I used ArduinoSTL library ( GitHub - mike-matera/ArduinoSTL: An STL and iostream implementation based on uClibc++ that supports my CS-11M class. ) with Atmel AVR microcontrollers and PlatformIO. I failed to find a similar option for ESP32. Any pointers would be appreciated.

Never mind. STL is already included in my project: [env:esp32cam] platform = espressif32 board = esp32cam I can: #include <vector> #include <chrono> and it works just fine. Excellent! PlatformIO is really a great tool!