server.js

import express from "express";
import { createServer } from "http";
import { Server } from "socket.io";
import cors from "cors";
import dotenv from 'dotenv';
import os from "os";

dotenv.config({ quiet: true });

const app = express();
const server = createServer(app);
const io = new Server(server, { cors: { origin: "*" } });

app.use(cors());
app.use(express.static("public"));

let servoAngles = [0, 0, 0, 0];

io.on("connection", (socket) => {
  console.log("User connected.");

  socket.on("servoData", (data) => {
    servoAngles = data;
    console.log("New angle values:", servoAngles);
  });

  socket.on("disconnect", () => {
    console.log("User left.");
  });
});

app.get("/servo", (req, res) => {
  res.json({ angles: servoAngles });
});

function getIPv4Address() {
  const interfaces = os.networkInterfaces();
  for (const interfaceName in interfaces) {
    for (const interfaceDetails of interfaces[interfaceName]) {
      if (interfaceDetails.family === 'IPv4' && !interfaceDetails.internal) {
        return interfaceDetails.address;
      }
    }
  }
  return null;
}

const PORT = process.env.PORT || 3000;

server.listen(PORT, `${getIPv4Address()}`, () => {
  console.log(`Server is running at http://${getIPv4Address()}:${PORT}`);
});