Qt serial communication timeout at waitforreadyread - c++

Question

I try to get serial communication working, but struggle at waiting for the response. The logic should be to send data, wait for a response, get the response and then repeat.
To speed up my code and preventing it from blocking other independent parts of the code I run the serial communication in a separate thread.
The problem is in the send function, where I always get a "Timeout" message instead of an "Success" message.
serial.h
#ifndef SERIAL_H
#define SERIAL_H
#include <QThread>
#include <QDebug>
#include <QSerialPort>
#include <QSerialPortInfo>
#include <QStringList>
class Serial : public QThread
{
Q_OBJECT
public:
Serial();
bool send(QString text);
bool connectSerial();
void disconnectSerial();
signals:
void dataReceived(QByteArray receivedData);
protected:
void run();
private slots:
void onGetData();
private:
void readAngles();
QSerialPort qsp;
QSerialPortInfo qspi;
QByteArray receivedData;
};
#endif // SERIAL_H
serial.cpp
#include "serial.h"
Serial::Serial()
{
connect(&qsp, SIGNAL(readyRead()), this, SLOT(onGetData()));
}
bool Serial::send(QString text)
{
if (qsp.isWritable()) {
QByteArray buffer = text.toLatin1();
if (buffer.size() != qsp.write(buffer))
qDebug() << "Send does not work";
qsp.flush();
if(!qsp.waitForReadyRead(2500)) {
qDebug() << "Timeout";
} else {
qDebug() << "Success";
}
return true;
} else {
return false;
}
}
void Serial::onGetData()
{
qDebug() << "onGetData called";
qDebug() << qsp.readAll();
}
bool Serial::connectSerial(int port)
{
qDebug() << qspi.availablePorts().count();
for(int i=0; i<qspi.availablePorts().count(); i++) {
qDebug() << qspi.availablePorts().at(i).description();
}
qsp.setPort(qspi.availablePorts().at(port));
qsp.setBaudRate(QSerialPort::Baud9600);
qsp.setDataBits(QSerialPort::Data7);
qsp.setFlowControl(QSerialPort::NoFlowControl);
qsp.setParity(QSerialPort::NoParity);
qsp.setStopBits(QSerialPort::OneStop);
return qsp.open(QIODevice::ReadWrite);
}
/**
* #brief Disconnecting from serial port.
*/
void Serial::disconnectSerial()
{
if (qsp.isOpen()) {
qsp.close();
}
}
void Serial::readAngles()
{
send("012345");
}