Read current point values from a Haystack server via the read op
domain: project-haystack.org · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Choose filter-based read (grid with filter + optional limit column, e.g. "point and siteRef==@siteA") or id-based read (grid of one or more id Ref rows)
POST the request grid to /haystack/read
For filter reads with no matches, expect an empty grid with zero rows, not an error
For id-based reads, match response rows positionally to the request; an id that isn't found returns a row of all-null cells
Remember curVal/curStatus reflect the last known value, not a forced refresh — use watchSub for that
Known gotchas
read never forces a downstream data refresh, even for proxied/gateway points
Id-read row order is preserved, but a not-found id produces a fully-null row rather than being omitted — don't infer failures from response length
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