Json object return type about ccu-jack

[mdzio]

The MQTT server can already store arbitrary JSON objects in arbitrary topics. For this, the retain flag of the message must be set. The payload must be structured as follows: {"v":{ any valid JSON object }}
However, the messages with retain flag are currently not yet persisted between restarts.

Another idea is to use a CCU system variable of type string to store and retrieve a stringified JSON object.

[Plurax]

MQTT retain would require to set it up once on startup. Thus I would have the necessity of a startup routine which holds the configuration. I want to keep the ui config (and ideally the broker IP, too) out of the react app.

I would appreciate the "string" variable path. For this I dont need the mqtt access, as the config might be big (currently I fetch it on load initially and create a device tree context with paths similar to the mqtt topics. So the value updates are done on mqtt websocket receive.
With this I would be able to configure the ui in the CCU3 without other dependencies and keep config code out of the project.

[mdzio]

This is already all possible as follows:

When loading the application, the configuration can be read out from a specific system variable via HTTP-GET, e.g. on the address /sysvar/1234/~pv. For this purpose, the ID of the system variable must be known. The ID can be determined via an HTTP GET on address /sysvar (system variable name must match property title).

If the web application is provided by the CCU-Jack itself, the host name does not have to be configured. The web application can be copied into the subdirectory webui.

[Plurax]

Thanks for clarification (and the web app path tip). For the record: Placing JSON in a string variable can cause code (JS) injection if someone is able to set the variable. Sparetime is rare but it works currently this way...