Device stops advertising after deleting a bond, recreating it and disconnecting

[mmnano]

Hello,

There is a small problem that I don't know how to solve. I tried looking for it but to no avail. Essentially, my device which runs on NCS v1.7.0 will stop advertising if:

1. Connect and create a bond with a phone
2. Disconnect and delete the bond with the phone
3. Reconnect and re-create a bond
4. Disconnect

From there, the device stops advertising altogether unless it is reset.

You'll find attached a sample where recreating the problem is fairly easy, it runs on nrf52840dk_nrf52840 or similar. I just encrypted the Heart Rate Service measurement characteristic to be able to prompt a pairing request by subscribing to that notification.

Disconnect_Forget_Advertisement.zip

I am sure that I am missing something but I cannot find what.

Thank you in advance for your help,

[Simon]

1. Flashed your sample (Disconnect_Forget_Advertisement) using NCS v1.7.0 to an nRF52840DK v2.0.1
2. Then I opened the nRF Connect for mobile app using Galaxy A22 5G and I found the device advertising
3. I bonded and connected with the device:                                                                                                                                                                                     
4. Then I disconnected and removed the bond info                                                                                                                                                                                     
5. I reconnected and created a bond again (see images in point 2)
6. Eventually I disconnected                                                                                                                                                                                                                         

But I did see the device advertising after this:

Did I follow the exact same steps as you? What is difference between my steps/setup and yours?

Best regards,

Simon

[mmnano]

Hello,

Thank you for your time.

This looks like the same steps.

However, for what it's worth, I changed the general architecture to something like here: Non-connectable advertising while connected or bonded in nRF Connect SDK - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)

And now I don't have that problem.

Best regards,

[Simon]

Ah, okay. I'm happy you found a workaround