[SNMP4J] Detect the receiving SNMP Message

[Frank Fock]

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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