Support Device Classes

[rklomp]

This is an untested change proposal for https://github.com/home-assistant/core/issues/49592

[rklomp]

Tested this in my home assistant instance (running core-2021.5.0b2) and still working fine. I have asked @itinside to test it as well to see it it fixes https://github.com/home-assistant/core/issues/49592

[rklomp]

Just found this in de javascript of the webinterface:

    DevClassInverter: "1",
    DevClassBattery: "7",
    DevClassEnergyMeter: "65"

Looks like these are the options.

And:

this.getDevClassAndValuesArrayFromValueObject = function(a) {
        if (angular.isObject(a)) {
            var b = Object.keys(a);
            if (1 !== b.length) return void c.error(a, "has more or less than one device class. Not supported yet!");
            var d = b[0];
            return {
                devClass: d,
                valuesArray: a[d]
            }
        }

Looks like even the web interface only supports one device class.

[kellerza]

Great, so val and then wildcard *[{}]val should be ok as well.

[rklomp]

I will have a look if I can create a similar function in pysma and extract the device class to inject that in the JMESPATH_VAL. It might be usefull later to only load the sensors specific to that device class in HA.

[rklomp]

@kellerza , How about this. This will extract the devclass on first read and uses the stored value on subsequent reads.

After this is merged I could create a sensor map that maps certain sensors to specific device classes. For example the sensors mentioned in https://github.com/kellerza/pysma/issues/58 will only be used for devclass == 7

[rklomp]

Depending whether multiple devices classes are served from the same device, we might need a different approach. Tring to figure that out in https://github.com/kellerza/pysma/issues/58