sms_rc_door_backend.js

var SerialPort = require('serialport');
var createInterface = require('readline').createInterface;
var moment = require('moment');

const PHONE_NUMBER = "+989XXXXXXXXX";

var port = new SerialPort('COM3');

var lineReader = createInterface({
    input: port
});

lineReader.on('line', function (line) {
    console.log(line);
    if (line.startsWith("+CMGR:")) {
        var spl = line.split("\"");
        console.log(spl);
        if(spl[1] !== "REC UNREAD") {
            console.log("message is not unread");
            return;
        }
        if(spl[3] !== PHONE_NUMBER) {
            console.log("phone number is wrong");
            return;
        }
        var diff = moment(spl[5].substr(0, 17), "YY/MM/DD,HH:mm:ss").diff(moment());
        console.log("diff is", diff);
        if (diff <= 0 && diff >= -10000) {
            console.log("Let's open the door");
            setTimeout(() => {
                port.write('OPEN\n');
            }, 1000);
        } else {
            console.log("message is old.. ignore it");
        }
    }
});