simplify send FCM

ecosystem.config.js

@@ -5,6 +5,7 @@ module.exports = {
   exec_mode: 'cluster',
   instances: "1",
   watch: true,
+  time:true,
   env: {
     "PORT": 3004,
     "NODE_ENV": "development",

index.js

@@ -1,7 +1,7 @@
 const express = require("express");
 const path = require("path");
 var admin = require("firebase-admin");
-const port = 3004;
+const port = process.env.PORT || 3004;
 
 var dirPath = path.join(__dirname, "fcm_key");