QBluetoothSocket write data

I'm trying to write data 3 times in a row with the function QBluetoothSocket::writeData.

QString sProtocolCommand = "A0000";

QByteArray nCommandData;

nCommandData.append(DT_PRT_PREFIX_PACKET);

nCommandData.append(m_nEncodeText->fromUnicode(sProtocolCommand));

nCommandData.append(DT_PRT_POSTFIX_PACKET); 

socket->write(nCommandData);

socket->write(nCommandData);

socket->write(nCommandData);

My problem is that the programm writes the data only once.

The data I am trying to write contains a carriage return. 

If I remove the carriage return of the data the program writes well three times the data. I think the problem comes from the carriage return

Exactly the same code works on Android