How to develop an OPC Xi (WCF) Server |Classic OPC: DA, A&E, HDA, XML-DA, etc.|Forum|OPC Foundation

Hi everyone,

I am working on a project that requires me to implement an OPC Xi server to maintain compatibility with a legacy client.

I have been searching for the original OPC Xi Reference Implementation, SDK, or Compliance Test Tool binaries, but as these were deprecated years ago, I am unable to find any functional links or repositories.

Does anyone happen to have an archive of these legacy OPC Foundation OPC Xi resources (circa 2010–2012)? Even if the code is outdated, having the reference implementation would be incredibly helpful for debugging my current attempt at a server implementation.

Any leads or pointers on how to actually target this standard would be greatly appreciated.

Thank you for your time and help.