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Does this issue still persist with newer versions (for Dashing or ideally Foxy)? We have improved the tutorials a lot in the last months. Please let us know if you face any issues with them. If you want to start with real microcontroller hardware, I recommend https://micro-ros.github.io/docs/tutorials/core/first_application_rtos/freertos/. If you use an ESP32, the wiring is even simpler than with the Olimex STM32-E407. And, we promise to watch answers.ros.org more intensively!