Enter the Epson Easy Print Module (EPM). It’s the duct tape that holds the modern hospitality web together. Modern web apps can do almost anything—except talk directly to hardware. For security reasons, a browser tab running https://yourpos.com cannot open a raw TCP socket to 192.168.1.100:9100 (the standard Epson thermal printer port).
// Step 2: Send to local module const response = await fetch('http://localhost:8008/print', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ device: 'TM-T20X', data: base64Data }) }); Epson Easy Print Module
That's it. No WebUSB permission popups. No serial-port API browser compatibility hell. Just a POST request. It requires a local install. The user (or your MDM) must install the Epson Easy Print Module application once per machine. That's fine for fixed kiosks or POS terminals, but impossible for a "visit this website and print from your phone" use case. Enter the Epson Easy Print Module (EPM)