Update:

Updated the RetroPie-Setup script and all OS packages and restarted the Pi. This got the Bluetooth to connect (unreliably, it still fails to register about 1/4 of the button pushes I make). Frame rates are still very poor but I think that might just be the state of RetroPie on Pi 4 at the moment.

But... if you're trying to just prevent the message from appearing when you don't have a controller available, the easiest solution is to configure a keyboard as input in EmulationStation. When started, even if there's no controller connected, EmulationStation will skip the welcome message and go right into the system list.

THX!
It looks like there was a hidden sign (copy and paste failure)

@Dinsdale Your screenshot shows an error that happens during pairing in the Bluetooth setup - possibly a timeout during the process. Re-connection is handled by the OS, there's no RetroPie script involved afterwards - so I don't think that's the problem.

EDIT: you can try and pair the controller manually - see https://approxeng.github.io/approxeng.input/bluetooth.html, the Pairing with Bluetoothctl section).

Press Start to open the Emulationstation menu, then use the Input Configuration entry to re-configure your controller.

Amazing! This did the job!

@a4c8 said in NES30 found but can't connect (details inside):

I can start emulationstation afterwards, configure the controller and run games, but after restart they aren't solid anymore and blink instead. I tried setting the mode to boot or background, as described, but with no change.

I get the same behaviour with another model, they don't re-pair automatically if you restart RetroPie without shutting them down first. If you restart RetroPie, shutdown the controller and then start it up again, they should re-pair and the light will turn solid.

@backstander

I noticed the same thing, in the switch mode I had ghost movements and it all went away when I put the gamepad in windows mode.

I went a slightly different route with mine. I went for a thin build: INITIAL IDEA= firstidea.png and HALF DONE= halfdone.jpg.

Please add more info about your setup, as detailed in https://retropie.org.uk/forum/topic/3/read-this-first.

Yes, it's possible - see the docs on how to pair and connect them

@mitu Thanks for the info. Sorry for jumping in. My brain didn't register that this was a RPi4 specific thread. FWIW, Turns out my issue was xpadneo README's instructions for raspbian. Installing the raspberrypi-kernel-headers package on 4.5.1 causes the buster headers to be installed on top of the stretch ones (which are already present on the retropie image).

I don't have a HDD attached at this time. I won't until Kodi is operational on the Pi 4. I had to use the manual set up to get emulationstation up and running. I am not sure it fully took. I looked under "retroarch" in the menu and see no core, even after I have installed cores.

You should try out the xpadneo driver: https://github.com/atar-axis/xpadneo

see the section under install. This is specifically designed to work with the bluetooth xbox one controller model 1708.

@pikey

first off, its worth noting that you need to install a driver for the ps3 controller to connect, so if you havent done that yet, i sugest you try that first, via the retropie setup.
also linux is not windows, so the fact that it works in windows, dosnt automaticly mean it also works in linux.

does the bluetooth adapter work as expected with other bluetooth devices in linux?

edit:
also, are you using an original controller?

@matchaman Ah, I misunderstood the concurrently part. I don't think it's possible from within the emulator, but maybe something external to combine the 2 inputs into 1 virtual gamepad (like xboxdrv ).