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Is it possible to include a length parameter for the ReceiveFeatureReport function? #108

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sd016808 opened this issue May 5, 2023 · 2 comments
Open

Is it possible to include a length parameter for the ReceiveFeatureReport function? #108

sd016808 opened this issue May 5, 2023 · 2 comments

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@sd016808
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sd016808 commented May 5, 2023

In our web application, we need to reduce the packet size to increase the update frequency.

When using the Logic Analyzer to observe the packet, I noticed that ReceiveFeatureReport always returns the full length as defined in the descriptor. However, with HIDIOCGFEATURE(len) in Linux or HidD_GetFeature in Windows, only a specific length will be obtained.

How can we do it using WebHID?
@nondebug
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nondebug commented May 5, 2023

Interesting, I didn't realize you could request a shorter report to improve update frequency. Currently, WebHID uses the size of the report defined in the report descriptor and doesn't provide a way to specify the report size.

We could support this by adding an (optional) options parameter to receiveFeatureReport:

device.receiveFeatureReport(reportId, {overrideReportLength: 8});

I'm not sure what this should do if the requested report length is longer than the length defined in the report descriptor. I think for most devices this will cause a device error, but perhaps there are devices where this is necessary.

@sd016808
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sd016808 commented May 8, 2023

Thanks! I am really looking forward for this feature.

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@sd016808 @nondebug