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Serial communication with Arduino

I have a problem with serial communication with the Arduino MEGA. I am using ESP32_ex1_getting_started to send data from phone to ESP32. It works fine. I can see my data in ESP32. The problem arises when I try to send this data to the Arduino via the serial port. After running the program on ESP32, data is not sent to Arduino. Only when I press the EN button all data that has not been sent are sent at once as if they were waiting in the buffer. Also, disconnecting the RX cable from Arduino transmits data to Arduino. Let me mention that I use logic level converters during communication.

Regards and thank you for your help!

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