Ping output to macOS CapsLock LED

pingled.ps1

#!/usr/bin/env pwsh
[CmdletBinding()]
param(
	$IpAddress,
	$Count = 4
)

@'
var capsState;

function run(argv) {
    capsState = argv[0] == '1'?1:0;
    ObjC.import("IOKit");
    ObjC.import("CoreServices");
    (() => {
        var ioConnect = Ref();
        var state = Ref();
        $.IOServiceOpen(
            $.IOServiceGetMatchingService(
                $.kIOMasterPortDefault,
                $.IOServiceMatching(
                    $.kIOHIDSystemClass
                )
            ),
            $.mach_task_self_,
            $.kIOHIDParamConnectType,
            ioConnect
        );
        // GetModifierLockState seems to be broke
        // $.IOHIDGetModifierLockState(ioConnect, $.kIOHIDCapsLockState, state);
        // this.console.log(state);
        $.IOHIDSetModifierLockState(ioConnect, $.kIOHIDCapsLockState, capsState);
        $.IOServiceClose(ioConnect);
    })();
}
'@ | Out-File -Path /tmp/caps.jxa

ping $IpAddress -c $Count | Where-Object { $PSItem -match 'from' } | ForEach-Object {
    ($PSItem -split '[=\ ]')[-2] | Tee-Object -Variable on
    $off = 1000 - $on
    osascript -l JavaScript /tmp/caps.jxa 1
    Start-Sleep -Milliseconds $on
    osascript -l JavaScript /tmp/caps.jxa 0
    Start-Sleep -Milliseconds $off
}

pingled.sh

#!/usr/bin/env bash

PING_TARGET="${1:-google.com}"

cat << EOF > /tmp/toggle.jxa
var capsState;

function run(argv) {
    capsState = argv[0] == '1'?1:0;
    ObjC.import("IOKit");
    ObjC.import("CoreServices");
    (() => {
        var ioConnect = Ref();
        var state = Ref();
        $.IOServiceOpen(
            $.IOServiceGetMatchingService(
                $.kIOMasterPortDefault,
                $.IOServiceMatching(
                    $.kIOHIDSystemClass
                )
            ),
            $.mach_task_self_,
            $.kIOHIDParamConnectType,
            ioConnect
        );
        // GetModifierLockState seems to be broke
        // $.IOHIDGetModifierLockState(ioConnect, $.kIOHIDCapsLockState, state);
        // this.console.log(state);
        $.IOHIDSetModifierLockState(ioConnect, $.kIOHIDCapsLockState, capsState);
        $.IOServiceClose(ioConnect);
    })();
}
EOF

ping $PING_TARGET -c 4 -W 1000 | grep from --line-buffered | while read line; do
    echo $line
    on=$(echo $line | awk -F'[ =.]' '{ print $13 }')
    off=$((1000-$on))
    on_ms=$(printf "0.%03d\n" $on)
    off_ms=$(printf "0.%03d\n" $off)

    osascript -l JavaScript /tmp/toggle.jxa 1
    sleep $on_ms
    osascript -l JavaScript /tmp/toggle.jxa 0
    sleep $off_ms
done

the value of state that's set by IOHIDGetModifierLockState is always false for me. Any clue what's wrong?