webusb-label-printer.js

//  Label Printer 
//  vendorId            0x416
//  productId           0x5011
//  manufacturerName    STMicroelectronics
//  productName         POS Label Printer

async function testPrint(device) {
    const cmds = [
        'SIZE 99.84 mm,149.93 mm',
        'CLS',
        'TEXT 30,10,"4",0,1,1,"Hola mundo"',
        'TEXT 30,50,"2",0,1,1,"WebUSB API"',
        'BARCODE 30,80,"128",70,1,0,2,2,"json.cl"',
        'PRINT 1',
        'END',
    ];

    await device.open();
    await device.selectConfiguration(1);
    await device.claimInterface(0);
    await device.transferOut(
        device.configuration.interfaces[0].alternate.endpoints.find(obj => obj.direction === 'out').endpointNumber,
        new Uint8Array(
        new TextEncoder().encode(cmds.join('\r\n'))
        ),
    );
    await device.close();
}
navigator.usb.requestDevice({ filters: [{ vendorId: 0x416 }] }).then((device)=> {
    console.log(`Name: ${device.productName}, Serial: ${device.serialNumber}`);
    testPrint(device)
    console.log("printed")
})