Zusammenfassung für Tracer.
        private void btn_start_Click(object sender, EventArgs e)
        {
            if ( "Start capturing"  == btn_start.Text )
            {
                m_packet_listener = new UDPMessageListener(int.Parse(tb_port.Text), System.Net.Sockets.ProtocolType.Udp, true);
                m_tracer = new CTracer(m_sFileName, true);
                m_packet_listener.OnMessage += new UDPMessageListener.OnMessageCallback(OnReceivedMessage);
                btn_start.Text = "Stop capturing";

                m_serialPort.PortName = m_cbx_serialPort.SelectedItem.ToString();
                m_serialPort.BaudRate = int.Parse(cbxBaud.Text);
                m_serialPort.Open();
            }
            else
            {
                m_tracer.Close();
                m_packet_listener = null;
                m_tracer = null;
                btn_start.Text = "Start capturing";
                m_serialPort.Close();
            }
        }