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ARServer Roadmap

ARServer is moving toward a complete native IEC 61850 gateway workflow for practical HMI, SCADA, Modbus TCP, and MQTT use.

Design direction

The product direction is simple:

IED / Relay → native IEC 61850 MMS client → runtime cache → Modbus TCP / MQTT

The HMI or SCADA system should not poll the relay directly for every screen refresh. ARServer acts as a gateway layer with selected signals, clear mapping, cached values, device timestamp, quality, and output diagnostics.

Implemented milestones

N1 — Native transport foundation

  • TCP port 102 connection.
  • TPKT frame handling.
  • COTP connection request/confirm.
  • Runtime status separated between transport and application association.

N2 — ACSE/MMS association

  • ISO session and presentation handshake.
  • ACSE association request.
  • MMS initiate request/response probe.
  • Diagnostics for association state.

N3/N4 — Confirmed-Read

  • Single-variable MMS Confirmed-Read.
  • IEC object to MMS domain/item mapping.
  • response invoke ID validation.
  • first-pass decoder for status, Boolean, integer, float, string, quality, and timestamp-like values.

N7 — Correct Presentation P-DATA envelope

  • Confirmed-Read wrapped in Presentation P-DATA.
  • Response unwrap before MMS decode.
  • Field-proven read path for CB position values.

N8 — Native IP discovery

  • Online MMS discovery by IP.
  • Domain browse.
  • domain variable browse.
  • MMS name to IEC object candidate mapping.
  • SCADA-friendly candidate recommendation.

N9 — Quality and timestamp sidecar

  • Companion q and t reads when available.
  • Runtime snapshot carries local timestamp and device timestamp separately.
  • MQTT payload includes value, quality, local timestamp, and device timestamp.

N10 — Probe before runtime commit

  • Wizard-level probe selected signal.
  • Probe validates value and attempts companion quality/timestamp reads.
  • Runtime grid arranged as IEC Object | Value | Timestamp | Quality | Type.

N11R — Report plan in Edit IED Wizard

  • RCB/DataSet inventory is shown in the Edit IED Wizard as a configuration step, not as a runtime tab.
  • IP discovery does not auto-probe RCB attributes, so polling discovery stays stable.
  • RCB attribute probe is explicit and read-only after user selection.
  • Runtime remains MMS polling until report activation is implemented.

Next milestones

N12 — DataSet directory engine

  • Read DataSet member directory for selected RCB/DataSet.
  • Show coverage between DataSet members and selected runtime signals.
  • Keep report activation disabled until receive loop and safe RCB enable sequence are implemented.

N13 — Discovery hardening

  • Better filtering for common LN classes.
  • Better handling of vendor-specific MMS names.
  • More deterministic type inference.
  • Discovery report export.

N14 — Multi-point read optimization

  • Group reads by relay and functional constraint.
  • Reduce request count for large mappings.
  • Maintain fast lane for CB/status/protection points.
  • Add timeout and retry profiles per IED.

N15 — Report verification

  • Online DataSet browse.
  • Online ReportControl browse.
  • Compare selected signals against DataSet members.
  • Show RCB ownership/readiness before activation.

N16 — Report activation with polling fallback

  • Enable report-preferred runtime mode.
  • Decode InformationReport values.
  • Preserve polling fallback for stale or failed reports.
  • Show report state in diagnostics.

N17 — Mapping/report documentation

  • Export Modbus register map.
  • Export selected IEC object list.
  • Export validation summary.
  • Create FAT-friendly evidence report.

Product principles

  • Read-only operation first.
  • Never invent field values.
  • Keep device timestamp separate from local PC timestamp.
  • Make Modbus and MQTT mapping explicit.
  • Prefer SCL when engineering files are available.
  • Use IP discovery for quick online setup.
  • Keep diagnostics useful for field troubleshooting.
  • Keep the repository Apache-2.0 and self-contained.