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You have to have setup a couple of configuration files, or rather UAT's, for this. Easiest to do that through Wireshark. They can be found under Name Resolution, and the SNMP dissector preferences. Or you can use the UAT override option -o "uat:<UAT>:\" ... \"", see the manual

The UAT's are smi_paths, smi_modules and snap_users

The first one contains the path(s) to the MIB files,
The second one contains the names of the MIBs to load,
The third one contains the authentication and encryption information.

Once these are filled with the right information for your setup, in the right format, the PDU's can be decrypted and contents parsed. As said, the format is written by Wireshark, so be far the easiest to get stated.