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OK, well that was interesting. The command actually worked. That code opened the door and looking at

curl --globoff "http://razberry:8083/ZWaveAPI/Run/devic ... rCode.data" I can see an entry for a user 10.

Get() / Set() commands always return null, because they're just queuing command for device. It may take some time till device wakes up and command is actually delivered, so there's no reason for them to return anything. When there's a reply from device, it will update corresponding value in the device subtree.

Null means command queued. The read UserCode.data.xxx. See log