// Hardware dependant methods for the communication with the mobile phone over serial line//// file:    Port.java// used by: Msg.java//// For comments see header of SMS.java.//---------------------------------------------------------------------------------------package smspack;import java.io.*;import java.rmi.*;import java.util.*;import javax.comm.*;class Port {  private static String portName;  private static SerialPort port;  private static OutputStreamWriter out;  private static InputStreamReader in;  private static String number;  private static String message;  private static boolean numbertype;       // national or international dialing number  /** open the connection via the serial line  * @throws Exception  */  public static void open() throws Exception {    //----- open the connection via the serial line    try {      CommPortIdentifier portId = CommPortIdentifier.getPortIdentifier(SMS.COMPORT);      port = (SerialPort)portId.open("SMS Transceiver", 10);  // open port      // set parameter for serial port      port.setSerialPortParams(19200, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);      out = new OutputStreamWriter(port.getOutputStream(), "ISO-8859-1");      in = new InputStreamReader(port.getInputStream(), "ISO-8859-1");      System.out.println("open port\n");    // for debugging    } // try    catch (Exception e) {      SMS.showText("could not open port:" + e);      System.exit(0);    } // catch  } // open  /** sends an AT command to ME and receives the answer of the ME   * @param atcommand AT command for the mobile phone   * @return  answer string of the ME   * @throws java.rmi.RemoteException   */  public static String sendAT(String atcommand) throws java.rmi.RemoteException {    String s="";    try {      Thread.sleep(300);    // wait 300 msec [Timing]      writeln(atcommand);   // send AT command to ME      Thread.sleep(300);    // wait 300 msec [Timing]      s = read();           // get response from ME      Thread.sleep(300);    // wait 300 msec [Timing]    } // try    catch (Exception e) {      SMS.showText("ERROR: send AT command failed; " + "Command: " + atcommand + "; Answer: " + s + "  " + e);    } // catch    return s;  }  // sendAT /** write a string to the output buffer  *  @param s string for the serial output buffer  *  @throws Exception  */  public static void write(String s) throws Exception {    out.write(s);    out.flush();  }  // write  /** write a character to the output buffer   *  @param s character for the serial output buffer   *  @throws Exception   */  public static void write(char[] s) throws Exception {    out.write(s);    out.flush();  }  // write /** write a string with CR at the end to the output buffer  *  @param s string for the serial output buffer  *  @throws  Exception  */  public static void writeln(String s) throws Exception {    out.write(s);    out.write('\r');    out.flush();    System.out.println("write port: " + s + "\n");    // for debugging  }  // writeln  /** receives a character string from the serial line    * @return  received character string from ME    * @throws Exception    * Remark: Some mobile phones don't send one byte immediate after the other    *         byte to the PC. Thus it is necessary to check (about) 5 times after    *         a delay that all bytes are received. It is also important to collect    *         the bytes not too fast, because this can result in some lost bytes.    */  public static String read() throws Exception {    int n, i;    char c;    String answer = new String("");   // do {                              // wait until the first byte is received   //   Thread.sleep(100);              // wait at least 100 msec [Timing]  //  } while (in.ready() == false);    for (i = 0; i < 10; i++) {         // look 5 times for character string to receive      //----- collect all characters from the serial line      while (in.ready()) {            // there is a byte available        n = in.read();                // get the byte from the serial line        if (n != -1) {                // one byte received          c = (char)n;                // convert the received integer to a character          answer = answer + c;        // collect the characters from the serial line          Thread.sleep(1);            // wait 1 msec between every collected byte from the mobile phone [Timing]        } // if        else break;                   // no more bytes available      } // while      Thread.sleep(100);              // wait 100 msec [Timing]    }  // for    System.out.println("read port: " + answer + "\n");    // for debugging    return answer;                    // give the received string back to the caller  } // read  /** close the connection via the serial line   * @throws Exception   */  public static void close() throws Exception {    try {      port.close();      System.out.println("close port\n");    // for debugging    } // try    catch (Exception e) {      SMS.showText("Error: close port failed: " + e);    } // catch  } // close} // Port