chrome.usb.findDevices not working shows error message Failed to open device: Entity not found in chrome://device-log/

[Santinath Mishra]

Hi Folks,

I am developing a chrome app to communicate to HID device using chrome.usb APIs. I am using below chrome APIs

1. chrome.usb.findDevices

2. chrome.usb.controlTransfer

So far I am not able to make it work. chrome://device-log/ shows below error message. 

USBEvent[13:54:01] Failed to open device: Entity not found

I am using right VendorId and ProductId in decimal format, Which I have extracted from device manager info.

Does anyone know about this issue? Any kind of help will be highly appreciated.

Below is the code snippet I am using.

    chrome.usb.findDevices(DEVICE_INFO, function (devices) {

        if (!devices || !devices.length) {

            console.log('device not found');

        }

        console.log("Devices: " + devices);

        console.log(devices[0]);

 var TransferData = {

    "requestType": "class",

    "recipient": "interface",

    "direction": "out",

    "request": 0xx9,

    "value": 0xxx0,

    "index": 0,

   "data": new Uint8Array([00,05, 47, 76, 66, 48, 47,00]).buffer

  };

        setTimeout(function () {

            chrome.usb.controlTransfer(devices[0], TransferData, function (config) {

                if (chrome.runtime.lastError) {

                    console.log(chrome.runtime.lastError);

                } else {

                    console.log('Data Transfer completed');

                }

            });

        }, 3000);

    });