QtNetwork: Why don't I detect incomming connections ? (incomingConnection() is never

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I sticked to the tutorial about threaded qt-networking (which is here: http://doc.qt.io/qt-5/qtnetwork-thre...r-example.html), I made some minor changes and integrated it into my main program. However incomingConnection() never gets executed, on the other hand the client is able to connect. Since I'd like to work with incomingConnection() it became obsolete to work with the SIGNAL(newConnection()) but even this isn't working.

Somebody knows what's going wrong?

Here my .h

#include <QtNetwork>
#include <QTcpServer>
#include <QTcpSocket>
#include <QThread>
 
class WirelessNetThread: public Thread
{
    Q_OBJECT
 
public:
    WirelessNetThread(int socketDescriptor, QObject * parent);
 
    void run() Q_DECL_OVERRIDE;
 
signals:
    void error(QTcpSocket::SocketError socketError);
 
private:
    int socketDescriptor;
    QString text;
};
 
class WirelessNet : public QTcpServer
{
    Q_OBJECT
 
public:
    WirelessNet(QObject *parent = 0);
 
protected:
    void incomingConnection(qintptr socketDescriptor) Q_DECL_OVERRIDE;
 
};

#include <QtNetwork>
#include <QTcpServer>
#include <QTcpSocket>
#include <QThread>

class WirelessNetThread: public Thread
{
    Q_OBJECT

public:
    WirelessNetThread(int socketDescriptor, QObject * parent);

    void run() Q_DECL_OVERRIDE;

signals:
    void error(QTcpSocket::SocketError socketError);

private:
    int socketDescriptor;
    QString text;
};

class WirelessNet : public QTcpServer
{
    Q_OBJECT

public:
    WirelessNet(QObject *parent = 0);

protected:
    void incomingConnection(qintptr socketDescriptor) Q_DECL_OVERRIDE;

};

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And the .cpp

WirelessNetThread::WirelessNetThread(int socketDescriptor, QObject *parent):QThread(parent), socketDescriptor(socketDescriptor)
{
}
 
void WirelessNetThread::run()
{
    QTcpSocket tcpSocket;
    if ( !tcpSocket.setSocketDescriptor(socketDescriptor))
    {
        emit error(tcpSocket.error());
        return;
    }
 
    tcpSocket.disconnectFromHost();
    tcpSocket.waitForDisconnected();
}
 
WirelessNet::WirelessNet(QObject *parent): QTcpServer(0)
{
    listen(QHostAddress::Any, 5220);
    printf("is listening %d\n", this->isListening());
}
 
void WirelessNet::incomingConnection(qintptr socketDescriptor)
{
    qDebug() << "incomming \n";
    printf("incomming \n");
    WirelessNetThread *thread = new WirelessNetThread(socketDescriptor, this);
    connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));
    thread->start();
}

WirelessNetThread::WirelessNetThread(int socketDescriptor, QObject *parent):QThread(parent), socketDescriptor(socketDescriptor)
{
}

void WirelessNetThread::run()
{
    QTcpSocket tcpSocket;
    if ( !tcpSocket.setSocketDescriptor(socketDescriptor))
    {
        emit error(tcpSocket.error());
        return;
    }

    tcpSocket.disconnectFromHost();
    tcpSocket.waitForDisconnected();
}

WirelessNet::WirelessNet(QObject *parent): QTcpServer(0)
{
    listen(QHostAddress::Any, 5220);
    printf("is listening %d\n", this->isListening());
}

void WirelessNet::incomingConnection(qintptr socketDescriptor)
{
    qDebug() << "incomming \n";
    printf("incomming \n");
    WirelessNetThread *thread = new WirelessNetThread(socketDescriptor, this);
    connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));
    thread->start();
}

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here the excerpt out of my main program, where it is initiated (by the way it doesn't matter if I leave out moveToThread()):

WirelessNet* wifi = new WirelessNet(this->parent());
wifi->moveToThread(this->thread());

WirelessNet* wifi = new WirelessNet(this->parent());
wifi->moveToThread(this->thread());

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Even this has no influence if I add these lines after the initalization of wifi:

wifi = new WirelessNet(this->parent());
QEventLoop testLoop;
testLoop.exec();

wifi = new WirelessNet(this->parent());
QEventLoop testLoop;
testLoop.exec();

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In other words "incomming" is never printed out, and so I'm not able to work on. Has anyone an idea, this is pretty much 1:1 the code from the tutorial that's what confuses me.

Kind Regards