Reason

Connection attempt was canceled.

Insufficient authentication.

The device got out of range or has turned off.

The disconnection happened because (at least) one of the required services was not found on the device.

The disconnection was initiated by the user.

The local device initiated disconnection.

The remote device initiated graceful disconnection.

The connection attempt timed out.

The remote device terminated the connection because it did not accept the connection parameters (HCI error 0x3B, Unacceptable Connection Parameters).

Unknown error.

Connection attempt was aborted due to an unsupported address.

Connection attempt was aborted due PHY negotiations failure.