Problem with changing security level in connection established with BLE Shell

[irgu]

Hi,

I have a problem with unmodified BLE Shell and changing security level to 2(aka just works).

1. I'm connecting from BLE Shell to the device that requires level 2
2. After the connection is succesfully established I'm trying to perform bt security 2
3. It fails and outputs some strange communicates

Why it mentions level 1 when I tried to change it to 2?

The device works great with Android and iOS phones. It also worked some time ago with previous versions of BLE Shell, but it doesn't work on latest ones.

uart:~$ > bt connect D6:32:F3:DB:E1:DA random
bt connect D6:32:F3:DB:E1:DA random
Connection pending
Connected: D6:32:F3:DB:E1:DA (random)
LE data len updated: TX (len: 27 time: 328) RX (len: 69 time: 664)
Remote LMP version 5.1 (0x0a) subversion 0x0101 manufacturer 0x0059
LE Features: 0x0000000000004125 
LE PHY updated: TX PHY LE 2M, RX PHY LE 2M
LE data len updated: TX (len: 27 time: 328) RX (len: 27 time: 664)
uart:~$ > bt security 2
bt security 2
Security failed: D6:32:F3:DB:E1:DA (random) level 1 reason: Authentication requirements (4)
Pairing failed with D6:32:F3:DB:E1:DA (random) reason: Authentication requirements (4)
uart:~$

[ldomaigne]

Why it mentions level 1 when I tried to change it to 2?

My guess: it prints the current level. And since the switch the level 2 fails, it is still in level 1.

The issue you are facing might be a regression. Based on the BT manufacturer ID (0x0059), you seem to be working with a Nordic board. Are you using Nordic NCS SDK? If so, I suggest using the Nordic DevZone Q&A.

Hope this helps!