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#include <QtNetwork>

class Server : public QObject

{

    Q_OBJECT

public:

    Server(int port)

    {

        connect(&serverSocket, SIGNAL(readyRead()),

                this, SLOT(sendEcho()));

        if (serverSocket.bind(QHostAddress::Any, port,

                              QUdpSocket::ReuseAddressHint

                              | QUdpSocket::ShareAddress)) {

            printf("OK\n");

        } else {

            printf("FAILED\n");

        }

        fflush(stdout);

    }

private slots:

    void sendEcho()

    {

        QHostAddress senderAddress;

        quint16 senderPort;

        char data[1024];

        qint64 bytes = serverSocket.readDatagram(data, sizeof(data), &senderAddress, &senderPort);

        if (bytes == 1 && data[0] == '\0')

            QCoreApplication::instance()->quit();

        for (int i = 0; i < bytes; ++i)

            data[i] += 1;

        serverSocket.writeDatagram(data, bytes, senderAddress, senderPort);        

    }

private:

    QUdpSocket serverSocket;

};

int main(int argc, char **argv)

{

    QCoreApplication app(argc, argv);

    Server server(app.arguments().at(1).toInt());

    return app.exec();

}

#include "main.moc"