The ESP32 family of microcontrollers are capable devices with many built-in peripherals, including Bluetooth and Wi-Fi. The official SDK and toolchain is the ESP IoT Development Framework (ESP-IDF) and uses FreeRTOS as its real-time operating system.

However, in this tutorial series, we'll use the Zephyr real-time operating system and SDK to program the firmware for the ESP32.

Links:
Zephyr Getting Started Guide: https://docs.zephyrproject.org/latest...
ESP32 specific instructions: https://docs.zephyrproject.org/latest...
ESP32 Technical Reference Manual: https://www.espressif.com/sites/defau...
Zephyr Devicetree Mysteries, Solved:    • Zephyr Devicetree Mysteries, Solved -...  
Github repository: https://github.com/bokfink/esp32_zeph...