nRF Connect VS Code Extention

RE: nRF Connect VS Code Extention

Kenneth — Mon, 27 Apr 2026 13:38:36 GMT

Hello again,

A few questions to ensure they understand the current issues correctly:

- Could you run "nrfutil device list --hotplug --log-level trace" again and see if you get the COM ports closing and opening every second? I'm interested in seeing the log from <USERHOME>/.nrfutil/logs/nrfutil-device.log regardless of the outcome.

- Could you also paste the output of "nrfutil device list --traits serialports"? And maybe rerun it 4-5 times.

- Also, how do you detect that the serial ports are being opended and closed? Could it be that are you seeing other symptoms that might be similar to open/close?

Thank you,
Kenneth

RE: nRF Connect VS Code Extention

Kenneth — Mon, 27 Apr 2026 12:47:17 GMT

Hello, I have forwarded your observation now.

Thank you,
Kenneth

RE: nRF Connect VS Code Extention

Emre Bayraktar — Fri, 24 Apr 2026 12:39:20 GMT

Hi Dejan,

I've found the reason for this problem while exploring the nrfUtil's features for my own application:

- nrfUtil have a list function to detect available J-Link devices which tries to open/close every possible com port on the computer. nRF VS Code extention probably run this command every second to detect device removal from computer. However, this feature causes to Quectel device's com ports to continously being open/close every second, which makes them unusuable.

RE: nRF Connect VS Code Extention

dejans — Tue, 14 Oct 2025 14:54:10 GMT

Hi Emre,

Can you send support log (Generate Support Information)?

Is Quectel device J-Link device?

Are drivers, J-Link OB firmware and everything else working as expected?

Which operating system version do you use? Has your colleague seen the same issue using computer with the same operating system and the same version? Can you check if this problem is present on any operating system (Mac, Linux)?

Best regards,
Dejan

RE: nRF Connect VS Code Extention

Emre Bayraktar — Tue, 14 Oct 2025 10:14:16 GMT

Hi Dejan,

No, I've also tried STM boards and the problem is not happening. My colleague also faced this issue on another computer.

Thanks & Best Regards,

Emre.

RE: nRF Connect VS Code Extention

dejans — Fri, 03 Oct 2025 06:18:01 GMT

Hi Emre,

Have you seen this problem previously with any other board apart from that specific Quectel device?
Can this issue be reproduced if Quectel device is not used (potentially using some other Nordic board instead)?

Best regards,
Dejan

RE: nRF Connect VS Code Extention

Emre Bayraktar — Thu, 02 Oct 2025 13:40:35 GMT

Hi Dejan,

Nothing unexpected happens and the problem do not occur. Here is the output:

PS C:\Users\A.ogur\Desktop\kernel_07.new_hw> nrfutil device device-info --serial-number 1057715871
serial_number: 001057715871
        boardVersion: PCA10156
        deviceFamily: NRF54L_FAMILY
        deviceName: nRF54L15
        deviceVersion: NRF54L15_xxAA_REV1
        jlinkObFirmwareVersion: J-Link OB-nRF5340-NordicSemi compiled Jul  8 2025 10:15:34

PS C:\Users\A.ogur\Desktop\kernel_07.new_hw>

RE: nRF Connect VS Code Extention

dejans — Tue, 23 Sep 2025 09:45:32 GMT

Hi Emre,

[quote user="dejans"]Did running "nrfutil device device-info --serial-number 1057715871" also cause "..., it continuously opens and closes these com ports, making them unusable"?[/quote][quote user="Emre Bayraktar"]The problem starts happenning as soon as I open the VS Code while the Quectel device is connected via USB. And when I disable the nRF Connect extention, it stops happening. So I can not tell you whether the problem can be created by that command or not. [/quote]

What happens if you run the command (shown above) when Quectel device is not connected and you do not disable nRF Connect extension?

Best regards,
Dejan

RE: nRF Connect VS Code Extention

Emre Bayraktar — Fri, 19 Sep 2025 12:40:44 GMT

Hi Dejan,

The problem starts happenning as soon as I open the VS Code while the Quectel device is connected via USB. And when I disable the nRF Connect extention, it stops happening. So I can not tell you whether the problem can be created by that command or not.

Best Regards,

Emre.

RE: nRF Connect VS Code Extention

dejans — Thu, 18 Sep 2025 09:40:40 GMT

Hi Emre,

Did running "nrfutil device device-info --serial-number 1057715871" also cause "..., it continuously opens and closes these com ports, making them unusable"?

Best regards,
Dejan

RE: nRF Connect VS Code Extention

Emre Bayraktar — Thu, 18 Sep 2025 07:52:59 GMT

Hi Dejan,

Here is the output:

PS C:\Users\A.ogur> nrfutil device list --hotplug
1057715871
Product         J-Link
Board version   PCA10156
Ports           COM143, vcom: 0
                COM142, vcom: 1
Traits          jlink, devkit, usb, serialPorts, seggerUsb, boardController

Supported devices found: 1

^S
PS C:\Users\A.ogur> nrfutil device device-info --serial-number 1057715871                   
serial_number: 001057715871        
        boardVersion: PCA10156     
        deviceFamily: NRF54L_FAMILY
        deviceName: nRF54L15       
        deviceVersion: NRF54L15_xxAA_REV1
        jlinkObFirmwareVersion: J-Link OB-nRF5340-NordicSemi compiled Feb 11 2025 17:15:35

PS C:\Users\A.ogur>

Best Regards,

Emre.

RE: nRF Connect VS Code Extention

dejans — Wed, 17 Sep 2025 05:53:31 GMT

Hi Emre,

Can you try to run the command shown below?

nrfutil device device-info --serial-number <SN_from_nrfutil_device_list>

What is the result?

Best regards,
Dejan

RE: nRF Connect VS Code Extention

Emre Bayraktar — Tue, 16 Sep 2025 08:52:52 GMT

Hi Dejan,

I've noticed it and tried with "list" command. It did not reproduce the issue. This command can detect the connected nrf devkit. But when I connect the Quectel device, open/close behaviour continues.

Best regards,

Emre.

RE: nRF Connect VS Code Extention

dejans — Mon, 15 Sep 2025 13:55:38 GMT

Hi Emre,

I have noticed that "list" was missing from suggested command. I apologize for this. Correct command is "nrfutil device list --hotplug". Is your issue reproducible using this command?

Best regards,
Dejan

RE: nRF Connect VS Code Extention

Emre Bayraktar — Mon, 15 Sep 2025 12:25:27 GMT

Hi,

The command returned error. Here is the output:

PS C:\ncs\v3.1.0\zephyr\samples\basic\blinky\build\blinky> nrfutil --version
nrfutil 8.1.0 (34e21a1 2025-07-29)
commit-hash: 34e21a1552aac39ed806b758e291c32039a54754
commit-date: 2025-07-29
host: x86_64-pc-windows-msvc
build-timestamp: 2025-07-29T10:51:28.573982200Z
classification: nrf-external

PS C:\ncs\v3.1.0\zephyr\samples\basic\blinky\build\blinky> nrfutil device --hotplug
error: unexpected argument '--hotplug' found

Usage: nrfutil device [OPTIONS] [COMMAND]

For more information, try '--help'.
PS C:\ncs\v3.1.0\zephyr\samples\basic\blinky\build\blinky>

Best regards,

Emre

RE: nRF Connect VS Code Extention

dejans — Mon, 15 Sep 2025 07:19:01 GMT

Hi,

Is this issue reproducible just by running "nrfutil device --hotplug"?

Best regards,
Dejan

RE: nRF Connect VS Code Extention

Emre Bayraktar — Mon, 15 Sep 2025 06:29:04 GMT

Hi,

The problem continues even if I plug in a Nordic device. I've confirmed the open/close behaviour caused by extention since it only happens when VS Code is open and extention enabled. In this state, I cannot use the Quectel's com ports with any application. When I disable the extention, open/close behaviour immediately stops and com ports became usable.

RE: nRF Connect VS Code Extention

dejans — Fri, 12 Sep 2025 14:46:33 GMT

Hi,

[quote user="Emre Bayraktar"]The problem arises when I plug in the Quectel device while the nRF Connect extention is enabled.[/quote]

When you plugged in Quectel device, was any of Nordic devices connected?
How did you verify opening and closing of the ports of the Quectel SoC by the extension?

Best regards,
Dejan

RE: nRF Connect VS Code Extention

Emre Bayraktar — Fri, 12 Sep 2025 12:25:57 GMT

Hi,

Sorry for the confusion. I've successfully installed and uploaded code to nrf54L devkit. I'm also doing development on Quectel's SoC's which connected via USB and creates seven virtual com ports for different purposes. I meant the Quectel's SoC by "another device".

The problem arises when I plug in the Quectel device while the nRF Connect extention is enabled. Once connected, extention continuously opens and closes the com ports of Quectel SoC. Since its automatically does this open/close behaviour, I've assumed that nRF connect continously search through avaiable com ports to find a nrf board.

RE: nRF Connect VS Code Extention

dejans — Fri, 12 Sep 2025 11:19:04 GMT

Hi,

What do you refer to as "auto board detection feature"?
Here are 2 board-related links - boards and devices overview and how to work with boards and devices.

Which device is "another device"? Is there some other device apart from "another device"? How many devices do you use? Which devices are connected during extension installation process?

Are you able to install nRF Connect for Desktop VS Code extension without having devices plugged in?

Best regards,
Dejan