mode_raw.ino

const int numberOfChannels = numLeds * 3; // Total number of channels you want to receive (1 led = 3 channels)
const int maxUniverses = numberOfChannels / 512 + ((numberOfChannels % 512) ? 1 : 0);
bool universesReceived[maxUniverses];
bool sendFrame = 1;
int previousDataLength = 0;

void raw_mode(const uint32_t universe, const uint8_t* data, const uint16_t length) {
  sendFrame = 1;
  // set brightness of the whole strip 
  /*
  if (universe == 15) {
    leds.setBrightness(data[0]);
    leds.show();
  }
  */

  // Store which universe has got in
  if ((universe - startUniverse) < maxUniverses)
    universesReceived[universe - startUniverse] = 1;

  for (int i = 0 ; i < maxUniverses ; i++) {
    if (universesReceived[i] == 0) {
      //Serial.println("Broke");
      sendFrame = 0;
      break;
    }
  }

  // read universe and put into the right part of the display buffer
  for (int i = 0; i < length / 3; i++) {
    int led = i + (universe - startUniverse) * (previousDataLength / 3);
    if (led < numLeds)
      leds.setPixelColor(led, data[i * 3], data[i * 3 + 1], data[i * 3 + 2]);
  }
  previousDataLength = length;     
  
  if (sendFrame) {
    leds.show();
    // Reset universeReceived to 0
    memset(universesReceived, 0, maxUniverses);
  }
}