ocpp

Type-safe OCPP (Open Charge Point Protocol) message models and OCPP-J codecs for Gleam, generated from the OCA JSON schemas with spec-derived documentation.

One package, every protocol version — each under its own namespace, so you import only the version(s) you speak:

Each version namespaces one module per spec entity, so the module is the namespace and no name carries a type prefix:

import ocpp/v2_0_1/enums/boot_reason
import ocpp/v2_0_1/messages/boot_notification

// Build a request from its required fields (optionals default to None):
let request =
  boot_notification.new_request(
    charging_station: station,
    reason: boot_reason.PowerUp,
  )

// Encode / decode the exact OCPP-J JSON (schema constraints enforced):
let wire = boot_notification.request_to_json(request)
json.parse(body, boot_notification.response_decoder())

Dispatch by action string (ocpp/v2_0_1/dispatch) maps a wire frame's action to the right decoder and back; the frame layer lives in ocpp/transport/json/frame.

Development

The per-version modules are generated — do not edit them by hand. The generator lives in dev/ (so it ships with neither the package nor its dependencies). To regenerate from the vendored schemas, from the repo root:

gleam dev                 # writes the staging tree under generated/
gleam format generated
for v in v1_6 v2_0_1 v2_1; do
  rsync -a --delete generated/ocpp/$v/ src/ocpp/$v/
done

Run the tests (codec round-trips and codegen suites together):

gleam test