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C++ implementation of the Open Charge Point Protocol

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C++ implementation of OCPP

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This is a C++ library implementation of OCPP for version 1.6 and 2.0.1 (see OCPP protocols at OCA website).

It enables charging stations to communicate with cloud backends for remote control, monitoring and billing of charging processes.

Libocpp can be used for the communication of one charging station and multiple EVSE using a single websocket connection.

Libocpp provides a complete implementation of OCPP 1.6. The implementation of OCPP 2.0.1 is currently under development.

Get Involved

See the COMMUNITY.md and CONTRIBUTING.md of the EVerest project to get involved.

Table of contents

OCPP 1.6 Support

The following tables show the current support for the listed OCPP 1.6 feature profiles / functional blocks and application notes.

All documentation and the issue tracking can be found in our main repository here: https://github.com/EVerest/

Feature Profile Support OCPP 1.6

Feature Profile Supported
Core ✔️ yes
Firmware Management ✔️ yes
Local Auth List Management ✔️ yes
Reservation ✔️ yes
Smart Charging ✔️ yes
Remote Trigger ✔️ yes
Whitepapers & Application Notes Supported
OCPP 1.6 Security Whitepaper (3rd edition) ✔️ yes
Using ISO 15118 Plug & Charge with OCPP 1.6 ✔️ yes
OCPP & California Pricing Requirements ✔️ yes

Support for OCPP 2.0.1

The development of OCPP2.0.1 is in progress. Current implementation status.

Feature Profile Support OCPP 2.0.1

Feature Profile Supported
Core ✔️ yes
Advanced Security WIP
Local Auth List Management
Smart Charging WIP
Advanced Device Management
Advanced User Interface
Reservation
ISO 15118 support WIP
Whitepapers & Application Notes Supported
OCPP & California Pricing Requirements WIP

CSMS Compatibility

CSMS Compatibility OCPP 1.6

The EVerest implementation of OCPP 1.6 has been tested against the OCPP Compliance Test Tool (OCTT and OCTT2) during the implementation.

The following table shows CSMS with which this library was tested. If you provide a CSMS that is not yet listed here, feel free to contact us!

  • chargecloud
  • chargeIQ
  • Chargetic
  • Compleo
  • Current
  • Daimler Truck
  • ev.energy
  • eDRV
  • Fastned
  • Open Charging Cloud (GraphDefined)
  • Electrip Global
  • EnergyStacks
  • EV-Meter
  • Fraunhofer IAO (ubstack CHARGE)
  • Green Motion
  • gridundco
  • ihomer (Infuse CPMS)
  • iLumen
  • JibeCompany (CharlieV CMS and Chargebroker proxy)
  • MSI
  • PUMP (PUMP Connect)
  • Scoptvision (Scopt Powerconnect)
  • Siemens
  • SteVe
  • Syntech
  • Trialog
  • ubitricity
  • Weev Energy

CSMS Compatibility OCPP 2.0.1

The current, ongoing implementation of OCPP 2.0.1 has been tested against a few CSMS and is continuously tested against OCTT2.

Additionally, the implementation has been tested against those CSMS:

Integration with EVerest

This library is automatically integrated as the OCPP and OCPP201 module within everest-core - the complete software stack for your charging station. It is recommended to use EVerest together with this OCPP implementation.

Run OCPP1.6 with EVerest

If you run libocpp with OCPP1.6 with EVerest, the build process of everest-core will take care of installing all necessary dependencies for you.

Run OCPP2.0.1 with EVerest

If you run libocpp with OCPP1.6 with EVerest, the build process of everest-core will take care of installing all necessary dependencies for you. This includes the initialization of the device model database using the component config files.

Integrate this library with your Charging Station Implementation for OCPP1.6

OCPP is a protocol that affects, controls and monitors many areas of a charging station's operation.

If you want to integrate this library with your charging station implementation, you have to register a couple of callbacks and integrate event handlers. This is necessary for the library to interact with your charging station according to the requirements of OCPP.

Libocpp needs registered callbacks in order to execute control commands defined within OCPP (e.g Reset.req or RemoteStartTransaction.req)

The implementation must call event handlers of libocpp so that the library can track the state of the charging station and trigger OCPP messages accordingly (e.g. MeterValues.req , StatusNotification.req)

Your reference within libocpp to interact is a single instance to the class ChargePoint for OCPP 1.6 or to the class ChargePoint for OCPP 2.0.1.

Overview of the required callbacks and events and what libocpp expects to happen

The following section will give you a high level overview of how to integrate libocpp with your application. Please use the Doxygen Documentation as an additional source for the ChargePoint API.

In EVerest the OCPP module leverages several other modules to perform tasks that relate to authorization, reservations, charging session handling and system tasks like rebooting or firmware updates.

  • Auth orchestrates authorization, utilizing different token providers like RFID reads and token validators. Libocpp mainly acts as a token validator, but in the case of RemoteStartTransactions it acts as a token provider as well
  • EvseManager manages the charging session and charging state machine by communicating with a "board support package", a driver for the charging hardware that abstracts away the control pilot, relay control, power meters, etc. The EvseManager also handles reservations.
  • System handles firmware updates, log uploads and resets

The following sections explain the steps you can follow to implement their functionality on your own and integrate the libocpp directly into your charging station software without relying on EVerest. However, in most cases it's much easier to write an EVerest driver using the everest-core/interfaces/board_support_AC.yaml interface.

ChargePoint() constructor

The main entrypoint for libocpp for OCPP1.6 is the ocpp::v16::ChargePoint constructor. This is defined in libocpp/include/ocpp/v16/charge_point.hpp and takes the following parameters:

  • config: a std::string that contains the libocpp 1.6 config. There are example configs that work with a SteVe installation running in Docker, for example: config-docker.json

  • share_path: a std::filesystem path containing the path to the OCPP modules folder, for example pointing to /usr/share/everest/modules/OCPP. This path contains the following files and directories and is installed by the libocpp install target:

    .
├── config-docker.json
├── config-docker-tls.json
├── config.json
├── init.sql
├── logging.ini
└── profile_schemas
    ├── Config.json
    ├── Core.json
    ├── FirmwareManagement.json
    ├── Internal.json
    ├── LocalAuthListManagement.json
    ├── PnC.json
    ├── Reservation.json
    ├── Security.json
    ├── SmartCharging.json
    └── Custom.json

    Here you can find:

    • the aforementioned config files

    • a logging.ini that is needed to initialize logging with Everest::Logging::init(path_to_logging_ini, "name_of_binary")

    • a init.sql file which contains the database schema used by libocpp for its sqlite database

    • and a profile_schemas directory. This contains json schema files that are used to validate the libocpp config. The schemas are split up according to the OCPP1.6 feature profiles like Core, FirmwareManagement and so on. Additionally there is a schema for "Internal" configuration options (for example the ChargePointId, or CentralSystemURI). A "PnC" schema for the ISO 15118 Plug & Charge with OCPP 1.6 Application note, a "Security" schema for the OCPP 1.6 Security Whitepaper (3rd edition) and an exemplary "Custom" schema are provided as well. The Custom.json could be modified to be able to add custom configuration keys. Finally there's a Config.json schema that ties everything together

  • user_config_path: this points to a "user config", which we call a configuration file that's merged with the config that's provided in the "config" parameter. Here you can add, remove and overwrite settings without modifying the config passed in the first parameter directly. This is also used by libocpp to persistently modify config entries that are changed by the CSMS that should persist across restarts.

  • database_path: this points to the location of the sqlite database that libocpp uses to keep track of connector availability, the authorization cache and auth list, charging profiles and transaction data

  • sql_init_path: this points to the aforementioned init.sql file which contains the database schema used by libocpp for its sqlite database

  • message_log_path: this points to the directory in which libocpp can put OCPP communication logfiles for debugging purposes. This behavior can be controlled by the "LogMessages" (set to true by default) and "LogMessagesFormat" (set to ["log", "html", "session_logging"] by default, "console" and "console_detailed" are also available) configuration keys in the "Internal" section of the config file. Please note that this is intended for debugging purposes only as it logs all communication, including authentication messages.

  • evse_security: this is a pointer to an implementation of the evse_security interface. This allows you to include your custom implementation of the security related operations according to this interface. If you set this value to nullptr, the internal implementation of the security related operations of libocpp will be used. In this case you need to specify the parameter security_configuration

  • security_configuration: this parameter should only be set in case the evse_security parameter is nullptr. It specifies the file paths that are required to set up the internal evse_security implementation. Note that you need to specify bundle files for the CA certificates and directories for the certificates and keys

    The directory layout expected is as follows

    .
├── ca
│   ├── csms
│   │   └── CSMS_ROOT_CA.pem
│   ├── cso
│   │   ├── CPO_CERT_CHAIN.pem
│   │   ├── CPO_SUB_CA1_LEAF.der
│   │   ├── CPO_SUB_CA1.pem
│   │   ├── CPO_SUB_CA2_LEAF.der
│   │   └── CPO_SUB_CA2.pem
│   ├── mf
│   │   └── MF_ROOT_CA.pem
│   ├── mo
│   │   ├── INTERMEDIATE_MO_CA_CERTS.pem
│   │   ├── MO_ROOT_CA.der
│   │   ├── MO_ROOT_CA.pem
│   │   ├── MO_SUB_CA1.der
│   │   ├── MO_SUB_CA1.pem
│   │   ├── MO_SUB_CA2.der
│   │   └── MO_SUB_CA2.pem
│   └── v2g
│       ├── V2G_ROOT_CA.der
│       └── V2G_ROOT_CA.pem
├── client
│   ├── csms
│   │   ├── CPO_CERT_CHAIN.pem
│   │   ├── CPO_SUB_CA1.key
│   │   ├── CPO_SUB_CA2.key
│   │   ├── SECC_LEAF.der
│   │   ├── SECC_LEAF.key
│   │   └── SECC_LEAF.pem
│   ├── cso
│   │   ├── CPO_CERT_CHAIN.pem
│   │   ├── CPO_SUB_CA1.key
│   │   ├── CPO_SUB_CA2.key
│   │   ├── SECC_LEAF.der
│   │   ├── SECC_LEAF.key
│   │   └── SECC_LEAF.pem
│   └── v2g
│       └── V2G_ROOT_CA.key

registering callbacks

You can (and in many cases MUST) register a number of callbacks so libocpp can interact with the charger. In EVerest most of this functionality is orchestrated by the "EvseManager" module, but you can also register your own callbacks interacting directly with your chargers software. Following is a list of callbacks that you must register and a few words about their purpose.

TODO: in a future version of libocpp the callbacks will be organised in a struct with optional members emphasizing the required and optional callbacks.

Some general notes: the "connector" parameter of some of the callbacks refers to the connector number as understood in the OCPP 1.6 specification, "0" means the whole charging station, the connectors with EVSEs used for charging cars start at "1".

  • register_pause_charging_callback

    this callback is used by libocpp to request pausing of charging, the "connector" parameter tells you which connector/EVSE has to pause charging

  • register_resume_charging_callback

    this callback is used by libocpp the request resuming of charging, the "connector" parameter tells you which connector/EVSE can resume charging

  • register_stop_transaction_callback

    in EVerest this calls the EvseManagers stop_transaction command which "Stops transactions and cancels charging externally, charging can only be resumed by replugging car. EVSE will also stop transaction automatically e.g. on disconnect, so this only needs to be called if the transaction should end before." this will then signal the following events:

    • ChargingFinished
    • TransactionFinished

  • register_unlock_connector_callback

    can be used by libocpp to force unlock a connector

  • register_reserve_now_callback

    libocpp can use this to reserve a connector, reservation handling is outsourced to a reservation manager in EVerest that implements the reservation interface (everest-core/interfaces/reservation.yaml)

  • register_upload_diagnostics_callback

    uses a function (in EVerest provided by the System module) to upload the requested diagnostics file

  • register_upload_logs_callback

    uses a function (in EVerest provided by the System module) to upload the requested log file

  • register_update_firmware_callback

    uses a function (in EVerest provided by the System module) to perform a firmware update

  • register_signed_update_firmware_callback

    uses a function (in EVerest provided by the System module) to perform a signed firmware update

  • register_provide_token_callback

    this callback is used in a remote start transaction to provide a token (prevalidated or not) to the authorization system

  • register_set_connection_timeout_callback

    used by libocpp to set the authorization or plug in connection timeout in the authorization system based on the "ConnectionTimeout" configuration key

  • register_disable_evse_callback

    used to disable the EVSE (ChangeAvailability.req)

  • register_enable_evse_callback

    used to enable the EVSE (ChangeAvailability.req)

  • register_cancel_reservation_callback

    used to cancel a reservation in the reservation manager (CancelReservation.req)

  • register_signal_set_charging_profiles_callback

    used to signal that new charging schedule(s) have been set, you can then use get_all_composite_charging_schedules(duration_s) to get the new valid charging schedules

  • register_is_reset_allowed_callback

    used to inquire (in EVerest from the System module) if a reset is allowed

  • register_reset_callback

    used to perform a reset of the requested type

  • register_connection_state_changed_callback

    used to inform about the connection state to the CSMS (connected = true, disconnected = false)

  • register_configuration_key_changed_callback used to react on a changed configuration key. This callback is called when the specified configuration key has been changed by the CSMS

Functions that need to be triggered from the outside after new information is availble (on_... functions in the charge point API)

  • on_log_status_notification(int32_t request_id, std::string log_status)

    can be used to notify libocpp of a log status notification

  • on_firmware_update_status_notification(int32_t request_id, std::string firmware_update_status)

    can be used to notify libocpp of a firmware update status notification

  • on_meter_values(int32_t connector, const Powermeter& powermeter)

    provides a Powermeter struct to libocpp (for sending meter values during charging sessions or periodically)

  • on_max_current_offered(int32_t connector, int32_t max_current)

    the maximum current offered to the EV on this connector (in ampere)

The following functions are triggered depending on different so called "Session Events" from the EvseManager

each of these functions will have a small note what the Session Event was and what it triggers in libocpp

  • on_enabled(int32_t connector)

    Notifies libocpp that the connector is functional and operational

  • on_disabled(int32_t connector)

    Notifies libocpp that the connector is disabled

  • on_transaction_started

    Notifies libocpp that a transaction at the given connector has started, this means that authorization is available and the car is plugged in.

    Some of its parameters:

    session_id is an internal session_id originating in the EvseManager to keep track of the transaction, this is NOT to be mistaken for the transactionId from the StartTransactionResponse in OCPP!

    id_token is the token with which the transaction was authenticated

    meter_start contains the meter value in Wh for the connector at start of the transaction

    timestamp at the start of the transaction

  • on_transaction_stopped

    Notifies libocpp that the transaction on the given connector with the given reason has been stopped.

    Some of its parameters:

    timestamp at the end of the transaction

    energy_wh_import contains the meter value in Wh for the connector at end of the transaction

  • on_suspend_charging_ev

    Notifies libocpp that the EV has paused charging

  • on_suspend_charging_evse

    Notifies libocpp that the EVSE has paused charging

  • on_resume_charging

    Notifies libocpp that charging has resumed

  • on_session_started

    this is mostly used for logging and changing the connector state

  • on_session_stopped

    this is mostly used for logging and changing the connector state

  • on_error

    Notify libocpp of an error

  • on_reservation_start

    Notifies libocpp that a reservation has started

  • on_reservation_end

    Notifies libocpp that a reservation has ended

Authorization

In EVerest authorization is handled by the Auth module and various auth token providers and validators. The OCPP module acts as both a token provider (for pre validated tokens in RemoteStartTransactions) and a token validator (using the authorize requests, or plug & charge) To use libocpp as a auth token validator (e.g. before starting a transaction) you can call the "authorize_id_token" function of the ChargePoint object

Integrate this library with your Charging Station Implementation for OCPP2.0.1

TODO

Register event callbacks and on_handlers

Initialize the database

  • Use provided sql database or implement your own storage drive

Install libocpp

For Debian GNU/Linux 11 you will need the following dependencies:

  sudo apt install build-essential cmake python3-pip libboost-all-dev libsqlite3-dev libssl-dev

OpenSSL version 3.0 or above is required.

Clone this repository.

  git clone https://github.com/EVerest/libocpp

In the libocpp folder create a folder named build and cd into it. Execute cmake and then make install:

  mkdir build && cd build
  cmake ..
  make install

Quickstart for OCPP 1.6

Libocpp provides a small standalone OCPP1.6 client that you can control using command line.

Install the dependencies and libocpp as described in Install libocpp.

Make sure you modify the following config entries in the config.json file according to the CSMS you want to connect to before executing make install.

{
  "Internal": {
    "ChargePointId": "",
    "CentralSystemURI": ""
  }
}

Change into libocpp/build and execute cmake and then make install:

  cd build
  cmake -DLIBOCPP16_BUILD_EXAMPLES=ON -DCMAKE_INSTALL_PREFIX=./dist ..
  make -j$(nproc) install

Use the following command to start the charge point. Replace the config with config-docker.json if you want to test with the SteVe CSMS running in a docker container.

  ./dist/bin/charge_point \
    --maindir ./dist \
    --conf config.json

Type help to see a list of possible commands.

Building the doxygen documentation

  cmake -S . -B build
  cmake --build build --target doxygen-ocpp

You will find the generated doxygen documentation at: build/dist/docs/html/index.html

The main reference for the integration of libocpp for OCPP1.6 is the ocpp::v16::ChargePoint class defined in libocpp/include/ocpp/v16/charge_point.hpp .

Unit testing

GTest is required for building the test cases target. To build the target and run the tests you can reference the script .ci/build-kit/install_and_test.sh. The script allows the GitHub Actions runner to execute.

Local testing:

mkdir build
cmake -B build -DBUILD_TESTING=ON -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX="./dist"
cd build
make -j$(nproc) install

Run any required tests from build/tests.

Building with FetchContent instead of EDM

In doc/build-with-fetchcontent you can find an example how to build libocpp with FetchContent instead of EDM.

Support for TPM keys

In order to use the TPM keys, it is mandatory to use the default libwebsocket implementation.

Support for websocket++

The old websocket++ implementation has been deprecated. For enabling websocket++ support use the following cmake option:

  cmake .. -DLIBOCPP_ENABLE_DEPRECATED_WEBSOCKETPP=ON

Support for iface

In order to connect through a custom network iface, a custom internal config variable 'IFace' can be used.

"Internal": {        
    "IFace" : "enp43s0"
}

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C++ implementation of the Open Charge Point Protocol

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