Develop addon with Python

Hi everybody,
I am looking for a full python addon example,
Is it necessary to use rootfs or not?
The example here in the How-to looks not complete is complete different to the Addon Template, I found an addon which is developed in C# which doesn’t use this structure, too.
My question is, is there a new complete python example or a an example which using all the configs?

Sorry for my noob question :frowning:

I’m afraid you are mixing up a lot of concepts.
What are you trying to achieve, exactly?

a simple addon written in Python which is using
homeassistant_api
the correct folder structure
read parameters
internal communication between addon and core for device update

Sorry, but you don’t provide enough details to suggest whether you need a “custom component”, an integration coded in python, or an actual addon, i.e. a full application hosted inside a docker container.

I will develop an Application which will fetch data from the cloud and provide these data as an Device
I wrote an Viessmann Gridbox Connector to get my Photovoltaic data (Production/Consumption)
I saw this the best way to provide a Service for all Persons not only for me.

unl0ck/homeassistant-addon-viessmann-gridbox: Fetching Viessmann Data over Gridbox Send via MQTT (github.com)