[SNMP4J] Help for setting up OIDs that change values

[Frank Fock]

Hi Andrew,
The first thing to fix is using .0 as suffix for scalar managed objects (you name those "OIDs" which is not fully appropriate). The lookup mechanism of SNMP4J-Agent relies on this SNMP standard requirement. 
The most easiest way to instrument a scalar managed object is to overwrite its setValue method. 
I probably can add more pointers if you have tried the above.

Best regards,
Frank

> Am 09.09.2015 um 15:04 schrieb Andrew Samuels <drewsamuels13 at gmail.com>:
> 
> All,
> 
> I have been looking at using SNMP4J for a while and finally started to get
> to grips with it, however setting up OIDs that can return changing values
> is proving more challenging than I anticipated and I am looking for
> pointers. I have read the instrumentation guide and pulled various pieces
> of code together from searching.
> 
> So far I have the basics working, various examples show these
> 
> // Set up a new agent
> this.myAgent = new SNMPAgent("udp:10.0.0.5/161");
> 
> // Start the agent
> this.myAgent.start();
> // Remove all the default MIBs so I can see any additions/changes I am
> making more easily.
> myAgent.unregisterManagedObject(myAgent.getSnmpv2MIB());
> myAgent.unregisterManagedObject(myAgent.getSnmp4jLogMIB());
> myAgent.unregisterManagedObject(myAgent.getSnmpCommunityMIB());
> myAgent.unregisterManagedObject(myAgent.getSnmp4jConfigMIB());
> myAgent.unregisterManagedObject(myAgent.getSnmpFrameworkMIB());
> myAgent.unregisterManagedObject(myAgent.getSnmpNotificationMIB());
> myAgent.unregisterManagedObject(myAgent.getUsmMIB());
> myAgent.unregisterManagedObject(myAgent.getVacmMIB());
> myAgent.unregisterManagedObject(myAgent.getSnmpProxyMIB());
> myAgent.unregisterManagedObject(myAgent.getSnmpTargetMIB());
> 
> //Add a simple OID with string
> 
> OID mo1= new OID("1.3.6.1.2.1.1.1");
> myAgent.registerManagedObject(MOCreator.createReadOnly(mo1,"this is my
> test"));
> 
> If I start the agent and then do a walk
> 
> snmpwalk -v 2c -c public 10.0.0.5 .1
> iso.3.6.1.2.1.1.1 = STRING: "this is my test"
> iso.3.6.1.2.1.1.1 = No more variables left in this MIB View (It is past the
> end of the MIB tree)
> 
> I get back what I expected and everything is good, so I know the agent
> starts, community is working etc.
> 
> The next step I unfortunately do not seem to be able to get working at all.
> 
> Lets say I have a class call Kitchen and an instance of the class called
> ThisKitchen. It has the following return methods
> 
> getStaffOnDuty() - returns string
> getSpoonCount() - returns int
> getKnifeCount() - returns int
> getForkCount() - returns int
> 
> These values can be updated in the ThisKitchen instance with comparable set
> calls ,so setStaffOnDuty, setSpoonCount etc
> 
> I have tried using a MOServerLookupListener and MOTable and also the
> class UpdatableManagedObject,
> however the MOTable I obviously do not yet understand fully and the
> UpdateableManagedObject always returns null for the oid I set up.
> 
> A simple oid structure (fake prefix) I am looking for would be
> 
> 1.8.8.8.1 = staffonduty - string
> 1.8.8.8.2 = spooncount - int
> 1.8.8.8.3 = knifecount - int
> 1.8.8.8.4 = forkcount - int
> 
> Can any one provide some pointers, not looking for complete code (although
> very welcome), but some basic framework pointers that aligns with what I am
> trying to do ? as I believe my current approach is missing some
> fundamentals for OIDs that change values and how the structures work.
> 
> 
> Andrew.
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