We have an ongoing discussion on that in the topic about a new DS3 driver:

https://retropie.org.uk/forum/topic/15967/sony-dualshock-3-call-for-testers-sixaxis-script-module/129

You may want to give this driver a try and remap your controller in Steam Link even if it already is supported - mine was but it had digital triggers, I remapped and triggers became properly analog!

Do note that this may not work for libretro cores just because as far as I can tell, no platform emulated on RetroPie supports analog triggers (L2/R2 buttons were digital on PSX).

thanks Cyberghost. Jumped over to your suggested thread and giving that a shot.

@steeeb I've tried that. I've actually tried all 4 possible drivers and none of them seem to work for any of the three generic controllers. For each driver, I do the same thing:

First, install the driver. I choose the "Pair" option for the respective driver. The dialog pops up to connect the controller through USB. I connect the controller for around 10s, and then disconnect it. I then press the PS button on the controller and.... The lights just flash repeatedly and none of them become solid, meaning that the controller wasn't able to connect.

I've probably tried the Shanwan driver the most but it's always the same result.

Thank you Mitu, and Herb. I have ordered a wifi dongle.

Jon