Hi,
I spend few day trying to understand the issue with the provided sample (followed the tutorial) in the IoT fundamental lecture for the MQTT protocole. Then, I tried the solution sample (lesson4_Exercise2_solution) which gave me the same error regarding the certificate provision and modem crashing. You may find below the serial terminal feedback. I use SDK v2.6.0 with the toolchain v2.7.0. Before sharing my problem, I tested the exercise 1, which works perfectly (no sim card issue). I also downloaded the certificate and renamed it just has the tutorial explains.
*** Booting nRF Connect SDK 3758bcbfa5cd ***
[00:00:00.290,924] <inf> Lesson4_Exercise2: Initializing modem library
[00:00:00.580,139] <err> nrf_modem: Modem has crashed, reason 0x4, PC: 0xecb64
[00:00:00.580,200] <inf> Lesson4_Exercise2: mismatch
[00:00:00.580,200] <inf> Lesson4_Exercise2: Provisioning certificates
[00:00:00.580,230] <wrn> modem_key_mgmt: Failed to retrieve CMEE status, err -1
[00:00:00.580,230] <err> Lesson4_Exercise2: Failed to provision CA certificate: -1
[00:00:00.580,230] <err> Lesson4_Exercise2: Failed to provision certificates
[00:00:00.580,261] <err> Lesson4_Exercise2: Failed to configure the modem
Board: nRF9160-DK
Thanks in advance.
Best regards
David