Add SCD40/41 support

[Arnold-n]

Description:

Adds Sensirion SCD40/SCD41 CO2 sensor support.
Related discussion: #11329

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.4.9
• The code change is tested and works with Tasmota core ESP32 V.1.0.7.3
• I accept the CLA.

Code change is tested and works on ESP8266 with Tasmota 9.5.0.8, not sure which core version.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass

[s-hadinger]

Thanks for your PR. You may need to wait for a week or two before Theo can merge

[Arnold-n]

Thanks s-hadinger!
According to sergios100 (#11329), it works on ESP32 too.

[Jason2866]

Imho enabling both SCD30 AND SCD40 as default is to much. For example the SPS30 is not enabled at all. For backwards compatibility of the firmware, please disable the SCD40 driver.

[Arnold-n]

What's the reason not to enable it by default, code size vs expected interest? And do you want it excluded for the ESP32 image too? As you likely know the SCD30 and SCD40 (or SPS30) are unrelated devices: the SCD30 is NDIR while the SCD40 is a miniature sensor based on the photoacoustic sensing principle.

As another (newby) question, currently the SCD40xxx read operations return -1 in case of failure (and a data value otherwise), while write operations return -1 in case of failure or 0 otherwise - should I change the latter also to "or a data value otherwise" ?

[Jason2866]

Simple reason not all sensors can be enabled. It is Theos decision what will enabled by default.
The decision is based on what sensors are most used.

[Arnold-n]

Sorry for a mistaken "merge branch" - undone by a force push.

[arendst]

Pls disable as the image will become too big to support easy installation

[Arnold-n]

Disabled in sensors, not in ESP32, let me know if you intended to have that changed too.

[arendst]

Thx.