C++ (Qt)
void Server::initSocket()
 {
     udpSocket = new QUdpSocket(this);
     udpSocket->bind(QHostAddress::Any, 7755);
 
     connect(udpSocket, SIGNAL(readyRead()),
             this, SLOT(readPendingDatagrams()));
 }
 
 void Server::readPendingDatagrams()
 {
     while (udpSocket->hasPendingDatagrams()) {
         QByteArray datagram;
         datagram.resize(udpSocket->pendingDatagramSize());
         QHostAddress sender;
         quint16 senderPort;
 
         udpSocket->readDatagram(datagram.data(), datagram.size(),
                                 &sender, &senderPort);
 
         udpSocket->writeDatagram(datagram, sender, senderPort);
     }
 }