Adding individual bytes to message for serial port

[agmar]

Hi,
i managed to simplify the code and i understand most of it, however, i am not sure how to combine the individual bytes into an array that could be sent

void MainWindow::openSeriall(){
    m_serial->setPortName(portName);
    m_serial->setBaudRate(QSerialPort::Baud19200);
    m_serial->setDataBits(QSerialPort::Data8);
    m_serial->setParity(QSerialPort::NoParity);
    m_serial->setFlowControl(QSerialPort::NoFlowControl);
    m_serial->setStopBits(QSerialPort::OneStop);

}

void MainWindow::writeSerial()
{
    quint8 message = 0xFF;
    message += quint8(mAddress)   ;
  //  message += QChar(0x55)       ;
  //  message += QChar(byte4)      ;
 //   message += QChar(mPSpeed)    ;
//    message += QChar(mTSpeed)    ;
//    message += QChar(mCheckSum)  ;
    qDebug() << message          ;
    if (m_serial->open(QIODevice::ReadWrite)) {
        QByteArray thisSend = message.toUtf8();
    m_serial->write(thisSend);
    m_serial->waitForBytesWritten(-1);
    m_serial->close();

}
}

i can send the values as QChars, but that adds an additional byte to the output,as i understand and that is not my goal
here is the issue:

error: request for member ‘toUtf8’ in ‘message’, which is of non-class type ‘quint8’ {aka ‘unsigned char’}
119 | quint8 thisSend = message.toUtf8();
| ^~~~~~

[jsulm]

@agmar said in Adding individual bytes to message for serial port:

quint8 message = 0xFF;

If you need an array then use one:

QByteArray message;
message.append(0xFF);
...
m_serial->write(message);