Thank you for posting your query in Wired Ethernet Communities.
Kindly refer to the links related to Intel Sideband Technology and NC-SI for your reference.
if you already have a system on hand, please contact the system manufacturer for custom firmware or application that utilizes BMC and network controller for out of band manageability.
I'm currently checking on the information regarding your query about library and sample codes available in case you'll be programming to the i210 directly.
sharing the link below containing sample application to utilize the feature of i210, please check if it will be helpful to your development. Let us know if you need additional assistance.