It is not possible to proxy the mxProxy connections through Apache.
It is possible to run the mxProxy on a separate/DMZ host.
It is possible to use a reverse proxy for the WinCC OA webserver (for example with ULC UX).

The smoothing can be disabled for the general query by setting the '_Driver<num>.SM' to 1 (always smooth except for the general query).

The other values can be found in the documentation under: Reference tables -> Internal data point types -> _DriverCommon (General driver)

I check if the result of 'getActiveHttpServerUrl()' is not empty to determine if running in a DesktopUI.

The "Insert Function Documentation" is NOT part of the "High Speed Programming", but built into the script editor. So unfortunately the inserted function header is fixed.

It looks like multidimensional arrays are not supported. I guess it would be not too difficult to convert a multidimensional array to a flat array.

Contact support to create a feature request for this.

To run something on the ULC UX client browser you could use the WebView EWO with the property 'ulcClientSideWidget' set. Inside this widget you could provide a download link or a JavaScript trend with download option. A JavaScript trend example can be found in the documentation under: Graphics edito...

Is it not an option to use 'Polling on Use' instead of (de)activating the variables?

Look in the documentation under: Drivers -> Driver specific functions -> Poll on use

Modbus does not work with strings, at most short character arrays. Because the Modbus message size is limited. The easiest solution would be to use MQTT and run a broker, like mosquitto . But if you want to implement and maintain your own protocol, it could also be done in control with tcpOpen/udpOp...

Retries before a SNMP protocol error is shown . The standard value is 1, maximum 10 retries can be configured. Drivers do not stop trying to communicate with devices. Retries refer to the number of retries before an error is reported. In my experience the 'Status.Timeout' element provides a better ...

You could better use the 'Timeout' element for monitoring if the device is responding. Because SNMP uses the UDP protocol, which is connectionless.