Feature/Build Help: Add Modbus TCP Server to HeishaMon + working platformio.ini for Windows

[ReinhardGruber]

Summary
I’d like to extend HeishaMon with a Modbus TCP Server (to simplify integration with systems like Loxone). To prototype this, I need to build the firmware locally. I’m stuck getting the project to compile with PlatformIO on Windows.

What I’m trying to do:
Build HeishaMon locally (Windows 11) and then add a Modbus TCP Server.
Target device: ESP32-S3 DevKitC-1 (N8, no PSRAM) – only the “large” build is needed.

Where I’m stuck:
I don’t have a working platformio.ini for this repo/environment on Windows.
I also tried the PIO Arduino integration in VS Code, but no luck.

Environment:
Windows 11
VS Code + PlatformIO (pioarduino)

(Tried Arduino Core 3.x too; ran into ESP32 Ethernet API changes vs. older code)

Ask:
Does anyone have a known-good platformio.ini for building HeishaMon (large) on Windows for ESP32-S3 DevKitC-1?
If ESP32 core 2.0.17 (older Ethernet API) is required, could you share the exact platform/framework-arduinoespressif32 pins that work?
Any build flags or lib versions I should lock to avoid ETH.hasIP()/W5500 API breakage?

Why this matters:
Once I can build reliably, I’ll open a clean PR adding a Modbus TCP Server (configurable port, basic holding/input registers, and a minimal map for the main HeishaMon datapoints).

Thanks!

[geduxas]

You should fallow GitHub workflow for compilation.. i done same (platform Io)with small one. And everything worked. OS indeed not matters