Hi all,
I am seeing an error during the LE pairing process which makes the pairing to fail. I have two DUTs which uses the Marvell 88W8897.
Here are my BT settings for both master and slave:
Master:
$ btmgmt info
current settings: powered connectable discoverable bondable ssp br/edr le secure-conn
Slave:
$ btmgmt info
Current settings: powered connectable bondable le advertising secure-conn
When I initiate the pairing process from the master, I observed the message:
"Bluetooth: hci0 unexpected SMP command 0x0a from 74:c6:3b:ab:68:ea"
Where 74:c6:3b:ab:68:ea is the address of the slave device.
In the btmon log of the master device, it is observed that after the Slave device has transmitted the keys, the Master does not transmit it. Hence, the Slave is not receiving the keys and thus disconnects the link and pairing is failed.
> ACL Data RX: Handle 128 flags 0x02 dlen 21 [hci0] 124.801098
SMP: Encryption Information (0x06) len 16
Long term key: 9ac691e96e85e82ca68f4b6d2abec80f
> HCI Event: Encryption Change (0x08) plen 4 [hci0] 124.801261
Status: Success (0x00)
Handle: 128
Encryption: Enabled with AES-CCM (0x01)
> ACL Data RX: Handle 128 flags 0x02 dlen 15 [hci0] 124.812761
SMP: Master Identification (0x07) len 10
EDIV: 0xea3f
Rand: 0x806e542a78f55d7c
> ACL Data RX: Handle 128 flags 0x02 dlen 21 [hci0] 124.812782
SMP: Signing Information (0x0a) len 16
Signature key: 4451b8ae0eff90f0a47fb96be53479fb
> HCI Event: Disconnect Complete (0x05) plen 4 [hci0] 154.839591
Status: Success (0x00)
Handle: 128
Reason: Remote User Terminated Connection (0x13)
=> At this point, Master should start sending LTK to slave, but Master doesn't send the LTK so Slave disconnects the link and pairing is failed.
What could possibly cause the master to not send the LTK? My kernel version is v4.1.27 and bluez stack is v5.40. I would appreciate advice on this.
Thank you.
~Joshua
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