141 lines
4.7 KiB
Java
141 lines
4.7 KiB
Java
/*
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* Copyright (c) 2011, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* -----------------------------------------------------------------
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*
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* UDPConnection
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*
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* Authors : Niclas Finne
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* Created : 1 June 2011
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*/
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package org.contikios.contiki.collect;
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import java.io.IOException;
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import java.net.DatagramPacket;
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import java.net.DatagramSocket;
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import java.net.InetAddress;
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import java.io.*;
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/**
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*
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*/
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public class UDPConnection extends SerialConnection {
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private final int port;
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private DatagramSocket serverSocket;
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public UDPConnection(SerialConnectionListener listener, int port) {
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super(listener);
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this.port = port;
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}
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@Override
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public String getConnectionName() {
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return "<UDP:" + port + ">";
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}
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@Override
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public void open(String comPort) {
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close();
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this.comPort = comPort == null ? "" : comPort;
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isClosed = false;
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try {
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serverSocket = new DatagramSocket(port);
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System.out.println("Opened UDP port: " + port);
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/* Start thread listening on UDP */
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Thread readInput = new Thread(new Runnable() {
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public void run() {
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byte[] data = new byte[1024];
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try {
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while (isOpen) {
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DatagramPacket packet = new DatagramPacket(data, data.length);
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serverSocket.receive(packet);
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InetAddress addr = packet.getAddress();
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System.out.println("UDP: received " + packet.getLength() + " bytes from " + addr.getHostAddress() + ":" + packet.getPort());
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StringWriter strOut = new StringWriter();
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PrintWriter out = new PrintWriter(strOut);
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int payloadLen = packet.getLength() - 2;
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out.printf("%d", 8 + payloadLen / 2);
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/* Timestamp. Ignore time synch for now. */
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long time = System.currentTimeMillis() / 1000;
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out.printf(" %d %d 0",
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((time >> 16) & 0xffff), time & 0xffff);
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byte[] payload = packet.getData();
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int seqno = payload[0] & 0xff;
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int hops = 0; /* how to get TTL / hot limit in Java??? */
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byte[] address = addr.getAddress();
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/* Ignore latency for now */
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out.printf(" %d %d %d %d",
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((address[14] & 0xff) +
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((address[15] & 0xff) << 8))&0xffff, seqno, hops, 0);
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int d = 0;
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for(int i = 0; i < payloadLen ; i += 2) {
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d = (payload[i + 2] & 0xff) + ((payload[i + 3] & 0xff) << 8);
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out.printf(" %d", d & 0xffff);
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}
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String line = strOut.toString();
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serialData(line);
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}
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System.out.println("SerialConnection UDP terminated.");
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closeConnection();
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} catch (IOException e) {
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lastError = "Error when reading from SerialConnection UDP: " + e;
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System.err.println(lastError);
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if (!isClosed) {
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e.printStackTrace();
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closeConnection();
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}
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}
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}
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}, "UDP thread");
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isOpen = true;
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serialOpened();
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readInput.start();
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} catch (Exception e) {
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lastError = "Failed to open UDP server at port " + port + ": " + e;
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System.err.println(lastError);
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e.printStackTrace();
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closeConnection();
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}
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}
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@Override
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protected void doClose() {
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if (serverSocket != null) {
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serverSocket.close();
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serverSocket = null;
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}
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}
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}
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