String communication over serial for arduino is annoying and frankly, more obtuse than it should be but it is what it is. Examples and code vary and in general they either stop short or carry on so ...

But using a debugger might need additional hardware (most times expensive) and also additional time. Being an Arduino fan boy, one thing we all can agree is using serial print statements for debugging ...

🔁 SPI Communication Between ESP32-S3 and Arduino Uno (String Exchange) This project demonstrates full-duplex SPI communication between an ESP32-S3 (running Zephyr RTOS) and an Arduino Uno. The goal ...

While the Arduino family of boards connect to your computer using a USB virtual serial port, the ATmega ones have an actual serial connection on-board.