mako-wim

WiM — Wechselprozesse im Messwesen Strom

Process engine workflows for the German electricity metering system change processes. Implements the BDEW WiM specification and the BNetzA ruling BK6-24-174 (Beschluss 24.10.2024, gültig seit 06.06.2025).

APERAK Frist

WiM processes use 5 Werktage (fristen::add_werktage(5, BdewMaKo)) for the APERAK response deadline. Saturday counts as a Werktag; Sunday and public holidays do not.

PID Inventory

Legend: ✅ Implemented — full state machine + AHB rule enforcement, production-safe. ⚠️ Registered — PID routes to the workflow; handle() returns WorkflowError::NotImplemented for unhandled commands (no silent data loss). ✗ Not registered — PID is not in the router; inbound messages are dead-lettered.

PIDs 11002–11099: All 99 PIDs are registered under wim-device-change. Only 11001 (Anmeldung nMSB) returns a real response; others return WorkflowError::NotImplemented and the message is APERAK-rejected without crashing the engine.

EDIFACT Format Versions

Modules

Usage

use mako_wim::{WimDeviceChangeWorkflow, DeviceChangeCommand};
use mako_engine::{builder::EngineBuilder, event_store::InMemoryEventStore};

// In tests (requires `testing` feature or `#[cfg(test)]`):
#[cfg(test)]
let ctx = EngineBuilder::new()
    .with_event_store(InMemoryEventStore::new())
    .build();

// In production, explicitly provide all stores:
// let ctx = EngineBuilder::with_stores(outbox, deadline, registry)
//     .with_event_store(my_slatedb_store)
//     .build();

let process = ctx.spawn::<WimDeviceChangeWorkflow>(tenant_id, workflow_id);
let events = process.execute(DeviceChangeCommand::ReceiveUtilmd {
    pid: 11001,
    // …
}).await?;

Regulatory references

• BDEW WiM Wechselprozesse im Messwesen Strom
• MsbG — Messstellenbetriebsgesetz
• BNetzA BK6-24-174 (Beschluss 24.10.2024, gültig seit 06.06.2025) — Frist 5 Werktage für APERAK
• EDI@Energy UTILMD Strom AHB S2.2 (FV2026-10-01)
• EDI@Energy APERAK AHB 2.2 (FV2026-10-01)