Bluetooth communication without pairing, connectable, non-scannable and non-direct advertising.

RE: Bluetooth communication without pairing, connectable, non-scannable and non-direct advertising.

Hung Bui — Thu, 19 Dec 2024 09:23:18 GMT

Hi Adrian,
Could you explain why you think BLE_GAP_ADV_TYPE_EXTENDED_CONNECTABLE_NONSCANNABLE_UNDIRECTED matches with your need ?

As I said, even non-scannable will still show up in the list if you have the correct UUID in the advertising packet (HID device for example).
And for normal advertising, if you want non-scannable, simply don't add scan response packet to the advertising.

RE: Bluetooth communication without pairing, connectable, non-scannable and non-direct advertising.

agallende — Thu, 19 Dec 2024 07:58:14 GMT

Thanks for the answer and the example, I'm looking into it.

Looking for more information, I find this extended advertising mode that fits what I want to do: BLE_GAP_ADV_TYPE_EXTENDED_CONNECTABLE_NONSCANNABLE_UNDIRECTED

Could we confirm that it is possible to use this configuration, does anyone have an example to test it?

Thank you very much.

RE: Bluetooth communication without pairing, connectable, non-scannable and non-direct advertising.

Hung Bui — Wed, 18 Dec 2024 10:15:14 GMT

Hi Adrian,

Usually the bluetooth setting list only show device which has some special/common UUID in the advertising packet (for example HID, audio etc) or device already paird with the phone.
If your device doesn't advertise those UUID, it will not show up in the list. Have you tried for example peripheral_uart example ?

Note that the device will still show up in the BLE scanner app, for example nRF Connect app on mobile.

RE: Bluetooth communication without pairing, connectable, non-scannable and non-direct advertising.

agallende — Tue, 17 Dec 2024 23:56:26 GMT

Thank you very much for your reply.

I have a commercial device, Mantis X8, which when switched on is only detected from its own application, it does not appear in the operating system list and does not need to be paired. I am looking for a similar operation to this one.

At first I thought it would use broadcast advertising messages to send data, and receive data through the scans, but I would like to think that it could be a better direct communication.

Thank you.

RE: Bluetooth communication without pairing, connectable, non-scannable and non-direct advertising.

Hung Bui — Tue, 17 Dec 2024 13:33:06 GMT

Hi Adrian,
I don't think what you want to make is possible.

Non-scannable here doesn't mean it will not appear on scanning list of other device. Non-scannable here means that it will not send scan response when there is a scan request.

If you don't want your device to be connected unwanted central, you can use Filter accept list. You can take a look here: https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/lessons/lesson-5-bluetooth-le-security-fundamentals/topic/blefund-lesson-5-exercise-2/