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USB HID, serial/COM, BLE HID, classic SPP or a 2.4G cradle: how a barcode scanner reaches your app, the keyboard-emulation traps, and what to test live.
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Reader and scanner are not a spec. The parts inside a barcode reader, what each decides in the field, and how to buy against symbologies, not words.
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How to scan a barcode and fix failed scans: aim angle and stand-off, glare, damaged or low-contrast labels, shrink wrap, quiet zone and screen codes.
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