NRF52 pair to NRF52 using NFC RFID tag with MAC address

RE: NRF52 pair to NRF52 using NFC RFID tag with MAC address

endnode — Thu, 05 Oct 2017 21:31:23 GMT

Yes, you seems to get it right now. Good luck.

RE: NRF52 pair to NRF52 using NFC RFID tag with MAC address

zachtos — Thu, 05 Oct 2017 21:24:37 GMT

Excellent. Than I can accomplish the task by adding a Reader chip NXP MFRC630, PN532 or MFRC522. I think if peripheral taps to central which is connected to reader chip, then reader will send the MAC address of the peripheral to the central, then the central will connect with proper information to the always advertising peripheral. So only need to touch to pair in this scenario, which is even better I guess. Just have to add a bit more cost than I intended to the product.

RE: NRF52 pair to NRF52 using NFC RFID tag with MAC address

Krzysztof Zaraska — Thu, 05 Oct 2017 21:00:32 GMT

You get a callback when tag is read.

infocenter.nordicsemi.com/index.jsp

RE: NRF52 pair to NRF52 using NFC RFID tag with MAC address

endnode — Thu, 05 Oct 2017 19:43:09 GMT

If you are asking how NFC tag emulation inside nRF52 FW knows that there is any communication happening then I believe there should be such hooks in NFC NDEF tag type 2 or 4 "stacks" provided by Nordic. If this is really must (normally you shouldn't care, simply advertise, let everyone connect only the right guy who got transferred some out-of-band information over NFC will be able to continue in secure communication, otherwise you can kick every connecting device out after while) then you can base your NFC protocol on some read operation and that will definitely trigger your app FW.

RE: NRF52 pair to NRF52 using NFC RFID tag with MAC address

endnode — Thu, 05 Oct 2017 19:39:36 GMT

Sorry, I don't get the point of your architecture as I stopped at the point where you are trying to explain what should devices do but based on wrong assumptions (= that nRF52 can read other NFC tag without additional HW) and by mixing the technical terms. Could you rewrite your original question so it will be crystal clear what is your final HW set-up (or at least what are your priorities on that side) and what you want to achieve (what is minimal set of conditions the solution should meet). Then we can help you easily.

RE: NRF52 pair to NRF52 using NFC RFID tag with MAC address

zachtos — Thu, 05 Oct 2017 19:34:39 GMT

So then how does the peripheral 'know' that it's MAC address was read by the PN532?
--otherwise if it can emulate RFID only, I don't see how it would know to ever begin advertising to connect to the central...

RE: NRF52 pair to NRF52 using NFC RFID tag with MAC address

endnode — Thu, 05 Oct 2017 16:51:11 GMT

Sure, once you have at least one NFC reader you can do whatever (by read and write).

RE: NRF52 pair to NRF52 using NFC RFID tag with MAC address

Krzysztof Zaraska — Thu, 05 Oct 2017 16:45:01 GMT

How about:

put PN532 in the central
place peripherial close to the central
press button on central
central's PN532 reads peripherial's MAC address etc.
central's PN532 writes its MAC address etc. to the peripherial
peripherial starts advertising or whatever

RE: NRF52 pair to NRF52 using NFC RFID tag with MAC address

endnode — Thu, 05 Oct 2017 15:11:50 GMT

You misunderstood nRF52 capabilities I'm afraid: it can only emulate NFC TAG (ISO14443-A PICC role), for reading you need to have some "NFC reader" HW like PN532 you mentioned.