Hi,
I'm connecting to a BLE oximeter device. The first couple of connects
succeed. But after that the connection always fails. I have tried with
both gatttool and with my own code. hcidump shows that the "LE Start
Encryption" command fails with "PIN or Key Missing". If I delete the
pairing (that was created by the earlier successful connection) then
subsequent connects will succeed for a few times again.
I analysed the hcidumps of successful and failed connects. In the failed
case, it looks to me like bluez is not sending out an SMP PairingRequest
in response to an SMP SecurityRequest from the slave. I can see in the
kernel code that smp_cmd_security_req() does not send out the
PairingRequest if it finds an LTK. But is that correct? Should it not
try to pair anyway because the remote device is requesting it and may
have deleted the earlier bonding.
I can provide the detailed hcidumps if anyone needs that.
Thanks.
Alan
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