Concurrent transferIn() calls on the same endpoint fail with "endpoint not found"

[Azq2]

import { usb } from 'usb';

const device = await usb.findDeviceByIds(0x11f5, 0x1004);
await device.open();

if (!device.configuration) {
	await device.selectConfiguration(1);
}

try {
	await device.claimInterface(0);
} catch {
	await device.detachKernelDriver(0);
	await device.claimInterface(0);
}

const transfers = [
	device.transferIn(1, 65536),
	device.transferIn(1, 65536),
];

console.log(await Promise.allSettled(transfers));
await device.close();

[kevinmehall]

node-usb-rs/src/webusb_device.rs

Lines 902 to 903 in 34498ac

	.endpoint::<Bulk, DIR>(addr)
	.ok()

The .endpoint() method will fail with Busy, but it doesn't distinguish that from NotFound.

To support concurrent transfers, it needs to create the Endpoint once and re-use it. Something like what I suggested here: node-usb/node-usb#931 (comment)

[Azq2]

Without this, it is impossible to write high-speed serial port drivers like the PL2303. This is a significant regression compared to USB 2.x.