Release 2.1.1 adds support of ESP32 platform.

Use Arduino IDE and toolchain from https://dl.espressif.com/dl/package_esp32_index.json

Some configuration changes to start playing:

1. config.hpp

// Arduino IO module
#define CONF_MODULE_ARDUINOIO     0

...

// Input select
#define S_INPUT SERIAL_I

// Output select
#define S_OUTPUT SERIAL_O

 2. config.h

/*
 * SAVE, LOAD and CHAIN commands support
 */
#define USE_SAVE_LOAD        0