[NUS - Peripheral & Central] error of Set security : -12

RE: [NUS - Peripheral & Central] error of Set security : -12

Hung Bui — Tue, 27 Aug 2024 07:50:17 GMT

Hi Seongmin,
For example when your phone is paired with your Bluetooth headset. And when you turn off and on your Bluetooth headset (or when it run out of battery) you don't have to re-bond/pair with the phone again, correct ?
To be able to do that the device has to store the bond information on non-volatile memory so that when it reset/power on-off it doesn't lose bond information.

In your case, you get error -12 could be because on one side of the connection the bond information has for some reason been erased when the other device still keep the bond information and it won't allow a new bond until the current bond information has been erased.

RE: [NUS - Peripheral & Central] error of Set security : -12

seongmincho — Tue, 27 Aug 2024 04:08:54 GMT

Yes, it's been resolved. Thank you.

Could you tell me more specifically about 'bond/pair information is stored in non-volatile memory'?"

RE: [NUS - Peripheral & Central] error of Set security : -12

Hung Bui — Mon, 26 Aug 2024 12:57:54 GMT

Have you solved the problem ? If you not please don't click Verified Answer.

Please clarify if you do a full erase you fix the issue.

Yes bond/pair information is stored in non-volatile memory. This way when you restart the device it would be able to connect and reencrypt the link with paired device.

RE: [NUS - Peripheral & Central] error of Set security : -12

seongmincho — Fri, 23 Aug 2024 11:47:37 GMT

Thanks for the great tip!

Is there a fundamental way to solve this issue? I think I might have read somewhere that paired devices are stored in non-volatile memory

RE: [NUS - Peripheral & Central] error of Set security : -12

Hung Bui — Fri, 23 Aug 2024 10:02:14 GMT

Hi,
To completely erase the chip you would need to click the double arrow:

RE: [NUS - Peripheral & Central] error of Set security : -12

seongmincho — Fri, 23 Aug 2024 07:20:50 GMT

[quote userid="2121" url="~/f/nordic-q-a/114122/nus---peripheral-central-error-of-set-security--12/499376"]So you are testing between 2 nRF52840 DK ? [/quote]

yes. i have three nRF52840 dk

[quote userid="2121" url="~/f/nordic-q-a/114122/nus---peripheral-central-error-of-set-security--12/499376"]Please make sure you erase the chip completely before testing. If they have already bonded before you test you may get the error. [/quote]

My development environment is as follows: [Toolchain Manager: v1.3.0, IDE: Visual Studio Code (VSCode), SDK: ncs v2.6.0, Windows 11 Pro].

So, when I flash, doesn't it automatically get completely erased?

RE: [NUS - Peripheral & Central] error of Set security : -12

Hung Bui — Thu, 22 Aug 2024 12:50:47 GMT

Hi Seongmin,

So you are testing between 2 nRF52840 DK ?

Please make sure you erase the chip completely before testing. If they have already bonded before you test you may get the error.

Please try to capture a sniffer trace each time you test so we can find the difference.
We have a course on how to use the sniffer:
https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/lessons/lesson-6-bluetooth-le-sniffer/