JuicepassProxy MQTT to OCPP Client

This project is an Proof of Concept client that connects to an Open Charge Point Protocol (OCPP) server and integrates with an MQTT broker to monitor charging parameters. This application listens to various MQTT topics for EV charging information (e.g., voltage, frequency, power, status) and sends these values to an OCPP server, as well as receiving configuration and status requests from the server. This application has ONLY BEEN TESTED WITH THE OCPP Home Assistant addon. It only monitors values and does not support control at this time.

Features

• OCPP 1.6 Support: Integrates with OCPP servers to send meter values and handle configuration requests.
• MQTT Integration: Subscribes to MQTT topics for real-time updates on EV charging parameters.
• Configurable Arguments: Customizable broker, server, and client settings via command-line arguments.
• Debug and Daemon Modes: Supports verbose debug logging and can run as a background daemon.

Installation

This project requires Python 3.7+ and the following libraries:

• paho-mqtt
• websockets
• ocpp
• python-daemon (for daemon mode)

To install dependencies:

pip install paho-mqtt websockets ocpp python-daemon

For many distributions, Python venv now needs to be used as pip installs a few libraries.

Home Assistant

This has only been tested with the OCPP HA Addon/Integration. If you want to test the same way, you install the OCPP Addon, and within the integration when you add a new instance set the Chargepoint ID to "juicepassproxy" . Unselect " Automatic detection of OCPP Measurands"
Max Charging Current to your value
Select "Skip OCPP schema validation"

On the next screen select the follwing options:

• Current.Import: Instantaneous current flow to EV
• Current.Offered: Maximum current offered to EV
• Energy.Active.Import.Register: Active energy imported from the grid
• Energy.Active.Import.Interval: Active energy imported from the grid during last interval
• Frequency: Powerline frequency
• Power.Active.Import: Instantaneous active power imported by EV
• Power.Factor: Instantaneous power factor of total energy flow
• Temperature: Temperature reading inside Charge Point
• Voltage: Instantaneous AC RMS supply voltage

Usage

The application can be executed from the command line with the following options:

Command-Line Arguments

Argument	Type	Description	Default Value
--mqtt_address	string	MQTT broker address or hostname.	127.0.0.1
--mqtt_port	int	Port for MQTT broker.	1883
--mqtt_user	string	Username for MQTT broker authentication (leave blank if no authentication is required).	""
--mqtt_pass	string	Password for MQTT broker authentication.	""
--ws_address	string	WebSocket IP address or hostname for the OCPP server.	0.0.0.0
--ws_port	int	Port for the WebSocket server.	9000
--chargepoint_id	string	Charge Point ID used to identify this EVSE to the OCPP server.	juicepassproxy
--debug	flag	Enable debug mode, providing verbose logging for development and troubleshooting.	False
--daemon	flag	Run the application in the background as a daemon. Requires python-daemon library.	False

Example Usage

python jpp_ocpp_client.py --debug

Run the application as a daemon:

python jpp_ocpp_client.py --daemon

Configuration

For quick configuration, you can pass arguments directly on the command line. Alternatively, modify the default values in the code if you prefer hardcoded values or require fixed settings.

MQTT Topics

This application listens to the following MQTT topics for EV charging data:

• Voltage: hmd/sensor/JuiceBox/Voltage/state
• Frequency: hmd/sensor/JuiceBox/Frequency/state
• Temperature: hmd/sensor/JuiceBox/Temperature/state
• Power Factor: hmd/sensor/JuiceBox/Power-Factor/state
• Current: hmd/sensor/JuiceBox/Current/state
• Power: hmd/sensor/JuiceBox/Power/state
• Current Offered: hmd/sensor/JuiceBox/Max-Current-Online-Device-/state
• Energy Active Import Register: hmd/sensor/JuiceBox/Energy--Session-/state
• Status: hmd/sensor/JuiceBox/Status/state (e.g., Charging, Available, etc.)

These values are sent to the OCPP server in real-time as part of the MeterValues or StatusNotification calls.

Debug Mode

Use the --debug flag to enable verbose debug logging. This mode will log each MQTT topic message, connections to the MQTT broker and OCPP server, and responses from the server.

Daemon Mode

Use the --daemon flag to run the application in the background as a system daemon. Daemon mode allows the application to continue running after logging out or closing the terminal. Note: The python-daemon library must be installed for this feature.

Info, TODO, and Bugs

Currently can only monitor several values that are in MQTT from JuicepassProxy.
For some reason, Charging Session Energy values do not popualte in HA, but are processesed by the application.
Maybe add ability to control.
Include in to JPP appliance builds to create a bridge to OCPP services.