Arduino Nano V3 only runs sketch correctly after hitting reset or starting serial monitor

Projects Programming
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I don't have a state machine tutorial link at hand, but maybe some readers could supply that.

You should probably learn the switch statement,
which comes in handy to implement a state machine.

For the NRF part, you should probably use RF24_250KBPS,
which has a longer reach and higher error margin.

https://nrf24.github.io/RF24/classRF24.html#aeb9920e7a95699748b003c4a839b0814