adjust modbus id

[ndrsnhs]

No description provided.

[fawick]

@ndrsnhs Were you able to verify whether the changes in this PR are compatible with pre-2022 devices (e.g AlphaESS Smile B3)? AlphaESS tended to experiment with ModBus TCP register definitions quite a bit over the last years, leading to inconsistencies.

[ndrsnhs]

Due to a change in providing the Modbus ID the module is no longer able to read values from the grid meter at all. This PR doesn't affect the adresses of any registers. It basically removes subfunctions to reduce complex code design and improve readability. The check for API versions moved from line 39 to line 35, directly followed by reading the specified registers.
Due to the lack of pre v123 systems it's currently tested on post v123 systems only.
Conclusion: If the AlphaESS System delivered values before the change it will do so in the future. If this is about a new/ unsupported system I need further Information...

[fawick]

Understood, thank you for clarifying this.