Thank you for this BKM.
Here you say tests showed Android success for wan network printing - but since wan and not lan, the printer could not trip the cash drawer opening?
POS Card terminals and other HW - #4 by bkm
OTOH Windows does support both local printing that can open a cash drawer
Hardware integrations - #6 by bkm
Since Windows Surface tablets etc are $$ so you intended to test Chrome OS tablets as a cheaper option. Have you possibly results or a conclusion here?
It seems no interface software has been published or is public to connect a card reader to send credit card payment transaction details directly to ERPNext. For eg a card reader that uses NFC
But Raspberry Pi does work with PN532 or RC522 RFID Reader/Writer devices
https://www.youtube.com/watch?v=nn-nuhAByRk
Maybe ESO can implement that too? Hardware Employee Time Tracking with RFID Chips - #6 by dominik