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Quick howto guide for getting a Shanwan P3/PS3 clone controller working with Retropie(EmulationStation) on a Raspberry Pi 3 Model B+. If you have one of these controllers you may experience various issues, such as the joypad start rumbling when it's connected to the RetroPie, or it refuses to reconnect after a reboot. This guide should fix those issues.
However you more experience other problems, such as you may not be able to use more than one of these P3 controllers at the same time on RetroPie. The specific issues with shaking/rumbling and connecting may also be fixed in newer versions of RetroPie, I have not confirmed this, but it has been mentioned to me.
Commands for quick copy pasting are:
sudo /home/pi/RetroPie-Setup/retropie_setup.sh
sudo sixad --boot-yes
sudo reboot
You can get latest version of RetroPie here: https://retropie.org.uk/
More information may be available here: http://znake.tech/video.aspx?id=2