[SNMP4J] My Hello World app !!!

[Rodolfo Josÿffffe9 Castellanos Jaimes]

Hi friends. I hope all you be well.

I'm just beginning to work with the SNMP4J package
from the programming point of view. I was looking for
a "hello world" like app but I didn't find it. I saw
that some people in the recent past have had the same
needing.

Yesterday that I did was to debug (running step by
step) the SnmpRequest.java example, after I read this
suggestion of Frank Fock in this link: 
http://p15141779.pureserver.info/pipermail/snmp4j/2004-October/000149.html

Nice for me, the example run "perfectly". Also, I have
some doubts like why -96 in the following line ?
    request.setType( -96 ); // ????

I hope I can find the justification soon.

Well, that's all.
Any suggestion, criticism, idea or question will be
welcome.

This is the source code:

/*
 * HelloWorldSNMP.java
 *
 * Created on 27 de enero de 2005, 04:02 PM
 */

/**
 *
 * @author rodolfojcj
 * @version 1.0
 */
/*
 * This is my first app using SNMP4J package.
 * My goal with it is to send a message with a GET PDU
 * to my computer, which is running a snmp daemon.
 * In this example, only the sysName (1.3.6.2.1.1.5.0)
object is requested
 *
 * I've just tested it in this scenario:
 * - O.S. Linux Fedora Core 1 
 * - snmpd service or daemon is running
 * - "public" is the community
 * - Only tested for SnmpV1
 * - IDE NetBeans 4.0
 * - JDK 1.5.0
 * 
 * I've just followed the SnmpRequest.java program
(which is part of 
 * the snmp4j package, corresponding to the tools) to
do this example
 */

package myExamples;

import org.snmp4j.*;
import org.snmp4j.smi.*;
import
org.snmp4j.transport.DefaultUdpTransportMapping;
import org.snmp4j.mp.*;

import java.io.IOException;
import java.util.Vector;

public class HelloWorldSNMP {
    // class members
    OctetString community = new OctetString( "public"
);
    Address address = new UdpAddress( "localhost/161"
);
    TransportMapping transport;
    Snmp snmp;
    Target target;
    Vector vbs = new Vector();
    
    /** Creates a new instance of HacerGetSNMPV1 */
    public HelloWorldSNMP() {
        // 1. create SNMP session
        try {
        transport = new DefaultUdpTransportMapping();
        snmp = new Snmp( transport );
        }
        catch ( IOException e )
        {
        }
        
        // 2. set the target which will be requested
        CommunityTarget targetX = new
CommunityTarget();
        targetX.setCommunity( community );
        target = ( Target ) targetX;
        
        target.setVersion( 0 );
        target.setAddress( address );
        target.setRetries( 1 );
        target.setTimeout( 1000 );
        
        try {
            snmp.listen();
        }
        catch ( IOException e )
        {
        
        }
        
        // 3. create the PDU of the message. In this
case a GET
        PDU request = new PDU();
        request.setType( -96 ); // honestly, I don't
know yet why -96 ???
        
        //
        vbs.add( new VariableBinding( new OID(
"1.3.6.1.2.1.1.5.0" ) ) );
        
        //for ( int i = 0; i < vbs.size(); i++ )
            request.add( ( VariableBinding ) vbs.get(
0 ) );        
        
        // prepare to get the response of the agent
        PDU response = null;
        try {
            response = snmp.sendPDU( request, target
);
            snmp.close();            
        }
        catch ( IOException e )
        {
        }
        
        // 4. print output
        System.out.println( "Response received with
requestID = " 	+ response.getRequestID() +
            " , errorIndex = " +
response.getErrorIndex() +
            " , errorStatus = " +
response.getErrorStatus() );        
        for ( int i = 0; i < response.size(); i++ )
        {
            VariableBinding vb = response.get( i );
            System.out.println( vb.toString() );
        }
    }
    
    public static void main( String args[] )
    {
        System.out.println( "Hello World SNMP4J !!!"
);
        System.out.println( " The beginning !!! " );
        HelloWorldSNMP app = new HelloWorldSNMP();
        System.out.println( " Just finished !!!" );   
                                        
    }    
}


_________________________________________________________
Do You Yahoo!?
Información de Estados Unidos y América Latina, en Yahoo! Noticias.
Visítanos en http://noticias.espanol.yahoo.com