Trydan to MQTT Bridge

A Linux application that connects to Trydan EV chargers using the python3-pytrydan package and exposes data to an MQTT broker for integration with home automation systems.

Features

• Real-time Data Monitoring: Continuously monitors Trydan EV charger status, power consumption, energy delivered, and more
• MQTT Integration: Publishes data to MQTT broker with configurable topics
• Remote Control: Accept commands via MQTT to control charging (start/stop, set current, change mode)
• Generic MQTT Topics: Uses standard topic structure compatible with any MQTT-based system
• Robust Error Handling: Automatic reconnection and error recovery
• Systemd Service: Runs as a Linux daemon with automatic startup
• Configurable: Extensive configuration options via YAML files
• Secure: Support for MQTT TLS/SSL authentication

Prerequisites

• Linux system (Ubuntu, Debian, CentOS, RHEL, Fedora, Arch Linux)
• Python 3.7 or higher
• Trydan EV charger accessible via network
• MQTT broker (Mosquitto or cloud service)

Quick Installation

1. Clone or download the repository:

   git clone https://github.com/your-username/trydan2mqtt.git
   cd trydan2mqtt

2. Run the installation script:

   sudo ./scripts/install.sh

3. Configure the application:

   sudo nano /etc/trydan2mqtt/config.yaml

4. Start the service:

   sudo systemctl start trydan2mqtt
   sudo systemctl status trydan2mqtt

Manual Installation

System Dependencies

Ubuntu/Debian:

sudo apt-get update
sudo apt-get install python3 python3-pip python3-venv python3-systemd

CentOS/RHEL/Fedora:

sudo dnf install python3 python3-pip python3-systemd
# or for older systems:
sudo yum install python3 python3-pip python3-systemd

Arch Linux:

sudo pacman -S python python-pip python-systemd

Python Dependencies

Install the Python packages:

pip3 install -r requirements.txt

If python3-pytrydan is available as a system package (recommended):

# Ubuntu/Debian
sudo apt-get install python3-pytrydan

# Or install via pip
pip3 install pytrydan

Application Setup

1. Create application user:

   sudo useradd --system --home-dir /opt/trydan2mqtt --create-home --shell /bin/false trydan2mqtt

2. Install application files:

   sudo cp -r src/ /opt/trydan2mqtt/
   sudo mkdir -p /etc/trydan2mqtt
   sudo cp config/config.yaml /etc/trydan2mqtt/
   sudo chown -R trydan2mqtt:trydan2mqtt /opt/trydan2mqtt /etc/trydan2mqtt

3. Install systemd service:

   sudo cp systemd/trydan2mqtt.service /etc/systemd/system/
   sudo systemctl daemon-reload
   sudo systemctl enable trydan2mqtt

Configuration

Edit the configuration file at /etc/trydan2mqtt/config.yaml:

# Trydan EV Charger Configuration
trydan:
  host: "192.168.1.100"    # Your Trydan IP address
  device_id: "74D9TI"      # Unique device identifier for MQTT topics

# MQTT Broker Configuration
mqtt:
  host: "192.168.1.50"     # Your MQTT broker IP
  port: 1883               # MQTT port (1883 standard, 8883 SSL)
  client_id: "trydan"
  topic_prefix: "trydan2mqtt"
  username: "mqtt_user"    # Optional
  password: "mqtt_pass"    # Optional

# Bridge Configuration
bridge:
  poll_interval: 30        # Data collection interval in seconds

Usage

Starting the Service

# Start the service
sudo systemctl start trydan2mqtt

# Check status
sudo systemctl status trydan2mqtt

# View logs
sudo journalctl -u trydan2mqtt -f

# Stop the service
sudo systemctl stop trydan2mqtt

Manual Execution

For testing or debugging:

# Run with default config
python3 /opt/trydan2mqtt/src/trydan2mqtt.py

# Run with custom config
python3 /opt/trydan2mqtt/src/trydan2mqtt.py /path/to/custom/config.yaml

MQTT Topics

The application publishes data to the following MQTT topics:

Status Topics

• trydan2mqtt/{device_id}/sensor/status - Charging status (charge_state)
• trydan2mqtt/{device_id}/sensor/charging_current - Current charging current in Amperes (intensity)
• trydan2mqtt/{device_id}/sensor/charging_power - Current charging power in Watts (charge_power)
• trydan2mqtt/{device_id}/sensor/energy_delivered - Total energy delivered in kWh (charge_energy)
• trydan2mqtt/{device_id}/sensor/charge_time - Current charging session time
• trydan2mqtt/{device_id}/sensor/voltage - Installation voltage (voltage_installation)
• trydan2mqtt/{device_id}/sensor/house_power - House power consumption
• trydan2mqtt/{device_id}/sensor/battery_power - Battery power (if applicable)
• trydan2mqtt/{device_id}/sensor/fv_power - PV/Solar power generation
• trydan2mqtt/{device_id}/sensor/max_intensity - Maximum allowed charging current
• trydan2mqtt/{device_id}/sensor/min_intensity - Minimum allowed charging current
• trydan2mqtt/{device_id}/sensor/ready_state - Device ready state
• trydan2mqtt/{device_id}/sensor/locked - Charger lock status (true/false)
• trydan2mqtt/{device_id}/sensor/paused - Charging pause status (true/false)
• trydan2mqtt/{device_id}/sensor/dynamic - Dynamic charging mode status
• trydan2mqtt/{device_id}/sensor/contracted_power - Contracted power limit
• trydan2mqtt/{device_id}/sensor/firmware_version - Device firmware version
• trydan2mqtt/{device_id}/sensor/device_id - Unique device identifier
• trydan2mqtt/{device_id}/sensor/ip_address - Device IP address
• trydan2mqtt/{device_id}/sensor/signal_status - Communication signal status
• trydan2mqtt/{device_id}/data - Complete data as JSON with timestamp
• trydan2mqtt/{device_id}/availability - Device availability (online/offline)

Command Topics

Send commands to control the charger using JSON payloads (replace {device_id} with your configured device ID):

• trydan2mqtt/{device_id}/set - Send control commands with JSON payload

Available JSON commands:

• {"charge_current": 16} - Set charging current (amperage value)
• {"paused": "true"} - Control pause state ("true"/"pause" to pause, "false"/"resume" to resume)
• {"locked": "true"} - Control lock state ("true"/"lock" to lock, "false"/"unlock" to unlock)

Example Commands

Resume charging (replace 74D9TI with your device ID):

mosquitto_pub -h localhost -t "trydan2mqtt/74D9TI/set" -m '{"paused": "false"}'

Set charging current to 16A:

mosquitto_pub -h localhost -t "trydan2mqtt/74D9TI/set" -m '{"charge_current": 16}'

Pause charging:

mosquitto_pub -h localhost -t "trydan2mqtt/74D9TI/set" -m '{"paused": "true"}'

Lock charger:

mosquitto_pub -h localhost -t "trydan2mqtt/74D9TI/set" -m '{"locked": "true"}'

Unlock charger:

mosquitto_pub -h localhost -t "trydan2mqtt/74D9TI/set" -m '{"locked": "false"}'

Lock charger:

mosquitto_pub -h localhost -t "trydan/command/lock" -m ""

Troubleshooting

Common Issues

1. Cannot connect to Trydan device:

   • Check IP address in configuration
   • Verify network connectivity: ping <trydan_ip>
   • Ensure Modbus TCP is enabled on Trydan
   • Check firewall settings

2. Cannot connect to MQTT broker:

   • Verify MQTT broker is running
   • Check credentials and connection settings
   • Test with mosquitto client tools

3. Service won't start:

   • Check logs: sudo journalctl -u trydan2mqtt -f
   • Verify configuration file syntax
   • Check file permissions

4. No data being published:

   • Check Trydan connection status in logs
   • Verify MQTT topic configuration
   • Test with MQTT client: mosquitto_sub -h <broker> -t "trydan2mqtt/#"

Logs

View application logs:

# Service logs
sudo journalctl -u trydan2mqtt -f

# Application log file
sudo tail -f /var/log/trydan2mqtt.log

Testing Connectivity

Test Trydan connection:

# Python test script
python3 -c "
import asyncio
from pytrydan import Trydan

async def test():
    trydan = Trydan('192.168.1.100')
    await trydan.connect()
    status = await trydan.get_status()
    print(f'Status: {status}')
    await trydan.disconnect()

asyncio.run(test())
"

Test MQTT connection:

# Subscribe to all topics
mosquitto_sub -h <mqtt_broker> -t "trydan2mqtt/#"

# Publish test message
mosquitto_pub -h <mqtt_broker> -t "test/topic" -m "Hello MQTT"

Security Considerations

• Network Security: Ensure Trydan device is on a secure network
• MQTT Security: Use TLS/SSL for MQTT connections when possible
• Authentication: Configure MQTT username/password authentication
• Firewall: Restrict access to necessary ports only
• Updates: Keep the application and dependencies updated

Enabling MQTT TLS

Update configuration for secure MQTT:

mqtt:
  host: "your-mqtt-broker.com"
  port: 8883
  tls:
    enabled: true
    ca_certs: "/etc/ssl/certs/ca-certificates.crt"

Development

Project Structure

trydan2mqtt/
├── src/
│   └── trydan2mqtt.py          # Main application
├── config/
│   └── config.yaml             # Default configuration
├── systemd/
│   └── trydan2mqtt.service     # Systemd service file
├── scripts/
│   └── install.sh              # Installation script
├── requirements.txt            # Python dependencies
└── README.md                   # This file

Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Test thoroughly
5. Submit a pull request

Testing

Run basic tests:

# Install development dependencies
pip3 install pytest pytest-asyncio

# Run tests (if available)
pytest tests/

Uninstallation

To remove the application:

sudo ./scripts/install.sh uninstall

Or manually:

sudo systemctl stop trydan2mqtt
sudo systemctl disable trydan2mqtt
sudo rm /etc/systemd/system/trydan2mqtt.service
sudo rm -rf /opt/trydan2mqtt
sudo rm -rf /etc/trydan2mqtt
sudo userdel trydan2mqtt
sudo systemctl daemon-reload

License

This project is licensed under the MIT License - see the LICENSE file for details.

Support

• GitHub Issues: Report bugs and request features
• Documentation: Check this README and configuration files
• Community: Join discussions in the repository

Acknowledgments

• pytrydan - Python library for Trydan EV chargers
• paho-mqtt - MQTT client library