WebUSB | Implementation of Web API using the JSM | Runtime Evironment library

Today I ran into a problem while trying to connect my NANO Ledger S to my angular app.

I've tried installing this package yet it does not seem to work due to the package throwing some errors.

Module '"events"' can only be default-imported using the 'allowSyntheticDefaultImports' flag

This can be fixed by putting changing the EventEmmiter import to

import {EventEmitter} from "events";

Now at least the app compiles, but when I to access the Devices over the TransportWebUSB class a "ERROR Error: Uncaught (in promise): ReferenceError: Buffer is not defined ReferenceError: Buffer is not defined" error is thrown in the console.

I've tried different stuff like following this tutorial and adding

I am working on an Chrome webapp that uses WebUSB running on an Android device, and am trying to understand how the connection management works.

If I am reading the spec right, if you don't already have permission to interact with the USB device, you call requestDevice to get permission from the user to trigger the initial connection workflow. You can also call getDevices() first to see if permission has already been granted, and if so can proceed from there without going through the initial connection workflow.

Assuming that's an accurate summary (please correct me if not!), then how does that connection information get stored and managed? If I go to chrome://usb-devices, I don't see the devices if they are not currently plugged in. If I go to Local Storage, I din't see anything that looks like a list of devices. Where does the permission-has-already-been-granted information live? Is it possible to forget connection information, manually or programmatically?

Thanks in advance!

I am struggling to get Windows to load the default WinUSB driver for my device. Please note that I am looking for a solution that is using BOS descriptor (and not the old 0xEE string index).

The device enumerates and Windows tells me that it is installing the device, but the WinUSB driver is not loaded. I have tried everything that I can think of, but still I can't get Windows to load the driver. I even uninstall the device and delete the USB flags in the registry whenever I re-try, but to no avail. Is there anyone who can help me to get this to work?

I don't want WebUSB capabilities or anything additional. This is a non-composite device.

This is my BOS descriptor (as sent over USB):

I am trying to access a USB mass storage device using the WebUSB interface. I have read that USB mass storage devices cannot be accessed:

• "For example, if the device is a USB mass storage device that interface is not claimable and if there are no other interfaces the device will be hidden." (Link)
• "The following set of USB interface classes, which should not be claimed using the WebUSB API, will be explicitly blocked by Blink: Audio, Video, HID, Mass Storage[...]" (Link)
• "It cannot. USB mass storage devices are claimed by the system's generic USB mass storage class driver and are therefore unavailable to the browser." (Link)

We are currently using usb sticks for a standalone version of the app where the serial number of the usb stick is important to identify the license. For our new software I also need to access the serial number of the usb mass storage device, but best would be if I could do so in the browser.

Google Chrome does recognise the device as can be seen here.

But when asking for access to a device via WebUSB it is not shown in the list:

My code is pretty straight forward:

I know WebHID/WebUSB are generally available in Google Chrome (https://caniuse.com/webhid and https://caniuse.com/?search=webusb) but are these APIs available also on the iOS version of Google Chrome? I was getting reports from users not being able to connect their devices on iOS (iPad) but unfortunately, I don't have a device to test it on and I didn't find any mentions of it online. Can anybody confirm whether these APIs are available in the iOS version of Chrome?

How do I join DataViews in JavaScript?

Using WebUSB API to get data from a device:

I am trying to connect to Android phone using WebUSB with USB debugging OFF. But It return an error DOMException Acces denied. Basically, I want my PC to connect as USB client (like Keyboard or any usb device) to Android phone.

However, Other USB devices (like USB audio device) are not giving any error. I recieve access error on device.open()

In WebUSB to connect to a device we must select a configuration and interface.
There's also the option to using an alternate interface.

How can I know which ones to use?
Do I need to know this beforehand or can I try to detect for each device?

In WebUSB API is there a way to get a list of all available devices?

The situation I have here is that a computer can have more than one identical device, lets say it has 2 identical printers. I want to avoid displaying the popup asking the user to select a device so I would like to check if the device is already claimed.

I can check if a device is already claimed by running navigator.usb.getDevices(); but this only lists devices that are already claimed, if there's an identical device that is not yet claimed I can't know.

So the issue is that if I consider that the device is already claimed and don't show the dialog the user can't use the second device and if I never consider a device claimed I will have to show the dialog every time.