Victron Modbus TCP & MQTT Example
Confirmed working with pymodbus 3.6.3
These file's are based on a system that has victron equipment in an "ESS" system. Multiplus, Solar charger, BMV
Regarding the GX MQTT keepalive.
run the keep-alive on the cerbo (or Pi) its self.
The file's are provided above, named Keep-Alive.py and Forever.py
The Keep-Alive.py is run via a kind of pseudo monitoring script (forever.py).
Place both files in the cerbo /data directory and make sure they are set executable.
edit the /data/rc.local file (nano rc.local) and make an entry that looks like this
#!/bin/bash
sleep 30
/data/forever.py /data/keep-alive.py &
ctrl+o to write the file to disk and ctrl+x to exit
reboot the cerbo and the keep-alive should do its job.
the sleep command is to ensure the cerbo has had time to accomplish a full startup routine.
If you want to run the keep-alive in the script instead of the standalone keep-alive you will need the MQTT request in the update_value function with a counter or timer.
An example of the Victron TCP Modbus.
If you intend to use this example for yourself it will require tweaking a few things.
For starters you should download the victron xlsx register file from https://github.com/victronenergy/dbus_modbustcp/blob/master/CCGX-Modbus-TCP-register-list.xlsx
Check the tabs for the relevant information. Especially tab #2 Unit ID Mapping
Change the GX device IP address. Port is standard 502
Check Instance #'s from Cerbo GX and cross referenced to the unit ID in the Victron TCP-MODbus register xls file.
Change the the instance #'s to their correct values
You likely dont have the 3 temperature sensors included. Change the variable to turn them on and off.
PyQT5-Multiple-Chargers.py
PyQT5-Multiple-Chargers.ui
TK-VictronSolar.py
PyQT5-No-Multiplus-Single-Charger-JBD-BMS.py
This file is for a Raspi and a single Victron SmartSolar Charger. Also includes a Serial UART BMS (JBD in my case).
I have no idea if this works with the other compatiable BMS's. I only have a JBD.
Venus OS Serial BMS info
https://github.com/Louisvdw/dbus-serialbattery
USB Serial interface https://overkillsolar.com/product/usb-module-for-bms/
The connector included did not fit my BMS, YMMV. I cut the BMS BlueTooth cable in half and soldered the UART wire's to the connector wire's
To install
git clone https://github.com/optio50/Victron_Modbus_TCP
cd Victron_Modbus_TCP
chmod +x MODBUS_Example.py
chmod +x MQTT_Example.py
pip3 install paho-mqtt
pip install pymodbus
Change the VRMid and ip address, turn the analog sensors on or off in the script.
./MODBUS_Example.py
or
./MQTT_Example.py
To use the PyQt files you will need to.
pip install paho-mqtt
pip install pglive
install PyQT5 with your package manager.
such as sudo apt install python3-pyqt5
and sudo apt install python3-pyqt5.qtwebengine
The PyQT5-Multiple-Chargers.py and PyQT5-Multiple-Chargers.ui are PYQT5 files that are used together.
Same with PyQT5-Single-Charger.py and PyQT5-Single-Charger.ui
Just run the .py file and the .ui file will auto load.
execute in the cloned directory as the icon file is in that location.
Your system theme / font will dictate the style and appearence of the Pyqt program.
You must have the correct Victron equipment. such as Multiplus with ESS, BMV, Solar charger, Venus GX device.