feat: #500 Add EVU2 and SmartGrid status sensors

[siedi]

• Add EVU2 binary sensor (calculation ID 185: ID_WEB_HZIO_EVU2)
• Add SmartGrid status sensor with 4 states based on EVU+EVU2
• SmartGrid status: locked, reduced, normal, increased operation
• Dynamic state-based icons for SmartGrid status
• Sensor becomes unavailable when SmartGrid switch is disabled
• Add translations for DE, EN, CS, NL, PL

[rhammen]

@siedi Can you please change the pl.json. cs.json and de.json files to use JSON with all special characters converted to \uXXXX Unicode escape sequences.

[rhammen]

            and (
                description.luxtronik_key == LC.UNSET
                or key_exists(coordinator.data, description.luxtronik_key)
            )

Not all firmware versions may have the LP.P1030_SMART_GRID_SWITCH parameter that you use in the code later. So you need check here that this key exists, otherwise we will get complaints from users using firmware versions that do not yet support this parameter.

Ideally you also check for existence of the keys
LC.C0031_EVU_UNLOCKED and LC.C0185_EVU2
but the risk is significantly less because if LP.P1030_SMART_GRID_SWITCH exists then these should also exist.

[rhammen]

Would it be possible to put the whole code block starting with
if self.entity_description.key == SensorKey.SMART_GRID_STATUS:
in a separate function?
So we get

       if self.entity_description.key == SensorKey.SMART_GRID_STATUS
            some_function_doing_all_the required_things
       else:
            # For normal status sensors, use the parent's update logic
            super()._handle_coordinator_update(data)

This would keep the _handle_coordinator_update() function more readable.

[eliaslecomte]

Cool work! Just curious, would it be possible to change the smartgrid status from home assistant? Or are physical relais always required?

[siedi]

Cool work! Just curious, would it be possible to change the smartgrid status from home assistant? Or are physical relais always required?

Nope, you need the physical relay. There is now way to set EVU/2