Update README and add contrib dir

contrib/traffic-generator/model/ethernet-generator.h

@@ -0,0 +1,72 @@
+#ifndef ETHERNET_GENERATOR_H
+#define ETHERNET_GENERATOR_H
+
+#include "ns3/application.h"
+#include "ns3/event-id.h"
+#include "ns3/ptr.h"
+#include <ns3/traced-callback.h>
+#include "ns3/ethernet-net-device.h"
+
+namespace ns3
+{
+
+class Socket;
+class Packet;
+
+
+class EthernetGenerator : public Application
+{
+  public:
+    /**
+     * \brief Get the type ID.
+     * \return the object TypeId
+     */
+    static TypeId GetTypeId();
+
+    EthernetGenerator();
+
+    ~EthernetGenerator() override;
+
+    /**
+     * \return the total bytes sent by this app
+     */
+
+    void Setup(Ptr<EthernetNetDevice> net);
+
+    typedef TracedCallback<Ptr<const Packet>, uint16_t> PacketVlanTraceCallback;
+
+  protected:
+    void DoDispose() override;
+
+  private:
+    void StartApplication() override;
+    void StopApplication() override;
+
+    /**
+     * \brief Send a packet
+     */
+    void SendBurst();
+    void Send();
+
+    Address m_destAddress;
+    int m_payload_size;
+    int m_burst_size;
+    Time m_period;
+    Time m_interframe;
+    Time m_offset;
+
+    uint16_t m_vid;
+    uint8_t m_pcp;
+    uint8_t m_dei;
+
+    EventId m_sendEvent;   //!< Event to send the next packet
+    Ptr<EthernetNetDevice> m_net;
+
+    PacketVlanTraceCallback m_pktSentTrace;
+
+    static const uint16_t MIN_PAYLOAD_SIZE = 42;      //Min payload size with VLAN
+};
+
+} // namespace ns3
+
+#endif