Struggling with BluetoothCharacteristic.value about flutter_web_bluetooth HOT 2 OPEN

/// blue.Bluetooth is a BluetoothDevice object
blue.Bluetooth.readCharacteristic.value
          .timeout(Duration(seconds: 5))
          .firstWhere((d) {
        if (d.isNotEmpty) {
          if (d[0] == SOME_VAL) {
            if (d[1] <= 100) {
              setState(() => readingVal = d[1] / 100);
              return true;
            }
          }
        }
        return false;
      }, orElse: () => null);

blueWeb.Bluetooth.readCharacteristic.value
          .timeout(Duration(seconds: 5))
          .firstWhere((d) {
        /// trying to convert <ByteData> to List<int>
        List<int> dList = new List.from(
            d.buffer.asUint8List(d.offsetInBytes, d.lengthInBytes));
        if (dList.isNotEmpty) {
          if (dList[0] == SOME_VAL) {

            if (dList[1] <= 100) {
              setState(() => readingVal = dList[1] / 100);
              return true;
            }
          }
        }
        return false;
      }, orElse: () => null);