Zigbee SEDs fail to reconnect after mains power failure

RE: Zigbee SEDs fail to reconnect after mains power failure

Marte Myrvold — Tue, 27 Dec 2022 10:02:44 GMT

Hi,

[quote user="mytzyiay"]It seems like reported bugs in the ZBOSS stack have, so far, not gone anywhere.[/quote]

Which bugs are you referring to?

[quote user="mytzyiay"]1) Inform the app when there is periodic Zigbee activity, so that we can re-arm a watchdog timer. If the switch falls off the network for an extended period of time, reset the device.[/quote]

I am not aware of any good ways to do this, since a lot of the stack logic is handled internally. You can try to use the ZBOSS thread in some way (see zboss_thread()), although I would not recommend making changes to any of the library files.

[quote user="mytzyiay"]2) Nordic can request ZOI Guest access so that we can see the source code and track down the bugs ourselves[/quote]

Please contact RSM regarding this.

Best regards,

Marte

RE: Zigbee SEDs fail to reconnect after mains power failure

mytzyiay — Thu, 22 Dec 2022 19:23:52 GMT

I am already calling user_input_indicate() on every button press. I saw this in the Zigbee samples and I followed their lead.

It seems to work correctly in the sense that it wakes up the ZBOSS stack during normal (non outage) conditions. But I'm not sure it is properly waking the stack after an outage.

It seems like reported bugs in the ZBOSS stack have, so far, not gone anywhere. So I could see two other possible alternatives here:

1) Inform the app when there is periodic Zigbee activity, so that we can re-arm a watchdog timer. If the switch falls off the network for an extended period of time, reset the device.

2) Nordic can request ZOI Guest access so that we can see the source code and track down the bugs ourselves

What do you think?

RE: Zigbee SEDs fail to reconnect after mains power failure

Marte Myrvold — Thu, 22 Dec 2022 18:26:05 GMT

Hi,

Please try to get a sniffer log from when the outage occurs if possible.

The SEDs will retry for a finite time, with longer and longer interval between each successive retry. This procedure can be restarted by calling user_input_indicate(). You will have to implement the logic for this in your application, for example that pressing a button, or holding a button down for a period of time, will call user_input_indicate().

Best regards,

Marte

RE: Zigbee SEDs fail to reconnect after mains power failure

mytzyiay — Tue, 20 Dec 2022 18:52:19 GMT

I have a sniffer log from when the power returned, but not when the outage occurred. It doesn't show any traffic from the "stuck" SEDs.

> The SEDs should start looking for a new parent when they cannot reach their parent. If they are unable to reach any, then they will not be able to rejoin the network

Is there logic that causes them to retry a while after they've failed to find a new parent node? Any way to adjust this behavior or force a join reattempt on a timer?

In the case of a mains power failure, all possible parents can potentially be offline for hours. A tiny percentage of our end users may have a ZR on battery backup, but that isn't something we can count on.

RE: Zigbee SEDs fail to reconnect after mains power failure

Marte Myrvold — Mon, 19 Dec 2022 10:01:21 GMT

Hi,

Do you have a sniffer log when the mains power interruption happens? The SEDs should start looking for a new parent when they cannot reach their parent. If they are unable to reach any, then they will not be able to rejoin the network, which might be what is happening here. Are the SEDs affected by this out of range of any possible parent, while the other SEDs are in range?

Best regards,

Marte

RE: Zigbee SEDs fail to reconnect after mains power failure

Kenneth — Wed, 14 Dec 2022 14:19:47 GMT

Hello,

The person best fit to answer your questions are out of the office, we will look into it next week.

Kenneth