Difference between ASN_OPAQUE and ASN_OCTET_STR? (except for the display)

Hello all,

I've a question concerning the type ASN_OPAQUE. In my SNMP "server" I 
want to offer a "counter" which actually holds some binary data with 
reasonable size (up to 100 bytes or so).
I don't (and don't want to) use any MIB module files, but just register 
a callback for my counter.

When my callback gets called (when 'snmpwalk/get' is issued), I call 
(beyond others):

snmp_set_var_typed_value( [variable_binding], ASN_OPAQUE, data, len );

data is a void* to my data, len is its length.

When the datatype is ASN_OCTET_STR this works very good. There's no need 
to free any additional data, no memory leaks occur. I just have to 
handle my own data. (Sometimes it's not clear which 
snmp_free()-functions have to be called in addition. That's not the case 
for ASN_OCTET_STR.)

The question is: Does this also apply to the type ASN_OPAQUE, i.e. can I 
safely interchange the types ASN_OCTET_STR and ASN_OPAQUE?
Do they have the very same behaviour regarding memory handling and 
differ only in the type? That would be great for my purpose.

Thanks in advance,

     -- Dirk

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