Device_credetials_installer.py cannot be used

RE: Device_credetials_installer.py cannot be used

Carl Richard — Mon, 23 Mar 2026 12:58:04 GMT

Hi again!

And here is the solution. The device_credetials_installer is using hardware flow control (CTS/RTS) by default, as this is used on the interface of the Nordic DKs. This is deactivated in your configuration, so you will need to call the command with the hardware flow control deactivated as well, using the flag --rtscts-off. You can test with the following command:

device_credentials_installer --cmd-type=at --log-level=debug --port COM8 --rtscts-off

It should be enough to just add the flag to your original command as well.

Best regards,
Carl Richard

RE: Device_credetials_installer.py cannot be used

Carl Richard — Mon, 23 Mar 2026 12:52:37 GMT

Hi again!

This is indeed very strange, but I have managed to reproduce the issue here now. It seems to be related to the custom board and the FT232R chip. I will investigate further and try to find a solution!

Best regards,
Carl Richard

RE: Device_credetials_installer.py cannot be used

john.liu — Fri, 20 Mar 2026 15:10:19 GMT

Hi：

thanks for your help!

I use tools, it's good.Very strange!

Is it possible for Device_credetials_installer that RX cannot receive or TX did not add "\ r \ n" when sending!

RE: Device_credetials_installer.py cannot be used

Carl Richard — Fri, 20 Mar 2026 11:50:36 GMT

Hi again!

These logs indicate that the device isn't connected. What is the output if you call the following command: device_credentials_installer --cmd-type=at --log-level=debug -A ? This should output the different available COM ports, so please also try selecting the different ones and check the output.

Apologies for asking you to try out all these different commands. I'm just trying to figure out the issue here.

---

Regarding alternative methods for provisioning (registering) your devices for nRF Cloud you can check out the Provisioning Service, which is firmware based. We have a sample here that you can use.

Best regards,
Carl Richard

RE: Device_credetials_installer.py cannot be used

john.liu — Fri, 20 Mar 2026 10:38:13 GMT

Hi:

RE: Device_credetials_installer.py cannot be used

Carl Richard — Fri, 20 Mar 2026 09:38:25 GMT

Hi again!

It may be an issue with the script as you say. I will look into alternative ways to register your device.

In the meantime, could you try running the command with debug options enabled? Like this: device_credentials_installer --cmd-type=at --log-level=debug

Best regards,
Carl Richard

RE: Device_credetials_installer.py cannot be used

john.liu — Thu, 19 Mar 2026 15:13:59 GMT

Hi:

Thanks!

I tested the firmware you provided, but it still has the same issue.

(I think it may be an issue with the Device_credetials_installer, but I recently installed it.)

Or is there a simpler way for me to register my device to the nordic Cloud?

RE: Device_credetials_installer.py cannot be used

Carl Richard — Thu, 19 Mar 2026 13:03:08 GMT

Hi again!

Ok. Could you try to flash this application to your device and test again? It's a version of the at_client that I've built here.

devzone.nordicsemi.com/.../2072.merged.hex

Best regards,
Carl Richard

RE: Device_credetials_installer.py cannot be used

john.liu — Thu, 19 Mar 2026 12:24:51 GMT

Hi：

I just modified the overlay file.

RE: Device_credetials_installer.py cannot be used

Carl Richard — Thu, 19 Mar 2026 09:27:48 GMT

Hi again!

Thank you. Do you have custom board files as well, or are you only using this overlay? Please share the board files if you have them.

Just out of curiosity, please try the following command as well: device_credentials_installer --cmd-type=at --port COM8 --dsrdtr

Best regards,
Carl Richard

RE: Device_credetials_installer.py cannot be used

john.liu — Wed, 18 Mar 2026 14:24:16 GMT

Hi:

I can use my tools to test it. Like this:

I am using the at_cient example.

This is a file that modifies the tx and rx of UART0.

devzone.nordicsemi.com/.../0211.nrf9151dk_5F00_nrf9151_5F00_ns.overlay

RE: Device_credetials_installer.py cannot be used

Carl Richard — Wed, 18 Mar 2026 11:45:23 GMT

Hi again!

Thank you. That makes sense! Your tools also seems to be of the correct version. When did you install nrfcloud-utils?

I have not managed to reproduce the issue here. Could you try to reflash the device with the at_client sample before running the following command instead: device_credentials_installer --cmd-type=at --port COM8? Please paste and share any logs here.

Best regards,
Carl Richard

RE: Device_credetials_installer.py cannot be used

john.liu — Tue, 17 Mar 2026 15:52:14 GMT

HI:
Thanks for your help!!!
Just jlink's COM3, but actually using COM8's serial port tool to communicate with NRF9151.
I don't know how to check the version of nrfcloud_util,I installed it using "pip3 install nrfcloud-utils".

RE: Device_credetials_installer.py cannot be used

Carl Richard — Mon, 16 Mar 2026 14:45:07 GMT

Hi John!

Thanks for reaching out. From your screenshot it seems like your Nordic device is connected to COM3, but you are specifying COM8 in the call to device_credentials_installer. May I ask why?

Also, which version of nrfutil and nrfcloud_utils do you have?

Best regards,
Carl Richard