PeerManager error (error: 139)

[takashina hiroki]

I have a question about PeerManager.

SDK: 15.3.0
example: ble_app_multirole_lesc (I changed the source from the sample)
using device: EYSHJNZWZ (nRF52832)
connection device: Android (Bluetooth v5.0)

When trying to connect with LESC security level using PeerManager, the following error occurred.
Please tell me the cause.

<info> peer_manager_handler: Connection security failed: role: Peripheral, conn_handle: 0x2, procedure: Bonding, error: 139
<warning> peer_manager_handler: Disconnecting conn_handle 2.

I know that this error means "BLE_GAP_SEC_STATUS_DHKEY_FAILURE".
The connection partner supports pairing.
I confirmed that I could connect many times.
However, this error may occur.
Also, after this error occurs, the same error will occur no matter how many times you try to connect.
This error does not occur after reset.

[Edvin]

Hello,

As you say, it looks like it is BLE_GAP_SEC_STATUS_DHKEY_FAILURE. Do you use bonding when you are reproducing this?

Can you do a sniffer trace of the connection when this occurs? You can use the nRF Sniffer.

[takashina hiroki]

Yes, I use bonding.

I do not have nRF Sniffer.
Therefore, sniffer trace can not be performed.

Is there any other way to investigate the cause?

[Edvin]

Edvin said:

Do you use bonding when you are reproducing this?

 Are both of the devices nRF? If so, can you try to delete the entire flash of both devices, and then try again? If one of the devices is a phone, try to "forget device" to erase the bonding information (stored keys), and delete the flash on the other, so that you have a clean start. 

 

takashina hiroki said:

I do not have nRF Sniffer.

 So do you have another DK? nRF Sniffer is only FW, which runs on another DK. It is a very useful tool for these kind of problems, and in BLE development in general.

Best regards,

Edvin

[takashina hiroki]

One device is nRF and the other is Android.
nRF needs to be bonded to multiple devices.
If you delete the entire flash, other devices' bonding information will also disappear.
Therefore, this method is not preferable.
Are there any other measures?
Also, if you know the root cause, please let me know.

[takashina hiroki]

I have the following devices.
BMD-300-EVAL (Rigado)

Can nRF Sniffer run on this device?

[Edvin]

takashina hiroki said:

Can nRF Sniffer run on this device?

 No. Sorry.

 

takashina hiroki said:

If you delete the entire flash, other devices' bonding information will also disappear.
Therefore, this method is not preferable.

 This is not a permanent solution, but for debugging, and to find the cause of the issue.