Add joystick permission setting instructions for ROS2

[Achllle]

input group option

add $USER to input

modify dev permissions directly

1. ls -l /dev/input/*
2. chmod a+rw /dev/input/event0 or whatever corresponds to the event joystick
3. make a udev rule like KERNEL=="event[0-9]*", ATTRS{idVendor}=="045e", MODE:="0666", SYMLINK+="xbox"

[apollokit]

Or maybe a better option: just add the user to the input group: sudo adduser ubuntu input (and then log out/in again)

The reason why is we need access to /dev/input/event*, in addition to the js* devices. The event* are in the input group by default.

(all credit to @Achllle for debugging this with me)

[idgaron]

Is there a reason this was never added to the documentation? Seems like a reasonable change to add the user to the input group, and it's what I did for my rover

[Achllle]

Combination of not knowing/remembering that this is an issue for other folks and all of us being volunteers with some elements of being lazy engineers? :) PR most welcome.

[idgaron]

lol no worries - I have done the same thing countless times. just trying to clean up the documentation after having built one fresh myself to give other people an easier time