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Package astarteapi implements the JSON envelope conventions shared by every Astarte-compatible REST surface: success bodies are wrapped as {"data": ...}, error bodies as {"errors": {"detail": "..."}} (or the field-keyed changeset shape used by 422 validation failures), and request bodies arrive wrapped as {"data": ...}.

Package deviceid implements Astarte's 128-bit device identifier and its canonical encodings: the 22-character unpadded base64url wire form used in MQTT topics, REST paths and certificate CNs, and the canonical UUID form used by operators and tooling.

Package interfaceschema parses, validates, and compiles Astarte interface definitions — the dynamic typed schemas (datastreams and properties) that devices and applications exchange data through.

Package payload implements the dual-format Astarte data-payload codec (docs/DESIGN.md §3.5): standard BSON `{v, t}` documents as produced by the official Astarte device SDKs, and the strict Astrate JSON profile (§3.5.3) for constrained clients (AtomVM and friends) on the same topics with the same semantics.