The UART communication seems to be very Easy but I think I am missing an important point.
There is no data on your module at the page you linked to.
I also found out that the UART communication is probably easier to build and code.So I choose to do it as simple as it can be and to do it using UART communication.
So your choice is now a "more complicated" 4-wire instead of 2-wire connection, or going through the effort of writing your own library.I'd go for the two extra wires.Don't forget the level shifters.
I am quite lost right now ...So what would you do in my shoes ?
I thought that this kind of module was "generic" and that some librairies can work also on all of them. Am I wrong?
Have you found a library or even the full data on the module ?