qt_udp_socket_write_with_timer.cpp

#include <QObject>
#include <QCoreApplication>
#include <QUdpSocket>
#include <QTimer>

int main( int argc, char *argv[] )
{
    QCoreApplication app( argc, argv );

    QUdpSocket _s;
    _s.bind( QHostAddress::LocalHost, 9000 );

    QTimer t;
    t.start( 500 );

    QObject::connect( &t, &QTimer::timeout, [&_s]()
    {
        const QByteArray str { "Testing...\n" };
        auto ret = _s.writeDatagram( str, QHostAddress::LocalHost,9000 );
        qDebug() << str << "ret:" << ret;
    });

    return app.exec();
}