first commit

.env

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+PORT = 3000

.gitignore

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+node_modules/

controller/serialPort.js

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+import { Router } from 'express';
+import serialPort from '../services/serialPortService.js';
+
+const router = new Router()
+
+router.get('/:id', serialPort);
+
+export default router

index.js

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+import express from 'express';
+import { configDotenv } from "dotenv";
+import router from './controller/serialPort.js';
+
+const app = new express();
+configDotenv();
+
+// app.use(express.urlencoded({ extended: false }))
+app.use(router)
+
+async function run() {
+  app.listen(process.env.PORT);
+  console.log(`This app listens to http://localhost:${process.env.PORT}`)
+}
+await run()

package.json

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+{
+  "name": "roshano_boxmodule",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "pm2 start index.js --watch"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "dotenv": "^16.4.5",
+    "express": "^4.20.0",
+    "pm2": "^5.4.2",
+    "serialport": "^12.0.0"
+  }
+}

services/serialPortService.js

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+import { SerialPort } from 'serialport'
+
+const serialport = new SerialPort({ path: 'COM3', baudRate: 9600, autoOpen: false, }, function (err) {
+  if (err) {
+    return console.log('Error: ', err.message);
+  }
+})
+
+async function serialPort(req, res) {
+  const buff = Buffer.allocUnsafe(4);
+  buff.writeUInt8(`#0${req.params.id}$`);
+
+  const result = await serialport.write(buff)
+
+  res.send(result)
+
+  // serialport.open(function (err) {
+  //   if (err) {
+  //     return console.log('Error opening port: ', err.message);
+  //   }
+
+  //   // Because there's no callback to write, write errors will be emitted on the port:
+  //   serialport.write('main screen turn on');
+  // })
+
+  // serialport.on('error', function (err) {
+  //   console.log('Error: ', err.message);
+  // })
+
+  // serialport.on('readable', function () {
+  //   console.log('Data:', serialport.read());
+  // })
+
+  // serialport.on('data', function (data) {
+  //   console.log('Data:', data);
+  // })
+}
+
+export default serialPort