broadcast to user

 var express = require('express');
 const request = require('request');
 const TARGET_URL = 'https://api.line.me/v2/bot/message/reply'
+const MULTI_TARGET_URL = 'https://api.line.me/v2/bot/message/multicast'
 const BROAD_TARGET_URL = 'https://api.line.me/v2/bot/message/broadcast'
 const TOKEN = ''
 const fs = require('fs');
@@ -11,7 +12,14 @@ const sslport = 23023;
 
 const bodyParser = require('body-parser');
 var app = express();
-  
+
+// broadcast route
+var period_broadcast = 50000;
+var count_broadcast = 0;
+setInterval(function(){
+    broadcast();
+}, period_broadcast);
+
 app.use(bodyParser.json());
 app.post('/hook', function (req, res) {
 
@@ -24,13 +32,16 @@ app.post('/hook', function (req, res) {
     console.log('[request]', req.body);
     console.log('[request source] ', eventObj.source);
     console.log('[request message]', eventObj.message);
+    
 
     var isNationWide = message.text;
     var sub_nationwide = "국내";
     if(isNationWide.indexOf(sub_nationwide) !== -1){
         replyNationWide(eventObj);
     }
-    else if(message.text == "야" || message.text == "도움말"){
+
+    var sub_hello = "어떻게"
+    if(message.text == "야" || message.text == "도움말" || message.text.indexOf(sub_hello) !== -1){
         hello(eventObj)
     }
 
@@ -97,7 +108,7 @@ function hello(eventObj) {
                 "messages":[
                     {
                         "type":"text",
-                        "text":"안녕하십니까. 코로나 도우미 입니다."
+                        "text":"안녕하십니까. 코로나 알리미 입니다."
                     },
                     {
                         "type":"text",
@@ -117,7 +128,8 @@ function hello(eventObj) {
 }
 
 // Broadcast
-function broadcast(eventObj){
+function broadcast(){
+
     request.post(
         {
             url: BROAD_TARGET_URL,
@@ -141,6 +153,30 @@ function broadcast(eventObj){
         });
 }
 
+// Multicast User
+// request.post(
+//     {
+//         url: MULTI_TARGET_URL,
+//         headers: {
+//             'Authorization': `Bearer ${TOKEN}`
+//         },
+//         json: {
+//             "to": [`${USER_ID}`],
+//             "messages":[
+//                 {
+//                     "type":"text",
+//                     "text":"Hello, user"
+//                 },
+//                 {
+//                     "type":"text",
+//                     "text":"May I help you?"
+//                 }
+//             ]
+//         }
+//     },(error, response, body) => {
+//         console.log(body)
+//     });
+
 try {
     const option = {
       ca: fs.readFileSync('/etc/letsencrypt/live/' + domain +'/fullchain.pem'),