Using atmodem4j with rxtx on the same machine

1. Setup rxtx port (19200 bit/s, 8 bit data 1 stop bit, no parity, DTR/RST on

   //replace string with actual com port on Windows "COM1" or similar.
   CommPortIdentifier portId = CommPortIdentifier.getPortIdentifier("/dev/ttyUSB0");
   
   // Open the port represented by the CommPortIdentifier object. Give
   // the open call a relatively long timeout of 30 seconds to allow
   // a different application to reliquish the port if the user
   // wants to.
   SerialPort sPort = (SerialPort) portId.open(Modem.class.getName(), 30000);
   sPort.setSerialPortParams(19200, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
   sPort.enableReceiveTimeout(1000);
   sPort.setDTR(true);
   sPort.setRTS(true);
   sPort.setFlowControlMode(SerialPort.FLOWCONTROL_RTSCTS_IN | SerialPort.FLOWCONTROL_RTSCTS_OUT);

2. Create Modem instance and connect rxtx with that instance

   ItuV250Modem atModem = new ModemFactory().getAtV250Modem(false, false, false, true);
   atModem.setModemInputStream(sPort.getInputStream());
   atModem.setModemOutputStream(sPort.getOutputStream());

3. Work with te modem

   //make a call and get a connection
   Connection conn = atModem.dial("9876543210");
   // setup receiver tread which puts out received data
   Thread t = new Thread(new Runnable() {
       final InputStream is = conn.getInputStream();
       public void run() {
           while (true) {
               try {
                   int i = is.read();
                   if (i == -1) {
                       System.err.println("Console Printer Cancelled");
                       break;
                   } else {
                       System.out.print((char) i);
                   }
               } catch (IOException ex) {
                   System.err.println("Console Printer ERROR");
               }
           }
       }
   });
   t.setDaemon(true);
   t.start();
   
   //send some data
   conn.getOutputStream().write("Hello world\r\n".getBytes());
   //close the connection, disconnect the call
   conn.close();

4. Close the modem and the serial port

       atModem.setRxtxTimeoutEnabled(false);
       sPort.close();