[WIP] Provide callback for AccessLevel attribute #4138
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In some situations the write access to a variable node is not possible, e.g. the backend is not connected or device/machine is in a state where change of a certain variable is not possible. For such use cases a callback could be provided, which calculates the accessLevel.
For me the user access level attribute should consider only the user/role permissions attached to the session.
Todos:
add tests
same callback should be possible for the executable flag for methods -> executable flag is a booleanMove accessLevel and Callback in an union type -> doesn't really make sense, if callback is there, invoke it