But this device doesn't need a way for the user to enter the pincode. So, all the sensitive part of the terminal is probably completely isolated from the android part.
I don't know this device internal and the PED/PTS exact requirement but it seems plausible for me.
You have something like a physical compartment who include the NFC and everything needed to process it like in a classical terminal. This compartment is highly secured as requested by the specification with just a very simple interface for the android part to send the amount to bill.
I've seen a lot of each-machine running on windows. Doesn't they work like this with the windows machine just managing the display buttons to select the amount and sending this information to the secure part who handle card interaction, pincode and delivery of the money ?
Yes this is a common design in fact most current solution segregated the POS and POI completely anything that handles the actual credit card whether it's C&P, Track2 or NFC is a closed black box with the required PED/PTS/POI and P2PE certifications the merchant never sees what's going on they only can talk to the thing in bill the next card X and get a confirmation of the transaction that's it they don't see any of the card data they don't even see any card holder data unless they collect it in a side channel e.g. a loyalty program.
Now none of these certifications or standards is bullet proof but people have a very skewed vision of the PCI certification process likely due to bias of only having interacting with the PCI-DSS requirements for merchants and low levels to boot meaning they didn't had to do anything but to fill the SAQ themselves and be on their way.
I don't know this device internal and the PED/PTS exact requirement but it seems plausible for me.
You have something like a physical compartment who include the NFC and everything needed to process it like in a classical terminal. This compartment is highly secured as requested by the specification with just a very simple interface for the android part to send the amount to bill.
I've seen a lot of each-machine running on windows. Doesn't they work like this with the windows machine just managing the display buttons to select the amount and sending this information to the secure part who handle card interaction, pincode and delivery of the money ?