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// From https://github.com/WebBluetoothCG/demos/blob/gh-pages/bluetooth-printer/index.html
var SERVICE = '000018f0-0000-1000-8000-00805f9b34fb';
var WRITE = '00002af1-0000-1000-8000-00805f9b34fb';
var DATA = ''
+ '\x1B' + '\x61' + '\x31' // center align
+ '\x1D' + '\x21' + '\x11' + 'Hello\nBluetooth!\n\n' // double font size
+ '\x1D' + '\x21' + '\x00' + '... from your friends\nat https://qz.io' // normal font size
+ '\n\n\n\n\n\n\n'; // feed paper