How to solve the problem with binding the keyboard to the software?

Question

Do it yourself

A keyboard will be made to order and software will be written for it. It needs to work through microusb-out -> USB-in and be configured through software for each system. The main task is to make the software work under windows, mac, linux & android, or rather, be written for each of these systems in one language. The keys will be programmed for specific tasks and the software will most likely be improved and updated.
How to solve this problem correctly?

Answer 1

QT

Answer 2

the simplest option is a microcontroller on the keyboard, it can already be programmed as you like, connected to a PC via a usb ttl adapter. The software on the PC will read from the COM port what the microcontroller tells it to and, depending on the command received, will emulate a keystroke.

Answer 3

I can’t understand one thing, do you write a driver to make the keyboard work or software so that you can configure it?

Answer 4

Since everything will be from scratch, both will need to be done.