Add "Soil temperature" property for thermostat

[TastyPi]

The HELTUN HE-HT01 thermostat provides both an "Air temperature" and "Soil temperature" property in its CommandClass.SENSOR_MULTILEVEL. I'd like to create a ZWaveDiscoverySchema which displays the correct temperature based on the "Source Sensor" configuration parameter (parameter number 11).

Other code in home-assistant/core uses constants from this lib to refer to properties, so I assume it is best practice to list them here before using them there. Let me know if I'm mistaken.

[TastyPi]

See https://community.home-assistant.io/t/heltun-thermostat-card-how-to-display-floor-instead-of-air-temperature/651557 for some background.

[raman325]

thanks for your PR! The properties should go here though: https://github.com/home-assistant-libs/zwave-js-server-python/blob/master/zwave_js_server/const/command_class/multilevel_sensor.py

but what makes more sense is probably to update this script to add property constants to make this easier: https://github.com/home-assistant-libs/zwave-js-server-python/blob/master/scripts/generate_multilevel_sensor_constants.py

I'd personally prefer the latter as then we are covered for all of them

[raman325]

hey so I went ahead and implemented this because these scripts are not architected very well and it would take you a lot longer than it just took me to make the necessary changes. Thank you again though, this was a great idea

[TastyPi]

@raman325 Thanks for the help! Could I get a new version of this released so I can try contributing the config for my thermostat to homeassistant/core?

[raman325]

no problem! I have one more PR in flight that we should be able to merge soon and then we can create a release. If it takes longer than a week, just tag me again and we can make a patch release for this one update