Bluez 5.39 Secure Connection (SC) and uncompliant devices

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Environment:

- linux kernel 4.2.0 i686
- Ubuntu 15.10 distribution
- Bluez 5.39 compiled from source (--enable-experimental --enable-library)

I'm trying to pair my Broadcom BCM20702A0 dongle with the BLE device
"Xiaomi MiBand".

I've figured out that the MiBand does not support the following pairing request:

> Authentication requirement: Bonding, MITM, **SC**, No Keypresses (0x0d)


The response is the following:

> > ACL Data RX: Handle 32 flags 0x02 dlen 6
>       SMP: Pairing Failed (0x05) len 1
>         Reason: Invalid parameters (0x0a)


The problem seems to reside in the "SC" requirement: I've found
someone sharing the same problem on the Chromium Project's tracking
system ==> https://bugs.chromium.org/p/chromium/issues/detail?id=522965

Is it possible to loosen the requirements in the request (expecially
"SC"), so that it won't be rejected by the MiBand device?

Thanks in advance for your support,


Roberto
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