true representation in binary or hex

[Tadas]

Hi, I have made server which sends true value to device, but I'm looking for solution, how to do this differently. this code works fine

QByteArray ba;
QDataStream out(&ba, QIODevice::WriteOnly);
out << true;
clientConnection->write(ba);

QByteArray ba;
QDataStream out(&ba, QIODevice::WriteOnly);
out << true;
clientConnection->write(ba);

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how to change this line:
out << true;
to something like this
out << 01; //this is not working

I'm wondering how can I achieve same result by not using Boolean value true?
Or maybe it is possible to do the same without QDataStream and QByteArray
just do something like this:
clientConnection->write("1") // this is not working

Thanks for advice