Sending commands to the vehicle via MQTT (FHEM)

[d0m2k3]

Hello Till,

I have installed your car connectivity including the MQTT and the WebUi.
Currently everything works fine with my FHEM environment (updates are correct etc.).
My vehicle has been created as a MQTT-Device and I am just unsing the topics I need.

How about sending commands to my vehicle?
I want to start the climatization via FHEM for example.
-> At my MQTT device in FHEM I have some subscriptions, but they dont work.

Is it possible to send commands via MQTT (and therefore via FHEM) to my vehicle?
Or the subscriptions are just missleading and the function is not available?

Thank you in advance!

[Thyraz]

It's not clear if your problem is FHEM specific or not, so I would try to debug and ask this question unrelated from the Smart Home solution you are using (as most users here won't be using FHEM).

First of all: Which car do you own and which command / commands did you try that didn't work?

I would then start with sending the command directly through mosquitto_pub from the CLI of your MQTT broker.
Or use a generic tool like MQTT explorer.
That way we have reproducable steps for others to compare.

[tillsteinbach]

If you go to the webui at /plugins/mqtt/status you can see all possible topics. If you scroll down to Listening on Topic you see all topics you can send commands to. For climatization it could look like carconnectivity/0/garage/YOURVIN/climatization/commands/start-stop_writetopic
if you send "start" to this topic your climatization should start. (how you configure this in FHEM I don't know). As Thyraz pointed out it is good to use e.g. MQTT explorer to try it out first. You can also see error topics coming up when you do something wrong.

[d0m2k3]

Thank you both for your advice.
The solution was easy at the end, like always.
I sent the following command and it does*t work: carconnectivity/0/garage/VID/climatization/commands/start-stop start

The topic at the end was wrong!
This works: carconnectivity/0/garage/VID/climatization/commands/start-stop_writetopic start

Finally to answer you question: It is working with and VW Passat GTE from 2022
And with FHEM it works fine.

Thank you!