anycast_listen.java

主要用于无线传感网络的编写的书籍.对于初学者有着很大的用处

// $Id: Listen.java,v 1.5 2004/08/19 00:13:49 idgay Exp $

/*									tab:4
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 * All rights reserved.
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 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without written agreement is
 * hereby granted, provided that the above copyright notice, the following
 * two paragraphs and the author appear in all copies of this software.
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 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
 * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
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 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
 *
 * Copyright (c) 2002-2003 Intel Corporation
 * All rights reserved.
 *
 * This file is distributed under the terms in the attached INTEL-LICENSE     
 * file. If you do not find these files, copies can be found by writing to
 * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300, Berkeley, CA, 
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 */


package net.tinyos.tools;

import java.io.*;
import net.tinyos.packet.*;
import net.tinyos.util.*;
import net.tinyos.message.*;

public class Anycast_Listen {
    public static void main(String args[]) throws IOException {
	if (args.length > 0) {
	    System.err.println("usage: java net.tinyos.tools.Listen");
	    System.exit(2);
	}
	
	PacketSource reader = BuildSource.makePacketSource();
	if (reader == null) {
	    System.err.println("Invalid packet source (check your MOTECOM environment variable)");
	    System.exit(2);
	}

	try {
	  reader.open(PrintStreamMessenger.err);
	  for (;;) {
	    byte[] packet = reader.readPacket();
	    anycast_info(packet);
	    //Dump.printPacket(System.out, packet);
	    //System.out.println();
	    //System.out.flush();
	  }
	}
	catch (IOException e) {
	    System.err.println("Error on " + reader.getName() + ": " + e);
	}
    }

    public static String addzero(String in) {
	while(in.length() != 2)
	    in = "0" + in;
	return in;
    }

    public static void anycast_info(byte[] packet) {
	if(packet.length != 34) {
	    System.out.println("Unknown packet received");
	    return;
	}

	int i=6;
	String src1 = addzero(Integer.toHexString(packet[i+1] & 0xff).toUpperCase())+""+
		addzero(Integer.toHexString(packet[i] & 0xff).toUpperCase());

	int src = Integer.parseInt(src1,16);

	i+=2;
	String parent1 = addzero(Integer.toHexString(packet[i+1] & 0xff).toUpperCase())+""+
		addzero(Integer.toHexString(packet[i] & 0xff).toUpperCase());

	int parent = Integer.parseInt(parent1,16);

	i+=2;
	String seq1 = Integer.toHexString(packet[i++] & 0xff).toUpperCase();
	
	int seq = Integer.parseInt(seq1,16);

	String hop1 = Integer.toHexString(packet[i++] & 0xff).toUpperCase();

	int hop = Integer.parseInt(hop1,16);
	
	String from1 = addzero(Integer.toHexString(packet[i+1] & 0xff).toUpperCase())+""+
		addzero(Integer.toHexString(packet[i] & 0xff).toUpperCase());

	int from = Integer.parseInt(from1,16);

	//System.out.println("[" + new java.util.Date() + "]");
	System.out.println("src:" + src + " par:" + parent + " seq:" + seq + " hop:" + hop);
    }
}