SteamVR 2.18.1 quietly changed the driver interfaces third-party add-ons use

T2Covered by 1 source · first reported by UploadVR / Road to VR / MIXED at 26 Sept, 23:17 UTC

SteamVR's 2.18.1 beta changed several of the interfaces third-party drivers build against, and it changed the OSC output that the Steam Link driver exposes. Neither appears in Valve's notes for the beta, and the company set them out only in a reply to an owner whose paid SteamVR add-on had stopped…