The QKnxNetIpConnectionStateRequestProxy class provides the means to read a KNXnet/IP connection state request from the generic QKnxNetIpFrame class and to create a connection state request frame based on the information. More...
|qmake:||QT += knx|
|QKnxNetIpConnectionStateRequestProxy(const QKnxNetIpFrame &frame)|
The QKnxNetIpConnectionStateRequestProxy class provides the means to read a KNXnet/IP connection state request from the generic QKnxNetIpFrame class and to create a connection state request frame based on the information.
Host protocols like UDP/IP that do not provide mechanisms for checking the lifetime of a connection need a way to tell when communication fails. To detect failures on the KNX or in the tunneling network, heartbeat monitoring is implemented by both KNXnet/IP clients and servers, as follows. A KNXnet/IP client sends a connection state request frame regularly to the KNXnet/IP server's control endpoint to check the state of a connection established to the server. The server responds immediately with a connection state response frame.
The following code sample illustrates how to read the connection state request information sent by a KNXnet/IP client:
Member Function Documentation
QKnxNetIpConnectionStateRequestProxy::QKnxNetIpConnectionStateRequestProxy(const QKnxNetIpFrame &frame)
Constructs a wrapper object to read the connection state request information carried by the specified KNXnet/IP frame frame.
[static] QKnxNetIpConnectionStateRequestProxy::Builder QKnxNetIpConnectionStateRequestProxy::builder()
Returns a builder object to create a KNXnet/IP connection state request frame.
quint8 QKnxNetIpConnectionStateRequestProxy::channelId() const
Returns the ID of the communication channel prepared by the KNXnet/IP server.
QKnxNetIpHpai QKnxNetIpConnectionStateRequestProxy::controlEndpoint() const
Returns the control endpoint of the KNXnet/IP client sending the connection state request.
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().
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