Builder Class

Detailed Description

A KNXnet/IP tunneling request 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.

The common way to create a tunneling request is:

QKnxLinkLayerFrame linkFrame;
auto tunnelRequest = QKnxNetIpTunnelingRequestProxy::builder()
    .setCemi(linkFrame)
    .setChannelId(10)
    .setSequenceNumber(0)
    .create();

If the KNXnet/IP client does not receive a tunneling acknowledgment within the timeout of one second or the status of a received acknowledgment frame indicates that errors occurred, the client repeats the tunneling request frame once with the same sequence number and then terminates the connection by sending a disconnection request, QKnxNetIpDisconnectRequestProxy, to the server's control endpoint.