Integration / D Bus Interview Questions
What are D-Bus properties?
D-Bus properties are named, typed values exposed by an object, similar to fields or attributes on an object in a programming language, that can be read and sometimes written by remote callers.
Properties aren't accessed directly as their own message type; instead, they go through the standard org.freedesktop.DBus.Properties interface, which every object exposing properties is expected to implement. It provides Get to read a single property, Set to write one, and GetAll to fetch every property on a given interface at once, typically returning them as a dictionary of variants (a{sv}).
When a property changes, well-behaved services emit a PropertiesChanged signal on that same interface so subscribers don't have to keep polling Get to notice updates.
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