NRF Cloud connection refused (-111) when using NB-IoT

[AdrianT]

Hi,

We have a working firmware that uses LTE-M for network connectivity to connect to NRF Cloud. But upon testing with NB-IoT configuration (CONFIG_LTE_NETWORK_MODE_NBIOT_GPS=y), we are getting error -111. See logs below.

[Pascal Hdz]

Hello,

Could you double check that the device ID is the same as the one in nRF Cloud?
Sometimes there is a mismatch that leads to that error.

Pascal. 

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[AdrianT]

Yes, the Device ID matches the logs and nrfcloud dashboard. We are using the same device but flashing a FW with NB-IoT only enabled.

We were able to make the device connect to nRF cloud successfully after a couple of hours of the device retrying to connect to NRF Cloud. Is there a better way to ensure that the device can easily connect after transitioning from a FW that uses LTE-M into NB-IoT? Thank you

[Pascal Hdz]

Ok, I would need to know more about other Kconfig variables you are enabling. Also, have you tried to delete the device and onboard it again using this new configuration? In case you used Provisioning service, please unclaim it also.

Did you based your application in one project from our samples or applications in the SDK? Have you tried to reproduce the issue with one of them? This would help me reproduce the issue on my side and help you better.

Pascal.

[AdrianT]

We have used nrf cloud multi service sample as a reference. Also not using the provisioning service.

I have tried deleting the device and re onboard it in nrf cloud. But still not getting refused connection.

Will try to use the base nrf cloud multi service sample with KConfig CONFIG_LTE_NETWORK_MODE_NBIOT_GPS=y set as the modification.

[AdrianT]

Same case happens with the multi service sample.

Also I noticed this warning log:

<wrn> nrf_modem_lib_netif: MTU query failed, error: -77, MTU: 0