The DsoCommand class implements the dso CLI command. More...

Inheritance diagram for DsoCommand:

Collaboration diagram for DsoCommand:

Public Slots
QStringList	processOptions (const QCommandLineParser &parser) override
	Processes the relevant options from the command line parser.

Public Slots inherited from DeviceCommand
bool	start () override
	Begins scanning for the Pokit device.

Public Slots inherited from AbstractCommand
virtual QStringList	processOptions (const QCommandLineParser &parser)
	Processes the relevant options from the command line parser.

virtual bool	start ()=0
	Begins the functionality of this command, and returns `true` if begun successfully, `false` otherwise.

Public Member Functions
	DsoCommand (QObject *const parent=nullptr)
	Construct a new DsoCommand object with parent.

QStringList	requiredOptions (const QCommandLineParser &parser) const override
	Returns a list of CLI option names required by this command.

QStringList	supportedOptions (const QCommandLineParser &parser) const override
	Returns a list of CLI option names supported by this command.

Public Member Functions inherited from DeviceCommand
	DeviceCommand (QObject *const parent=nullptr)
	Construct a new DeviceCommand object with parent.

Public Member Functions inherited from AbstractCommand
	AbstractCommand (QObject *const parent=nullptr)
	Constructs a new command with parent.

Public Member Functions inherited from QObject
virtual const QMetaObject *	metaObject () const const

	QObject (QObject *parent)

virtual bool	event (QEvent *e)

virtual bool	eventFilter (QObject watched, QEvent event)

QString	objectName () const const

void	setObjectName (const QString &name)

bool	isWidgetType () const const

bool	isWindowType () const const

bool	signalsBlocked () const const

bool	blockSignals (bool block)

QThread *	thread () const const

void	moveToThread (QThread *targetThread)

int	startTimer (int interval, Qt::TimerType timerType)

int	startTimer (std::chrono::milliseconds time, Qt::TimerType timerType)

void	killTimer (int id)

T	findChild (const QString &name, Qt::FindChildOptions options) const const

QList< T >	findChildren (const QString &name, Qt::FindChildOptions options) const const

QList< T >	findChildren (const QRegExp &regExp, Qt::FindChildOptions options) const const

QList< T >	findChildren (const QRegularExpression &re, Qt::FindChildOptions options) const const

const QObjectList &	children () const const

void	setParent (QObject *parent)

void	installEventFilter (QObject *filterObj)

void	removeEventFilter (QObject *obj)

QMetaObject::Connection	connect (const QObject sender, const char signal, const char *method, Qt::ConnectionType type) const const

bool	disconnect (const char signal, const QObject receiver, const char *method) const const

bool	disconnect (const QObject receiver, const char method) const const

void	dumpObjectTree ()

void	dumpObjectInfo ()

void	dumpObjectTree () const const

void	dumpObjectInfo () const const

bool	setProperty (const char *name, const QVariant &value)

QVariant	property (const char *name) const const

QList< QByteArray >	dynamicPropertyNames () const const

void	destroyed (QObject *obj)

void	objectNameChanged (const QString &objectName)

QObject *	parent () const const

bool	inherits (const char *className) const const

void	deleteLater ()

	Q_DISABLE_COPY (Class)

	Q_DISABLE_MOVE (Class)

	Q_DISABLE_COPY_MOVE (Class)

T	qobject_cast (QObject *object)

T	qobject_cast (const QObject *object)

T	qFindChild (const QObject *obj, const QString &name)

QList< T >	qFindChildren (const QObject *obj, const QString &name)

QList< T >	qFindChildren (const QObject *obj, const QRegExp &regExp)

	Q_CLASSINFO (Name, Value)

	Q_INTERFACES (...)

	Q_PROPERTY (...)

	Q_ENUMS (...)

	Q_FLAGS (...)

	Q_ENUM (...)

	Q_FLAG (...)

	Q_ENUM_NS (...)

	Q_FLAG_NS (...)

	Q_OBJECT Q_OBJECT

	Q_GADGET Q_GADGET

	Q_NAMESPACE Q_NAMESPACE

	Q_NAMESPACE_EXPORT (EXPORT_MACRO)

	Q_SIGNALS Q_SIGNALS

	Q_SIGNAL Q_SIGNAL

	Q_SLOTS Q_SLOTS

	Q_SLOT Q_SLOT

	Q_EMIT Q_EMIT

	Q_INVOKABLE Q_INVOKABLE

	Q_REVISION Q_REVISION

	Q_SET_OBJECT_NAME (Object)

	QT_NO_NARROWING_CONVERSIONS_IN_CONNECT QT_NO_NARROWING_CONVERSIONS_IN_CONNECT

Protected Slots
void	serviceDetailsDiscovered () override
	Handles service detail discovery events.

Protected Slots inherited from DeviceCommand
virtual void	controllerError (const QLowEnergyController::Error error)
	Handles controller error events.

virtual void	deviceDisconnected ()
	Handles device disconnection events.

virtual void	serviceError (const QLowEnergyService::ServiceError error)
	Handles service error events.

virtual void	serviceDetailsDiscovered ()
	Handles service detail discovery events.

Protected Slots inherited from AbstractCommand
virtual void	deviceDiscovered (const QBluetoothDeviceInfo &info)=0
	Handles PokitDiscoveryAgent::pokitDeviceDiscovered signal.

virtual void	deviceDiscoveryFinished ()=0
	Handles PokitDiscoveryAgent::deviceDiscoveryFinished signal.

Protected Member Functions
AbstractPokitService *	getService () override
	Returns a Pokit service object for the derived command class.

Protected Member Functions inherited from DeviceCommand
void	disconnect (int exitCode=EXIT_SUCCESS)
	Disconnects the underlying Pokit device, and sets exitCode to be return to the OS once the disconnection has taken place.

Protected Member Functions inherited from QObject
QObject *	sender () const const

int	senderSignalIndex () const const

int	receivers (const char *signal) const const

bool	isSignalConnected (const QMetaMethod &signal) const const

virtual void	timerEvent (QTimerEvent *event)

virtual void	childEvent (QChildEvent *event)

virtual void	customEvent (QEvent *event)

virtual void	connectNotify (const QMetaMethod &signal)

virtual void	disconnectNotify (const QMetaMethod &signal)

Private Slots
void	settingsWritten ()
	Invoked when the DSO settings have been written.

void	metadataRead (const DsoService::Metadata &data)
	Invoked when metadata has been received from the DSO.

void	outputSamples (const DsoService::Samples &samples)
	Outputs DSO samples in the selected output format.

Private Attributes
quint8(*	minRangeFunc )(const PokitProduct product, const quint32 maxValue)
	Pointer to function for converting rangeOptionValue to a Pokit device's range enumerator.

quint32	rangeOptionValue { 0 }
	The parsed value of range option.

DsoService *	service { nullptr }
	Bluetooth service this command interacts with.

DsoService::Settings	settings
	Settings for the Pokit device's DSO mode.

DsoService::Metadata	metadata
	Most recent DSO metadata.

qint32	samplesToGo { 0 }
	Number of samples we're expecting in the current window.

bool	showCsvHeader { true }
	Whether or not to show a header as the first line of CSV output.

Additional Inherited Members
Public Types inherited from AbstractCommand
enum class	OutputFormat { Csv , Json , Text }
	Supported output formats. More...

Static Public Member Functions inherited from AbstractCommand
static QString	escapeCsvField (const QString &field)
	Returns an RFC 4180 compliant version of field.

template<typename R>
static quint32	parseNumber (const QString &value, const QString &unit, const quint32 sensibleMinimum=0)
	Returns value as an integer multiple of the ratio R.

Static Public Member Functions inherited from QObject
QString	tr (const char sourceText, const char disambiguation, int n)

QString	trUtf8 (const char sourceText, const char disambiguation, int n)

QMetaObject::Connection	connect (const QObject sender, const char signal, const QObject receiver, const char method, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject sender, PointerToMemberFunction signal, const QObject receiver, PointerToMemberFunction method, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, Functor functor)

QMetaObject::Connection	connect (const QObject sender, PointerToMemberFunction signal, const QObject context, Functor functor, Qt::ConnectionType type)

bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char method)

bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method)

bool	disconnect (const QMetaObject::Connection &connection)

bool	disconnect (const QObject sender, PointerToMemberFunction signal, const QObject receiver, PointerToMemberFunction method)

Public Attributes inherited from QObject
typedef	QObjectList

Static Protected Member Functions inherited from DeviceCommand
template<typename T>
static T	minRange (const quint32 maxValue)

static quint8	minCapacitanceRange (const PokitProduct product, const quint32 maxValue)
	Returns the product's lowest capacitance range that can measure at least up to maxValue (nF), or AutoRange if no such range is available.

static quint8	minCurrentRange (const PokitProduct product, const quint32 maxValue)
	Returns the product's lowest current range that can measure at least up to maxValue (µA), or AutoRange if no such range is available.

static quint8	minResistanceRange (const PokitProduct product, const quint32 maxValue)
	Returns the product's lowest resistance range that can measure at least up to maxValue (Ω), or AutoRange if no such range is available.

static quint8	minVoltageRange (const PokitProduct product, const quint32 maxValue)
	t Returns the product's lowest voltage range that can measure at least up to maxValue (mV), or AutoRange if no such range is available.

Static Protected Member Functions inherited from AbstractCommand
static	Q_LOGGING_CATEGORY (lc, "dokit.cli.command", QtInfoMsg)
	Logging category for UI commands.

Protected Attributes inherited from DeviceCommand
PokitDevice *	device { nullptr }
	Pokit Bluetooth device (if any) this command interacts with.

int	exitCodeOnDisconnect { EXIT_FAILURE }
	Exit code to return on device disconnection.

Protected Attributes inherited from AbstractCommand
QString	deviceToScanFor
	Device (if any) that were passed to processOptions().

PokitDiscoveryAgent *	discoveryAgent
	Agent for Pokit device discovery.

OutputFormat	format { OutputFormat::Text }
	Selected output format.

Properties inherited from QObject
	objectName

Detailed Description

The DsoCommand class implements the dso CLI command.

Definition at line 10 of file dsocommand.h.

Constructor & Destructor Documentation

◆ DsoCommand()

DsoCommand::DsoCommand ( QObject *const parent = nullptr )

explicit

Construct a new DsoCommand object with parent.

Definition at line 25 of file dsocommand.cpp.

25 : DeviceCommand(parent)

26{

27

28}

DeviceCommand::DeviceCommand

DeviceCommand(QObject *const parent=nullptr)

Construct a new DeviceCommand object with parent.

Definition devicecommand.cpp:21

QObject::parent

QObject * parent() const const

References DeviceCommand::DeviceCommand(), QObject::parent(), and QObject::QObject().

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Member Function Documentation

◆ getService()

AbstractPokitService * DsoCommand::getService ( )

overrideprotectedvirtual

Returns a Pokit service object for the derived command class.

This override returns a pointer to a DsoService object.

Implements DeviceCommand.

Definition at line 170 of file dsocommand.cpp.

{
    Q_ASSERT(device);
    if (!service) {
        service = device->dso();
        Q_ASSERT(service);
        connect(service, &DsoService::settingsWritten,
                this, &DsoCommand::settingsWritten);
    }
    return service;
}

References QObject::connect(), DeviceCommand::device, service, settingsWritten(), and DsoService::settingsWritten().

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◆ metadataRead

void DsoCommand::metadataRead ( const DsoService::Metadata & data )

privateslot

Invoked when metadata has been received from the DSO.

Definition at line 228 of file dsocommand.cpp.

{
    qCDebug(lc) << "status:" << (int)(data.status);
    qCDebug(lc) << "scale:" << data.scale;
    qCDebug(lc) << "mode:" << DsoService::toString(data.mode);
    qCDebug(lc) << "range:" << service->toString(data.range, data.mode);
    qCDebug(lc) << "samplingWindow:" << (int)data.samplingWindow;
    qCDebug(lc) << "numberOfSamples:" << data.numberOfSamples;
    qCDebug(lc) << "samplingRate:" << data.samplingRate << "Hz";
    this->metadata = data;
    this->samplesToGo = data.numberOfSamples;
}

References metadata, DsoService::Metadata::mode, DsoService::Metadata::numberOfSamples, DsoService::Metadata::range, samplesToGo, DsoService::Metadata::samplingRate, DsoService::Metadata::samplingWindow, DsoService::Metadata::scale, service, DsoService::Metadata::status, and DsoService::toString().

Referenced by settingsWritten().

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◆ outputSamples

void DsoCommand::outputSamples ( const DsoService::Samples & samples )

privateslot

Outputs DSO samples in the selected output format.

Definition at line 244 of file dsocommand.cpp.

{
    QString unit;
    switch (metadata.mode) {
    case DsoService::Mode::DcVoltage: unit = u"Vdc"_s; break;
    case DsoService::Mode::AcVoltage: unit = u"Vac"_s; break;
    case DsoService::Mode::DcCurrent: unit = u"Adc"_s; break;
    case DsoService::Mode::AcCurrent: unit = u"Aac"_s; break;
    default:
        qCDebug(lc).noquote() << tr(R"(No known unit for mode %1 "%2".)").arg((int)metadata.mode)
            .arg(DsoService::toString(metadata.mode));
    }
    const QString range = service->toString(metadata.range, metadata.mode);
 
    for (const qint16 &sample: samples) {
        static int sampleNumber = 0; ++sampleNumber;
        const float value = sample * metadata.scale;
        switch (format) {
        case OutputFormat::Csv:
            for (; showCsvHeader; showCsvHeader = false) {
                std::cout << qUtf8Printable(tr("sample_number,value,unit,range\n"));
            }
            std::cout << qUtf8Printable(QString::fromLatin1("%1,%2,%3,%4\n")
                .arg(sampleNumber).arg(value).arg(unit, range));
            break;
        case OutputFormat::Json:
            std::cout << QJsonDocument(QJsonObject{
                    { u"value"_s,  value },
                    { u"unit"_s,   unit },
                    { u"range"_s,  range },
                    { u"mode"_s,   DsoService::toString(metadata.mode) },
                }).toJson().toStdString();
            break;
        case OutputFormat::Text:
            std::cout << qUtf8Printable(tr("%1 %2 %3\n").arg(sampleNumber).arg(value).arg(unit));
            break;
        }
        --samplesToGo;
    }
    if (samplesToGo <= 0) {
        qCInfo(lc).noquote() << tr("Finished fetching %Ln sample/s (with %L2 to remaining).",
            nullptr, metadata.numberOfSamples).arg(samplesToGo);
        if (device) disconnect(); // Will exit the application once disconnected.
    }
}

References DsoService::AcCurrent, DsoService::AcVoltage, QString::arg(), AbstractCommand::Csv, DsoService::DcCurrent, DsoService::DcVoltage, DeviceCommand::device, DeviceCommand::disconnect(), AbstractCommand::format, QString::fromLatin1(), AbstractCommand::Json, metadata, samplesToGo, service, showCsvHeader, AbstractCommand::Text, DsoService::toString(), and QObject::tr().

Referenced by settingsWritten().

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◆ processOptions

QStringList DsoCommand::processOptions ( const QCommandLineParser & parser )

overrideslot

Processes the relevant options from the command line parser.

This implementation extends DeviceCommand::processOptions to process additional CLI options supported (or required) by this command.

Definition at line 54 of file dsocommand.cpp.

{
    QStringList errors = DeviceCommand::processOptions(parser);
    if (!errors.isEmpty()) {
        return errors;
    }
 
    // Parse the (required) mode option.
    if (const QString mode = parser.value(u"mode"_s).trimmed().toLower();
        mode.startsWith(u"ac v"_s) || mode.startsWith(u"vac"_s)) {
        settings.mode = DsoService::Mode::AcVoltage;
    } else if (mode.startsWith(u"dc v"_s) || mode.startsWith(u"vdc"_s)) {
        settings.mode = DsoService::Mode::DcVoltage;
    } else if (mode.startsWith(u"ac c"_s) || mode.startsWith(u"aac"_s)) {
        settings.mode = DsoService::Mode::AcCurrent;
    } else if (mode.startsWith(u"dc c"_s) || mode.startsWith(u"adc"_s)) {
        settings.mode = DsoService::Mode::DcCurrent;
    } else {
        errors.append(tr("Unknown DSO mode: %1").arg(parser.value(u"mode"_s)));
        return errors;
    }
 
    // Parse the (required) range option.
    QString unit;
    {
        const QString value = parser.value(u"range"_s);
        quint32 sensibleMinimum = 0;
        switch (settings.mode) {
        case DsoService::Mode::Idle:
            Q_ASSERT(false); // Not possible, since the mode parsing above never allows Idle.
            break;
        case DsoService::Mode::DcVoltage:
        case DsoService::Mode::AcVoltage:
            minRangeFunc = minVoltageRange;
            unit = u"V"_s;
            sensibleMinimum = 50; // mV.
            break;
        case DsoService::Mode::DcCurrent:
        case DsoService::Mode::AcCurrent:
            minRangeFunc = minCurrentRange;
            unit = u"A"_s;
            sensibleMinimum = 5; // mA.
            break;
        }
        Q_ASSERT(!unit.isEmpty());
        rangeOptionValue = parseNumber<std::milli>(value, unit, sensibleMinimum);
        if (rangeOptionValue == 0) {
            errors.append(tr("Invalid range value: %1").arg(value));
        }
    }
 
    // Parse the trigger-level option.
    if (parser.isSet(u"trigger-level"_s)) {
        const QString value = parser.value(u"trigger-level"_s);
        const quint32 level = parseNumber<std::micro>(value, unit);
        if (level == 0) {
            errors.append(tr("Invalid trigger-level value: %1").arg(value));
        } else {
            settings.triggerLevel = (float)(level/1'000'000.0);
        }
    }
 
    // Parse the trigger-mode option.
    if (parser.isSet(u"trigger-mode"_s)) {
        const QString triggerMode = parser.value(u"trigger-mode"_s).trimmed().toLower();
        if (triggerMode.startsWith(u"free"_s)) {
            settings.command = DsoService::Command::FreeRunning;
        } else if (triggerMode.startsWith(u"ris"_s)) {
           settings.command = DsoService::Command::RisingEdgeTrigger;
        } else if (triggerMode.startsWith(u"fall"_s)) {
            settings.command = DsoService::Command::FallingEdgeTrigger;
        } else {
            errors.append(tr("Unknown trigger mode: %1").arg(parser.value(u"trigger-mode"_s)));
        }
    }
 
    // Ensure that if either trigger option is present, then both are.
    if (parser.isSet(u"trigger-level"_s) != parser.isSet(u"trigger-mode"_s)) {
        errors.append(tr("If either option is provided, then both must be: trigger-level, trigger-mode"));
    }
 
    // Parse the interval option.
    if (parser.isSet(u"interval"_s)) {
        const QString value = parser.value(u"interval"_s);
        const quint32 interval = parseNumber<std::micro>(value, u"s"_s, 500'000);
        if (interval == 0) {
            errors.append(tr("Invalid interval value: %1").arg(value));
        } else {
            settings.samplingWindow = interval;
        }
    }
 
    // Parse the samples option.
    if (parser.isSet(u"samples"_s)) {
        const QString value = parser.value(u"samples"_s);
        const quint32 samples = parseNumber<std::ratio<1>>(value, u"S"_s);
        if (samples == 0) {
            errors.append(tr("Invalid samples value: %1").arg(value));
        } else if (samples > std::numeric_limits<quint16>::max()) {
            errors.append(tr("Samples value (%1) must be no greater than %2")
                .arg(value).arg(std::numeric_limits<quint16>::max()));
        } else {
            if (samples > 8192) {
                qCWarning(lc).noquote() << tr("Pokit devices do not officially support great than 8192 samples");
            }
            settings.numberOfSamples = (quint16)samples;
        }
    }
    return errors;
}

References DsoService::AcCurrent, DsoService::AcVoltage, QList::append(), DsoService::DcCurrent, DsoService::DcVoltage, DsoService::FallingEdgeTrigger, DsoService::FreeRunning, DsoService::Idle, QList::isEmpty(), QString::isEmpty(), QCommandLineParser::isSet(), DeviceCommand::minCurrentRange(), minRangeFunc, DeviceCommand::minVoltageRange(), AbstractCommand::parseNumber(), AbstractCommand::processOptions(), rangeOptionValue, DsoService::RisingEdgeTrigger, settings, QString::startsWith(), QString::toLower(), QObject::tr(), QString::trimmed(), and QCommandLineParser::value().

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◆ requiredOptions()

QStringList DsoCommand::requiredOptions ( const QCommandLineParser & parser ) const

overridevirtual

Returns a list of CLI option names required by this command.

The main console appication may use this list to output an error (and exit) if any of the returned names are not found in the parsed CLI options.

The (already parsed) parser may be used adjust the returned required options depending on the value of other options. For example, the logger command only requires the --mode option if the --command option is start.

This base implementation simply returns an empty list. Derived classes should override this function to include any required options.

Reimplemented from AbstractCommand.

Definition at line 30 of file dsocommand.cpp.

{
    return DeviceCommand::requiredOptions(parser) + QStringList{
        u"mode"_s,
        u"range"_s,
    };
}

References AbstractCommand::requiredOptions().

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◆ serviceDetailsDiscovered

void DsoCommand::serviceDetailsDiscovered ( )

overrideprotectedslot

Handles service detail discovery events.

This override fetches the current device's status, and outputs it in the selected format.

Definition at line 187 of file dsocommand.cpp.

{
    DeviceCommand::serviceDetailsDiscovered(); // Just logs consistently.
    settings.range = (minRangeFunc == nullptr) ? 0 : minRangeFunc(*service->pokitProduct(), rangeOptionValue);
    const QString range = service->toString(settings.range, settings.mode);
    qCInfo(lc).noquote() << tr("Sampling %1, with range %2, %Ln sample/s over %L3us", nullptr, settings.numberOfSamples)
        .arg(DsoService::toString(settings.mode), (range.isNull()) ? QString::fromLatin1("N/A") : range)
        .arg(settings.samplingWindow);
    service->setSettings(settings);
}

References QString::arg(), QString::fromLatin1(), QString::isNull(), minRangeFunc, rangeOptionValue, service, DeviceCommand::serviceDetailsDiscovered(), settings, DsoService::toString(), and QObject::tr().

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◆ settingsWritten

void DsoCommand::settingsWritten ( )

privateslot

Invoked when the DSO settings have been written.

Definition at line 215 of file dsocommand.cpp.

{
    Q_ASSERT(service);
    qCDebug(lc).noquote() << tr("Settings written; DSO has started.");
    connect(service, &DsoService::metadataRead, this, &DsoCommand::metadataRead);
    connect(service, &DsoService::samplesRead, this, &DsoCommand::outputSamples);
    service->enableMetadataNotifications();
    service->enableReadingNotifications();
}

References QObject::connect(), metadataRead(), DsoService::metadataRead(), outputSamples(), DsoService::samplesRead(), service, and QObject::tr().

Referenced by getService().

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◆ supportedOptions()

QStringList DsoCommand::supportedOptions ( const QCommandLineParser & parser ) const

overridevirtual

Returns a list of CLI option names supported by this command.

The main console appication may use this list to output a warning for any parsed CLI options not included in the returned list.

The (already parsed) parser may be used adjust the returned supported options depending on the value of other options. For example, the logger command only supported the --timestamp option if the --command option is start.

This base implementation simply returns requiredOptions(). Derived classes should override this function to include optional options, such as:

QStringList Derived::supportedOptions(const QCommandLineParser &parser) const
{
    const QStringList list = AbstractCommand::supportedOptions(parser) + QStringList{ ... };
    list.sort();
    list.removeDuplicates(); // Optional, recommended.
    return list;
}

Reimplemented from AbstractCommand.

Definition at line 38 of file dsocommand.cpp.

{
    return DeviceCommand::supportedOptions(parser) + QStringList{
        u"interval"_s,
        u"samples"_s,
        u"trigger-level"_s,
        u"trigger-mode"_s,
    };
}

References AbstractCommand::supportedOptions().

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Member Data Documentation

◆ metadata

DsoService::Metadata DsoCommand::metadata

private

Most recent DSO metadata.

Definition at line 37 of file dsocommand.h.

Referenced by metadataRead(), and outputSamples().

◆ minRangeFunc

quint8(* DsoCommand::minRangeFunc) (const PokitProduct product, const quint32 maxValue)

inlineprivate

Pointer to function for converting rangeOptionValue to a Pokit device's range enumerator.

This function pointer is assigned during the command line parsing, but is not invoked until after the device's services are discovered, because prior to that discovery, we don't know which product (Meter vs Pro vs Clamp, etc) we're talking to and thus which enumerator list to be using.

If the current mode does not support ranges (eg diode, and continuity modes), then this member will be nullptr.