Hy Murveit
Hy Murveit replied to the topic 'How does EKos know the current position of the focuser' in the forum. 1 week ago

Many (perhaps most?) focusers report their position to the INDI driver, which in turn sends it to Ekos.
So, Ekos gets told the focuser position.

Internally, the focuser firmware will very likely do as you said: "record where it last was and imagine that it's still there".
Hy

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