[nRF Connect SDK]How to use custom NFC tag to connect?

[Tim Hwang]

Target nRF52832(nrf52dk_nrf52832)
SDK NCS v1.9.1

We are preparing NFC with classic tag.(Not connected to nrf52832, separated custom tag)
Recently I found that android cannot connect to BLE until BLE scan is done once.
(Of course NFC tagging and connection works well after BLE scan)

Q1. In case we use classic tag, can I connect to BLE without BLE scan? (in my test, I know that it is not easy)

Q2. If we change classic tag to BLE tag, can we connect BLE without scan?

Q3. I'm testing custom BLE tag for test, and I found I cannot make bonding. (sample peripheral_hids_keyboard)
Do you have any idea? I'm not sure if it is from SW or wrong programmed tag.
 
Security failed: F8:F1:E6:2F:79:5C (public) level 1 err 1
E: reason 0x4
Security failed: F8:F1:E6:2F:79:5C (public) level 1 err 1
E: reason 0x4
Security failed: F8:F1:E6:2F:79:5C (public) level 1 err 1
E: reason 0x4
Security failed: F8:F1:E6:2F:79:5C (public) level 1 err 1
Disconnected from F8:F1:E6:2F:79:5C (public) (reason 19) 

[Sigurd Hellesvik]

Hi Tim,

Is the Bluetooth: NFC pairing example what you are looking for?

Regards,
Sigurd Hellesvik

[Tim Hwang]

Hello.

I already checked that sample.
As I told you, we're using custom tag not attached to nordic chip.
How can I use it as BLE tag?

in addition. it seems security level is mismatch. I'm expecting mode 4 but actually 1. Can I change it?
00> HS connected
00> HS Connected 56:50:EA:BC:F4:C3 (random)
00> pairing_accept conn: 56:50:EA:BC:F4:C3 (random)
00> io_capability: 4
00> auth_req: 2d
00> E: reason 0x4
00> Security failed: 56:50:EA:BC:F4:C3 (random) level 1 err 1
00> Pairing failed conn: 56:50:EA:BC:F4:C3 (random), reason 1 Disconnected: 56:50:EA:BC:F4:C3 (random) (reason 22)

[Sigurd Hellesvik]

Hi,

Q1. In case we use classic tag, can I connect to BLE without BLE scan? (in my test, I know that it is not easy)

You must scan to connect.

Q2. If we change classic tag to BLE tag, can we connect BLE without scan?

To avoid misunderstandings, can you specify "classic tag" and "BLE tag"?
For example send me links to product pages.

Regards,
Sigurd Hellesvik

[Tim Hwang]

Here is tag sample.
classic tag 56bytes
BLE tag is larger than classic.

[Sigurd Hellesvik]

Hi Tim,

What is that screenshot? Which app is it from?

Can you repeat what you need assistance with?

Regards,
Sigurd Hellesvik

[Tim Hwang]

Screenshot is from NXP app.

reason 0x4
-> 
#define BT_SMP_ERR_CONFIRM_FAILED 0x04
I could find 0x04 in smp.h. I have no idea what made this error.

Can I user BLE tag not attached nordic 52832?

[Sigurd Hellesvik]

Hi Tim,

Regarding my previous comment:

Sigurd Hellesvik said:

You must scan to connect.

I realize that I might have spoken too hasty.

As long as the peripheral advertises, you might be able to connect without scanning.
However, if that is supported depends on Android.
I suggest you contact experts on Android development to get an answer on this.

Regards,
Sigurd Hellesvik

[Tim Hwang]

Thank you! If need, We will make another case someday.