//  Socket init
this->UdpSocket->bind( QHostAddress::Any, ARTNET_PROTOCOL_PORT );

connect( this->UdpSocket, SIGNAL(readyRead()), this, SLOT(readPendingDatagrams()), Qt::UniqueConnection );

[...]

void ArtNetManager::readPendingDatagrams()
{
    QNetworkDatagram networkDatagram;

    qDebug("Udp datagram received");

    while( this->UdpSocket->hasPendingDatagrams() )
    {
        networkDatagram = this->UdpSocket->receiveDatagram();

        qDebug("Received datagram from IP address: %s", networkDatagram.senderAddress().toString().toLatin1().data() );

        this->receiveDatagram( networkDatagram.data() );
    }
}

void ArtNetManager::sendDatagram()
{
    QByteArray ArtNet_RawMsg;

    ArtNet_RawMsg.append( "Test program" );

    //  Writes data on the UDP socket
    qint64 sentBytes = this->UdpSocket->writeDatagram( ArtNet_RawMsg, QHostAddress::Broadcast, ARTNET_PROTOCOL_PORT );

    if( sentBytes == -1 )
    {
        qDebug("Cannot send data on UPD socket. Error: %d", this->UdpSocket->error() );
    }
    else if( sentBytes != ArtNet_RawMsg.size() )
    {
        qDebug("Wrong number of bytes sent. Bytes sent on socket: %d, tx buffer length: %d", sentBytes, ArtNet_RawMsg.size());
    }
}