How to control Vaillant heating

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Could you please share ebusd command that is changing desired flow temperature ?

@Piotr-Solarczyk
I don’t know about Hairpinder Sanghera, but I am only able to read and not write FlowTempDesired.
With the following command:

pi@raspberrypi:~ $ ebusctl read FlowTempDesired
When I want to write to the bus:
ebusctl write -c 350 FlowTempDesired 61.00
I get:
ERR: element not found

But if you only want to change the desired temp I normally use:
ebusctl write -c 350 Hc1DayTemp 20

In this case i have set the desired temp to 20 degrees, I don’t know if this is what you where looking for?

Yes, how do you control flow temp then ? Do you have to set this on 350 ? Or 350 set this based on the room temperature ?

I’m looking for solution to set flow temp on the boiler with or without controller.

Maybe it’s different command - because you read from boiler and set on 350 controller. Can you do ebusctl find ?

As far as I can see FlowTempDesired is defined as an read-only variable. But I did not find specific definitions for VRT350 in my ebus version. Could you run a “ebusctl info” and post the output?

Planning in upgrading the old heater by a vaillant ecotec plus 246 that comes with a WiFi thermostat vSmart. I would love to control the setpoint temperature from pimatic so that the modulation is done depending on the pimatic thermostat that I already use to control my radiator valves.

The question is, if that heater uses the wifi module, to control it from pimatic do we still need to have an ebus adapter or we can directly use the wifi interface?

Edit: I’ve just read that the vSmart thermostat is also called eRelax and seems to be compatible with IFTTT

For influencing the flow temperature, the approach I’ve taken is to turn the CH flow temp knob on the boiler to maximum, and control what the maximum should be using FlowsetHcMax e.g.

ebusctl write -c bai FlowsetHcMax 40

After building an ebus adapter and trying to get this to work it keeps failing on me.
I can see in pimatic that the ebus adapter is working but all commands are failing somehow.
Also when trying to read states with ebusctl in commandline the only reply is ERR: element not found.

when starting ebusd on the commandline with -f I can see communication with the heater and thermostat (vrt392).

looks like the config isnt loading or is wrong. Ive tried putting the configfiles locally (/etc/ebusd/) but it doesnt help.

Any ideas what im missing? Im guessing its something simple that Im overlooking in some way.