cellular IOT fundamentals - lesson 1, exercise 1

RE: cellular IOT fundamentals - lesson 1, exercise 1

Benjamin — Thu, 19 Feb 2026 15:22:49 GMT

There you go! Those applications were occupying the COM port so nrfutil couldn't communicate with the DK.

RE: cellular IOT fundamentals - lesson 1, exercise 1

Vivek01 — Thu, 19 Feb 2026 15:09:53 GMT

Yes, The DK was connected with the system but after some time i disconnect & close the cellular monitor app and serial terminal app then after i run this device_credentials_installer command in command line and it go through successfully. i don't know it's because of those applications.

thanks

RE: cellular IOT fundamentals - lesson 1, exercise 1

Benjamin — Thu, 19 Feb 2026 08:34:31 GMT

Do you have the DK connected to your computer? You can confirm it is visible by running nrfutil device list on the command line.

RE: cellular IOT fundamentals - lesson 1, exercise 1

Vivek01 — Wed, 18 Feb 2026 23:59:21 GMT

hi,

i'm getting the error, when i registered the device with this command from 3. steps device_credentials_installer -d --ca *_ca.pem --ca-key *_prv.pem --coap --verify --delete

and because of this error this process didn't go through. can you suggest me to what to do for this error.

thanks

RE: cellular IOT fundamentals - lesson 1, exercise 1

Benjamin — Wed, 18 Feb 2026 11:47:01 GMT

Hi Vivek,

There seems to be some outdated material here. In the mean time you can follow the Local onboarding guide. You will need your nRF Cloud API key. You can find this here:

Best regards,
Benjamin

RE: cellular IOT fundamentals - lesson 1, exercise 1

Vivek01 — Wed, 18 Feb 2026 03:37:00 GMT