Initial version.

CMakeLists.txt

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+cmake_minimum_required(VERSION 2.8)
+project(s20)
+
+# Find includes in corresponding build directories
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+# Instruct CMake to run moc automatically when needed.
+set(CMAKE_AUTOMOC ON)
+
+# Find the QtWidgets library
+find_package(Qt5Network)
+
+# Tell CMake to create the helloworld executable
+add_executable(s20 s20.cpp)
+
+# Use the Widgets module from Qt 5.
+target_link_libraries(s20 Qt5::Network)

s20.cpp

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+/*************************************************************************
+ *  Copyright (C) 2015 by Andrius Štikonas <andrius@stikonas.eu>         *
+ *                                                                       *
+ *  This program is free software; you can redistribute it and/or modify *
+ *  it under the terms of the GNU General Public License as published by *
+ *  the Free Software Foundation; either version 3 of the License, or    *
+ *  (at your option) any later version.                                  *
+ *                                                                       *
+ *  This program is distributed in the hope that it will be useful,      *
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of       *
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
+ *  GNU General Public License for more details.                         *
+ *                                                                       *
+ *  You should have received a copy of the GNU General Public License    *
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.*
+ *************************************************************************/
+
+#include <QCoreApplication>
+#include <QByteArray>
+#include <QHostAddress>
+#include <QUdpSocket>
+
+class Server : public QObject
+{
+Q_OBJECT
+public:
+	Server();
+
+	bool received;
+
+private slots:
+	void readPendingDatagrams();
+
+private:
+	QByteArray* makeNewDatagram();
+
+	QUdpSocket *udpSocketSend;
+	QUdpSocket *udpSocketGet;
+};
+
+
+Server::Server(){
+	received = false;
+	udpSocketSend = new QUdpSocket();
+	udpSocketGet  = new QUdpSocket();
+	QHostAddress *host  = new QHostAddress("192.168.1.212");
+	QHostAddress *bcast = new QHostAddress("192.168.1.255");
+
+	udpSocketSend->connectToHost(*bcast, 10000);
+	udpSocketGet->bind(*host, 10000);
+	connect(udpSocketGet, SIGNAL(readyRead()), this, SLOT(readPendingDatagrams()));
+
+	QByteArray *datagram = makeNewDatagram(); // data from external function
+	udpSocketSend->write(*datagram);
+	qWarning() << "sent";
+}
+
+QByteArray* Server::makeNewDatagram()
+{
+	 QByteArray *datagram = new QByteArray;
+	 *datagram = QByteArray::fromHex("68 64 00 06 71 61"); // global discovery
+// 	 *datagram = QByteArray::fromHex("68 64 00 1e 63 6c ac cf 23 35 f5 8c 20 20 20 20 20 20 8c f5 35 23 cf ac 20 20 20 20 20 20"); // subscribe
+// 	 *datagram = QByteArray::fromHex("68 64 00 17 64 63 ac cf 23 35 f5 8c 20 20 20 20 20 20 00 00 00 00 00"); // power off
+// 	 *datagram = QByteArray::fromHex("68 64 00 17 64 63 ac cf 23 35 f5 8c 20 20 20 20 20 20 00 00 00 00 01"); // power on
+	 return datagram;
+}
+
+void Server::readPendingDatagrams()
+{
+    qWarning() << "read0";
+    while (udpSocketGet->hasPendingDatagrams()) {
+        QByteArray datagram;
+        datagram.resize(udpSocketGet->pendingDatagramSize());
+        QHostAddress sender;
+        quint16 senderPort;
+
+        udpSocketGet->readDatagram(datagram.data(), datagram.size(), &sender, &senderPort);
+
+	qWarning() << "read";
+	qWarning() << QString(datagram);
+//         processTheDatagram(datagram);
+	received = true;
+    }
+}
+
+int main(int argc, char *argv[])
+{
+	QCoreApplication s20(argc, argv);
+	Server server;
+	while (!server.received)
+	{
+		true;
+	}
+	return 0;
+}
+
+#include "s20.moc"