BTSend.java

import lejos.pc.comm.*;
import java.io.*;

/**
 * This is a PC sample. It connects to the NXT, and then
 * sends an integer and waits for a reply, 100 times.
 * 
 * Compile this program with javac (not nxjc), and run it 
 * with java.
 * 
 * You need pccomm.jar and bluecove.jar on the CLASSPATH. 
 * On Linux, you will also need bluecove-gpl.jar on the CLASSPATH.
 * 
 * Run the program by:
 * 
 *   java BTSend 
 * 
 * Your NXT should be running a sample such as BTReceive or
 * SignalTest. Run the NXT program first until it is
 * waiting for a connection, and then run the PC program. 
 * 
 * @author Lawrie Griffiths
 *
 */
public class BTSend {	
	public static void main(String[] args) {
		NXTConnector conn = new NXTConnector();
		
		// Connect to any NXT over Bluetooth
		boolean connected = conn.connectTo("btspp://");
		
		if (!connected) {
			System.err.println("Failed to connect to any NXT");
			System.exit(1);
		}
		
		DataOutputStream dos = conn.getDataOut();
		DataInputStream dis = conn.getDataIn();
				
		for(int i=0;i<100;i++) {
			try {
				System.out.println("Sending " + (i*30000));
				dos.writeInt((i*30000));
				dos.flush();			
				
			} catch (IOException ioe) {
				System.out.println("IO Exception writing bytes:");
				System.out.println(ioe.getMessage());
				break;
			}
			
			try {
				System.out.println("Received " + dis.readInt());
			} catch (IOException ioe) {
				System.out.println("IO Exception reading bytes:");
				System.out.println(ioe.getMessage());
				break;
			}
		}
		
		try {
			dis.close();
			dos.close();
			conn.close();
		} catch (IOException ioe) {
			System.out.println("IOException closing connection:");
			System.out.println(ioe.getMessage());
		}
	}
}