[Bug 187871] New: Bluetooth LE advertising interval: Using same value for max and min

[Bug 187871] New: Bluetooth LE advertising interval: Using same value for max and min

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=187871

            Bug ID: 187871
           Summary: Bluetooth LE advertising interval: Using same value
                    for max and min
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.9
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Bluetooth
          Assignee: linux-bluetooth@vger.kernel.org
          Reporter: gardarh@gmail.com
        Regression: No

The Bluetooth Core Specification 4.2, Vol 2, Part E, Section 7.8.5 states the
following:

"The Advertising_Interval_Min and Advertising_Interval_Max should not be the
same value to enable the Controller to determine the best advertising interval
given other activities."

However, I noticed when inspecting hci commands through btmon that bluez is
setting Advertising_Interval_Min and Advertising_Interval_Max to 0x800. A more
appropriate solution would be to modify either, e.g. set
Advertising_Interval_Min to 0x600.

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[Bug 187871] Bluetooth LE advertising interval: Using same value for max and min

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=187871

Joseph Hwang <josephsih@chromium.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |josephsih@chromium.org

--- Comment #1 from Joseph Hwang <josephsih@chromium.org> ---
On page 969 of the same Section 7.8.5 in the specification, it states that the
default values of both Advertising_Interval_Min and Advertising_Interval_Max
are 0x0800 (1.28 seconds).

When setting distinct Advertising_Interval_Min and Advertising_Interval_Max
values, a controller may pick up any value between the range. The chosen value
might be different from the default 1.28 seconds that a user expects, and may
keep changing each time after reboot depending on the controller's behavior.
That could be a bit confusing though.

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