Detailed Description

A KNXnet/IP client connects to a configuration and management data endpoint of a KNXnet/IP server to send device configuration request frames and to receive device configuration acknowledgment frames. A device configuration request is used to read and write KNXnet/IP device configuration data. When a server receives a configuration request, it responds with a device configuration acknowledgment to confirm the reception of the request.

A device configuration request frame contains the ID of the communication channel between a KNXnet/IP client and server, the sequence number of the frame, and a common external message interface (cEMI) frame with the configuration message.

The KNXnet/IP server discards frames with unexpected sequence numbers and does not send a device configuration 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 device configuration request is:

QKnxDeviceManagementFrame cemi = // build cEMI frame
auto netIpFrame = QKnxNetIpDeviceConfigurationRequestProxy::builder()
    .setChannelId(1)
    .setSequenceNumber(1)
    .setCemi(cemi)
    .create();

If the KNXnet/IP client does not receive a device configuration acknowledgment within the specified timeout or the status of a received acknowledgment frame indicates that errors occurred, the client repeats the request three times and then terminates the connection by sending a disconnection request, QKnxNetIpDisconnectRequestProxy, to the server’s control endpoint.