Hi, Im using odoo 14 and don't have PosBox and IoTBox so I use app (PV-COM) to conect with google chrome, this works for many models. I've tried with more that 25 models of Electronic Scale RS232 and USB. No need Odoo programation and its external to odoo.  May be could be a easy solution for windows users check how its works with ShortCut (F8)

https://youtu.be/dMpoT0H4Mfw

I'm lookiing for the same feature,

All help in regards highly appreciated.