The HID protocol does not provide a way for the host to be informed when the value of a feature report changes so there's no way to implement that kind of event. You must poll the device by calling chrome.hid.receiveFeatureReport(). Are you sure the device reports the value you are looking for as a feature report and not an input report?

Yes,I am polling the device by calling chrome.hid.receiveFeatureReport() function. I tried chrome.hid.receive() function also, but no result.
for receiving input report, which function should i use, I found only two functions only for receiving data , chrome.hid.receiveFeatureReport() and chrome.hid.receive(), both i have tried.

Thanks for response!

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

My research online[1] indicates that DYMO scales send the item weight as an input report. These are read by calling chrome.hid.receive().

[1]: https://github.com/erjiang/usbscale

I already tried with chrome.hid.receive() function, its not returning anything. Before i was using that later i changed it to chrome.hid.receiveFeatureReport() at the place of chrome.hid.receive() function.

Thanks!

How to use chrome.hid.receive() function? I am polling this function after 500ms interval. But i am not getting any data. Weight scale is sending data correctly, but i am unable to read data by chrome.hid.receive() function. I tried both function from last 1 week, but still i didnt get any solution. I am hopeless.

Please help me.

Thanks!

sample code

chrome.hid.connect(deviceId, function(connectInfo) {
          if (!connectInfo) {
              console.log("unable to connect :(");
          }

          connection = connectInfo.connectionId;
          console.log("connected successfully");
          readWeight();

      });

var readWeight = function(){
      chrome.hid.receive(connection, function(reportId, result) {
          let data = new Uint8Array(result);
          
          var str1 = "";
          var str2 = ByteArrayToString(data);
          if (!(str2 != ""))
              return;
          if (outPutInfo.Unit == "oz")
          {
              str1 = (+str2 / 10.0) + "";
          }
          else if (outPutInfo.Unit == "gram")
          {
              str1 = str2;
          }

          console.log("Reading of weight :" + str1 + " " + outPutInfo.Unit);
          
          setTimeout(readWeight, 200);
          
      });
  }

Hi,
I don't get any clue over internet still. I am unable to figure this issue out.
I need your support, please give me any clue to figure it out. 

@ Is there any log for api, from there i can figure out issue of receive function? 
@ Is it a bug or development or issue of understanding?
@ Can chrome.hid not communicate with dymo scale?

Many questions are in my mind, but i am not sure even for single query.

Please guys help me, you guys only can clear my issue. Please help me.

I am looking forward for your response!

Thanks for your attention !! 

If there is an error reading from the device that is logged to chrome://device-log. If you can reproduce this issue on a Linux host you can use Wireshark to sniff traffic on the USB bus in order to see what data is being sent.

Make sure you are checking chrome.runtime.lastError in your callbacks as that is how Chrome Apps APIs report errors.

Hi,
I checked in wireshark on ubuntu, I tried to understand that report but i didnt get how to troubleshoot my problem by this. I am getting USBHID protocol report in wireshark while connecting device to ubuntu computer.

I am checking chrome.runtime.lastError, I am getting undefined. 

I have attached device log file and wireshark report with this comment. Please suggest me how to overcome from this problem, may these attachment help you to understand actual problem.

Thanks for your valuable time.

Deleted: hid_wireshaek_snif.pcapng 11.8 KB

hid_wireshaek_snif.pcapng 11.8 KB Download

Deleted: Device Log.txt 1.5 KB

Device Log.txt 1.5 KB View Download

Hi guys,

Still i am on same place, i tried to solve this issue, but still even i don't know what is exact issue. I am expecting support from your side. 
-> i don't see any error in chrome://device-log
-> i checked in chrome://system also, didn't find anything to troubleshoot
-> i checked device on window using a c# program, there device is working.
-> i checked in wireshark also and output sniff attached with last comment.


That all things i tried, but still i didn't get what is issue.

can you please tell me-
-> is there any way to see log of api calling functions?
-> Is there anything like that device not supports your calls(I am using DYMO M10 10 Kg Digital Postal Scale )?
-> should i stop using chrome OS for such tasks, as OS not support?

Please help me.

Thanks!!