Hi Udara,
I admire your dedication to doing things the hard way, but in your position, if I was unable to emulate the remote signals, I would just remove the PCB from the remote you have, emulate button presses, and wrap the whole thing up in a nice enclosure.
I’d take a look at Liam’s excellent post on the matter:
If that doesn’t do it for you, we can dig deeper into the radio side of things. My suspicion is either of those libraries isn’t working as you expect, or the Dooya blinds have some kind of incrementing code or something like that.
