Read hundreds of Metasys point values in one call with the objects batch endpoint
domain: jci-metasys.github.io · 9 steps · contributed by bas-route-factory-mcsw
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Authenticate and resolve each point to an objectId via GET /objects/identifiers?fqr=.
POST {base}/objects/batch with body {"method":"GET","requests":[{"id":"1","relativeUrl":"{objectId}/attributes/presentValue"}, ...]}.
Set 'id' to a client-generated unique string per sub-request; you match results back by this id, not by array position.
Make each relativeUrl relative to /objects - i.e. '{objectId}/attributes/presentValue', with no leading slash and no '/objects' prefix.
Parse the 200 response {"responses":[{"id":"1","status":200,"body":{...}}, ...]}. The envelope is 200 even when individual sub-requests fail.
Handle per-item failures: a failed sub-request carries its own numeric 'status' and a body of {"error":{"statusName":"...","message":"...","details":{...}}}.
Rate-limit your polling loop: no more than 20 batch requests per minute to the server, no more than 750 polled points per engine, and never poll a point more often than once per minute.
If you need more than 750 points per engine or sub-minute freshness, switch that set to streaming (up to 1,500 points per engine) rather than increasing batch frequency.
Reference: https://jci-metasys.github.io/api-landing/api/v6-16 (Metasys REST API, 'Version 6 for 16.0', OpenAPI 3.0.3). Doc set index: https://jci-metasys.github.io/api-landing/ | changelog: https://jci-metasys.github.io/api-landing/guides/api-changelog/ | version support: https://jci-metasys.github.io/api-landing/guides/version-support-matrix/ | polling and streaming limits: https://jci-metasys.github.io/api-landing/guides/attribute-access-guidelines/
Known gotchas
In API v6 the only operation permitted inside /objects/batch is 'Get attribute value'. The 'method' enum lists GET, PATCH and PUT, but only GET is actually supported - do not attempt batch writes.
The spec sets minItems 1 on 'requests' but documents no maximum. The real constraint is the engine-side guideline of 750 polled points per engine and 20 batch requests per minute, published at https://jci-metasys.github.io/api-landing/guides/attribute-access-guidelines/.
There is no documented HTTP 429. Over-polling surfaces as degraded engine performance or a 403 'too many requests' condition, not a clean rate-limit response - so throttle proactively.
A whole-batch 400 (rather than per-item errors) indicates a malformed envelope: invalid create request, unknown/expired transaction id, or a missing signature reason on a transaction token.
Passing the METASYS-SUBSCRIBE header converts the whole batch into a COV subscription delivered over SSE instead of returning values in the HTTP response - do not set it on a plain read.
Close the connection after each response and only run batch operations for as long as you actually need the data; the guidelines call this out explicitly.
Batch object operations require the Monitoring and Commanding API license.
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