MagicMirror script to turn on the screen when your phone is connected to the WiFi

script.js

const shell = require('shelljs');
const offlineTime = 300; // 5 minutes

const exec = cmd => shell.exec(cmd, { silent: true });
let state = true;
let lastOnlineAt = Date.now();
const ips = ['INSERT IP 1 HERE', 'INSERT MORE IF YOU NEED'];

exec('vcgencmd display_power 1');  // turn on the monitor to make sure the state is correct

const checkStatus = () => {
  // turn off from 12AM to 8AM
  const date = new Date();
  const hour = date.getHours();
  if (hour < 8) {
    return false;
  }
  
  // check all of the ips
  for (let ip of ips) {
    const isUp = exec(`nmap -sP ${ip}`).includes('Host is up');
    if (isUp) {
      lastOnlineAt = Date.now();
    }
  }
  
  // if they haven't been online for `offlineTime`, turn off the monitor
  if ((Date.now() - lastOnlineAt) > offlineTime * 1000) {
    return false;
  }
  
  // otherwise keep it on
  return true;
};

const loop = () => {
  try {
    const enable = checkStatus();

    if (enable && !state) {
      exec('vcgencmd display_power 1');
      state = true;
    }

    if (!enable && state) {
      exec('vcgencmd display_power 0');
      state = false;
    }
  } catch (err) {
    console.log(err);
  }

  setTimeout(loop, 30000);
};

loop();