Zigbee Router leaves network after some seconds

[sjf]

Hi,

We have been working with a coordinator and a router device based on nRF52840 with nRF5_SDK_for_Thread_and_Zigbee_v4.0.0_dc7186b

Both devices are Zigbee 3.0 and implement Install Codes.

The Router is added and joins successfully to the network. Most of the times (8 out of 10), it ends up leaving the network after some seconds (15 more or less).

Find attached the related Wireshark log.

Is this related to TCLK? Which is the best way to avoid this?

Thanks in advance,

Santiago

log_router_issue_20200826.pcapng

[Marjeris Romero]

Hi,

Sorry for the late reply. Are both of the devices (coordinator and router) nRF52840 devices? Have you set install code on the router device? Have you added the information about the install code on the trust center on the coordinator and enabled the trust center install code policy?

Checklist for using install code:

• Set install code on the joining device, zb_secur_ic_set()
• Add information about the install code on the trust center, must only be done on the coordinator, zb_secur_ic_add()
• Set the trust center install code policy on the coordinator, zb_set_installcode_policy()

See the following table providing an overview of the related install code API macros: https://infocenter.nordicsemi.com/topic/sdk_tz_v4.0.0/using_zigbee__z_c_l.html?cp=7_7_0_3_4_3_1#security_nwk_code_security_api

Best regards,

Marjeris

[sjf]

Thanks for your reply. 

Yes, all this steps were followed. In fact the same process sometimes is successfully completed...

Could you see the attached Wireshark log?

By the way, in the link you provided about Install Codes it says that zb_secur_ic_remove IS NOT FOR THE COORDINATOR. Is that ok? 

[Marjeris Romero]

Hi,

Mmm yes I was able to see the wireshark log but it doesn't give me much information about why the Leave is happening, but I can try to compare with the snifferlogs when implementing IC in our CLI example to see if there is anything different that can give us a clue.

About the documentation for zb_secur_ic_remove() it looks like it's a counterpart function to zb_secur_ic_set(), but I can double check with the developers on monday.

Best regards,

Marjeris

[sjf]

Ok, thanks for your support.

We consider zb_secur_ic_remove()  as the counterpart of zb_secure_ic_add() on Coordinator only. In fact, documentation on source code seems to indicate that behavior.

Regards,

Santiago