A more advanced way to debug your Arduino code is to use breakpoints and watches, which are features of some external debugging tools, such as Visual Studio Code, PlatformIO, or Atmel Studio.

Arduino Language Server extension for VS Code. Contribute to arduino/vscode-arduino-tools development by creating an account on GitHub.

Learn how to use LEDs, Serial Plotter, breakpoints, oscilloscope, and simulator to debug your Arduino code effectively.

test_arduino_code_hc12 The Arduino in the top of the hive (Transmitter) will send temperature, humidity, Sound frequency and battery voltage to the Arduino (Receiver) at the bottom of the hive ...

That provides a professional development environment, at least. The code base for the Arduino is another frustration. Bluntly, the use of setup() and loop() with main() being hidden really bugs me.