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Description
Some modbus client (e.g pymodbus) assert dtr before transmitting, this lead to reset arduino to bootloader ( i spent one day around the problem on arduino-nano used as modbus-slave)
Resolved disabling reset with a 120 ohm resistor from 5v to rst to disable dtr reset.
After that, my program works flawless
Not an issue but i think would be nice to warn user if strange behaviour happen.
Thank you for sharing your work!