Use ppm for indoor volatile organic compounds sensor to respect unit …

[bulanovk]

According to API response filed "unit" ppm should be used instead of µg/m³ for "indoor volatile organic compounds" sensor

{
                    "basic_id": 1,
                    "name": "indoor volatile organic compounds[1]_HealthBox 3[Healthbox3]",
                    "parameter": {
                        "concentration": {
                            "unit": "ppm",
                            "value": 450.0
                        },
                        "concentration_maximum": {
                            "unit": "ppm",
                            "value": 576.0799999999945
                        },
                        "raw": {
                            "unit": "ppm",
                            "value": 48367.0
                        }
                    },
                    "type": "indoor volatile organic compounds"
                }

[bulanovk]

@rmassch Could you please review and reintegrate changes?

[rmassch]

Hey @bulanovk

According to the following article the device class needs to be changed to VOLATILE_ORGANIC_COMPOUNDS_PARTS to allow ppm.
https://www.home-assistant.io/integrations/sensor#device-class

If you could update your PR with that, it should be good to go. Otherwise it'll throw warnings:

volatile_organic_compounds (<class 'custom_components.healthbox.sensor.HealthboxRoomSensor'>) is using native unit of measurement 'ppm' which is not a valid unit for the device class ('volatile_organic_compounds') it is using; expected one of ['µg/m³']

[bulanovk]

Hello @rmassch, i changed device class according to you advice.

[rmassch]

@bulanovk I may be overlooking things due to being tired but I don't think I see the commit where you changed the device class?

[bulanovk]

Sorry it was overwritten somehow by Github rebase.
I commit it once more