server.js

import { Tun, Tap} from 'tuntap2';
import net from 'net';

import {config} from 'dotenv';
import fs from 'fs';
config();
const tap = new Tap();

let passphrase= process.env.passphrase;

/* let pubkeyobj = readArmored(fs.readFileSync('pub.asc', 'utf8'));
let privkeyobj = readArmored(fs.readFileSync('priv.asc', 'utf8')); */

try{

    tap.mtu = 1400;
    tap.ipv4 = "10.11.12.1/24";
/*     tap.on('data', (buf) => {
        console.log(`received: ${buf}`);
    }); */
    tap.isUp = true;
    console.log(`created tap: ${tap.name}, ip: ${tap.ipv4}, mtu: ${tap.mtu}`);
    //console.log(tap);
    //tap.release();
}catch(e){
    console.log(`error: ${e}`);
    process.exit(0);
}
var srv = net.createServer({}, function(c) {
    console.log('server connected');

    if(tap) {
        c.on('data', (buf) => {
            console.log(`received: ${buf}`);
            tap.write(buf);
        });
        tap.on('data', (buf) => {
            console.log(`sent: ${buf}`);
            c.write(buf);
        });
    }

});
srv.listen(process.env.serverPort, function() {});