QKnxNetIpSessionRequestProxy Class

The QKnxNetIpSessionRequestProxy class provides the means to introspect session request data inside the generic QKnxNetIpFrame class and to create a KNXnet/IP session request frame from provided data. More...

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

This class was introduced in Qt 5.12.

Public Types

class Builder

Public Functions

QKnxNetIpSessionRequestProxy(const QKnxNetIpFrame &frame)
QKnxNetIpHpai controlEndpoint() const
bool isValid() const
QKnxByteArray publicKey() const

Static Public Members

QKnxNetIpSessionRequestProxy::Builder builder()

Detailed Description

This class is part of the Qt KNX module and currently available as a Technology Preview, and therefore the API and functionality provided by the class may be subject to change at any time without prior notice.

This frame will be sent by a KNXnet/IP secure client to the control endpoint of the KNXnet/IP secure server to initiate the secure session setup handshake for a new secure communication channel. The maximum time a KNXnet/IP secure client will wait for a response of the KNXnet/IP secure server is 10 seconds.

Note: When using QKnxNetIpSessionRequestProxy, 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 session request information:

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

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

auto endPoint = proxy.controlEndpoint();
auto publicKey = proxy.publicKey();

See also builder(), QKnxNetIpSessionResponseProxy, and Qt KNXnet/IP Connection Classes.

Member Function Documentation

QKnxNetIpSessionRequestProxy::QKnxNetIpSessionRequestProxy(const QKnxNetIpFrame &frame)

Constructs a proxy object to read the session request information carried by the specified KNXnet/IP frame frame.

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

Returns a builder object to create a KNXnet/IP session request frame.

QKnxNetIpHpai QKnxNetIpSessionRequestProxy::controlEndpoint() const

Returns the control endpoint from the generic KNXnet/IP session request frame.

bool QKnxNetIpSessionRequestProxy::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.

Note: KNXnet/IP session request frames currently have a fixed size of 46 bytes.

See also QKnxNetIpFrameHeader::totalSize().

QKnxByteArray QKnxNetIpSessionRequestProxy::publicKey() const

Returns the public key from the generic KNXnet/IP session request frame. The public key needs to be generated using the Curve25519 algorithm and has a fixed size of 32 bytes.

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