Net-SNMP library supports some OPAQUE value types which is not supported in zabbix, for example there is no mention of ASN_OPAQUE.

Since we have pre-processing, we could handle pure OPAQUE values as text and let users convert them if needed

Coming from: https://www.zabbix.com/forum/zabbix-troubleshooting-and-problems/408537-snmp-value-has-unknown-type-0x44