examples/RF24Network/helloworld_txEncryption/helloworld_txEncryption.ino

 
#include <nrf_to_nrf.h>
#include <RF24Network.h>
 
//Set up our encryption key
uint8_t myKey[16] = {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6};
 
nrf_to_nrf radio;  // nRF24L01(+) radio attached using Getting Started board
 
RF52Network 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;  // How often (in ms) 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(115200);
  while (!Serial) {
    // some boards need this because of native USB capability
  }
  Serial.println(F("RF24Network/examples/helloworld_tx/"));
 
  if (!radio.begin()) {
    Serial.println(F("Radio hardware not responding!"));
    while (1) {
      // hold in infinite loop
    }
  }
 
  radio.setKey(myKey);           // Set our key and IV
  radio.enableEncryption = true; // Enable encryption
  radio.enableDynamicPayloads(123); //This is important to call so the encryption overhead will not be included in the 32-byte limit
                                    //To overcome the 32-byte limit, edit RF24Network.h and set MAX_FRAME_SIZE to 111
  radio.setChannel(90);
  network.begin(/*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(F("Sending... "));
    payload_t payload = { millis(), packets_sent++ };
    RF24NetworkHeader header(/*to node*/ other_node);
    bool ok = network.write(header, &payload, sizeof(payload));
    Serial.println(ok ? F("ok.") : F("failed."));
  }
}