osd-contiki/tools/collect-view/src/se/sics/contiki/collect/UDPConnection.java

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