class RuuviTagAdvertisementCallback: public BLEAdvertisedDeviceCallbacks {
    void onResult(BLEAdvertisedDevice advertisedDevice) {
      RuuviMeasurement measurement;

      if (parser.parseRuuviMeasurement(advertisedDevice.getManufacturerData(), &measurement)) {
        if ((measurement.macAddress & RUUVI_MAC_SUFFIX) == RUUVI_MAC_SUFFIX) {
          Serial.println("Temperature is " + String(measurement.temperature));
        }                         
      }
    }
};