[NRF9151] Modem does not connect after SIM deactivate/reactivate

[Mlgr]

Hi,

I’m using the Thingy:91X board with the nRF9151 chip, modem firmware version 2.0.2, and SDK version 2.9.0.

We’re encountering a serious issue: the modem does not reconnect after the SIM has been deactivated and then reactivated.

I’ve tried:

• sys_reboot(SYS_REBOOT_COLD)

• Placing the modem offline (lte_lc_offline())

• Shutting down the modem library (nrf_modem_lib_shutdown())

• Forcing a hard reboot via the watchdog

None of these approaches has worked.

Do you have any suggestions for resolving this issue?

The only workaround so far (which isn’t acceptable) is to manually power the device off and on.

Regards,
Mathieu

[Mlgr]

Hi,

We are using non steering sims from Onomondo. 

The problem happens on all thingy91X devices, but not on Thingy91 with the same software.

Regards,

[dejans]

Hi,

Was there any specific reason for your SIM deactivation?
Can you provide more information on how you deactivated and reactivated SIM?

Best regards,
Dejan

[Mlgr]

At first, there was no wanted reason. It was caused by an Onomondo network issue. When the network went up again, our device did not connect back to the network.

But we are actually able to reproduce it, directly by deactivating it, then reactivating it in the Onomondo Ui (or using Onomondo API).

Once the Sim is deactivated, if we reactivate it, like 30 secondes later, we will not be able to reach the network, unless power cycling it. 

That's why, when we were still using the Thingy91 (with the nRF9160) we stopped feeding the watchdog when the connectivity was lost. But that seems to not do the trick with the nRF9151.