Does Zigbee NVRAM get erased if the Zigbee network is not starting with already present network parameters in Zigbee NVRAM?

RE: Does Zigbee NVRAM get erased if the Zigbee network is not starting with already present network parameters in Zigbee NVRAM?

Marte Myrvold — Wed, 05 Mar 2025 13:29:12 GMT

Hi Anusha,

Did you try manually starting network steering when ZB_BDB_SIGNAL_DEVICE_REBOOT is generated, and did it help the problem?

Best regards,
Marte

RE: Does Zigbee NVRAM get erased if the Zigbee network is not starting with already present network parameters in Zigbee NVRAM?

anusha_14 — Wed, 05 Mar 2025 12:03:19 GMT

Hi Marte,

The reason for restarting was because we found that pairing of certain Zigbee devices was not working if this step was not done.

Regards,

Anusha

RE: Does Zigbee NVRAM get erased if the Zigbee network is not starting with already present network parameters in Zigbee NVRAM?

Marte Myrvold — Mon, 17 Feb 2025 13:35:19 GMT

Hi Anusha,

Is there a particular reason you restart the device if ZB_BDB_SIGNAL_STEERING is not received within 30 seconds?

It is possible that the repeated restarts are causing some issues. I would recommend manually starting network steering upon receiving ZB_BDB_SIGNAL_DEVICE_REBOOT. You can find this in some of the examples in the SDK:

#define ZIGBEE_MANUAL_STEERING            ZB_FALSE                              /**< If set to 1 then device will not open the network after forming or reboot. */



case ZB_BDB_SIGNAL_DEVICE_REBOOT:
    // BDB initialization completed after device reboot, use NVRAM contents during initialization. Device joined/rejoined and started.
    if (status == RET_OK)
    {
        if (ZIGBEE_MANUAL_STEERING == ZB_FALSE)
        {
            NRF_LOG_INFO("Start network steering");
            comm_status = bdb_start_top_level_commissioning(ZB_BDB_NETWORK_STEERING);
            ZB_COMM_STATUS_CHECK(comm_status);
        }
        else
        {
            NRF_LOG_INFO("Coordinator restarted successfully");
        }
    }

Best regards,
Marte

RE: Does Zigbee NVRAM get erased if the Zigbee network is not starting with already present network parameters in Zigbee NVRAM?

anusha_14 — Thu, 13 Feb 2025 14:05:00 GMT

Hi Marte,

Thanks for your response.

The network data could be deleted if the device leaves the network due to wrong network configuration or receiving a leave command. - Since my application is a Zigbee coordinator application, the case of receiving a leave command would not apply as per my understanding. So, probably the network configuration is wrong then. If this is the case, I would like to understand if Softdevice deletes this network data. I would like to understand the complete flow of what happens when Zigbee network configuration is wrong.

I am afraid I cannot share the complete logs from the device as it has application specific information. However, I have attached the code snippet for zigbee handler and the corresponding log. Hope it helps.

devzone.nordicsemi.com/.../ZbHandlerCodeSnippet.c devzone.nordicsemi.com/.../AppLogWithZigbeeEvents.txt

Regards,

Anusha

RE: Does Zigbee NVRAM get erased if the Zigbee network is not starting with already present network parameters in Zigbee NVRAM?

Marte Myrvold — Thu, 13 Feb 2025 12:54:43 GMT

Hi Anusha,

You are correct that ZB_BDB_SIGNAL_DEVICE_FIRST_START is generated when there is no network configuration in NVRAM. The network data could be deleted if the device leaves the network due to wrong network configuration or receiving a leave command.

Please upload the complete log from the device.

Best regards,
Marte