QSerialPort::readyRead() emiting not working?

[shokarta]

Im trying to figure out if its because of QSerialPort bug (but was fixed in 5.13.2 and im on 5.14.0 rc2).

led.h:

#ifndef LED_H
#define LED_H

#include <QObject>
#include <QSerialPort>
#include <QCoreApplication>

class LED : public QObject
{
    Q_OBJECT

public:
    explicit LED(QObject *parent = nullptr);
    Q_INVOKABLE void setColor(int red, int green, int blue);

public slots:

private:
    QSerialPort m_serial;
    void readReply();

signals:

};

#endif // LED_H

led.cpp:

#include <QtDebug>
#include "led.h"
#include <windows.h>
#include <QSerialPort>
#include <QSerialPortInfo>
#include <fileapi.h>
#include <QDataStream>
#include <QtSerialPort/QSerialPort>
#include <QCoreApplication>

QString m_port = "COM3";

LED::LED(QObject *parent) :
    QObject(parent)
{
    connect(&m_serial, &QSerialPort::readyRead, this, &LED::readReply);
}

void LED::readReply()
{
    const QByteArray receivedData = m_serial.readAll();
    qDebug() << "Received:" << receivedData;
}

void LED::setColor(int red, int green, int blue)
{
    QByteArray writeData;
    writeData.resize(15);
	// some noniportant staff populating writeData

    m_serial.setPortName(m_port);

    if (!m_serial.open(QIODevice::ReadWrite)) {
        qDebug() << "Can not open the" << m_port << "port:" << m_serial.errorString() << "//" << m_serial.error();
        m_serial.close();
        return;
    }
    if (!m_serial.setBaudRate(QSerialPort::Baud9600)) {
        qDebug() << "Could not set baud rate to 9600, remaining value is" << m_serial.baudRate();
        m_serial.close();
        return;
    }
    if (!m_serial.setDataBits(QSerialPort::Data8)) {
        qDebug() << "Could not set data bits number, remaining value is" << m_serial.dataBits();
        m_serial.close();
        return;
    }
    if (!m_serial.setParity(QSerialPort::NoParity)) {
        qDebug() << "Could not set parity check option, remaining value is" << m_serial.parity();
        m_serial.close();
        return;
    }
    if (!m_serial.setStopBits(QSerialPort::OneStop)) {
        qDebug() << "Could not set stop bits, remaining value is" << m_serial.stopBits();
        m_serial.close();
        return;
    }

    m_serial.write(writeData);
    m_serial.waitForBytesWritten(1500);     // max timeout 1000ms, set -1 to wait up to 30s
    qDebug() << "Sending:" << writeData;

    m_serial.close();
    return;
}

first of all, writing to the COM port works fine... its a LED screen and when I write() it changes color, so I can see it works fine... also the qDebug() << "Sending:" << writeData worksfine…

however, I have no responce whatsoever in my debug log...

what do I do wrong?

[J.Hilk]

@shokarta I'm pretty sure, your port has to remain open, for it to emit readyRead

[aha_1980]

@shokarta said in QSerialPort::readyRead() emiting not working?:

m_serial.waitForBytesWritten(1500);

Don't use waitFor... in programs that also use Signals&Slots.

Regards