Zigbee Light Demo stops responding

[IanAber]

I programmed a NRF52840 Dongle with the example light switch code having changed the channel to 14 which is what my coordinator is on.

I then programmed a NRF52840DK with the example switch code and adjusted the search to look specifically for the dongle with the endpoint at 10. All the other compatible devices in my Zigbee network have endpoints set to 1.

I programmed my Smartthings hub to recognise the Nordic dongle as a simple light bulb.

I put the hub in discover mode and fire up the dongle and the DK which both connect.

The Smartthings hub recognises the dongle as a light and I can turn it on and off from the Smartthings app on my phone.

The NRF52840DK switch also finds the dongle and I can control the light on the dongle using the two buttons on the DK board. The Smartthings hub DOES NOT see the updates to the dongle made from the DK switch unless I manually refresh it, but that is another issue.

Everything is fine for a random amount of time varying between a few minutes and several hours up to just over a day on one occasion. Then the light (dongle) simply stops responding. It no longer responds to the Smartthings hub nor to the DK board switch. If I restart the switch it fails to find the light. Only when I restart the light does it work again.

Does anyone have any idea why this should be happening? Can anyone suggest how I can debug this situation?

[Jørgen Holmefjord]

I have forwarded your findings to the developers. They have started investigating and trying to reproduce the issue.

[Jørgen Holmefjord]

Our developers have analyzed the logs you provided, and confirm that the Zigbee stack is asserting. They know where the assert was called, but still don't know why it asserts. They have tried to reproduce the issue without success, and will now acquire SmartThings hub V2 to test with.

In the meantime, it would be of great help if you could provide information on the following points:

• Please provide as much details about the hub as you can collect (the hub name, version, revision, if possible to get also it's firmware version).
• Please provide as much information as possible about other devices in your zigbee network (do you have other routers or end devices, except light bulb demo and light switch demo?).
• Can you perform the test again and gather logs (this binary dump with <info> zboss: is perfect) AND wireshark logs from the same test run? Having both will help us correlate logs with network traffic.

[IanAber]

I have two SmartThings hubs in my environment in separate buildings. I will try the Nordic 52840DK in the second environment to see if it is truly the hub that is causing this or if it is some other device in the network. I will also try and grab a WireShark trace. It would be great if we could get some sort of time stamp on the debug log trace so we might be a ble to match it to the WireShark trace. Do you know if this is possible in Segger? My hubs are both Samsung SmartThings V2 hubs. I can provide access to my SmartThings account so you can see exactly what is in the network. I will need an email address to set up an account.

[IanAber]

I moved the nRF52840DK to my other environment which has an identical hub and it has been working for 24 hours without issue. This leads me to suspect some other device in the network is upsetting the ZBoss stack. I will move it back and run some tests by removing other Zigbee devices to try and nail down what is causing the failure. I will report back as I make progress. Thanks again for your help.

[IanAber]

I believe I have isolated the device that is causing the nRF52840 to fall over. It is an older Zigbee power socket from SmartThings. In the WireShark trace it is at source address of 0xa1d5. With that device out of th enetwork the nRF52840 worked for 24 hours but once it was reintroduced tot he network the nRF52840 fell over within a few minutes.