Hi,
I probably miss a keypoint because after reading carefully wiki HOW-TO:Configure_controllers and a bunches of threads, I've never ever been able to play a single game on Kodi with retroArch 
I can bind my wiimote and navigate throug Kodi : it works like a charm. But when I want to open a game via Retroarch, the game open, but I'm not able to send a single command to try to play.
I was expecting, after some releases, to see a controller profiles called "Wiimote", or to see a hint how to create such a profile, but I failed until now.
I've tried do configure the NES profile to play some NES game, but I'm not able to set a single buttons : the countdown goes down from 4 to 0 and no button is mapped.
I've tried to use the add-on "Keymap" and achive to map any button of my weemote to some navigation controls, and it works with kodi navigation, but it doesn't help for interacting with retroarch (did I miss a section in keyma?).
Each time a game is running, if I press "A" on my wiimote, I see the pop-up with options to resume, change control, change video size, ... but if kodi can receive orders from my wiimote, why Retroarch is not reacting?
I'll never give up and still hope playing my old dream "Bionic Comando" on NES emulation.
Any direction on what to check on hints would be greatly appreciated 
2020-03-30 21:25:17.907 T:140072198809728 NOTICE: -----------------------------------------------------------------------
2020-03-30 21:25:17.907 T:140072198809728 NOTICE: Starting Kodi (18.6 Git:18.6-Leia). Platform: Linux x86 64-bit
2020-03-30 21:25:17.907 T:140072198809728 NOTICE: Using Release Kodi x64 build
2020-03-30 21:25:17.907 T:140072198809728 NOTICE: Kodi compiled 2020-03-03 by GCC 8.3.0 for Linux x86 64-bit version 5.1.16 (327952)
2020-03-30 21:25:17.907 T:140072198809728 NOTICE: Running on LibreELEC (official): 9.2.1, kernel: Linux x86 64-bit version 5.1.16
2020-03-30 21:25:17.907 T:140072198809728 NOTICE: FFmpeg version/source: 4.0.4-Kodi
2020-03-30 21:25:17.907 T:140072198809728 NOTICE: Host CPU: Intel(R) Core(TM) i5-6260U CPU @ 1.80GHz, 4 cores available
[...] (no special errors there)
2020-03-30 21:25:18.564 T:140072198809728 NOTICE: initialize done
2020-03-30 21:25:18.565 T:140072198809728 NOTICE: Running the application...
2020-03-30 21:25:18.567 T:140072198809728 NOTICE: starting zeroconf publishing
2020-03-30 21:25:18.567 T:140072198809728 NOTICE: CWebServer[8080]: Started
2020-03-30 21:25:18.571 T:140071516739328 NOTICE: ES: Starting UDP Event server on port 9777
2020-03-30 21:25:18.571 T:140071516739328 NOTICE: UDP: Listening on port 9777 (ipv6 : false)Thank's for paying some attention and wish you a nice day 
Fred