Arduino To PubNub In Two Steps

1.h

#include <SPI.h>
#include <Ethernet.h>
#include <Pubnub.h>
#include "string.h"
#include "iotconnector.h"

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

char pubkey[] = "PUBLISH KEYS HERE";char subkey[] = "SUBSCRIBE KEYS HERE";char channel[] = "iotchannel";char uuid[] = "Arduino";

iotbridge arduino;

void initialize(){
        Serial.begin(9600);
	Serial.println("Serial set up");

	while (!Ethernet.begin(mac)) {
		Serial.println("Ethernet setup error");
		delay(1000);
	}
	Serial.println("Ethernet set up");
	PubNub.begin("demo", "demo");
}

void do_something(String value){
          Serial.println("in the callback");
          Serial.println(value);
        }
void setup()
{  
	initialize();
	arduino.init( pubkey, subkey, uuid);       
}

void loop()
{      
        String returnmessage;
	Ethernet.maintain();
        
        //Publish
        arduino.send(channel,"\"Hey There\"");

        //Subscribe 
        returnmessage = arduino.connect(channel); 
        
        //callback function of sorts, to work with the received message
        do_something(returnmessage); 
	Serial.println();
}

2.h

bool iotbridge::send(const char *channel, const char *message){
  EthernetClient *client;
  client = PubNub.publish(channel, message);
  return client;
}

3.h

String iotbridge::connect(const char *channel){  
  PubSubClient *pclient = PubNub.subscribe(channel);