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This project was created specifically to handle the low level services which are offered by the MARSSA backend.
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/**
 * Copyright 2012 MARSEC-XL International Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.marssa.services.communication;

import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;


import org.marssa.footprint.exceptions.ConfigurationError;
import org.marssa.footprint.logger.MMarker;
import org.slf4j.LoggerFactory;

import ch.qos.logback.classic.Logger;

/**
 * @author Warren Zahra
 * 
 */
public class SerialCommunication {
	/**
	 * 
	 */
	private static Logger logger = (Logger) LoggerFactory
			.getLogger(SerialCommunication.class.getName());
	InputStream in;
	OutputStream out;

	public SerialCommunication() {
		super();
	}

	public void connect(String portName, int baudrate, int dataBits,
			int stopBits, int parity) throws Exception {
		logger.info(MMarker.CONNECTION, "Connected with port {}.", portName);
		Object[] serialConnection = { baudrate, dataBits, stopBits, parity };
		logger.info(
				MMarker.CONSTRUCTOR,
				"Parameters for SerialPort are BaudRate{} . DataBits{} . StopBits {} . Parity {} .",
				serialConnection);

		CommPortIdentifier portIdentifier = CommPortIdentifier
				.getPortIdentifier(portName);
		if (portIdentifier.isCurrentlyOwned()) {
			logger.error("Port {}. is currently in use by another Device",
					portName);
		} else {
			CommPort commPort = portIdentifier.open(this.getClass().getName(),
					2000);

			if (commPort instanceof SerialPort) {
				SerialPort serialPort = (SerialPort) commPort;
				// serialPort.setSerialPortParams(baudrate,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);
				serialPort.setSerialPortParams(baudrate, dataBits, stopBits,
						parity);

				in = serialPort.getInputStream();
				out = serialPort.getOutputStream();
			} else {
				ConfigurationError e = new ConfigurationError(
						"Only serial ports are handled by this example");
				logger.error("Only serial ports are handled by this example", e);
				throw e;
			}
		}
	}

	public InputStream getInputStream() {
		logger.trace(MMarker.GETTER, "Returning InputStream  {} .", in);
		return in;
	}

	public void read(InputStream in) throws IOException {
		// TODO read should we show the string in the logger ????
		byte[] buffer = new byte[1024];
		int len = -1;
		try {
			while ((len = this.in.read(buffer)) > -1) {
				logger.trace("Input stream is" + new String(buffer, 0, len));
				System.out.print(new String(buffer, 0, len));
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public void write(String outputSerialSentence) {
		try {
			out.write(outputSerialSentence.getBytes());
			logger.trace("Sending {} . data to serial", outputSerialSentence);
			out.flush();
		} catch (IOException e) {
			// TODO exception handling
			logger.debug("IOException handling ", e);
		}
	}
}