Hi list, How do I connect to a BLE device using security mode 1 level 3 please? With bluetoothctl, I do not see any way to do this. Instead, I connected and then paired. It said success in both cases, but then one of my write requests is failing with "Error: Insufficient authentication (5)" which I assume means that I did not get to level 3. I tried also with btgatt-client provided in bluez/tools. I specified "high" (-s high) level but I get the same issue: error 5. I had a look at the security mode with "get-security" and it told me I was using level 1 :( I set it back to level 3, but actually that does not seem to do anything, it remains at level 1 ! sudo ./btgatt-client --t random -s high -v -d MAC-ADDRESS [GATT client]# write-value 0x0014 0xFF 0xFF... [GATT client]# att: ATT op 0x12 [GATT client]# att: < 12 14 00 ff ff ff ff ff ff ff ff [GATT client]# att: > 01 12 14 00 05 [GATT client]# att: ATT response received: 0x01 [GATT client]# att: Retrying operation 0xb0d160 ... [GATT client]# get-security Security level: 1 [GATT client]# set-security 3 Setting security level 3 success [GATT client]# get-security Security level: 1 I am using Bluez 5.50 on a Linux Mint host. Thanks, Axelle
