Redfish gives richer, better-typed hardware data than SNMP on newer iDRAC firmware. Here's when to use it and how to point Linivo at it.
Redfish runs over standard HTTPS on the iDRAC's management IP, no separate service to enable. Confirm it responds before configuring Linivo.
curl -k https://10.20.0.15/redfish/v1/Systems/System.Embedded.1
Use a dedicated local iDRAC user with the minimum required privilege (Login + basic read) rather than reusing the main administrator account for polling.
In Devices > Add device, choose Redfish instead of SNMP and supply the account credentials. Redfish exposes typed fields (drive wear level, PSU redundancy state) that SNMP's generic hardware MIB doesn't always carry consistently across firmware versions.