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device.transferOut(1, data);

aybarburak

function printText(text) {
    return new Uint8Array(text.split('').map(char => char.charCodeAt(0)))
}

aybarburak

const ESC_INIT = [0x1b, 0x40];
const ESC_BIT_IMAGE = [0x1b, 0x2a]
const DOTS_DENSITY = 24
const LUMINANCE = {
    RED: 0.299,
    GREEN: 0.587,
    BLUE: 0.114
}
const LINE_FEED = 0x0a;

aybarburak

navigator.usb.addEventListener('connect', event => {
  // event.device will bring the connected device
});

navigator.usb.addEventListener('disconnect', event => {
  // event.device will bring the disconnected device
}); 

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let receivedData = await data.transferIn(1, 6);// Waiting for 6 bytes of data from endpoint #1.

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await device.controlTransferOut({
        requestType: 'vendor',
        recipient: 'interface',
        request: 0x01,  // vendor-specific request: enable channels
        value: 0x0013,  // 0b00010011 (channels 1, 2 and 5)
        index: 0x0001   // Interface 1 is the recipient
});

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await device.transferOut(1, data);

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device.open()
      .then(() => device.selectConfiguration(1))
      .then(() => device.claimInterface(0));

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let button = document.getElementById('request-device');
button.addEventListener('click', async () => {
  let device;
  let usbDeviceProperties = { name: "Bixolon", vendorId: 5380, productId: 31 };
  try {
    device = await navigator.usb.requestDevice({ filters: usbDeviceProperties });
  } catch (error) {
    alert('Error: ' + error.message);
  }
});

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let devices = await navigator.usb.getDevices(); 
devices.forEach(device => { 
  // You can list or choose your device in this block  
});