Access a luftdaten sensor locally

[mrueg]

This request might be a bit out of scope, but wanted to hear your opinion on that.
As a user I would like to request sensor information locally from a sensor using the data.json or prometheus endpoint, so I don't have to rely on network connectivity to the outer world.

Use case: Sensor data is consumed and utilized to do home automation (e.g. close windows if values go high). This should not rely on internet connectivity or availability of the luftdaten platform.

[fabaff]

It looks like that this can be done easily. Simply allow to use a local URL for the data (e.g., http://{ip-des-sensors}/data.json) while instantiating the object.