There seems to be a difference between some ASN types in both asn1.h and
snmp_impl.h.
asn1.h
/*
* value for Float
*/
#define ASN_OPAQUE_FLOAT (ASN_OPAQUE_TAG2 + ASN_APP_FLOAT)
/*
* value for Double
*/
#define ASN_OPAQUE_DOUBLE (ASN_OPAQUE_TAG2 + ASN_APP_DOUBLE)
/*
* value for Integer64
*/
#define ASN_OPAQUE_I64 (ASN_OPAQUE_TAG2 + ASN_APP_I64)
/*
* value for Unsigned64
*/
#define ASN_OPAQUE_U64 (ASN_OPAQUE_TAG2 + ASN_APP_U64)
snmp_impl.h
#ifdef NETSNMP_WITH_OPAQUE_SPECIAL_TYPES
/*
* defined types from draft-perkins-opaque-01.txt
*/
#define ASN_FLOAT (ASN_APPLICATION | 8)
#define ASN_DOUBLE (ASN_APPLICATION | 9)
#define ASN_INTEGER64 (ASN_APPLICATION | 10)
#define ASN_UNSIGNED64 (ASN_APPLICATION | 11)
#endif /* NETSNMP_WITH_OPAQUE_SPECIAL_TYPES */
I'm also unsure what to use for unsigned integer32:
#define ASN_UNSIGNED (ASN_APPLICATION | 2) /* RFC 1902 - same as GAUGE */
#define ASN_UINTEGER (ASN_APPLICATION | 7) /* historic - don't use */
Wes Hardaker:
"Generally, you should never use OPAQUEs."
http://www.mail-archive.com/net-snmp-users@lists.sourceforge.net/msg16519.html
Dave Shield:
"If you want it to work, use ASN_OPAQUE_FLOAT.
If you're not bothered, use ASN_FLOAT"
http://www.mail-archive.com/net-snmp-users@lists.sourceforge.net/msg17253.html
Wes Hardaker:
"ASN_FLOAT is not a legal SNMP data type. ASN_OPAQUE_FLOAT encodes a
float in a way that is legal for encoding in SNMP packets. Note,
however, that Net-SNMP is likely the only package that supports them."
http://www.mail-archive.com/net-snmp-users@lists.sourceforge.net/msg17266.html
Using ASN_OPAQUE_DOUBLE always outputs the value as "Opaque: Float: ". Because
of this, my values of type double are shortened. A longitude value of
69.2457534806943 gets shorten down to 69.245753. How can I avoid this?
I tried using the ASN types ASN_INTEGER64, ASN_FLOAT and ASN_DOUBLE, but got
SNMP error "Internal error in type switching".
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