41 create counting example with barcode scanner

[sistemicorp]

Working script that lets the user scan bar codes.
The "counting" part takes place on Lente, where the PASS count is the "count".
For duplicates, the client would have to make a separate SQL and look for uniqie serial numbers.

Note:

• operator has to wait ~2 sec between scans
• operator has to scan a "STOP" barcode to put Prism back into a non-running state, else the GUI will get stuck.
• there is a pdf file with barcodes used for testing

Untested: Using multiple scanners, although the code supports finding more than one scanner. I didn't have another scanner so this is untested.

[sistemicorp]

@andrewoaks-staric when you can try this with your scanner, you will need to add your scanner to the supported scanners. To do so, use lsusb to see the manufacturer of your scanner, and then add that name to hwdrv_scanners.py.

Here is what my lsusb looks like,

(.venv) martin@martin-ThinkPad-L13-Gen-2a:~/git/scripts$ lsusb
Bus 003 Device 010: ID 05f9:220c PSC Scanning, Inc. Datalogic Gryphon GD4430

And the list in hwdrv_scanners.py looks like,

    # add as required
    SCANNER_MANUFACTURERS = ["Datalogic", ]