SNMP stuff

[Dietmar Schäfer]

Hi !


Some (much) more questions concerning SNMP and Erlang.


I have a MIB (V1) containing a variable mibversion  type DisplayString


I made a mnesia table

-record(all_mib_variables,{mibversion}).

I wrote a .funcs file
{all_mib_variables,{instrumentation,mibversion,[]}}.


And I wrote an instrumentation function instrumentation.erl


   mibversion(get) ->
	Version = "Version-0-1",
   {value,Version}.

just to see what happens.



So, if I got it right  any snmp-get-request causes a call to 
instrumenation:mibversion(get)  ????


Yes ! (?)



The valid return value for such an instrumentation function would be

{value,"Version-1.0") for example ??

So, instead of asking the database I should be able to it as i did ??


But why do I get :

User error: Got
{'EXIT',{undef,[{instrumentation,mibversion,[get]},{snmp_agent,try_get_instance,2},{snmp_agent,next_loop_varbinds,5},{snmp_agent,process_pdu,4},{snmp_agent,handle_pdu,7},{snmp_agent,handle_info,2},{gen_server,handle_msg,6},{proc_lib,init_p,5}]}} from {instrumentation,mibversion,[]}. ({asn1_type,'INTEGER',undefined,undefined,[{enums,[{inactive,2},{active,1}]}],true,'INTEGER',false}) Using genErr
 




How would such an instrumenation function look like if i use a database
query ?

Can I use Mnemosyne ?


Any moer hints about SNMP under Erlang would be appreciated !


Thanks in advance !



Dietmar