Hi
I have a problem in connecting modem with another modem through PSTN. i want the solution in java code

i want this connection to upload file from remote pc to my local pc

i want to develope the whole application in java

plz help me out as early as possible : :-|

You should really give us a more specific descripition of your needs, but overall this question sounds more suited to the Java programming forum.

Moving there now...

hi
i have connected two pcs using modem via PSTN using comm api in follwing sequences.

1) My local modem calls to the Remote modem using the ATDT 235 command
2) on remote side one program continuosly listens to the incoming call.
3) After that my local modem detects the "CONNECT 9600" response.
4) Also my remote modem detects the same response it waits for some time and start transmitting data.
5) But my local modem is unable to receive some starting bytes and after some bytes it has receive it stops the receiving bytes.
6) But when i terminate the remote program my local modem receives the whole set of bytes.

Remote modem - DLINK DFM-562E++
Local Modem - DLINK DFM-560ES

THANKS IN ADVANCE

This is my Dialup.java running at server side

import java.io.*;
import java.util.*;
import javax.comm.*;

public class Dialup implements Runnable,SerialPortEventListener 
{

	static CommPortIdentifier portId;
	static Enumeration portList;

	InputStream inputStream;
	OutputStream outputStream;
	SerialPort serialPort;
	Thread dialupThread;
	String telNo;
	String dialCommand;
	String initCommand;
	String line;
	static BufferedReader bos;
	static OutputStream fos = null;
	static FileOutputStream output = null;
	static DataOutputStream dOut = null;
	boolean flag = false;
	int conCount = 0;

	public static void main(String[] args) 
	{
		try
		{
			fos = new FileOutputStream("dem.txt",true);
			bos = new BufferedReader(new FileReader("dem.txt"));
			output = new FileOutputStream("abc.txt",true);
			dOut = new DataOutputStream(output);
		}catch(Exception e)
		{}

		if( args.length != 1 ) 
		{
			System.err.println("Usage: Dialup ");
			return;
		}
		portList = CommPortIdentifier.getPortIdentifiers();

		while (portList.hasMoreElements()) 
		{
			portId = (CommPortIdentifier) portList.nextElement();
			if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) 
			{
				if (portId.getName().equals("COM1")) 
				{
					Dialup dialer = new Dialup(args[0]);
				}
			}
		}

	}

	public Dialup(String telNo) 
	{
//		this.dialCommand = "&F&K3%E2%C0W2\\N3+MS=12,1,28000,46667";
		this.telNo = telNo;
		this.dialCommand = "ATDT"+telNo+"\r";
		initCommand = "&F&K3%E2%C0W2\\N3+MS=12,1,28000,46667\r";
//		this.dialCommand = "AT&C0&W0\r";
//		this.dialCommand = "ATO0";
//		this.dialCommand = "ATO0";
		try 
		{
			serialPort = (SerialPort) portId.open("DialUp", 2000);
		}
		catch (PortInUseException e) 
		{
		}

		try 
		{
			inputStream = serialPort.getInputStream();
			outputStream = serialPort.getOutputStream();
		}
		catch (IOException e) 
		{
			System.out.println(" Hell " + e);
		}

		try 
		{
			serialPort.addEventListener(this);
		}
		catch (TooManyListenersException e) {
		}
	
	
	portList = CommPortIdentifier.getPortIdentifiers();
		while (portList.hasMoreElements()) 
		{
			portId = (CommPortIdentifier) portList.nextElement();

			if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) 
			{

				if (portId.getName().equals("COM1")) 
				{
//					System.out.println(getInputBufferSize());
//					try 
//					{
						//serialPort = (SerialPort) portId.open("writereadApp", 2100);
						//System.out.println("Opened the port for writing: " + portId.getName());
//					}
//					catch (PortInUseException e) {System.out.println("IN USE ----  " + e);}			

					try 
					{
						serialPort.setSerialPortParams(9600,
						SerialPort.DATABITS_8,
						SerialPort.STOPBITS_1,
						SerialPort.PARITY_NONE);
					}
					catch (UnsupportedCommOperationException e) 
						{
							System.out.println("UnsupportedCommOperationException, Could not write to the port: " + e);
						}
					try 
					{
						outputStream = serialPort.getOutputStream();
						inputStream = serialPort.getInputStream();
					} 
					catch (IOException e) {System.out.print(e);}

/*					try 
					{
						serialPort.addEventListener(this);
					} 
					catch (TooManyListenersException e) {System.out.println("TOOO " + e);}
*/
					serialPort.notifyOnDataAvailable(true);
					serialPort.notifyOnCarrierDetect(true);
					serialPort.notifyOnDataAvailable(true);
					serialPort.notifyOnBreakInterrupt(true);
					serialPort.notifyOnCTS(true);
					serialPort.notifyOnDSR(true);
					serialPort.notifyOnFramingError(true);
					serialPort.notifyOnOutputEmpty(true);
					serialPort.notifyOnOverrunError(true);
					serialPort.notifyOnParityError(true);
					serialPort.notifyOnRingIndicator(true);
				}

			}
		}
		dialupThread = new Thread(this);
		dialupThread.start();
	}

	public void run() 
	{
		while(true)
		{
			if(conCount == 0) 
			{
				try 
				{
					if( !serialPort.isCD() ) 
					{
	//					outputStream.write(initCommand.getBytes());
						System.err.println("Try to connect ...");
						outputStream.write(dialCommand.getBytes());
					}
					Thread.sleep(60000);
					/*for(int i=0; i < 10; i++)
					{
						outputStream.write("Ram".getBytes());
						System.out.print("Ram");
					}*/
				}
				catch(Exception ex) 
				{
					System.err.println("Failed to write message");
				}
			}
		}
	}

	public void serialEvent(SerialPortEvent event) 
	{
	switch(event.getEventType()) 
	{
		case SerialPortEvent.OE:
		case SerialPortEvent.FE:
		case SerialPortEvent.PE:
		case SerialPortEvent.DSR:
			System.out.println("Data Set Ready.");
			break;
		case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
			System.out.println("Ignored event");
			break;

		case SerialPortEvent.BI:
			System.out.println("Break Interrupt");
			break;

		case SerialPortEvent.CTS:
			System.out.println("Clear to send");
			break;


		case SerialPortEvent.RI:
			if( event.getNewValue() ) 
			{
				System.out.println("Ring Indicator On");
			}
			else 
			{
				System.out.println("Ring Indicator Off");
			}
			break;

		case SerialPortEvent.CD:
			if( event.getNewValue() ) 
			{
				System.out.println("Connected");
				conCount = conCount + 1;
				flag = true;
			}
			else 
			{
				System.out.println("Disconnected");
			}
			break;

		case SerialPortEvent.DATA_AVAILABLE:
			handleData();	
			break;
		}
	}

	public void handleData()
	{
		try
		{
			int avail = inputStream.available();
			byte[] response = new byte[avail];
			StringBuffer strbuf = new StringBuffer();
			inputStream.read(response, 0, avail);
			for (int i = 0; i < avail; i++) 
			{
				if(!flag)
				{
					fos.write((char)response[i]);
				}
			}
/*						while((line = bos.readLine())!=null)
			{
				if(line.equals("CONNECT 9600"))
				{
					flag = true;
					dOut.flush();								
				}
			}
*/			if(flag)
			{
				inputStream.read(response, 0, avail);
				for (int i = 0; i < avail; i++) 
				{
					Thread.sleep(5);
					output.write((char)response[i]);
					System.out.print((char)response[i]);
				}
			}
		}catch(IOException ie1){System.out.println("File " +ie1);}
		catch(InterruptedException in){System.out.println("Interrupt " +in);}

	}
}

this is my client side code

import java.io.*;
import java.util.*;
import javax.comm.*;
public class ReadDemo1 implements SerialPortEventListener 
{
	static Enumeration portList;
	static CommPortIdentifier portId; 
	static String output = "";
	SerialPort serialPort;
	static OutputStream outputStream;
	static InputStream inputStream;
	static String dialCommand;
	Thread readThread;
	int temp = 0;

	//*************************
	StringBuffer inputBuffer = new StringBuffer();
	DataOutputStream dout = null;
	OutputStream fos = null;
	String line;
	int ch;
	BufferedReader bos = null;
	int newData = 0;
	boolean writeFlag = false;
	FileInputStream fis = null;

	public static void main(String[] args)
	{


		int ch;
		InputStream fis;
		byte[] size = null;
		int count = 0;

		ReadDemo1 readObject = new ReadDemo1();
/*		try
		{
//			outputStream.write("ATM0L1S0=1&D2&C1S2=36S95=46&Q5\r".getBytes());
			outputStream.write("AT\\K0\r".getBytes());
		}catch(IOException ioe)
		{
			System.out.println("IOException" + ioe);
		}
*/
	}

	void Write(byte[] commandToSend)
	{
	try 
	{
		outputStream.write(commandToSend);
		System.out.println("Successfully Written: " + commandToSend);
	} 
	catch (IOException e) {System.out.println("IO Exception Occured: " + e);}
}
void closePort() 
{
	serialPort.close();
	System.out.print("Serial port closed.");
}


public ReadDemo1() 
{

	portList = CommPortIdentifier.getPortIdentifiers();
	while (portList.hasMoreElements()) 
	{
		portId = (CommPortIdentifier) portList.nextElement();

		if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) 
		{

			if (portId.getName().equals("COM1")) 
			{
				try 
				{
					serialPort = (SerialPort) portId.open("writereadApp", 2000);
					System.out.println("Opened the port for writing: " + portId.getName());
				}
				catch (PortInUseException e) {System.out.print(e);}			

				try 
				{
					serialPort.setSerialPortParams(9600,
					SerialPort.DATABITS_8,
					SerialPort.STOPBITS_1,
					SerialPort.PARITY_NONE);
				}
				catch (UnsupportedCommOperationException e) {System.out.println("UnsupportedCommOperationException, Could not write to the port: " + e);}
				try 
				{
					outputStream = serialPort.getOutputStream();
					inputStream = serialPort.getInputStream();
				} 
				catch (IOException e) {System.out.print(e);}

				try 
				{
					serialPort.addEventListener(this);
				} 
				catch (TooManyListenersException e) {System.out.print(e);}

				serialPort.notifyOnDataAvailable(true);
				serialPort.notifyOnCarrierDetect(true);
				serialPort.notifyOnDataAvailable(true);
				serialPort.notifyOnBreakInterrupt(true);
				serialPort.notifyOnCTS(true);
				serialPort.notifyOnDSR(true);
				serialPort.notifyOnFramingError(true);
				serialPort.notifyOnOutputEmpty(true);
				serialPort.notifyOnOverrunError(true);
				serialPort.notifyOnParityError(true);
				serialPort.notifyOnRingIndicator(true);
			}
		}
	}
}


	
	public void serialEvent(SerialPortEvent event) 
	{
		switch(event.getEventType()) 
		{
			case SerialPortEvent.DATA_AVAILABLE:
				handleData();	
				break;
			case SerialPortEvent.OE:
			case SerialPortEvent.FE:
			case SerialPortEvent.PE:
			case SerialPortEvent.DSR:
				System.out.println("Data set ready.");
				break;
			case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
				System.out.println("Ignored event");
				break;
			case SerialPortEvent.BI:
				System.out.println("Break Interrupt");
				break;
			case SerialPortEvent.CTS:
				System.out.println("Clear to send");
				break;
			case SerialPortEvent.RI:
				System.out.println("Pick up the receiver.");
				if( event.getNewValue() ) 
				{
					System.out.println("Ring Indicator On");
				}
				else 
				{
					System.out.println("Ring Indicator Off");
				}
				break;
			case SerialPortEvent.CD:
				if( event.getNewValue() ) 
				{
					System.out.println("Connected");
					try
					{
						Thread.sleep(120000);
						while((ch = fis.read()) != -1)
						{
							outputStream.write(ch);
		//								Thread.sleep(15);
							System.out.print((char)ch);
						}
										
						Thread.sleep(180000);					
					}catch(Exception e)
					{
						System.out.println(e);
					}
				}
				else 
				{
					System.out.println("Disconnected");
					System.exit(0);
				}
				break;
		}
	}
	public void handleData()
	{
//		System.out.println(writeFlag);
		System.out.print("Inside serial event");
		try
		{
			fis = new FileInputStream("abc.txt");
		}catch(FileNotFoundException fne) 
		{
			System.out.println("File Does not exists.");
		}
		try
		{
			fos = new FileOutputStream("rmn.txt",true);
			bos = new BufferedReader(new FileReader("rmn.txt"));
			dout = new DataOutputStream(fos);
			int avail = inputStream.available();
			byte[] response = new byte[avail];
			StringBuffer strbuf = new StringBuffer();
			inputStream.read(response, 0, avail);
			for (int i = 0; i < avail; i++) 
			{
				fos.write((char)response[i]);
			}
			if(!writeFlag)
			{
				while((line = bos.readLine())!=null)
				{
				//	dout.flush();
					if(line.equals("CONNECT 9600/ARQ"))
					{
						writeFlag = true;
						System.out.println("connect");
					}
				}
			}
			if(writeFlag)
			{

			}
		}catch(IOException ie1){System.out.println("File " +ie1);}
//		catch(InterruptedException ie1){System.out.println("File " +ie1);}
	}
}

Like I suspected you're not flushing any of your Streams, that's BAD.
I've not checked if you're properly closing them, look for that as well.

hi
can u plz tell me the sequence in which after the modem get connected i should flush the streams while transferring data from one end to other.

Modem stop receiving bytes after the follwing events
Data set Ready
Break Interrupt

hi
can u plz tell me the sequence in which after the modem get connected i should flush the streams while transferring data from one end to other.

Modem stop receiving bytes after the follwing events
Data set Ready
Break Interrupt

hi,

did you have any luck finding the problem? (i've looked over the code, but i'm not familiar enough with javax.comm to find anything new)

hi
I have problem into program previous.
I can connection between two pc with modem using program
previous but , I cannot upload file from pc to pc

please necessary

Hi nawal,


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