Based on where you are in the code,
config can mean various things.
On the hass object is an instance of the Config class. The Config class contains the users preferred units, the path to the config directory and which components are loaded. See available methods.
config parameter passed to a component setup is a dictionary containing all of the user supplied configuration. The keys of the dictionary are the component names and the value is another dictionary with the component configuration.
The object will have already been validated using your
PLATFORM_SCHEMA if available. If you have defined a
PLATFORM_SCHEMA, all references to your component (ie
light 2: etc) will have been changed to be accessible as a list under
If your configuration file contains the following lines:
example: host: paulusschoutsen.nl
Then in the setup method of your component you will be able to refer to
config['example']['host'] to get the value
config parameter passed to a platform setup function is only the config for that specific platform.