Nordic Border Router suddenly stopped working

[Brian (Geek)]

Hello,

I am currently using Nordic border router image as suggested by Google open thread group as i am using NRF5 SDK examples (sleepy mqttsn-publish example to be precise). The issue which i am facing after using the border router for 1 month continuously, suddenly my otbr has stopped acknowledging the packet send by the end device. 

I can see that the MQTT-SN gateway is acknowledging in Rpi system logs but that acknowledge is unable to reach my end device. Here is the system log for the same. please help  me .... 

Image of the issue  : 

- as you can see there is some conflict between wpan0 and wlan0 

Can anyone please help me ?

[Sigurd Hellesvik]

Hi Brian

Thank you for reporting this. I suspect it is a bug, and will inform our developers.

As a workaround, I suggest that you make the Border Router rerun dhcpcd after you detect the error.

Regards,
Sigurd Hellesvik

[Brian (Geek)]

Okay is that a dhcpcd error ? 

As i have less knowledge of networking , i would like to know will restarting dhcpd service  solve that ? 

[Sigurd Hellesvik]

Hi,

Can you point out how I can see this error from the attached log?

Do you have a log from the Thread device as well?

Regards,
Sigurd Hellesvik

[Brian (Geek)]

How to get that log ?

[Brian (Geek)]

I am even not able to run simple mqttsn default publisher example with default border router gateway available for test.

The thread device is not able to get gateway info as previously mentioned.

Here are the logs from the device:

<info> app_timer: RTC: initialized.

<info> app: Thread version   : OPENTHREAD/20191113-00534-gc6a258e3; NRF52840; Apr  5 2020 21:53:43

<info> app: Network name     : OpenThread

<info> app: Thread interface has been enabled.

<info> app: 802.15.4 Channel : 11

<info> app: 802.15.4 PAN ID  : 0xABCD

<info> app: Radio mode       : rx-off-when-idle

<warning> app_timer: RTC instance already initialized.

<info> app: State changed! Flags: 0x0103D21D Current role: 1



<info> app: State changed! Flags: 0x009533B7 Current role: 2



<info> app: State changed! Flags: 0x00000001 Current role: 2



<info> app: MQTT-SN event: Gateway discovery procedure has finished.



<info> app: MQTT-SN event: Gateway discovery result: 0x3.

[Sigurd Hellesvik]

Hi,

To avoid misunderstandings:
Can you point to the parts of your logs where the error happens?

Regards,
Sigurd Hellesvik

[Brian (Geek)]

Logs from RPi: 

I have four border router setup two at client side and two are currently with me and have been tested one by one. 

But suddenly all the border routers are having the same issue as mentioned in the log screenshot from above. I have even tried setting the static iaid for the wpan0 interface, which solves the above conflict I guess but the main issue of MQTTSN Gateway INFO packet is not getting received at end device is not getting resolved.

The same issue arrives when I press button 1 of DK board for gateway discovery the GW_INFO packet is not being recieved by DK board even with default SDK example and default Thread Border Router image. 

How can I solve this issue of end device not able to receive packet information ?

[Sigurd Hellesvik]

Hi,

Brian (Geek) said:

How can I solve this issue of end device not able to receive packet information ?

Can you provide a sniffer log for the thread network of this problem?

Regards,
Sigurd Hellesvik

[Brian (Geek)]

Currently it's started working fine.