[IDEA AND START OF DEVELOPMENT]Battery Check For All Controllers

[retroprogrammer]

Hey guys, I am trying to make a script which basically tells you how much battery is left of your wireless controller, Because I don't have all controllers I am going to need some help.
I got this idea off this post: https://retropie.org.uk/forum/topic/12945/wireless-battery-indicator-ps3
if any one does have some screen shots of how sixad log file path: /var/log/sixad
looks like please post :)

But instead of getting the battery level from the sixad log file path: /var/log/sixad
we get it from: /sys/class/power_supply/what_ever_controller_ac:fd:21:d1:7c:24/capacity

Here is an example script:

#!/bin/bash

# Specify log file path
logPath='sys/class/power_supply/what_ever_controller_ac:fd:21:d1:7c:24/capacity'

# Create array of controller position names
ctrlPosition=('First' 'Second' 'Third' 'Fourth')
ctrlIndex=0

# Create array to store battery levels
batLevels=('dead' 'low' '25%' '50%' '75%' '100%')

# Create a container to store message text
dialogTxt=$""


# Extract and loop through the most recent lines of the log file which contain the word 'Battery'
tac $logPath | grep -m 1 -B1000 "Watching" | tac | grep "Battery" | 
{
while read -r line ; do

	# Print out raw info (for debugging)
	#echo "$line"

	# Extract PID values from battery print-outs
	chkPID=$(echo "$line" | grep -oP '(?<=[).*(?=]:)')

	# Check if PID is still running. If so, get the battery value
	if ps -p "$chkPID" > /dev/null ; then
		# Extract battery value (0-5)
		batIndex=$(echo "$line" | grep -oP '(?<=Battery 0).*(?=])')

		# Append battery level text to any existing text
		dialogTxt+=$"${ctrlPosition[ctrlIndex]} controller battery level is at ${batLevels[batIndex]}\n\n"

		# Increment the controller index, in case there are multiple controller PIDs
		((ctrlIndex++))
	fi	
	
done


# Check to see if no controllers were detected (ctrlIndex wasn't incremented above)
if [[ "$ctrlIndex" -eq "0" ]] ; then
	dialogTxt=$"No wireless controllers detected!"
fi

# Create message box containing battery info
dialog --no-mouse --ok-label "OK" --backtitle "Battery Check" --msgbox "$dialogTxt" 12 60 2>&1 > /dev/tty
}

I practically copyed and pasted the https://retropie.org.uk/forum/topic/12945/wireless-battery-indicator-ps3 code that was there and made a few adjustments I didn't do
to much[changed a few word ;)] as I am not the best with this type of stuff but will try my best!

[retroprogrammer]

the example does not work, I just put it their as well a 'example' for us to base of :)

[retroprogrammer]

Any one have any ideas?

[cyperghost]

@retroprogrammer
Your suggestion does not work in general. The powerlevel-feature via /sys/class is a design in the joypad firmware and can change from company to company :(

Maybe the hcidump-method introduced by @psyke83 is a more valueable way. If you want you can make a script collection to read out known controllers.

[retroprogrammer]

@cyperghost yeah, I will try to do that