스케쥴러 시작/정기 기능 추가

app/controllers/modbus_controller.rb

@@ -1,6 +1,17 @@
 class ModbusController < ApplicationController
   def index
     @schedule = Schedule.all
+    @modbus_running = Modbus::PollingService.running?
+  end
+
+  def start
+    Modbus::PollingService.start
+    redirect_to modbus_index_path
+  end
+
+  def stop
+    Modbus::PollingService.stop
+    redirect_to modbus_index_path
   end
 
   def schedule_edit

app/services/modbus/polling_service.rb

@@ -2,9 +2,9 @@ module Modbus
   class PollingService
     class << self
       def start
-        return if @thread&.alive?
+        return if $modbus_polling_threads.any?(&:alive?)
 
-        @thread = Thread.new do
+        thread = Thread.new do
           puts "[#{Time.current}] Modbus polling service 시작됨"
           last_logged_hour = nil
           loop do
@@ -32,14 +32,17 @@ module Modbus
             end
           end
         end
+        $modbus_polling_threads << thread
       end
 
       def stop
-        if @thread
-          @thread.exit
-          @thread = nil
-          puts "[#{Time.now}] Modbus polling service 중지됨"
-        end
+        $modbus_polling_threads.each { |t| t.kill if t.alive? }
+        $modbus_polling_threads.clear
+        puts "[#{Time.now}] Modbus polling service 중지됨"
+      end
+
+      def running?
+        $modbus_polling_threads.any?(&:alive?)
       end
     end
   end

app/views/modbus/index.html.erb

@@ -1,3 +1,5 @@
+<meta http-equiv="refresh" content="5">
+
 <% if flash[:notice] %>
   <div class="mb-4 rounded bg-green-100 px-4 py-2 text-green-800 border border-green-300">
     <%= flash[:notice] %>
@@ -15,4 +17,20 @@
   </div>
 <% end %>
 
-<%= link_to "수정", "/modbus/schedule_edit", class: "btn btn-primary" %>
+<div class="py-4">
+  <%= button_to "수정", schedule_edit_modbus_index_path, method: :get, class: "btn bg-primary" %>
+</div>
+
+<div class="flex gap-x-2">
+  <%= button_to "스케쥴러 시작", start_modbus_index_path, method: :post, class: "btn bg-accept" %>
+  <%= button_to "스케쥴러 정지", stop_modbus_index_path, method: :post, class: "btn bg-danger" %>
+</div>
+
+<div class="py-4">
+  <span class="font-semibold">스케쥴러 상태:</span>
+  <% if @modbus_running %>
+    <span class="text-accept font-bold">실행 중</span>
+  <% else %>
+    <span class="text-danger font-bold">정지됨</span>
+  <% end %>
+</div>

app/views/modbus/schedule_edit.html.erb

@@ -1,4 +1,4 @@
-<%= form_with url: "/modbus/schedule_edit_update", method: :post do %>
+<%= form_with url: schedule_edit_update_modbus_index_path, method: :post do %>
   <% @schedule.each do |s| %>
     <div class="flex justify-items-center gap-x-2 pb-2">
       <div><%= s.hour %>시</div>