NFC pairing - what is OOB data

RE: NFC pairing - what is OOB data

Simonr — Thu, 25 Aug 2022 07:51:48 GMT

No, I was referring to the NFC pairing sample documentation. Here you can see that you can set it up as both as a static handover and a negotiated handover.

Best regards,

Simon

RE: NFC pairing - what is OOB data

Matthew K — Wed, 24 Aug 2022 15:34:34 GMT

Thank you Simon.

[quote userid="75734" url="~/f/nordic-q-a/90812/nfc-pairing---what-is-oob-data/382561"]As explained in the sample documentation, the OOB sample does pairing in a 2-way manner[/quote]

Are you referring to NFC's "Bluetooth Secure Simple Pairing" document?

RE: NFC pairing - what is OOB data

Simonr — Mon, 22 Aug 2022 06:24:56 GMT

1. Yes, alongside the information that is sent between Device A and B during pairing (like the message sequence chart explains).

2. As explained in the sample documentation, the OOB sample does pairing in a 2-way manner, so both the phone and nRF device provides OOB data in this pairing procedure.

Best regards,

Simon

RE: NFC pairing - what is OOB data

Matthew K — Fri, 19 Aug 2022 08:30:52 GMT

Hi, Simon. I think I finally understood, hopefully:

[Q] OOB data are
confirmation value and random value
is this correct?

Are these values always 256-bit?

[Q] About "should not be necessary to use the nRF Connect Mobile app to do OOB as this is part of the NFC and BLE spec.",

I read that there are 3 possible scenarios:
1) Both smartphone and the nRF52 peripheral provides OOB data via NFC
2) Only the smartphone provides the OOB data via NFC
3) Only the nRF52 peripheral provides the OOB data via NFC

When using Android native OOB NFC (not using any Android mobile OOB NFC app),
which "scenario" is used?

Are both Android and nRF52 provide

ra, CA, rb, Cb

with the native OOB NFC?

Thanks for your help.

RE: NFC pairing - what is OOB data

Simonr — Thu, 11 Aug 2022 08:22:49 GMT

Seems like Bluetooth Secure Simple Pairing is the go-to for information on the OOB pairing and BLE compatibility.

Best regards,

Simon

RE: NFC pairing - what is OOB data

Matthew K — Wed, 10 Aug 2022 15:17:03 GMT

Thanks Simon. There are several NFC documents shown on the core-specification page.

I don't want to buy every NFC doc. Which one should I refer to?
Data Exchange Format (NDEF) Technical Specification
Connection Handover Technical Specification
Bluetooth Secure Simple Pairing
?

Thank you!

RE: NFC pairing - what is OOB data

Simonr — Wed, 10 Aug 2022 10:43:02 GMT

1. True, it seems the NFC forum has changed and now the specification must be purchased from them it seems. Here is more information on that. I will notify our documentation team that the link must be updated. Thank you for letting us know.

2.This is defined by the NFC and BLE specifications, not by our SDK.

3. It should not be necessary to use the nRF Connect Mobile app to do OOB as this is part of the NFC and BLE spec. and as long as the phone you're using supports BLE and NFC that should be covered in the Android stack.

Best regards,

Simon

RE: NFC pairing - what is OOB data

Matthew K — Tue, 09 Aug 2022 22:26:45 GMT

Thank you Simon. I want to test the LE Secure Connections pairing with OOB data

[Q] When I click that "NFC forum document" link or the "Bluetooth Secure Simple Pairing Using NFC" link, I only see the NFC's main webpage.
Can I request the document URLs?

[Q] About the OOB data / LE OOB record / BLE pairing messages / LESC OOB data,
infocenter.nordicsemi.com/.../nfc_ndef_ble_pair_message_module_dox.html

Are these defined by the NFC forum or defined by Nordic's nRF5 SDK?

[Q] When tagging the peripheral_nfc_pairing example to an Android phone, does the nRF Connect mobile app has to be running?
Or is this a native Android feature where the Android app sends the "OOB data" without any mobile app running?

RE: NFC pairing - what is OOB data

Simonr — Tue, 09 Aug 2022 13:16:16 GMT

The OOB data is described in the Bluetooth LE OOB records here. The OOB data is set in the lesc_oob_data_set() function. Is there a specific function you're looking for, they can all be found in the peripheral NFC pairing C:\...\ncs\v2.0.0\nrf\samples\bluetooth\peripheral_nfc_pairing.

Best regards,

Simon