Ciao MQTT Bluemix

/*

  Arduino Ciao example

 This sketch uses Ciao mqtt connector. Sketch sends via MQTT brightness and temperature information that will be shown graphically in the blueMix IBM system.

 Upload your sketch an than connect to the webpage:

 https://quickstart.internetofthings.ibmcloud.com/#/device/BlueMixTest902345/sensor/

  NOTE: be sure to activate and configure mqtt connector on Linino OS.

       http://www.arduino.org/learning/reference/ciao-library

 created September 2015

 by andrea[at]arduino[dot]org

 */

#include <Ciao.h>

int ctrl=0;
void setup()
{

  Ciao.begin();  //Start the serial connection with the computer

                       //to view the result open the serial monitor

  pinMode(9,OUTPUT);
}

void loop()                     // run over and over again
{

   //getting the voltage reading from the temperature sensor

   int readingTemp = analogRead(A0);

   // converting readingTemp to voltage

   float voltage = readingTemp * 4.56;

   voltage /= 1024;

   // now print out the temperature

   float temperatureC = (voltage - 0.5) * 100 ;

   int readingLum = analogRead(A2);

   analogWrite(9,map(readingLum,0,1023,0,255));

   if (ctrl>=10){

     Ciao.write("mqtt","iot-2/evt/status/fmt/json","{\"d\": {\"temperature\":"+String(temperatureC)+",\"luminosity\":"+String(readingLum)+"}}");

     ctrl=0;

   }

   ctrl++;

   delay(100);

}