Arduino TX

// TX
#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#include <printf.h>

RF24 radio(7,8); // CE, CSN

const uint64_t addr = 0x0a0c0a0c0aLL;
//char msg[100];

void setup() {
  Serial.begin(9600);
  radio.begin();
  printf_begin();
  radio.openWritingPipe(addr);
  radio.printDetails();
  delay(1000);
}

void loop() {
  const char text[] = "Hello World";
  radio.write(&text, sizeof(text));
  delay(1000);
}