If you look at Bluetooth Core Spec 4.1, p1141, you’ll see the description for the status. 0 means Encryption Change has occurred.
6 means PIN or key Missing, this happens when you reconnect to a slave but it’s link key was missed. (probably due to reflash image)
8 means Connection Timeout, this happens when either master or slave doesn’t respond to the connection. for example, when out-of-range you’ll see it.
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Thank you for the answer.