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feat(core): parse the Open OCPP Trace interchange format (#124)
* feat(core): parse the Open OCPP Trace interchange format Read the vendor-neutral Open OCPP Trace format (JSONL or a JSON array of records) into the internal event model. parseTrace() auto-detects it and delegates to parseOpenOcppTrace(); records map onto the OCPP-J frame with raw-frame precedence, messageId-based action derivation, and unknown-field tolerance, reusing the normalize pipeline and the shared untrusted-input limits (extracted to parseLimits.ts). deriveOpenOcppTraceView() reports the format's consumer view. The 15 specification conformance fixtures are vendored and asserted against it in CI, so DebugKit is a checked reference consumer of the format. * docs: record the Open OCPP Trace input adapter in CURRENT_STATE
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‎.changeset/open-ocpp-trace-input.md‎

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---
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'@ocpp-debugkit/toolkit': minor
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---
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Read the Open OCPP Trace interchange format. `parseTrace()` auto-detects it and `parseOpenOcppTrace()` parses it directly, mapping records onto the internal event model with raw-frame precedence, messageId-based action derivation, and unknown-field tolerance. `deriveOpenOcppTraceView()` exposes the format's consumer view, checked in CI against the specification's 15 conformance fixtures.

‎CURRENT_STATE.md‎

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## Active Milestone
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**v0.4.0 - Open OCPP Trace Interop (next)**
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**v0.4.0 - Open OCPP Trace Interop (in progress)**
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v0.3.1 is published to npm (16 detection rules, 15 scenarios, trace diffing,
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rich scenario assertions, and the ci/anonymize/diff CLI commands). Next up is
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interoperability with the Open OCPP Trace format: reading and writing the
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shared v1.1 interchange format so DebugKit exchanges traces with other OCPP
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tools, checked against the shared conformance fixtures.
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rich scenario assertions, and the ci/anonymize/diff CLI commands). The interop
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milestone reads and writes the shared Open OCPP Trace v1.1 interchange format,
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checked against the specification's conformance fixtures. The input half
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(#121) has landed; the exporter and `convert` CLI command (#122) remain.
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## What's Done
2020

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- ✅ `@ocpp-debugkit/toolkit@0.3.1` published to npm
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- ✅ Git tag `v0.3.1` + GitHub release `v0.3.1` created
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### Open OCPP Trace Input Adapter (PR #124)
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- ✅ `parseOpenOcppTrace()` reads the Open OCPP Trace v1.1 interchange format
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(JSONL or JSON array of records); `parseTrace()` auto-detects and delegates
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(Issue #121)
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- ✅ Raw-frame precedence, messageId-based action derivation, unknown-field
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tolerance; shared untrusted-input limits extracted to `parseLimits.ts`
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- ✅ `deriveOpenOcppTraceView()` exposes the format's consumer view
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- ✅ 15 specification conformance fixtures vendored and asserted in CI
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## What's Next
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1. **v0.4.0 - Open OCPP Trace Interop** - read and write the Open OCPP Trace
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v1.1 interchange format (#121, #122), checked against the shared fixtures
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1. **v0.4.0 - Open OCPP Trace Interop** - reading (#121) is done; remaining:
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the exporter and `convert` CLI command (#122), then the `v0.4.0` release
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2. **v0.5.0 - OCPP 2.0.1 Support** - extend the engine beyond 1.6J: message
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set, device model, scenarios, and detection
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3. **v1.0.0 - Stable FOSS Ecosystem** - API stabilization, 20+ scenarios, docs

‎README.md‎

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- **Replay Engine** — Deterministic, pure replay engine with step forward/back,
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jump-to-event, and configurable playback speed.
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- **Report Generation** — Export session analysis as Markdown or HTML reports.
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- **Open OCPP Trace Interop** - Read the vendor-neutral
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[Open OCPP Trace](https://github.com/open-ocpp-trace/specification) interchange
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format, so traces from other OCPP tools can be inspected and analyzed here.
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- **React Components** — Reusable, SSR-safe components for building custom
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inspector UIs (SessionTimeline, MessageInspector, FailureSummary,
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ReportViewer, ReplayControls).

‎docs/trace-format-spec.md‎

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---
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## Open OCPP Trace Format (interop)
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DebugKit also reads the
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[Open OCPP Trace format](https://github.com/open-ocpp-trace/specification), a
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vendor-neutral interchange format for OCPP traces. This lets traces produced by
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other tools (simulators, proxies, CSMS test suites) be inspected and analyzed
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here without hand-converting them.
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The format is a stream of records, one OCPP-J frame per record, as JSONL or a
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JSON array of records:
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```jsonl
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{"schemaVersion":"1.1","timestamp":"2024-01-15T10:30:00.000Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-001","direction":"cp-to-csms","messageType":"CALL","messageId":"msg-001","action":"BootNotification","payload":{"chargePointVendor":"SyntheticVendor","chargePointModel":"SM-100"},"raw":"[2,\"msg-001\",\"BootNotification\",{\"chargePointVendor\":\"SyntheticVendor\",\"chargePointModel\":\"SM-100\"}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T10:30:00.500Z","transport":"json","direction":"csms-to-cp","messageType":"CALLRESULT","messageId":"msg-001","payload":{"status":"Accepted"},"raw":"[3,\"msg-001\",{\"status\":\"Accepted\"}]"}
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```
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`parseTrace()` detects this format automatically; `parseOpenOcppTrace()` parses
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it directly. How records are consumed:
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- `direction` maps to the internal directions: `cp-to-csms` becomes
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`CS_TO_CSMS`, `csms-to-cp` becomes `CSMS_TO_CS`.
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- `raw`, when present, is the authoritative frame. If it disagrees with the
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decomposed fields, the frame from `raw` wins and a warning is recorded.
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- A response (`CALLRESULT` / `CALLERROR`) may omit `action`; its effective
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action is derived by correlating on `messageId`. `deriveOpenOcppTraceView()`
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reports that correlation as the format's consumer view.
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- Unknown fields are ignored, so a trace from a later minor version of the
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format still parses. The same size and event-count [limits](#limits) apply.
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The format is governed independently at
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[open-ocpp-trace/specification](https://github.com/open-ocpp-trace/specification),
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which ships a conformance suite that DebugKit's parser is checked against.
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---
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## OCPP 1.6 JSON Message Structure
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OCPP 1.6 JSON uses WebSocket text frames containing JSON arrays. There are

‎packages/toolkit/README.md‎

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- **Trace Parser** — Parse OCPP 1.6 JSON traces in JSON Object, JSONL, or bare
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array format. Safe parsing with size and event-count limits.
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- **Open OCPP Trace Interop** - Read the vendor-neutral
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[Open OCPP Trace](https://github.com/open-ocpp-trace/specification) format via
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`parseOpenOcppTrace()` (and `parseTrace()` auto-detection), checked against the
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specification's conformance fixtures.
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- **Failure Detection** — 16 detection rules (4 critical, 10 warning, 2 info)
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covering common failure patterns: failed authorization, connector faults,
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station offline, heartbeat timeout, meter value gaps, invalid stop reasons,
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- **CallResult:** `[3, "UniqueId", { ...payload }]`
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- **CallError:** `[4, "UniqueId", "ErrorCode", "ErrorDescription", {}]`
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`parseTrace()` additionally auto-detects the vendor-neutral
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[Open OCPP Trace](https://github.com/open-ocpp-trace/specification) interchange
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format (records carrying `messageType` and `direction`); parse it directly with
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`parseOpenOcppTrace()`.
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See the [trace format specification](https://github.com/ocpp-debugkit/toolkit/blob/main/docs/trace-format-spec.md) for full details.
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## Links

‎packages/toolkit/src/core/__fixtures__/open-ocpp-trace/README.md‎

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# Vendored Open OCPP Trace fixtures
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Conformance fixtures from the Open OCPP Trace specification, vendored here so
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DebugKit's parser is checked against them in CI.
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- **Source:** [open-ocpp-trace/specification](https://github.com/open-ocpp-trace/specification)
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(`fixtures/`). All data is synthetic.
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- Each `<name>/trace.jsonl` is a trace in the shared format. Each
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`<name>/expected.json` is the consumer view a conformant implementation
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derives from it: correlation pairs, effective actions, unanswered calls, and
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orphan responses.
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- [`../../openOcppTrace.conformance.test.ts`](../../openOcppTrace.conformance.test.ts)
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asserts that `deriveOpenOcppTraceView()` reproduces every `expected.json` and
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that `parseOpenOcppTrace()` parses every trace.
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Do not edit these by hand. Refresh them from the specification when it changes.

‎packages/toolkit/src/core/__fixtures__/open-ocpp-trace/connector-fault/expected.json‎

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{
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"schemaVersion": "1.1",
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"counts": {
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"records": 20,
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"calls": 10,
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"callResults": 10,
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"callErrors": 0
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},
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"records": [
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{
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"index": 0,
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"messageType": "CALL",
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"messageId": "msg-001",
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"action": "BootNotification"
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},
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{
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"index": 1,
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"messageType": "CALLRESULT",
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"messageId": "msg-001",
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"action": "BootNotification",
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"correlatesWith": 0
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},
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{
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"index": 2,
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"messageType": "CALL",
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"messageId": "msg-002",
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"action": "StatusNotification"
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},
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{
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"index": 3,
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"messageType": "CALLRESULT",
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"messageId": "msg-002",
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"action": "StatusNotification",
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"correlatesWith": 2
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},
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{
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"index": 4,
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"messageType": "CALL",
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"messageId": "msg-003",
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"action": "StatusNotification"
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},
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{
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"index": 5,
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"messageType": "CALLRESULT",
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"messageId": "msg-003",
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"action": "StatusNotification",
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"correlatesWith": 4
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},
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{
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"index": 6,
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"messageType": "CALL",
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"messageId": "msg-004",
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"action": "Authorize"
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},
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{
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"index": 7,
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"messageType": "CALLRESULT",
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"messageId": "msg-004",
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"action": "Authorize",
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"correlatesWith": 6
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},
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{
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"index": 8,
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"messageType": "CALL",
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"messageId": "msg-005",
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"action": "StartTransaction"
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},
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{
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"index": 9,
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"messageType": "CALLRESULT",
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"messageId": "msg-005",
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"action": "StartTransaction",
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"correlatesWith": 8
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},
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{
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"index": 10,
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"messageType": "CALL",
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"messageId": "msg-006",
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"action": "StatusNotification"
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},
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{
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"index": 11,
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"messageType": "CALLRESULT",
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"messageId": "msg-006",
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"action": "StatusNotification",
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"correlatesWith": 10
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},
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{
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"index": 12,
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"messageType": "CALL",
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"messageId": "msg-hb-1",
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"action": "Heartbeat"
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},
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{
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"index": 13,
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"messageType": "CALLRESULT",
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"messageId": "msg-hb-1",
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"action": "Heartbeat",
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"correlatesWith": 12
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},
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{
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"index": 14,
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"messageType": "CALL",
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"messageId": "msg-007",
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"action": "MeterValues"
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},
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{
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"index": 15,
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"messageType": "CALLRESULT",
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"messageId": "msg-007",
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"action": "MeterValues",
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"correlatesWith": 14
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},
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{
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"index": 16,
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"messageType": "CALL",
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"messageId": "msg-008",
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"action": "StatusNotification"
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},
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{
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"index": 17,
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"messageType": "CALLRESULT",
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"messageId": "msg-008",
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"action": "StatusNotification",
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"correlatesWith": 16
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},
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{
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"index": 18,
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"messageType": "CALL",
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"messageId": "msg-009",
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"action": "StopTransaction"
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},
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{
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"index": 19,
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"messageType": "CALLRESULT",
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"messageId": "msg-009",
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"action": "StopTransaction",
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"correlatesWith": 18
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}
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],
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"unansweredCalls": [],
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"orphanResponses": []
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}

‎packages/toolkit/src/core/__fixtures__/open-ocpp-trace/connector-fault/trace.jsonl‎

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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:00:00.000Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","direction":"cp-to-csms","messageType":"CALL","messageId":"msg-001","action":"BootNotification","payload":{"chargePointVendor":"SyntheticVendor","chargePointModel":"SM-100","chargePointSerialNumber":"CS-SYNTHETIC-003","firmwareVersion":"1.0.0"},"raw":"[2,\"msg-001\",\"BootNotification\",{\"chargePointVendor\":\"SyntheticVendor\",\"chargePointModel\":\"SM-100\",\"chargePointSerialNumber\":\"CS-SYNTHETIC-003\",\"firmwareVersion\":\"1.0.0\"}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:00:00.500Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","direction":"csms-to-cp","messageType":"CALLRESULT","messageId":"msg-001","payload":{"currentTime":"2024-01-15T12:00:00.500Z","interval":300,"status":"Accepted"},"raw":"[3,\"msg-001\",{\"currentTime\":\"2024-01-15T12:00:00.500Z\",\"interval\":300,\"status\":\"Accepted\"}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:01:00.000Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","connectorId":0,"direction":"cp-to-csms","messageType":"CALL","messageId":"msg-002","action":"StatusNotification","payload":{"connectorId":0,"status":"Available","errorCode":"NoError"},"raw":"[2,\"msg-002\",\"StatusNotification\",{\"connectorId\":0,\"status\":\"Available\",\"errorCode\":\"NoError\"}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:01:00.500Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","direction":"csms-to-cp","messageType":"CALLRESULT","messageId":"msg-002","payload":{},"raw":"[3,\"msg-002\",{}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:02:00.000Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","connectorId":1,"direction":"cp-to-csms","messageType":"CALL","messageId":"msg-003","action":"StatusNotification","payload":{"connectorId":1,"status":"Preparing","errorCode":"NoError"},"raw":"[2,\"msg-003\",\"StatusNotification\",{\"connectorId\":1,\"status\":\"Preparing\",\"errorCode\":\"NoError\"}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:02:00.500Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","direction":"csms-to-cp","messageType":"CALLRESULT","messageId":"msg-003","payload":{},"raw":"[3,\"msg-003\",{}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:02:15.000Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","direction":"cp-to-csms","messageType":"CALL","messageId":"msg-004","action":"Authorize","payload":{"idTag":"SYNTHETIC-TAG-002"},"raw":"[2,\"msg-004\",\"Authorize\",{\"idTag\":\"SYNTHETIC-TAG-002\"}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:02:15.500Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","direction":"csms-to-cp","messageType":"CALLRESULT","messageId":"msg-004","payload":{"idTagInfo":{"status":"Accepted","expiryDate":"2024-12-31T23:59:59.000Z"}},"raw":"[3,\"msg-004\",{\"idTagInfo\":{\"status\":\"Accepted\",\"expiryDate\":\"2024-12-31T23:59:59.000Z\"}}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:02:30.000Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","connectorId":1,"direction":"cp-to-csms","messageType":"CALL","messageId":"msg-005","action":"StartTransaction","payload":{"connectorId":1,"idTag":"SYNTHETIC-TAG-002","meterStart":0,"timestamp":"2024-01-15T12:02:30.000Z"},"raw":"[2,\"msg-005\",\"StartTransaction\",{\"connectorId\":1,\"idTag\":\"SYNTHETIC-TAG-002\",\"meterStart\":0,\"timestamp\":\"2024-01-15T12:02:30.000Z\"}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:02:30.500Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","direction":"csms-to-cp","messageType":"CALLRESULT","messageId":"msg-005","payload":{"transactionId":100002,"idTagInfo":{"status":"Accepted"}},"raw":"[3,\"msg-005\",{\"transactionId\":100002,\"idTagInfo\":{\"status\":\"Accepted\"}}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:02:31.000Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","connectorId":1,"direction":"cp-to-csms","messageType":"CALL","messageId":"msg-006","action":"StatusNotification","payload":{"connectorId":1,"status":"Charging","errorCode":"NoError"},"raw":"[2,\"msg-006\",\"StatusNotification\",{\"connectorId\":1,\"status\":\"Charging\",\"errorCode\":\"NoError\"}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:02:31.500Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","direction":"csms-to-cp","messageType":"CALLRESULT","messageId":"msg-006","payload":{},"raw":"[3,\"msg-006\",{}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:07:30.000Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","direction":"cp-to-csms","messageType":"CALL","messageId":"msg-hb-1","action":"Heartbeat","payload":{},"raw":"[2,\"msg-hb-1\",\"Heartbeat\",{}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:07:30.500Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","direction":"csms-to-cp","messageType":"CALLRESULT","messageId":"msg-hb-1","payload":{"currentTime":"2024-01-15T12:07:30.500Z"},"raw":"[3,\"msg-hb-1\",{\"currentTime\":\"2024-01-15T12:07:30.500Z\"}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:15:00.000Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","connectorId":1,"direction":"cp-to-csms","messageType":"CALL","messageId":"msg-007","action":"MeterValues","payload":{"connectorId":1,"transactionId":100002,"meterValue":[{"timestamp":"2024-01-15T12:15:00.000Z","sampledValue":[{"value":"3500","measurand":"Energy.Active.Import.Register","unit":"Wh"}]}]},"raw":"[2,\"msg-007\",\"MeterValues\",{\"connectorId\":1,\"transactionId\":100002,\"meterValue\":[{\"timestamp\":\"2024-01-15T12:15:00.000Z\",\"sampledValue\":[{\"value\":\"3500\",\"measurand\":\"Energy.Active.Import.Register\",\"unit\":\"Wh\"}]}]}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:15:00.500Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","direction":"csms-to-cp","messageType":"CALLRESULT","messageId":"msg-007","payload":{},"raw":"[3,\"msg-007\",{}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:18:00.000Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","connectorId":1,"direction":"cp-to-csms","messageType":"CALL","messageId":"msg-008","action":"StatusNotification","payload":{"connectorId":1,"status":"Faulted","errorCode":"ConnectorLockFailure","info":"Connector lock mechanism failure detected"},"raw":"[2,\"msg-008\",\"StatusNotification\",{\"connectorId\":1,\"status\":\"Faulted\",\"errorCode\":\"ConnectorLockFailure\",\"info\":\"Connector lock mechanism failure detected\"}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:18:00.500Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","direction":"csms-to-cp","messageType":"CALLRESULT","messageId":"msg-008","payload":{},"raw":"[3,\"msg-008\",{}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:18:05.000Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","direction":"cp-to-csms","messageType":"CALL","messageId":"msg-009","action":"StopTransaction","payload":{"transactionId":100002,"idTag":"SYNTHETIC-TAG-002","meterStop":3500,"timestamp":"2024-01-15T12:18:05.000Z","reason":"Other"},"raw":"[2,\"msg-009\",\"StopTransaction\",{\"transactionId\":100002,\"idTag\":\"SYNTHETIC-TAG-002\",\"meterStop\":3500,\"timestamp\":\"2024-01-15T12:18:05.000Z\",\"reason\":\"Other\"}]"}
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{"schemaVersion":"1.1","timestamp":"2024-01-15T12:18:05.500Z","ocppVersion":"1.6","transport":"json","chargePointId":"CS-SYNTHETIC-003","direction":"csms-to-cp","messageType":"CALLRESULT","messageId":"msg-009","payload":{"idTagInfo":{"status":"Accepted"}},"raw":"[3,\"msg-009\",{\"idTagInfo\":{\"status\":\"Accepted\"}}]"}

‎packages/toolkit/src/core/__fixtures__/open-ocpp-trace/diagnostics-failure/expected.json‎

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{
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"schemaVersion": "1.1",
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"counts": {
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"records": 8,
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"calls": 4,
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"callResults": 4,
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"callErrors": 0
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},
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"records": [
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{
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"index": 0,
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"messageType": "CALL",
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"messageId": "msg-001",
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"action": "BootNotification"
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},
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{
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"index": 1,
18+
"messageType": "CALLRESULT",
19+
"messageId": "msg-001",
20+
"action": "BootNotification",
21+
"correlatesWith": 0
22+
},
23+
{
24+
"index": 2,
25+
"messageType": "CALL",
26+
"messageId": "msg-002",
27+
"action": "StatusNotification"
28+
},
29+
{
30+
"index": 3,
31+
"messageType": "CALLRESULT",
32+
"messageId": "msg-002",
33+
"action": "StatusNotification",
34+
"correlatesWith": 2
35+
},
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{
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"index": 4,
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"messageType": "CALL",
39+
"messageId": "msg-hb-1",
40+
"action": "Heartbeat"
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},
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{
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"index": 5,
44+
"messageType": "CALLRESULT",
45+
"messageId": "msg-hb-1",
46+
"action": "Heartbeat",
47+
"correlatesWith": 4
48+
},
49+
{
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"index": 6,
51+
"messageType": "CALL",
52+
"messageId": "msg-003",
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"action": "DiagnosticsStatusNotification"
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},
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{
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"index": 7,
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"messageType": "CALLRESULT",
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"messageId": "msg-003",
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"action": "DiagnosticsStatusNotification",
60+
"correlatesWith": 6
61+
}
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],
63+
"unansweredCalls": [],
64+
"orphanResponses": []
65+
}

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