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From:   Miao-chen Chou <mcchou@chromium.org>
Date:   Tue, 28 Apr 2020 15:02:24 -0700
Message-ID: <CABmPvSGkW9=f7uFVfwiLB7-UiMm+C6-d+Y7UX+4iw6Hy0YCE=A@mail.gmail.com>
Subject: Re: [BlueZ PATCH v4] doc: Add Advertisement Monitoring API
To:     Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Cc:     Bluetooth Kernel Mailing List <linux-bluetooth@vger.kernel.org>,
        Michael Sun <michaelfsun@google.com>,
        Luiz Augusto von Dentz <luiz.von.dentz@intel.com>,
        Marcel Holtmann <marcel@holtmann.org>,
        Yoni Shavit <yshavit@chromium.org>,
        Alain Michaud <alainm@chromium.org>
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Great! Thank you so much.

On Mon, Apr 27, 2020 at 2:38 PM Luiz Augusto von Dentz
<luiz.dentz@gmail.com> wrote:
>
> Hi Miao,
>
> On Mon, Apr 27, 2020 at 1:16 PM Miao-chen Chou <mcchou@chromium.org> wrote:
> >
> > This patch proposes an Advertisement Monitoring API for an application to
> > register a job of monitoring ADV reports with content filter and RSSI
> > thresholds.
> > ---
> >
> > Changes in v4:
> > - Change the signature of SupportedMonitorTypes to be array of strings.
> > - Fix document formatting.
> >
> > Changes in v3:
> > - Introduce SupportedFeatures to reflect the features based on
> > controller's capabilities.
> > - Modify SupportedMonitorTypes to list available types of monitors.
> >
> > Changes in v2:
> > - Rename the interfaces and functions.
> > - Adopt the object manager mechanism so that a client can expose
> > multiple monitor objects and expect to get notified on whether the
> > monitor has been activated or not.
> > - Change the contract of DeviceFound so that it is called to indicate
> > the starting point of monitoring on a device instead of reporting every
> > ADV. In other words, the client is expected to monitor corresponding
> > device events.
> >
> >  doc/advertisement-monitor-api.txt | 137 ++++++++++++++++++++++++++++++
> >  1 file changed, 137 insertions(+)
> >  create mode 100644 doc/advertisement-monitor-api.txt
> >
> > diff --git a/doc/advertisement-monitor-api.txt b/doc/advertisement-monitor-api.txt
> > new file mode 100644
> > index 000000000..012fce420
> > --- /dev/null
> > +++ b/doc/advertisement-monitor-api.txt
> > @@ -0,0 +1,137 @@
> > +BlueZ D-Bus Advertisement Monitor API Description
> > +*************************************************
> > +
> > +This API allows an client to specify a job of monitoring advertisements by
> > +registering the root of hierarchy and then exposing advertisement monitors
> > +under the root with filtering conditions, thresholds of RSSI and timers
> > +of RSSI thresholds.
> > +
> > +Once a monitoring job is activated by BlueZ, the client can expect to get
> > +notified on the targeted advertisements no matter if there is an ongoing
> > +discovery session (a discovery session is started/stopped with methods in
> > +org.bluez.Adapter1 interface).
> > +
> > +Advertisement Monitor hierarchy
> > +===============================
> > +Service                org.bluez
> > +Interface      org.bluez.AdvertisementMonitor1 [experimental]
> > +Object path    freely definable
> > +
> > +Methods                void Release() [noreply]
> > +
> > +                       This gets called as a signal for a client to perform
> > +                       clean-up when (1)a monitor cannot be activated after it
> > +                       was exposed or (2)a monitor has been deactivated.
> > +
> > +               void Activate() [noreply]
> > +
> > +                       After a monitor was exposed, this gets called as a
> > +                       signal for client to get acknowledged when a monitor
> > +                       has been activated, so the client can expect to receive
> > +                       calls on DeviceFound() or DeviceLost().
> > +
> > +               void DeviceFound(object device) [noreply]
> > +
> > +                       This gets called to notify the client of finding the
> > +                       targeted device. Once receiving the call, the client
> > +                       should start to monitor the corresponding device to
> > +                       retrieve the changes on RSSI and advertisement content.
> > +
> > +               void DeviceLost(object device) [noreply]
> > +
> > +                       This gets called to notify the client of losing the
> > +                       targeted device. Once receiving this call, the client
> > +                       should stop monitoring the corresponding device.
> > +
> > +Properties     uint8 Type [read-only]
> > +
> > +                       The type of the monitor. See SupportedMonitorTypes in
> > +                       org.bluez.AdvertisementMonitorManager1 for the available
> > +                       options.
> > +
> > +               (Int16, Uint16, Int16, Uint16) RSSIThreshholdsAndTimers [read-only, optional]
> > +
> > +                       This contains HighRSSIThreshold, HighRSSIThresholdTimer,
> > +                       LowRSSIThreshold, LowRSSIThresholdTimer in order. The
> > +                       unit of HighRSSIThreshold and LowRSSIThreshold is dBm.
> > +                       The unit of HighRSSIThresholdTimer and
> > +                       LowRSSIThresholdTimer is second.
> > +
> > +                       If these are provided, RSSI would be used as a factor to
> > +                       notify the client of whether a device stays in range or
> > +                       move out of range. A device is considered in-range when
> > +                       the RSSIs of the received advertisement(s) during
> > +                       HighRSSIThresholdTimer seconds exceed HighRSSIThreshold.
> > +                       Likewise, a device is considered out-of-range when the
> > +                       RSSIs of the received advertisement(s) during
> > +                       LowRSSIThresholdTimer do not reach LowRSSIThreshold.
> > +
> > +               array{(uint8, uint8, string)} Patterns [read-only, optional]
> > +
> > +                       If Type is set to 0x01, this must exist and has at least
> > +                       one entry in the array.
> > +
> > +                       The structure of a pattern contains the following.
> > +                       uint8 start_position
> > +                               The index in an AD data field where the search
> > +                               should start. The beginning of an AD data field
> > +                               is index 0.
> > +                       uint8 AD_data_type
> > +                               See https://www.bluetooth.com/specifications/
> > +                               assigned-numbers/generic-access-profile/ for
> > +                               the possible allowed value.
> > +                       string content_of_pattern
> > +                               This is the value of the pattern.
> > +
> > +Advertisement Monitor Manager hierarchy
> > +=======================================
> > +Service                org.bluez
> > +Interface      org.bluez.AdvertisementMonitorManager1 [experimental]
> > +Object path    /org/bluez/{hci0,hci1,...}
> > +
> > +Methods                void RegisterApplication(object application)
> > +
> > +                       This registers a hierarchy of advertisement monitors.
> > +                       The application object path together with the D-Bus
> > +                       system bus connection ID define the identification of
> > +                       the application registering advertisement monitors.
> > +
> > +                       Possible errors: org.bluez.Error.InvalidArguments
> > +                                        org.bluez.Error.AlreadyExists
> > +
> > +               void UnregisterApplication(object application)
> > +
> > +                       This unregisters advertisement monitors that have been
> > +                       previously registered. The object path parameter must
> > +                       match the same value that has been used on
> > +                       registration.
> > +
> > +                       Possible errors: org.bluez.Error.InvalidArguments
> > +                                        org.bluez.Error.DoesNotExist
> > +
> > +Properties     array{string} SupportedMonitorTypes [read-only]
> > +
> > +                       This lists the supported types of advertisement
> > +                       monitors. An application should check this before
> > +                       instantiate and expose an object of
> > +                       org.bluez.AdvertisementMonitor1.
> > +
> > +                       Possible values for monitor types:
> > +
> > +                       "patterns_with_logic_or"
> > +                               Patterns with logic OR applied. With this type,
> > +                               property "Patterns" must exist and has at least
> > +                               one pattern.
> > +
> > +               array{string} SupportedFeatures [read-only]
> > +
> > +                       This lists the features of advertisement monitoring
> > +                       supported by BlueZ.
> > +
> > +                       Possible values for features:
> > +
> > +                       "controller-based-monitor-by-patterns"
> > +                               If the controller is capable of performing
> > +                               advertisement monitoring by patterns, BlueZ
> > +                               would offload the patterns to the controller to
> > +                               reduce power consumption.
> > --
> > 2.24.1
>
> Applied, thanks, note that I did change the Type to be string as well
> so we is consistent with SupportMonitorTypes.
>
> --
> Luiz Augusto von Dentz