Help needed/Known issues:

Encrypted keystrokes work only on C-U0007 dongles with firmware 012.001.00019 and prior, dongles on 012.010.00032 are rejecting these keystrokes
- If you can help, see bilogic#1

Library to build Logitech Unifying compatible devices

I have always wanted an 84 key standard layout, wireless, mechanical keyboard with RGB backlight and rotary knobs plus media control buttons near the spacebar. Anyway, it did not take long for me to realize that bluetooth keyboards are notoriously unreliable, intermittently disconnecting every so often. However, Unifying ones are much better.

I never planned to publish this code, thus it is not the cleanest. But since I'm stuck, I thought someone might put it to good use and maybe figure out the problem. If you can make a more secured Unifying compatible protocol, all the better.

Many thanks to:

Ronan Gaillard ronangaillard/logitech-mouse#5
RoganDawes and Marcus Meng RoganDawes/LOGITacker#55
Code to perform AES ECB mode, will gladly attribute it if someone knows its origin

Compatibility

Keystrokes A-Z working up to 012.010.00019
Keystrokes A-Z not working for 012.010.00032
Keystrokes A-Z not working for 024.001.00023

Hardware

Logitech C-U0007 dongle with firmware 012.001.00019, dongles with newer firmware are doing something to reject our keystrokes.
ESP8266, NRF24L01+ and a 5v power board for the NRF24L01+ module, connect them as follows:
- WEMOS D1 mini D3 <-> power board CS
- WEMOS D1 mini D4 <-> power board CE
- WEMOS D1 mini D5 <-> power board SCK
- WEMOS D1 mini D6 <-> power board MISO
- WEMOS D1 mini D7 <-> power board MOSI
- WEMOS D1 mini 5V <-> power board VCC
- WEMOS D1 mini GND <-> power board GND

Software

Open logitech-unifying-device.code-workspace in VSCode with PlatformIO installed
Press ctrl + alt + u to compile
If it is your first time using PlatformIO, wait until the icon appears on the activity bar at the left of VSCode before compiling, it should just work