Manfred Riem's Blog

Temperature SPOT - Part 2

package com.manorrock.sunspot.temperature;

import com.sun.spot.io.j2me.radiogram.RadiogramConnection;
import com.sun.spot.peripheral.Spot;
import com.sun.spot.util.IEEEAddress;
import com.sun.spot.util.Utils;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.ServerSocket;
import java.net.Socket;
import javax.microedition.io.Connector;
import javax.microedition.io.Datagram;

/**
 * Temperature Host.
 *
 * @author Manfred Riem (mriem@manorrock.org)
 */
public class SunSpotHostApplication {
    /**
     * Run method.
     */
    public void run() {
        IEEEAddress ourAddr = new IEEEAddress(Spot.getInstance().getRadioPolicyManager().getIEEEAddress());
        System.out.println("Our radio address = " + ourAddr.asDottedHex());
        
        try {
            ServerSocket server = new ServerSocket(8888);
            
            while(true) {
                try {
                    Socket socket = server.accept();
                    BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
                    BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
                    
                    String command = reader.readLine();
                    
                    if (command.equalsIgnoreCase("quit")) {
                        System.out.println("Quiting host application");
                        writer.write("Quiting host application\n");
                        break;
                    }
                    else if (command.equals("sleep")) {
                        System.out.println("Enabling deep sleep for all the temperature SPOTs");
                    }
                    else {
                        IEEEAddress address = new IEEEAddress(command);
                        System.out.println("Query radio address = " + address.asDottedHex());
                    }
                    
                    String response = sendAndReceive(command);
                    System.out.println(response);
                    writer.write(response);
                    writer.newLine();
                    
                    writer.flush();
                    reader.close();
                    writer.close();
                    
                } catch(IOException exception) {
                    exception.printStackTrace();
                }
            }
        } catch(Exception exception) {
            exception.printStackTrace();
        }
        
        System.exit(0);
    }
    
    public synchronized String sendAndReceive(String request) {
        RadiogramConnection connection = null;
        String response = "";
        
        try {
            connection = (RadiogramConnection) Connector.open("radiogram://broadcast:10");
            connection.setTimeout(5000);
            Datagram datagram = connection.newDatagram(connection.getMaximumLength());
            datagram.writeUTF(request);
            connection.send(datagram);
            connection.close();
            
            connection = (RadiogramConnection) Connector.open("radiogram://:11");
            connection.setTimeout(5000);
            datagram = connection.newDatagram(connection.getMaximumLength());
            connection.receive(datagram);
            response = new Double(datagram.readDouble()).toString();
            connection.close();
            
            Utils.sleep(1000);
            
        } catch(Exception exception) {
            try {
                connection.close();
            }
            catch(IOException exception2) {}
            
            response = exception.getMessage();
        }
        
        return response;
    }
        
        /**
         * Main method.
         *
         * @param arguments the command line arguments.
         */
        public static void main(String[] args) {
            SunSpotHostApplication host = new SunSpotHostApplication();
            host.run();
        }
    }

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