SNMP version 3 supports secure communication. Unlike SNMP v1 and v2, it uses username/password authentication and SSL encryption.
SNMP version 3 is designed for secure management of networks with many devices. Typical applications include infrastructure monitoring (including the signal quality of microwave links, disk space on servers, battery states in UPS units, etc.).
Related: SNMP v1 / v2
MIB file is download available: MIB
NETIO specification of the SNMP M2M protocol: Download page