sms.js

const SerialPort = require('serialport')
const Readline = require('@serialport/parser-readline')
const request = require('request');
var iconv = require('iconv-lite');
const express = require('express');
const bodyParser = require('body-parser');
var ic = new require('iconv').Iconv('UTF-8', 'UCS-2');

const app = express()
const express_port = 34343

app.use(bodyParser.urlencoded({ extended: true }));

const port = new SerialPort('/dev/ttyUSB0', {
    baudRate: 2400
})

const parser = port.pipe(new Readline({ delimiter: '\r\n', encoding: 'ascii' }))

port.on('open', () => {
    console.log("port is open")

    setTimeout(() => {
        port.write("AT\r\n")
        port.write("AT+CMGF=1\r\n")
        port.write("AT+CSMP=17,167,0,0\r\n")
        port.write("AT+CNMI=1,2,0,0,0\r\n")
        port.write("AT+CMGDA=DEL ALL\r\n")
    }, 1000);
});

var reading = false
var phoneNumber = ""
var time = ""

parser.on('data', data => {
    console.log(data)

    let buf = Buffer.from(data, 'ascii')

    let str = iconv.decode(buf, 'utf8')

    if(str.startsWith("+CMT")) {
        let start = str.indexOf("\"") + 1
        var sub = str.substring(start)
        phoneNumber = sub.substring(0, sub.indexOf("\""))
        sub = sub.substring(0, sub.length - 1)
        time = sub.substring(sub.lastIndexOf("\"") + 1)

        console.log("phoneNumber = " + phoneNumber + ", time = " + time)

        reading = true
    } else if(reading){
        let text = iconv.decode(buf, 'base64')
    
        request.post('**************************', {
            strictSSL: false,
            form: {
              number: phoneNumber,
              time: time,
              text: text
            }
          })
        reading = false
    }
})

app.post('/', (req, res) => {
    console.log(req.body)
    port.write("AT+CSCS=\"GSM\"\r\n")
    setTimeout(() => {
        port.write("AT+CMGF=1\r\n")
        setTimeout(() => {
            port.write("AT+CMGS=\"" + req.body.number + "\"\r\n")
            setTimeout(() => {
                port.write(req.body.text)
                port.write([0x1a])
                res.send('OK')
            }, 500)
        }, 500)
    }, 500)
});

app.listen(express_port, '127.0.0.1', () => {
    console.log(`Example app listening at http://localhost:${express_port}`)
})