[SNMP4J] I loose the response PDU with asynchronous send method

[Frank Fock]

Hi Rodolfo,

Have you tried to increase the timeout value for your target yet?
It seems that the agent's response is received too late (the timeout
has already removed the corresponding request object).

Best regards,
Frank

Rodolfo Josÿffffe9 Castellanos Jaimes wrote:

>Hi friends.
>
>I have the following code to send a GET PDU to
>localhost. I'm testing with asynchronous methods.
>
>This is the code of the method that I use to send the
>PDU (I'm guiding me by the snmp4j_tool console app.
>source code and some others that I've written):
>
>///////////
>
>public void send()
>{
>  try
>  {
>    this.target = createTarget();
>    target.setVersion( snmpVersion );
>    target.setAddress( targetAddress );
>    target.setRetries( maxRetries );
>    target.setTimeout( timeout );
>		
>    Snmp snmp = createSnmpSession();
>    snmp.listen();
>		
>    // create the request PDU
>    PDU requestPDU = createPDU( target );
>
>    if ( requestPDU.getType() == PDU.GETBULK )
>    {		
>    }
>    for ( int i=0; i < variableBindingsVector.size();
>i++)
>    {
>      // add the variables that will be requested
>      requestPDU.add( variableBindingsVector.get( i )
>);
>    }
>    // the listener that will "listen" the response
>PDU
>    ResponseListener responseListener =
>createResponseListener();
>    // send the PDU
>    snmp.send(requestPDU, target , null,
>responseListener);
>  }
>  catch( IOException ioe )
>  {
>  }
>} // end method send
>
>///////////
>
>Then, I compile and run a test application that
>request some variables within the MIB-II System group.
>
>When I run it, sometimes I get the response PDU (which
>I process to produce some output) but sometimes I get
>no answer. 
>
>Here I show you two samples of differents outputs. I
>put the Logger Level to Level.ALL with the aim of see
>what could be hapenning. These outputs are produced by
>the same code, in the same machine, with the same
>packages of SNMP4J and Log4J.
>
>/////  1) Not successful for me
>[rodolfojcj at gandalf testPrograms]$ java -cp
>.:lib/SNMP4J.jar:lib/log4j-1.2.7.jar 
>ProgramWithSnmp4J
>Se ha creado la vista
>Se ha agregado el PduListener
>0 [main] DEBUG org.snmp4j.security.Salt  - Initialized
>Salt to 1c9c18862b9d60ca.
>85 [Thread-1] INFO
>org.snmp4j.transport.DefaultUdpTransportMapping  - UDP
>receive buffer size for socket 150.187.64.101/0 is set
>to: 32767
>163 [main] DEBUG
>org.snmp4j.transport.DefaultUdpTransportMapping  -
>Sending message to 150.187.64.101/161 with length 43:
>30:29:02:01:00:04:06:70:75:62:6c:69:63:a0:1c:02:04:0c:1b:6c:9e:02:01:00:02:01:00:30:0e:30:0c:06:08:2b:06:01:02:01:01:03:00:05:00165
>[Thread-1] DEBUG
>org.snmp4j.transport.DefaultUdpTransportMapping  -
>Received message from
>gandalf.unet.edu.ve/150.187.64.101/161 with length 46:
>30:2c:02:01:00:04:06:70:75:62:6c:69:63:a2:1f:02:04:0c:1b:6c:9e:02:01:00:02:01:00:30:11:30:0f:06:08:2b:06:01:02:01:01:03:00:43:03:02:51:81
>170 [main] DEBUG org.snmp4j.Snmp  - New pending async
>request with handle PduHandle[203123870]
>
>////
>
>////  2) Successful for me !!!
>[rodolfojcj at gandalf testPrograms]$ java -cp
>.:lib/SNMP4J.jar:lib/log4j-1.2.7.jar 
>ProgramWithSnmp4J
>Se ha creado la vista
>Se ha agregado el PduListener
>0 [main] DEBUG org.snmp4j.security.Salt  - Initialized
>Salt to 57d7e9f873b504dd.
>67 [Thread-1] INFO
>org.snmp4j.transport.DefaultUdpTransportMapping  - UDP
>receive buffer size for socket 150.187.64.101/0 is set
>to: 32767
>79 [main] DEBUG
>org.snmp4j.transport.DefaultUdpTransportMapping  -
>Sending message to 150.187.64.101/161 with length 43:
>30:29:02:01:00:04:06:70:75:62:6c:69:63:a0:1c:02:04:60:ae:54:67:02:01:00:02:01:00:30:0e:30:0c:06:08:2b:06:01:02:01:01:03:00:05:00
>180 [Thread-1] DEBUG
>org.snmp4j.transport.DefaultUdpTransportMapping  -
>Received message from
>gandalf.unet.edu.ve/150.187.64.101/161 with length 45:
>30:2b:02:01:00:04:06:70:75:62:6c:69:63:a2:1e:02:04:60:ae:54:67:02:01:00:02:01:00:30:10:30:0e:06:08:2b:06:01:02:01:01:03:00:43:02:11:d1
>277 [main] DEBUG org.snmp4j.Snmp  - New pending async
>request with handle PduHandle[1622037607]
>279 [Thread-1] DEBUG org.snmp4j.Snmp  - Removing
>pending request with handle PduHandle[1622037607]
>309 [Thread-1] DEBUG org.snmp4j.Snmp  - Removing
>pending request with handle PduHandle[1622037607]
>Adding 1 (oid, value) pairs
>Se ha recibido el evento pduArrived...
> 
> 
>        Error Index = 0
>        Error Status = 0
>        Error Status Text = Success
>        PDU Type Number = -94
>        PDU Type String = RESPONSE
>        OID = Value ...
>                 There are 1 responsed variables
>                1.3.6.1.2.1.1.3.0 = 0:00:45.61
>////
>
>Well, that's all.
>I hope you can help me.
>
>Thanks in advance by your time and your help.
>
>Rodolfo José Castellanos Jaimes.
>
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