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USBDevice: controlTransferIn() method - Web APIs | MDN
controlTransferIn(setup, length)
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
