[FEATURE] PlatformIO Support (pioarduino)

[rambros3d]

Problem Statement

The standard Arduino cli cannot handle multiple board configurations within a single code. Managing dependencies and switching between different target hardware would require global setting change.
In case of flashesp.com, we would need to create a new project for each board.

Proposed Solution

The pioarduino core would be a good option in addition to the arduino cli. Since the platformio.ini will have the build flags, environment and dependencies.

Benefit

• Library Management: pioarduino automatically handles library dependencies and versions (easier than using libraries_lock.json), pioarduino also allows the use of custom libraries.
• Multi-Board Support: It allows multiple board configurations to coexist in a single code base. Useful for projects which have multiple boards variations.
• Easier Customization: Users can easily customize build flags and settings in the configuration file before flashing, without modifying the arduino code. The users can be allowed to edit the platformio file in the flashesp UI before flashing.

[cjaca]

Hi @rambros3d! thanks a lot for kicking this off and sharing the first idea for a PlatformIO (pioarduino) feature 🙌

To be honest, from the very beginning of flashesp.com I’ve felt the need to support PlatformIO for compiling projects, especially for multi-board setups, dependency management, and build flag configuration.

Right now we’re focusing heavily on application stability and preparing a solid test suite that covers all major use cases and edge cases. Once that foundation is in place, we’re moving forward strongly with development and PlatformIO support is definitely on our radar as an important next step, since it will bring even more users to FlashESP.