I'm involved in development of a motorized rotation system for an existing dome which is intended to support automated operation. Initially at least, the shutter will be operated manually at the beginning and end of an observing session. Since we have full flexibility to define the command set for dome control, it has been suggested that we conform to an existing protocol rather than develop our own. This would be along the lines of Losmandy and Astro-Physics implementations of the Meade LX200 command sets for support of basic operations of their mounts. With an eye toward the possibility that we may eventually add shutter control, it would be useful to know if anyone can recommend an existing dome control protocol which is both openly documented and currently supported by an INDI driver. Our goal is to use that driver for our dome without any need for modification.
You may want to post this question in the software forum at Stargazer's Lounge. I don't know if the lead developer for oaCapture monitors this forum, but he is quite responsive to questions posted at SGL.