RF24 issue with Hologram Dash

rf24.ino

/*
 Copyright (C) 2012 James Coliz, Jr. <[email protected]>
 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 version 2 as published by the Free Software Foundation.
 
 Update 2014 - TMRh20
 */
 /**
 * Simplest possible example of using RF24Network 
 *
 * TRANSMITTER NODE
 * Every 2 seconds, send a payload to the receiver node.
 */
#include <RF24Network.h>
#include <RF24.h>
#include <SPI.h>
RF24 radio(D01,D02);                    // nRF24L01(+) radio attached using Getting Started board 
RF24Network network(radio);          // Network uses that radio
const uint16_t this_node = 01;        // Address of our node in Octal format
const uint16_t other_node = 00;       // Address of the other node in Octal format
const unsigned long interval = 2000; //ms  // How often to send 'hello world to the other unit
unsigned long last_sent;             // When did we last send?
unsigned long packets_sent;          // How many have we sent already
struct payload_t {                  // Structure of our payload
  unsigned long ms;
  unsigned long counter;
};
void setup(void)
{
  Serial.begin(57600);
  
  for (int i = 10; i > 0; i--) {
    Serial.print("Waiting ");
    Serial.print(i);
    Serial.println(" seconds for serial monitor...");
    delay(1000);
  }

  Serial.println("RF24Network/examples/helloworld_tx/");
 
  Serial.println("SPI starting...");
  SPI.begin();
  Serial.println("RF24 radio starting...");
  radio.begin();
  Serial.println("RF24 network starting...");
  network.begin(/*channel*/ 90, /*node address*/ this_node);
}
void loop() {
  
  network.update();                          // Check the network regularly
  
  unsigned long now = millis();              // If it's time to send a message, send it!
  if ( now - last_sent >= interval  )
  {
    last_sent = now;
    Serial.print("Sending...");
    payload_t payload = { millis(), packets_sent++ };
    RF24NetworkHeader header(/*to node*/ other_node);
    bool ok = network.write(header,&payload,sizeof(payload));
    if (ok)
      Serial.println("ok.");
    else
      Serial.println("failed.");
  }
}