Sming
Open source framework simplifying the creation of C++ applications
...Sming is open source, modular and supports multiple architectures including ESP8266 and ESP32. Superb performance and memory usage (Sming compiles to native firmware!) Fast and user-friendly development. Integrated host emulator to assist with developing, testing, and debugging libraries and applications on a PC before uploading them to an actual microcontroller. Built-in powerful wireless modules. Compatible with standard Libraries use popular hardware in a few lines of code. Simple yet powerful hardware API wrappers. HardwareSPI library provides advanced asynchronous SPI device master capability including the use of ESP8266 ‘overlapped’ mode for reduced pin usage and dual/quad I/O support. ...