source: rtos_arduino/trunk/arduino_lib/libraries/Bridge/examples/SpacebrewYun/spacebrewBoolean/spacebrewBoolean.ino@ 136

/*
  Spacebrew Boolean
 
 Demonstrates how to create a sketch that sends and receives a
 boolean value to and from Spacebrew. Every time the buttton is 
 pressed (or other digital input component) a spacebrew message 
 is sent. The sketch also accepts analog range messages from 
 other Spacebrew apps.

 Make sure that your Y炭n is connected to the internet for this example
 to function properly.
 
 The circuit:
 - Button connected to Y炭n, using the Arduino's internal pullup resistor.
 
 created 2013
 by Julio Terra
 
 This example code is in the public domain.
 
 More information about Spacebrew is available at: 
 http://spacebrew.cc/
 
 */

#include <Bridge.h>
#include <SpacebrewYun.h>

// create a variable of type SpacebrewYun and initialize it with the constructor
SpacebrewYun sb = SpacebrewYun("spacebrewYun Boolean", "Boolean sender and receiver");

// variable that holds the last potentiometer value
int last_value = 0;

// create variables to manage interval between each time we send a string
void setup() { 

        // start the serial port
        Serial.begin(57600);

        // for debugging, wait until a serial console is connected
        delay(4000);
        while (!Serial) { ; }

        // start-up the bridge
        Bridge.begin();

        // configure the spacebrew object to print status messages to serial
        sb.verbose(true);

        // configure the spacebrew publisher and subscriber
        sb.addPublish("physical button", "boolean");
        sb.addSubscribe("virtual button", "boolean");

        // register the string message handler method 
        sb.onBooleanMessage(handleBoolean);

        // connect to cloud spacebrew server at "sandbox.spacebrew.cc"
        sb.connect("sandbox.spacebrew.cc"); 

        pinMode(3, INPUT);
        digitalWrite(3, HIGH);
} 


void loop() { 
        // monitor spacebrew connection for new data
        sb.monitor();

        // connected to spacebrew then send a new value whenever the pot value changes
        if ( sb.connected() ) {
                int cur_value = digitalRead(3);
                if ( last_value != cur_value ) {
                        if (cur_value == HIGH) sb.send("physical button", false);
                        else sb.send("physical button", true);
                        last_value = cur_value;
                }
        }
} 

// handler method that is called whenever a new string message is received 
void handleBoolean (String route, boolean value) {
        // print the message that was received
        Serial.print("From ");
        Serial.print(route);
        Serial.print(", received msg: ");
        Serial.println(value ? "true" : "false");
}