[Feature request]: add support for SDongle registers

[hedkvist]

Describe the issue

I'm using 2 Inverters in cascade. (11+11Kw)
In the Huawei GUI i can set 14.5kw maximum feed to grid under
Dongle -> Configuration -> Active Power Control -> Max grid feed in power.

When i'm trying from HA, i cant set greater then 11000. (11kw)

Describe your Huawei Solar Setup

Inverter Type: Huawei Sun2000-10KTL-M1 and Sun2000-10KTL-M0
Inverter Firmware version: V100R001C00SPC167
sDongle present: Yes
sDongle Type: sDongleA-05 WIFI/Ethernet
sDongle Connectivitiy: Ethernet
sDongle Firmware: V200R022C10SPC126
Power meter present: three phase
Optimizers Present: No
Battery: LUNA2000-SO None
Battery Firmware version: N/A
Huawei Solar integration version: 1.4.1

How do you connect to the inverter?

Please select your connection method

Upload your Diagnostics File

config_entry-huawei_solar-743c45dd48b53cc263c0bae5948c3ef3.json

Upload your relevant debug logs

File "/config/custom_components/huawei_solar/services.py", line 458, in set_maximum_feed_grid_power
    power = await _validate_power_value(service_call.data[DATA_POWER], bridge, rn.P_MAX)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/custom_components/huawei_solar/services.py", line 274, in _validate_power_value
    raise ValueError(f"Power cannot be more than {maximum_active_power}W")
ValueError: Power cannot be more than 11000W

Please confirm the following:

• I'm running the latest release of Home Assistant.
• I'm running the latest release of this integration.
• I did not find an existing issue describing this problem.
• I did upload the diagnostics-file that I could retrieve from the 'Devices & Services Page'
• I did upload the relevant debug logs (via 'Enable Debug Logging'-feature or by manually configuring HA logging)

[wlcrs]

You are trying to change a different setting than in FusionSolar. This integration does not provide dongle values/settings, only inverters and EMMA device are supported.

I don't own an SDongle, and don't want to add code I cannot test. If you are willing to contribute, you can add SDongle detection logic and registers to the underlying huawei-solar Python library. We can then add these SDongle sensors in this HA integration.

If you or anybody else wants to help: please let me know and I will provide some pointers to get you started.

[hedkvist]

I would love to help, but don't think i got the knowledge to do so. I'm not so good at Python.
If i can help with something that isn't to advanced, I'm happy to do so.

By the way: If i set feed to grid to e.g. 4000w. the value appears in the dongel.
But a value greater than 11000 isn't possible from HA. therefore I thought it would be enough to remove the 11000w limit in HA if you have e.g. 2 inverters. See pictures.

I looked in the code how to remove the 11000W limit but wasent sure how to do so.

`async def set_maximum_feed_grid_power(
hass: HomeAssistant, service_call: ServiceCall
) -> None:
"""Set Active Power Control to 'Power-limited grid connection' with the given wattage."""
bridge, uc = get_inverter_bridge(hass, service_call)
power = await _validate_power_value(service_call.data[DATA_POWER], bridge, rn.P_MAX)

await bridge.set(rn.MAXIMUM_FEED_GRID_POWER_WATT, power)
await bridge.set(
    rn.ACTIVE_POWER_CONTROL_MODE,
    rv.ActivePowerControlMode.POWER_LIMITED_GRID_CONNECTION_WATT,
)

await uc.async_refresh()`