You need to perform an over the air packet capture. For this you need a wireless network card on the same channel as the barcode scanner, which is able to operate in monitor mode.
Easiest way to do this is to use Airtool on a MAC as windows its really painful to get OTA captures working
https://www.adriangranados.com/apps/airtool
There might be the ability to do captures using the barcode scanner itself dependent on the model
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