[SNMP4J] Detect the receiving SNMP Message

[Andrew Chan]

Hi Frank,
  Amm... I tried the following but the same timeout problem happen
  to simplify the case, I modify my code as follow (BTW, I use SNMP v1)
  public synchronized void processPdu(CommandResponderEvent e) {
PDU command = e.getPDU();
if (command != null) {
MessageDispatcher md = e.getMessageDispatcher();
 md.returnResponsePdu(e.getMessageProcessingModel(), e.getSecurityModel(),
e.getSecurityName(), e.getSecurityLevel(), command, e.getMaxSizeResponsePDU(),
e.getStateReference(), null);
  }
 }
  Just in case you think might be the sender's problem, I also include the
code (simplified) here FYI

private static void sendTestSnmp()
{
CommunityTarget target = createCommunityTarget();

try {
PDU pdu = new PDU();
pdu.add(new VariableBinding(MY_OID));

pdu.setType(PDU.GET);

Snmp snmp = new Snmp(new DefaultUdpTransportMapping());

ResponseEvent response = snmp.send(pdu, target);
if (response.getResponse() == null) {
// request timed out
System.out.println("Request " + pdu + " timed out");
}
else {
System.out.println("Received response from: "+
response.getPeerAddress());
// dump response PDU
System.out.println(response.getResponse().toString());
}
} catch (Exception e) {
e.printStackTrace();
}

}



 On 9/27/05, Frank Fock <fock at agentpp.com> wrote:
>
> OK, to send a response it would be more straight forward to use
> the MessageDispatcher.returnResponsePdu(..) method directly.
>
> Best regards,
> Frank
>
> Andrew Chan wrote:
>
> > Hi Frank,
> >
> > I did, actually below are what I set for the repond pdu.
> >
> > public synchronized void processPdu(CommandResponderEvent e) {
> > PDU command = e.getPDU();
> > sendRespond(e, command);
> > }
> >
> > private void sendRespond(CommandResponderEvent e, PDU command)
> > {
> > CommunityTarget target = createCommunityTarget(e.getPeerAddress());
> >
> > PDU pdu = new PDU();
> > pdu.add(new VariableBinding(new OID(My_OID), variable)); //please
> > assume MY_OID and the variable has been set somewhere
> > pdu.setType(PDU.RESPONSE); //Here I set the PDU type to RESPOND
> > pdu.setRequestID(command.getRequestID()); //Here I set the Request ID
> >
> > //Snmp snmp = new Snmp(new DefaultUdpTransportMapping());
> > Snmp snmp = new Snmp(e.getTransportMapping()); //I even set the
> > TransportMapping
> >
> > snmp.send(pdu, target);
> > }
> >
> > private CommunityTarget createCommunityTarget(Address addr)
> > {
> > CommunityTarget target = new CommunityTarget();
> > target.setCommunity(new OctetString("public"));
> > target.setAddress(addr);
> > target.setVersion(SnmpConstants.version1);
> >
> > return target;
> > }
> >
> > Do you have any idea? Thanks.
> >
> > Regards,
> > Andrew
> >
> >
> >
> > On 9/27/05, *Frank Fock* <fock at agentpp.com <mailto:fock at agentpp.com>>
> > wrote:
> >
> > You need probably to set the request ID of the response PDU to the
> > request
> > ID you received.
> >
> > Best regards,
> > Frank
> >
> > Andrew Chan wrote:
> >
> > > Thanks Frank,
> > >
> > > May I ask one more question? After I have recieved the SNMP
> > Message,
> > > I should construct an respond, right how do I do that? I try
> > this by
> > > sending a PDU.RESPOND type pdu to the
> > > CommandResponderEvent.getPeerAddress(), but the manager always got a
> > > time out error, do you have any idea? Many thanks.
> > >
> > > Regards,
> > > AC
> > >
> > >
> > > On 9/27/05, *Frank Fock* <fock at agentpp.com
> > <mailto:fock at agentpp.com> <mailto:fock at agentpp.com
> > <mailto:fock at agentpp.com>>>
> > > wrote:
> > >
> > > Hi Andrew,
> > >
> > > Just call CommandResponderEvent.getMessageProcessingModel() and
> > > you will
> > > get the SNMP version.
> > >
> > > Best regards,
> > > Frank
> > >
> > > Andrew Chan wrote:
> > >
> > > >Dear all,
> > > > I am trying to writing code to receive SNMP request, I
> > know how
> > > to write
> > > >it by referencing the example in Package org.snmp4j.
> > However, how
> > > do we know
> > > >the SNMP version (v1, v2c or v3) of incoming message?
> > > > What I am expecting is to get the "target" from the
> > > CommandResponderEvent,
> > > >but seems this is not the case.
> > > > Am I doing something wrong?
> > > > Thanks.
> > > >AC
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> > > >
> > >
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