First of all, thank you for your work! I am working on a device that

ok, it wasn't easy/obvious, but I got it working. Here's the code <div class="snip

Generating a QR code string about esp32-arduino-matter HOT 3 CLOSED

yacubane commented on May 19, 2024

Generating a QR code string

from esp32-arduino-matter.

Comments (3)

smeisner commented on May 19, 2024

A few more details...

I did try changing the data type of the QRCode to MutableCharSpan and copying the returned string as QRCode.data(), which compiles. The problem I am seeing now is when calling GetQRCode() it returns CHIP_ERROR_BUFFER_TOO_SMALL (0x19).

I am assuming this is due to declaring QRCode simply as MutableCharSpan QRCode;. How do you provide storage when declaring the variable? ...or after?

from esp32-arduino-matter.

smeisner commented on May 19, 2024

ok, it wasn't easy/obvious, but I got it working. Here's the code

.
.
.

  ESP_LOGE(TAG, "Calling esp_matter::start()\n");
  // Start Matter device
  esp_matter::start(on_device_event);

  // Get QR Code 
  std::string QRCode = "                                 ";  // 33 chars
  CHIP_ERROR err;

  ESP_LOGE(TAG, "Calling PrintOnboardingCodes()\n");
  // Print codes needed to setup Matter device
  #if 0
    PrintOnboardingCodes(RendezvousInformationFlags(RendezvousInformationFlag::kOnNetwork));
  #else
    err = GetQRCode((MutableCharSpan &)QRCode, RendezvousInformationFlag::kOnNetwork);
    if (err == CHIP_NO_ERROR)
    {
      // strcpy (OperatingParameters.MatterQR, QRCode.data());
      strcpy (OperatingParameters.MatterQR, QRCode.c_str());
      ESP_LOGE(TAG, "QR Pairing Code: '%s'\n", OperatingParameters.MatterQR);
    } else {
      ESP_LOGE(TAG, "Failed to GetQRCode() -- Error: %d\n", err.AsInteger());
    }
  #endif

from esp32-arduino-matter.