Unable to Write TLS credential during JITP on custom nRF9160 board

Hello everyone

I created a custom board with reference to thingy:91 for the antenna part. The board is 50x50 mm in size.

I tested the board and there are no problems with the power supply, SIM, or sending AT commands. The peripherals work correctly and I tested my own program for UART communication. The LTE modem works, connecting after about a minute.

I use a J-Link EDU debugger for debugging.

The problem I am encountering is that I cannot insert the CA certificate into the nRF9160SiP. Once I have downloaded the JSON certificate from nRF Cloud, I use the Cellular Monitor application.


10:16:22.453 Updating CA certificate...
10:16:22.453 Unable to Write TLS credential
10:16:22.453 Updating client certificate...
10:16:22.453 Unable to Write TLS credential
10:16:22.453 Updating private key...
10:16:22.453 Unable to Write TLS credential
10:16:22.453 Certificate update completed

I can't proceed. Before uploading the file, I ran the AT+CFUN=4 command and verified that it was indeed in that state.

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  • I can connect to it via the nRF Serial Terminal and I use manually the AT commands, like the last comment.


    I tried nRF Cloud utilis but I'm stack on this part:

    C:\Users\shadi\OneDrive - Berner Fachhochschule\Desktop\utils\src\nrfcloud_utils>python device_credentials_installer.py --ca self_*_ca.pem --ca-key self_*_prv.pem --id-str nrf- --id-imei -s -d --verify --coap --port COM10

    INFO Disabling LTE and GNSS...
    ERROR Unable to communicate


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