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I am reading ESS Mode2/3 can be controlled via Modbus. Anyone managed to do it via an API instead of Modbus? I can see VRM has the readonly data, but confirming that I can't set the values via VRM and a local device on the network needs to Modbus in the values over TCP?
I've only accessed these services via MQTT
I have not tried it but it should be able to control ESS via VRM MQTT.
Look at "Connecting to the Victron MQTT server"
https://github.com/victronenergy/dbus-mqtt
The dbus-mqtt service will then take your MQTT messages and put it on the D-Bus. This is how everything is controlled in a GX.
In theory this should work.
My advice would be to install the large version of the firmware on the GX and then use NodeRed to connect to your own MQTT broker or Poll a webpage for control. You could also then program in what should happen if the connection is lost.
https://www.victronenergy.com/live/venus-os:large
