luci-app-ledtrig-ping: add ping-based LED trigger

Add LED trigger driven by ping (on = reachable, off = unreachable).
- LED trigger plugin (ping target + check interval) on System -> LEDs
- Procd service and script; ucitrack reload on system config change
- PKG_VERSION 1.0.0, PKG_RELEASE 1
Closes: #8309

Signed-off-by: smartcoder0777 <smartcoder0215@gmail.com>

Author: smartcoder0777

applications/luci-app-ledtrig-ping/Makefile

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+#
+# Copyright (C) 2025 OpenWrt LuCI community
+#
+# This is free software, licensed under the Apache License Version 2.0.
+#
+
+include $(TOPDIR)/rules.mk
+
+LUCI_TITLE:=LuCI LED trigger: ping target
+LUCI_DESCRIPTION:=LED trigger that indicates reachability of a host (on = reachable, off = unreachable).
+LUCI_DEPENDS:=+luci-base
+
+PKG_VERSION:=1.0.0
+PKG_RELEASE:=1
+PKG_LICENSE:=Apache-2.0
+PKG_MAINTAINER:=LuCI community <luci@lists.openwrt.org>
+
+include ../../luci.mk
+
+# call BuildPackage - OpenWrt buildroot signature

applications/luci-app-ledtrig-ping/htdocs/luci-static/resources/view/system/led-trigger/ping.js

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+'use strict';
+'require baseclass';
+'require form';
+
+return baseclass.extend({
+	trigger: _('Ping target (userspace)'),
+	description: _('The LED indicates reachability of a host by blinking on success and off on failure.'),
+	kernel: false,
+	addFormOptions: function(s) {
+		var o;
+
+		o = s.option(form.Value, 'target', _('Ping target'),
+			_('Host or IP address to ping for LED state.')
+		);
+		o.placeholder = '8.8.8.8';
+		o.rmempty = false;
+		o.modalonly = true;
+		o.depends('trigger', 'ping');
+
+		o = s.option(form.Value, 'interval', _('Check interval (seconds)'),
+			_('How often (in seconds) to check reachability.')
+		);
+		o.placeholder = '5';
+		o.datatype = 'uinteger';
+		o.rmempty = true;
+		o.modalonly = true;
+		o.depends('trigger', 'ping');
+	}
+});

applications/luci-app-ledtrig-ping/root/etc/init.d/ledtrig-ping

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+#!/bin/sh /etc/rc.common
+
+START=21
+STOP=10
+USE_PROCD=1
+
+start_service() {
+	procd_open_instance
+	procd_set_param command /usr/libexec/ledtrig-ping
+	procd_set_param respawn ${respawn_threshold:-3600} ${respawn_timeout:-5} ${respawn_retry:-5}
+	procd_close_instance
+}
+
+service_triggers() {
+	procd_add_reload_trigger "system"
+}

applications/luci-app-ledtrig-ping/root/usr/libexec/ledtrig-ping

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+#!/bin/sh
+# LED trigger: ping target. Reads UCI system.@led[], for each with trigger=ping
+# sets LED to "none" and drives brightness by pinging the configured target.
+
+LEDS_PATH="/sys/class/leds"
+CHECK_INTERVAL=5
+
+while true; do
+	for sec in $(uci show system 2>/dev/null | sed -n 's/^system\.\([^.=]*\)\.trigger=.*/\1/p'); do
+		[ "$(uci -q get system.$sec.trigger 2>/dev/null)" != "ping" ] && continue
+		sysfs=$(uci -q get system.$sec.sysfs 2>/dev/null)
+		target=$(uci -q get system.$sec.target 2>/dev/null)
+		[ -z "$sysfs" ] || [ -z "$target" ] && continue
+		[ -d "$LEDS_PATH/$sysfs" ] || continue
+
+		echo none > "$LEDS_PATH/$sysfs/trigger" 2>/dev/null
+
+		interval=$(uci -q get system.$sec.interval 2>/dev/null)
+		interval=${interval:-$CHECK_INTERVAL}
+		[ "$interval" -ge 1 ] 2>/dev/null || interval=$CHECK_INTERVAL
+
+		if ping -c 1 -W 3 -q "$target" >/dev/null 2>&1; then
+			echo 255 > "$LEDS_PATH/$sysfs/brightness" 2>/dev/null
+		else
+			echo 0 > "$LEDS_PATH/$sysfs/brightness" 2>/dev/null
+		fi
+	done
+	sleep $CHECK_INTERVAL
+done

applications/luci-app-ledtrig-ping/root/usr/share/ucitrack/ledtrig-ping.json

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+{"config":"system","init":"ledtrig-ping"}