QKnxNetIpTunnelingFeatureSetProxy Class

The QKnxNetIpTunnelingFeatureSetProxy class provides the means to access the information carried by a generic tunneling feature-set service QKnxNetIpFrame frame and to create a KNXnet/IP frame based on the information. More...

Header: #include <QKnxNetIpTunnelingFeatureSetProxy>
qmake: QT += knx
Since: Qt 5.12

This class was introduced in Qt 5.12.

Public Types

class Builder

Public Functions

QKnxNetIpTunnelingFeatureSetProxy(const QKnxNetIpFrame &frame)
quint8 channelId() const
QKnx::InterfaceFeature featureIdentifier() const
QKnxByteArray featureValue() const
bool isValid() const
quint8 sequenceNumber() const

Static Public Members

QKnxNetIpTunnelingFeatureSetProxy::Builder builder()

Detailed Description

A tunneling feature-set service frame contains the ID of the communication channel between a KNXnet/IP client and server, the sequence number of the frame, the interface feature to set, and the feature value as a byte array.

The tunneling client initiates the tunneling feature-set service to set the value of an interface feature in a tunneling server. The tunneling server accepts the value and applies it immediately, unless specified differently.

This means that the server applies the value before sending the tunneling feature-response or before routing the next tunneling request on the bus.

Within 3 seconds of confirming the tunneling feature-set service, the tunneling server sends a tunneling feature-response frame. The frame contains the written value and a return code.

Note: When using QKnxNetIpTunnelingFeatureSetProxy, care must be taken to ensure that the referenced KNXnet/IP frame outlives the proxy on all code paths, lest the proxy ends up referencing deleted data.

The following code sample illustrates how to read the tunneling feature-set service information sent by a KNXnet/IP client:

auto netIpFrame = QKnxNetIpFrame::fromBytes(...);

const QKnxNetIpTunnelingFeatureSetProxy proxy(netIpFrame);
if (!proxy.isValid())

auto id = proxy.featureIdentifier();
auto value = proxy.featureValue();

See also builder(), QKnxNetIpTunnelingFeatureInfoProxy, QKnxNetIpTunnelingFeatureResponseProxy, Qt KNX Tunneling Classes, and Qt KNXnet/IP Connection Classes.

Member Function Documentation

QKnxNetIpTunnelingFeatureSetProxy::QKnxNetIpTunnelingFeatureSetProxy(const QKnxNetIpFrame &frame)

Constructs a proxy object to read the tunneling feature-set service information carried by the specified KNXnet/IP frame frame.

[static] QKnxNetIpTunnelingFeatureSetProxy::Builder QKnxNetIpTunnelingFeatureSetProxy::builder()

Returns a builder object to create a KNXnet/IP tunneling feature-set service frame.

quint8 QKnxNetIpTunnelingFeatureSetProxy::channelId() const

Returns the ID of the communication channel between a KNXnet/IP client and server.

QKnx::InterfaceFeature QKnxNetIpTunnelingFeatureSetProxy::featureIdentifier() const

Returns the tunneling interface feature identifier of a tunneling feature-set service frame.

QKnxByteArray QKnxNetIpTunnelingFeatureSetProxy::featureValue() const

Returns the tunneling interface feature value of a tunneling feature-set service frame.

bool QKnxNetIpTunnelingFeatureSetProxy::isValid() const

Returns true if the frame contains initialized values and is in itself valid, otherwise returns false. A valid KNXnet/IP frame consists of at least a valid header and a size in bytes corresponding to the total size of the KNXnet/IP frame header.

See also QKnxNetIpFrameHeader::totalSize().

quint8 QKnxNetIpTunnelingFeatureSetProxy::sequenceNumber() const

Returns the sequence number of a tunneling feature-set service frame.

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