How to retrieve the Matter QR code?

[SunHuang]

Due to production requirements, I need to obtain the device's QR code. However, I found that the QR code can only be retrieved using the code snippet below after calling Nrf::Matter::StartServer().
Since there are several production test items that need to be performed, I would like to retrieve the QR code immediately after the hardware initialization.
Is there any way to obtain the QR code right after the device boots up?
My SDK version is NCS 2.9.0.

CHIP_ERROR Sunion::AppTask::StartApp()
{
	ReturnErrorOnFailure(Init());

	AppEvent event = {};

    DoorLockServer::Instance().SetSoundVolume(kLockEndpointId, Para.BuzzerPercent);


    char buffer[128 + 1];
    chip::MutableCharSpan qrCode(buffer);
    chip::RendezvousInformationFlags rendezvousFlags = chip::RendezvousInformationFlag::kBLE;

    if (GetQRCode(qrCode, rendezvousFlags) == CHIP_NO_ERROR)
    {
        ChipLogProgress(AppServer, "SetupQRCode: [%s]", qrCode.data());
    }
    else
    {
        ChipLogError(AppServer, "Failed to get QR code");
    }

	while (true) {
		k_msgq_get(&sAppEventQueue, &event, K_FOREVER);
		DispatchEvent(event);
		Ex_StateMachine();
	}

	return CHIP_NO_ERROR;
}

[SunHuang]

Hi,

I understand the steps you mentioned, but in my case, it's for mass production purposes. I need to transmit the QR code using a specific communication format. This protocol is for internal use. I must send out the QR code immediately upon startup.

[JONATHAN LL]

Checked internally and for production we do recommend to use our Factory Data module. Here is an instruction for QR code generation: https://docs.nordicsemi.com/bundle/ncs-latest/page/matter/nrfconnect_factory_data_configuration.html#generating_onboarding_codes . but it can be used independently based on VID/PID/discriminator and passcode.

You may use the helper python script and integrate it in production line, where factory_data partition content can be generated uniquely for each device. For development, we also include the passcode in the firmware which allows to print the URL to QR code in the shell command.

[SunHuang]

Hi,

I understand what you mean, and we do generate the QR code in that way as well. However, what I'm referring to is the production testing phase. I would like to verify that the hardware functions correctly before transmitting data using our custom communication protocol. You only need to tell me how to read the QR code before calling Nrf::Matter::StartServer().