Hi Lukas,
I just installed your Data Layer provider (nodeprovider) and also installed the SDK sample sdk-py-webserver. I was able to write with the python webserver of the SDK to all the values your sample provides in the Data Layer (bool, double, int, string).
So your provider works totally fine and your problems come form your webserver sample. The webserver sample in the SDK also works fine. So I would recommend to compare these tow in detail and see where the differences are.
Best regards,
Nick
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