Temperature SPOT - Part 1

The following Java code is an implementation of a SunSPOT that upon receiving a request sends the temperature to the requestor.

package com.manorrock.sunspot.temperature;

import com.sun.spot.io.j2me.radiogram.RadiogramConnection;
import com.sun.spot.peripheral.Spot;
import com.sun.spot.sensorboard.EDemoBoard;
import com.sun.spot.sensorboard.peripheral.ITriColorLED;
import com.sun.spot.util.IEEEAddress;
import com.sun.spot.util.Utils;
import javax.microedition.io.Connector;
import javax.microedition.io.Datagram;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

/**
 * Temperature SPOT.
 *
 *  This spot midlet opens a datagram for receiving at port 10. 
 *  Once it receives a datagram it converts the data to a string. 
 *  If the string is a dotted address and it equals our own address
 *  then send the temperature back to the originator of the datagram
 *  received at port 10, using a datagram to port 11. If the string
 *  is "sleep" then go into sleep mode.
 *
 *  Note the LEDs are used to signal changes in state. LED 0 is 
 *  red whenever the application started up successfully and is 
 *  ready to receive datagrams on port 10. LED 1 is turned to 
 *  green when a datagram is received. LED 2 is turned to green 
 *  when the packet was meant for this SPOT. LED 3 is turned to
 *  green if the response was properly sent. LED 4 is set to blue 
 *  if an exception occured. LED 0 is set to blue if the SPOT 
 *  goes into sleep mode.
 *
 * @author Manfred Riem (mriem@manorrock.com)
 */
public class StartApplication extends MIDlet {
    /**
     * Start application.
     */
    protected void startApp() throws MIDletStateChangeException {
        IEEEAddress ourAddr = new IEEEAddress(Spot.getInstance().getRadioPolicyManager().getIEEEAddress());
        ITriColorLED [] leds = EDemoBoard.getInstance().getLEDs();
        leds[0].setOn();
        leds[0].setRGB(100, 0, 0);

        while(true) {
            leds[4].setOff();
            
            try {
                RadiogramConnection connection = (RadiogramConnection) Connector.open("radiogram://:10");
                Datagram datagram = connection.newDatagram(connection.getMaximumLength());
                connection.receive(datagram);
                String request = datagram.readUTF();
                connection.close();
                leds[1].setOn();
                leds[1].setRGB(0, 100, 0);

                if (request.equals(ourAddr.asDottedHex())) {
                    leds[2].setOn();
                    leds[2].setRGB(0, 100, 0);
                    connection = (RadiogramConnection) Connector.open("radiogram://broadcast:11");
                    connection.setTimeout(5000);
                    datagram = connection.newDatagram(connection.getMaximumLength());
                    datagram.writeDouble(EDemoBoard.getInstance().getADCTemperature().getFahrenheit());
                    connection.send(datagram);
                    connection.close();
                    leds[3].setOn();
                    leds[3].setRGB(0, 100, 0);
                }
                else if (request.equals("sleep")) {
                    leds[0].setOn();
                    leds[0].setRGB(0, 0, 100);
                    Utils.sleep(1000);
                    leds[0].setOff();
                    Spot.getInstance().getSleepManager().enableDeepSleep();
                }
                else {
                    leds[2].setOn();
                    leds[2].setRGB(100, 0, 0);
                }

                connection.close();
                leds[1].setOff();
                leds[2].setOff();
                leds[3].setOff();
                leds[4].setOff();
            }
            catch(Exception exception) {
                // exception.printStackTrace();
                leds[4].setOn();
                leds[4].setRGB(0, 0, 100);
            }

            Utils.sleep(1000);
        }
    }

    /**
     * Pause application
     */
    protected void pauseApp() {
    }

    /**
     * Destroy application.
     *
     * @param force the force flag.
     * @throws MIDletStateChangeException
     */
    protected void destroyApp(boolean force) throws MIDletStateChangeException {
    }
}

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