Used an old kindle to display the info.

I’ve got a Raspberry Pi that creates the magic mirror info and saves it as an image file, the kindle just downloads and displays the image every 5 minutes. Seems to work well so far.

@djgigabit Here is my (sanatized) version of the index.js file from the web-to-kindle:

const express = require('express');
const path = require('path');
const puppeteer = require('puppeteer');
const execFile = require('child_process').execFile;
const fs = require('fs');

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

express()
  .use(express.static(path.join(__dirname, 'public')))
  .set('views', path.join(__dirname, 'views'))
  .set('view engine', 'ejs')
  .get('/', async (req, res) => {
    const browser = await puppeteer.launch({ 
        executablePath: '/bin/chromium-browser'
        });
    const page = await browser.newPage();
    await page.setViewport({ width: 600, height: 800 });
    await page.goto(process.env.SCREENSHOT_URL || '<web address of magicmirror>');

    await new Promise(r => setTimeout(r, 3000));

    await page.screenshot({
      path: '/home/<user>/screenshot.png',
    });

    await browser.close();

    await convert('/home/<user>/screenshot.png');
    screenshot = fs.readFileSync('/home/<user>/screenshot.png');

    res.writeHead(200, {
      'Content-Type': 'image/png',
      'Content-Length': screenshot.length,
    });
    return res.end(screenshot);
  })
  .listen(PORT, () => console.log(`Listening on ${PORT}`));


function convert(filename) {
  return new Promise((resolve, reject) => {
    const args = [filename, '-gravity', 'center', '-negate', '-extent', '600x800', '-colorspace', 'gray', '-depth', '6', '-alpha', 'remove', '-level', '50x100%', filename];
    execFile('convert', args, (error, stdout, stderr) => {
      if (error) {
        console.error({ error, stdout, stderr });
        reject();
      } else {
        resolve();
      }
    });
  });
}

This is where I added the pause before it captures the screenshot. I also had to change the puppeteer.launch command as it was not a happy bunny running on a headerless server.