​Am I doing this right? I'm not getting anything at all. It says "Starting" and then nothing at all... Other NRF24 lib examples work with my arduino, but mine doesn't even print the radio config like it should before it enters the loop.

PCBEinstein.ino

#include <SPI.h>
#include "nRF24L01.h"
#include "RF24.h"
#include "printf.h"

RF24 radio(9,10);

const int min_payload_size = 4;
const int max_payload_size = 32;
const int payload_size_increments_by = 1;
int next_payload_size = min_payload_size;

char receive_payload[max_payload_size+1]; // +1 to allow room for a terminating NULL char


void setup() {
  // put your setup code here, to run once:

  Serial.begin(115200);
  printf_begin();
  Serial.println(F("Starting"));

  radio.begin();
  radio.setAutoAck(false);
  
  radio.enableDynamicPayloads();
  
  radio.openReadingPipe(0,0xC7B6A5);
  radio.openReadingPipe(1,0xFCFBFA);
  radio.openReadingPipe(2,0xF1);
  
  radio.setChannel(31); //PCB channel 3

  radio.startListening();

  radio.printDetails();

}

void loop() {

    
    while ( radio.available() )
    {

      // Fetch the payload, and see if this was the last one.
      uint8_t len = radio.getDynamicPayloadSize();
      
      // If a corrupt dynamic payload is received, it will be flushed
      if(!len){
        continue; 
      }
      
      radio.read( receive_payload, len );

      // Put a zero at the end for easy printing
      receive_payload[len] = 0;

      // Spew it
      Serial.print(F("Got response size="));
      Serial.print(len);
      Serial.print(F(" value="));
      Serial.println(receive_payload);

      // First, stop listening so we can talk
      radio.stopListening();

      // Send the final one back.
      radio.write( receive_payload, len );
      Serial.println(F("Sent response."));

      // Now, resume listening so we catch the next packets.
      radio.startListening();
    }

}