ocppsim

ocppsim is a terminal OCPP-J (Open Charge Point Protocol JSON) charge point simulator written in Rust. It connects to a CSMS over WebSocket, negotiates an OCPP subprotocol, and lets an operator drive common charge point workflows from an interactive terminal UI.

The simulator is focused on practical protocol development and CSMS testing. It keeps local connector, transaction, meter, reservation, charging profile, and configuration state, then emits protocol-shaped OCPP messages from that state.

Documentation

Documentation on design, protocol support, usage, and more is available in the docs directory.

Quick Start

Download prebuilt binaries for Linux, macOS, and Windows from ocppsim's latest GitHub release, or install it with Cargo:

cargo install ocppsim

Then, run directly against a CSMS endpoint:

ocppsim --ws-url ws://csms.example.com/ocpp --cp-id CP-001

Or use a named profile from a TOML config file in ~/.config/ocppsim/ocppsim.toml or a custom path:

ocppsim some-profile
ocppsim some-profile --config-path ./ocppsim.toml

Docker images are also available on Docker Hub as zhongruoyu/ocppsim, and on GitHub Container Registry as ghcr.io/zhongruoyu/ocppsim. Use the latest tag or a specific version tag like v0.1.0 to track stable releases, and main to track the latest commit on the main branch. You can run the simulator with a mounted config file like:

docker run --rm -it \
  -v "$PWD/ocppsim.toml:/config/ocppsim.toml:ro" \
  zhongruoyu/ocppsim some-profile --config-path /config/ocppsim.toml

Run ocppsim --help for more CLI options. Inside the terminal UI, type help to see available simulator commands. See documentation for more details on usage.

Protocol Scope

OCPP 1.6 base JSON schemas are the primary complete target. The OCPP 1.6 Security Whitepaper extension is intentionally out of scope for now and is reported as unsupported when recognized.

OCPP 2.0.1 and OCPP 2.1 support the feature subset that maps to already implemented OCPP 1.6 behavior, plus GetVariables and SetVariables for the configuration-equivalent device model surface. Other 2.x actions are explicitly treated as unsupported until they are implemented and tested.

Schema validation tests use files under schemas as the source of truth.

License

This project is licensed under the MIT License. See LICENSE for details.