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Previously, it was hardcoded to 2000 ppm, which
remains the default value.

Clarify documentation of `reset` command

See merge request !9

The old wording 'sensor' for the whole controller can be
misleading.

If calibration is finally reliable, let's update the version!

co2_sensor: Add console command for SCD30 reset

See merge request !8

co2_sensor: Do not reset ESP after calibration

See merge request co2ampel/ampel-firmware!7

A soft reset of the SCD30 sensor, i.e.
calling `SCD30.reset()` was added in commit
fe023428 to force an instant update of
the measurement interval after bootup.

It seems, however, that the calibration
value is not stored if the sensor is
reset before carrying out at least one
measurement after calibration.
This breaks calibration with the current code,
because the ESP (and then the SCD30) is reset
directly after calibration.

* Trying 10s instead.
* Adding warning if timestep < 10s

Forced calibration should hopefully be more reliable now.

https://codereview.stackexchange.com/questions/260122/interactive-shell-for-arduino