[SNMP4J] The method snmp.send() returns a null ResponseEvent, why?

[vikas kumar]

Hi,

In case I use TcpTransportMapping and a TCPAddress, what would be the
best way of confirming that the trap has reached the intended target?
Doing a snmp.close() before the trap is sent out completely results in
the trap not being received at the other end..
And not doing a snmp.close() in a threaded environment leads to too
many open sessions.

Am I going down the wrong path or missing something here??

Regards,
~Vikas


On 2/21/07, Frank Fock <fock at agentpp.com> wrote:
> Hi,
>
> A TRAP PDU is not confirmed, so there will be
> never a response and therefore the response is
> null and everything is fine as it should be.
>
> Best regards,
> Frank
>
> xsong at profilium.com wrote:
> > Hi,
> >
> > I just started to write code for SNMP, I found SNMP4j is very help. The following code trys to send out a TRAP pdu, but it does not work. Debug finds that everythings is find until the snmp.send() is called, the method is supposed to returns a ResponseEvent, but it returns null.
> >
> > .............
> > // set up a default SNMP session for UDP and with SNMPv3 support
> > TransportMapping udpTransport = new DefaultUdpTransportMapping();
> > Snmp snmp = new Snmp(udpTransport);
> > USM usm = new USM(SecurityProtocols.getInstance(),
> >                  new OctetString(MPv3.createLocalEngineID()), 0);
> > SecurityModels.getInstance().addSecurityModel(usm);
> >
> > // set up the target
> > Address targetAddress = GenericAddress.parse("udp:192.168.1.156/162");
> > CommunityTarget target = new CommunityTarget();
> > target.setCommunity(new OctetString("public"));
> > target.setAddress(targetAddress);
> > target.setRetries(2);
> > target.setTimeout(1500);
> > target.setVersion(SnmpConstants.version2c);
> >
> > // create a SNMP trap PDU
> > PDU trapPdu = new PDU();
> > trapPdu.add(new VariableBinding(new OID("1.3.6.1.2.1.1.1"),
> >           new OctetString("Alarm 1")));
> > trapPdu.add(new VariableBinding(new OID("1.3.6.1.2.1.2.1"),
> >             new OctetString("Alarm 2")));
> > trapPdu.setType(PDU.TRAP);
> >
> > // sending out the SNMP trap PDU synchronously
> > ResponseEvent response = snmp.send(trapPdu, target);
> > if (response.getResponse() == null) {
> >     System.out.println("sending request timed out");
> > }
> > else {
> >     System.out.println("Received response from "
> >                         +response.getPeerAddress());
> >     // dump response PDU
> >     System.out.println(response.getResponse().toString());
> > };
> > ...............
> >
> > I traced the inside steps of the snmp.send(), it seems everything is fine there: the pdu message is encoded, written to the buffer, and sent out a socket. Could anyone tell me what is wrong with my code?
> >
> > Thanks...
> >
> > Xinxin
> > _______________________________________________
> > SNMP4J mailing list
> > SNMP4J at agentpp.org
> > http://lists.agentpp.org/mailman/listinfo/snmp4j
>
> --
> AGENT++
> http://www.agentpp.com
> http://www.mibexplorer.com
> http://www.mibdesigner.com
>
> _______________________________________________
> SNMP4J mailing list
> SNMP4J at agentpp.org
> http://lists.agentpp.org/mailman/listinfo/snmp4j
>