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

byte addresses[][6] = {"1Node", "2Node"};

char character;
int incomingByte = 0;
/****************** User Config ***************************/
/***      Set this radio as radio number 0 or 1         ***/
bool radioNumber = 0;

/* Hardware configuration: Set up nRF24L01 radio on SPI bus plus pins 7 & 8 */
RF24 radio(7, 8);
/**********************************************************/


// Used to control whether this node is sending or receiving
bool role = 0;


String message = ""; //message variable, empty until a message come
char messagechar[50];

void setup() {

  Serial.begin(115200);
  radio.begin();
  radio.setPALevel(RF24_PA_LOW);
  if (radioNumber) {
    radio.openWritingPipe(addresses[1]);
    radio.openReadingPipe(1, addresses[0]);
  } else {
    radio.openWritingPipe(addresses[0]);
    radio.openReadingPipe(1, addresses[1]);
  }
  Serial.println(F("welcome in messenger"));
  Serial.println(F("enter a message"));
}

void loop() {

  while (Serial.available()) { //getting message from the serial

    character = Serial.read();
    message.concat(character);
    delay (10);
  }

  if (message != "") {     //if there is a message
    radio.stopListening();
    Serial.print("                              you sent : ");
    Serial.println(message);
    message.toCharArray(messagechar,50); // convert String into char for transmisssion (maxium 50 characters)
    message = ""; // reset the message variable

    if (!radio.write( &messagechar, sizeof(messagechar) )) {
      Serial.println(F("failed"));
      messagechar[0] = (char)0; // reset the message variable
    } else {
      messagechar[0] = (char)0;   // reset the message variable
    }
  }


  radio.startListening();
  while (radio.available()) {                          // While there is data ready
    radio.read( &messagechar, sizeof(messagechar) );             // Get the payload



  if ( strlen(messagechar) != 0) {       //if we received a message, display it
    Serial.print("friend sent : ");
    Serial.println(messagechar);
    messagechar[0] = (char)0;; //reset the char message


  }
  delay (250);
  messagechar[0] = (char)0;;   //reset the char message

}}