QKnxNetIpTunnelingRequestProxy Class

The QKnxNetIpTunnelingRequestProxy class provides the means to read a tunneling request from the generic QKnxNetIpFrame class and to create a KNXnet/IP frame based on the information. 更多...

头：	#include <QKnxNetIpTunnelingRequestProxy>
qmake:	QT += knx

所有成员列表，包括继承成员

公共类型

class

Builder

公共函数

	QKnxNetIpTunnelingRequestProxy (const QKnxNetIpFrame & frame )
QKnxLinkLayerFrame	cemi () const
quint8	channelId () const
bool	isValid () const
quint8	sequenceNumber () const

静态公共成员

QKnxNetIpTunnelingRequestProxy::Builder

builder ()

详细描述

Tunneling means that Engineering Tool Software (ETS) sends a single KNX frame in an KNXnet/IP frame and waits until the response arrives or a time-out is reached.

A tunneling request is sent by a KNXnet/IP client to establish a data connection to the endpoint of a KNXnet/IP server for sending a KNX frame. A tunneling request frame contains the ID of the communication channel between a KNXnet/IP client and server, the sequence number of the frame, and the KNX frame in the common external message interface (cEMI) format.

The KNXnet/IP server discards frames with sequence numbers that are not the expected sequence numbers or one less the expected sequence numbers and does not send a tunneling acknowledgment upon receiving them.

In most programs, this class will not be used directly. Instead, the QKnxNetIpTunnel or QKnxNetIpDeviceManagement class is used to establish a functional connection to a KNXnet/IP server.

Before sending a tunneling request, the KNXnet/IP client should use QKnxNetIpServerDescriptionAgent and QKnxNetIpServerInfo to check that the server supports the requested connection type and options.

注意： When using QKnxNetIpTunnelingRequestProxy, 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 request information sent by a KNXnet/IP client:

auto netIpFrame = QKnxNetIpFrame::fromBytes(...);
const QKnxNetIpTunnelingRequestProxy proxy(netIpFrame);
if (!proxy.isValid())
    return;
auto chanId = proxy.channelId();
auto seqNum = proxy.sequenceNumber();
auto knxLinkFrame = proxy.cemi();

另请参阅 builder (), QKnxNetIpTunnelingAcknowledgeProxy , Qt KNX Tunneling Classes ，和 Qt KNXnet/IP Connection Classes .

成员函数文档编制

QKnxNetIpTunnelingRequestProxy:: QKnxNetIpTunnelingRequestProxy (const QKnxNetIpFrame & frame )

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

`[static]` QKnxNetIpTunnelingRequestProxy::Builder QKnxNetIpTunnelingRequestProxy:: builder ()

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

QKnxLinkLayerFrame QKnxNetIpTunnelingRequestProxy:: cemi () const

Returns the KNX frame in the cEMI format.

quint8 QKnxNetIpTunnelingRequestProxy:: channelId () const

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

bool QKnxNetIpTunnelingRequestProxy:: isValid () const

返回 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.

另请参阅 QKnxNetIpFrameHeader::totalSize ().

quint8 QKnxNetIpTunnelingRequestProxy:: sequenceNumber () const

Returns the sequence number of a tunneling request frame.