For reasons I don't understand, I believe the serial protocol used to talk to the modules is held under a non-disclosure agreement. Why? I have absolutely no idea, I have been working in the electronics and control industry for over 25 years and can't quite grasp this. I can understand if the protocol somehow contained IPR that SF had some value in it but it does not.
Maybe another Chinese company wants to either copy or produce their own module? In this case, a company who can do that can also reverse engineer the serial protocol in about one week... maximum.
The protocol for the Venice 5 module (in slave mode) was skillfully reverse engineered and this is what we use to control it. If the firmware for the Venice 7 is compatible with the Venice 5, then it probably will work except there will be some Venice 7 bits that need to be handled. All of which brings you round to the first problem that you need to know the protocol and this is under an NDA (I guess).
Strange. My uptake is that I never even heard of SF before and now in several months hundreds of people have, they are impressed with the company, they want their products and if they are on the high-street they will probably be influenced in their purchases knowing a device has an SF module in it. I wish I had a business like that...