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USBDevice: controlTransferIn() method

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is available in Web Workers.

The controlTransferIn() method of the USBDevice interface returns a Promise that resolves with a USBInTransferResult when a command or status request has been transmitted to (received by) the USB device.

Syntax

controlTransferIn(setup, length)

Parameters

setup

An object that sets options for. The available options are:

requestType: Must be one of three values specifying whether the transfer is "standard" (common to all USB devices) "class" (common to an industry-standard class of devices) or "vendor".
recipient: Specifies the target of the transfer on the device, one of "device", "interface", "endpoint", or "other".
request: A vendor-specific command.
value: Vendor-specific request parameters.
index: The interface number of the recipient.

length

The maximum number of bytes to read from the device. The actual data is in the USBInTransferResult in the resolved Promise.

Return value

promise that resolves with a USBInTransferResult.

Specifications

Specification
WebUSB API> # dom-usbdevice-controltransferin>

Browser compatibility

	Desktop					Mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	WebView Android	WebView on iOS
`controlTransferIn`	61	79	No	48	No	61	No	45	No	8.0	No	No

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https://developer.mozilla.org/en-US/docs/Web/API/USBDevice/controlTransferIn