Builder Class

Detailed Description

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, QKnxNetIpConnectionStateResponseProxy.

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 connection state request is:

auto hpai = QKnxNetIpHpaiProxy::builder().create();

auto netIpFrame = QKnxNetIpConnectionStateRequestProxy::builder()
    .setChannelId(255)
    .setControlEndpoint(hpai)
    .create();

If the KNXnet/IP client does not receive the connection state response within a timeout, or the status of the received response indicates that errors occurred, the client repeats the connection state request three times. It then terminates the connection by sending a disconnect request, QKnxNetIpDisconnectRequestProxy, to the server's control endpoint.