ESP8266 is a cost-effective and highly integrated Wi-Fi MCU with built-in TCP/IP networking software for IoT applications. ESP8266 integrates an enhanced version of Tensilica’s L106 Diamond series 32-bit processor and on-chip SRAM.

• Home (home page in the PlatformIO Registry)
• Documentation (advanced usage, packages, boards, frameworks, etc.)

1. Install PlatformIO
2. Create PlatformIO project and configure a platform option in platformio.ini file:

[env:stable]
platform = espressif8266
board = ...
...

[env:development]
platform = https://github.com/platformio/platform-espressif8266.git
board = ...
...

Please navigate to documentation.