What is this simulator best used for?

It is best for tracing message order and entity state transitions during realistic charging scenarios before release.

What should I configure before running a scenario?

Define relevant entities, expected sequence behavior, and at least one failure-path condition such as delayed updates or rejected authorization.

What results should I capture?

Capture message timeline evidence, payload-level details, and the first point where actual behavior diverges from expected behavior.

EV Roaming Tester

EV Charging Network Simulator

Interactive EV charging network simulator with real-time OCPI protocol visualization. Test EVSE states, monitor session lifecycles, and validate charging scenarios for CPO operations.

Interactive simulator loading

This is a shareable preview of EV Roaming Tester. The full interactive simulator runs in your browser with JavaScript enabled.

Use it to validate OCPI integrations, explore message flows, and reproduce roaming issues between CPO and eMSP systems without installing anything.

Key capabilities

Interactive network visualization for EV charging scenarios
Charging-session timeline with protocol message context
EVSE state changes and session lifecycle exploration
Hands-on debugging via logs and simulated events
Shareable scenarios for demos and reviews

Common workflows

Teams usually begin by defining one test objective and one expected outcome, then running a controlled scenario and inspecting sequence behavior. This makes triage faster and avoids noisy debugging sessions.

Validate OCPI endpoints by sending sample requests and inspecting responses for protocol correctness.
Reproduce a roaming issue by simulating a full session lifecycle and comparing message order and payloads.
Review message flows to align engineering and product teams on expected CPO ↔ eMSP interactions.
Capture logs and share a single URL to discuss a specific scenario with teammates.

Related resources

EV Roaming Tester for end-to-end interoperability workflows.
EV Charging Simulator for visual sequence analysis.
OCPI Testing Tool for structured protocol validation.
Learn OCPI for terminology and implementation guidance.