Waiting for new values sent by UDP in Qt

[Damiann]

Hi guys!
I have quite easy, I guess ^^, problem with modification of my code. In general it reads incomming messeges (UDP) and print them in cmd. Instead of reading them all the time, I would like to modify it to wait for new value and then display. Thanks in advance for any help!

Code:

#include "myudp.h"
 
MyUDP::MyUDP(QObject *parent) :
    QObject(parent)
{
        socket = new QUdpSocket(this);
        socket->bind(QHostAddress::LocalHost, 25000);
        connect(socket, SIGNAL(readyRead()), this, SLOT(readyRead()));
}
 
void MyUDP::readyRead()
{
    double a[3];
    double prev_a[3];
 
    QByteArray buffer;
    buffer.resize(socket->pendingDatagramSize());
 
    QHostAddress sender;
    quint16 senderPort;
 
    socket->readDatagram(buffer.data(), buffer.size(),
                         &sender, &senderPort);
 
    if(a[0] != prev_a[0] || a[1] != prev_a[1] || a[2] != prev_a[2])
{
        memcpy(&a, buffer, 3*sizeof(double));
        qDebug() << "\nMessage from: " << sender.toString();
        qDebug() << "Message port: " << senderPort;
        qDebug() << "X:" << a[0];
        qDebug() << "Y:" << a[1];
        qDebug() << "V:" << a[2];
}
prev_a[0] = a[0];
prev_a[1] = a[1];
prev_a[2] = a[2];
 
}

#include "myudp.h"

MyUDP::MyUDP(QObject *parent) :
    QObject(parent)
{
        socket = new QUdpSocket(this);
        socket->bind(QHostAddress::LocalHost, 25000);
        connect(socket, SIGNAL(readyRead()), this, SLOT(readyRead()));
}

void MyUDP::readyRead()
{
    double a[3];
    double prev_a[3];

    QByteArray buffer;
    buffer.resize(socket->pendingDatagramSize());

    QHostAddress sender;
    quint16 senderPort;

    socket->readDatagram(buffer.data(), buffer.size(),
                         &sender, &senderPort);

    if(a[0] != prev_a[0] || a[1] != prev_a[1] || a[2] != prev_a[2])
{
        memcpy(&a, buffer, 3*sizeof(double));
        qDebug() << "\nMessage from: " << sender.toString();
        qDebug() << "Message port: " << senderPort;
        qDebug() << "X:" << a[0];
        qDebug() << "Y:" << a[1];
        qDebug() << "V:" << a[2];
}
prev_a[0] = a[0];
prev_a[1] = a[1];
prev_a[2] = a[2];

}

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