"Open" means opposite things either side of the relay. `serial/src/devices/ relay.ts` calls an energised relay *closed*, because its contact closes between COM and NO; the firmware calls that same state *open*, because the damper it drives is then out of the way. Both are right about their own subject and both appear in this repo, so a bare `is_open` is a coin flip for whoever reads it next. `is_bypass_open` says which of the two it means. The coil functions keep their `is_on`: they are about the coil, not the damper, and have no opinion on what the relay is wired to. Nothing changes on the wire or in Home Assistant. The only knock-on is formatting: the longer name pushes six spots past the line limit, and the rustfmt shape they take matches the multi-line patterns `topic()` already uses. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>