Just answering my own questions here :-( 

the only software learn functionality is the ‘writeLearn(int)’ API function, but it only applies to the object recognition. So the answer to my original post is…

No. 

Im fearing that this could have been a rhetorical question to myself. I don’t think it programmatically supports the ‘learn’ of pushing the physical button. I think I’m going to have to switch over to the m5stack V2 AI camera as this has a much better source programming interface. Shame as I do like the Huskycam unit for its speed and display, I just think it does fall down on its API.

Does anyone actually have a document on the complete API available with byte sequences forward and return please? Are there some other hidden byte sequence commands available? Perhaps for example to turn off the display to save energy etc.

I can only find reference to the libraries.

I've now even tried debugging why it sends back failure and still can't glean any reasoning? I do notice that the last command it sent before failure was the ‘INFO’ 41 0x29.