Who should use EV Roaming Tester?

CPO, eMSP, QA, and reliability teams use it to validate roaming behavior before release and during partner onboarding.

What inputs are needed for useful roaming validation?

You should define OCPI version, entity assumptions, token state, expected timing behavior, and at least one negative-path scenario.

What outputs does the page provide?

It provides timeline visibility, scenario context, and evidence that helps triage protocol issues and communicate clearly with partners.

EV Roaming Tester

EV Roaming Protocol Testing Platform

Test EV roaming interoperability between CPO and eMSP systems. Supports OCPI 2.1.1 to 2.2.1. Validate message flows, simulate sessions, and ensure protocol compliance for B2B integrations.

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

End-to-end roaming simulation for OCPI integrations
Protocol troubleshooting with request/response inspection
Message-flow visualization for faster root-cause analysis
Session lifecycle walkthrough (tokens → sessions → CDRs)
Interoperability validation between CPO and eMSP systems

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.