Feature Request: Integrate with USB scale

[agritheory]

I have a USB scale and would like to integrate it such that:

• When a device is detected it shows a [ value | UOM ] readout on the page of configured doctypes
  • If no device is detected, no readout is shown
• I want to capture that output and set the last row with that data (eg, frm.doc.items[-1].qty and uom)
  • The capture can be triggered by a keypress (what key? any key?)
  • If enough consecutive reads of the weight and UOM are of the same number, automatically set the qty and UOM, if it is also NOT the the value of frm.doc.items[-2].qty and uom

In the proof of concept script I ran into a few issues.

• This feature is only supported on Chrome, Edge and Opera (which is fine I guess, but get with the times Firefox)
• The ondevicereport callback does not seem to be cancel-able in a reasonable way and would benefit from discussion
• This is currently implemented with jQuery but should probably be a Vue component so that it might be able to be re-used in the planned mobile integration (Portal/ Mobile interface #15)