in eosm is 9ms
wake up in eosm is 10ms
wake up in eosm is 0ms
wake up in eosm is 0ms
wake up in eosm is 4ms
wake up in eosm is 52ms
wake up in eosm is 0ms
wake up in eosm is 0ms
wake up in eosm is 4ms
JoinerCallback error code: 0
Thread interface has been enabled.
wake up in eosm is 95ms
 IP Device State status 1

 OT_DEVICE_ROLE_DETACHED
Thread version : OPENTHREAD/20191113-00534-gc6a258e3; NRF52833; Apr  5 2020 21:43:42
Network name   : OpenThread
Channel        : 11
PAN ID         : 0xc5da
ExtendedAddress: c6 b0 7a bf 21 83 0b e9 
MasterKey      : ca fe ca fe ca fe ca fe ca fe ca fe ca fe ca fe 

wake up in eosm is 585ms
wake up in eosm is 1ms
wake up in eosm is 0ms
wake up in eosm is 4ms
wake up in eosm is 87ms
wake up in eosm is 653ms
wake up in eosm is 0ms
wake up in eosm is 0ms
wake up in eosm is 5ms
wake up in eosm is 19ms
 IP Device State status 2

 OT_DEVICE_ROLE_CHILD
Thread version : OPENTHREAD/20191113-00534-gc6a258e3; NRF52833; Apr  5 2020 21:43:42
Network name   : sva-test-client
Channel        : 11
PAN ID         : 0xc5da
ExtendedAddress: c6 b0 7a bf 21 83 0b e9 
MasterKey      : ca fe ca fe ca fe ca fe ca fe ca fe ca fe ca fe 

wake up in eosm is 99ms
wake up in eosm is 0ms
wake up in eosm is 0ms
wake up in eosm is 4ms

 meta_read:
 ctx_id = 6, meta_id = 2, value.val_type = 204, value.val.v_u = 536873024
wake up in eosm is 119ms
wake up in eosm is 0ms
wake up in eosm is 0ms
wake up in eosm is 4ms
Set new PollPeriod and disable RX when IDLE ...

 error 0
wake up in eosm is 8421ms
wake up in eosm is 0ms
 Wake Up Application= 2241ms

wake up in eosm is 6ms
wake up in eosm is 0ms
wake up in eosm is 10ms
 Wake Up Application= 59990ms

wake up in eosm is 81ms
 Wake Up Application= 59989ms

wake up in CSA is 40499ms
 Wake Up Application= 59990ms

wake up in CSA is 59999ms
 Wake Up Application= 59990ms

wake up in CSA is 59999ms
 Wake Up Application= 59990ms

wake up in CSA is 59999ms
 Wake Up Application= 59990ms

wake up in eosm is 188684ms
wake up in eosm is 0ms
wake up in eosm is 0ms
wake up in eosm is 7ms
wake up in eosm is 2ms
 Wake Up Application= 59989ms

wake up in CSA is 59999ms
 Wake Up Application= 59990ms

wake up in CSA is 59999ms
 Wake Up Application= 59990ms

wake up in CSA is 59999ms
 Wake Up Application= 59990ms

wake up in eosm is 188672ms
wake up in eosm is 0ms
wake up in eosm is 1ms
wake up in eosm is 5ms
wake up in eosm is 4ms
 Wake Up Application= 59990ms

wake up in CSA is 59999ms
 Wake Up Application= 59990ms

 

[Jørgen Holmefjord]

I'm not able to read the sniffer trace, as the packets are encrypted. I tried adding the masterkey from your log, but it did not seem to work. Do you have another masterkey?

[Abhijith.Desai]

ea88129601832ebc05dc06b68fe39420 could you try with this sniffer key.

Sorry for not providing it earlier..

[Jørgen Holmefjord]

I'm pretty sure you need to set the longer Child timeout before setting the Poll period in your application to be able to set the longer poll period correctly. In your screenshot you are calling otThreadSetChildTimeout() after otLinkSetPollPeriod().