source: rtos_arduino/trunk/arduino_lib/libraries/PubNub/examples/PubNubPublisher/PubNubPublisher.ino@ 211

/*
  PubNub sample client

  This sample client will publish raw (JSON pre-encoded) PubNub messages.

  Circuit:
  * Ethernet shield attached to pins 10, 11, 12, 13
  * (Optional.) Analog sensors on pins A0 to A5.
  * (Optional.) LED on pin 9 for success indication.

  created 23 October 2012
  by Petr Baudis

  https://github.com/pubnub/pubnub-api/tree/master/arduino
  This code is in the public domain.
  */

#include <SPI.h>
#include <Ethernet.h>
#include <PubNub.h>

// Some Ethernet shields have a MAC address printed on a sticker on the shield;
// fill in that address here, or choose your own at random:
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

const int pubLedPin = 9;

char pubkey[] = "demo";
char subkey[] = "demo";
char channel[] = "hello_world";

void setup()
{
        pinMode(pubLedPin, OUTPUT);
        digitalWrite(pubLedPin, LOW);

        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(pubkey, subkey);
        Serial.println("PubNub set up");
}

void flash(int ledPin)
{
        /* Flash LED three times. */
        for (int i = 0; i < 3; i++) {
                digitalWrite(ledPin, HIGH);
                delay(100);
                digitalWrite(ledPin, LOW);
                delay(100);
        }
}

void loop()
{
        Ethernet.maintain();

        EthernetClient *client;

        char msg[64] = "{\"analog\":[";
        for (int i = 0; i < 6; i++) {
                sprintf(msg + strlen(msg), "%d", analogRead(i));
                if (i < 5)
                        strcat(msg, ",");
        }
        strcat(msg, "]}");

        Serial.print("publishing message: ");
        Serial.println(msg);
        client = PubNub.publish(channel, msg);
        if (!client) {
                Serial.println("publishing error");
        } else {
                flash(pubLedPin);
                client->stop();
        }

        delay(5000);
}