Accessing Remote Gateway

ManxAnts · by **ManxAnts** » Wed Jul 18, 2012 10:50 am

Hi

I am fairly new to Java and am having a problem trying to access a remote Gateway as it only accepts hex values and responds with hex. I have been working with Sockets, and can see, using Wireshark that my values are being sent as individual ascii values, rather than as hex characters. I have tried a variety of alternatives such as bigint, and char arrays, but can't get a sensible solution.

This is what I have :

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// package bdn;
/*  The java.net package contains the basics needed for network operations. */
import java.net.*;
/* The java.io package contains the basics needed for IO operations. */
import java.io.*;
/** The SocketClient class is a simple example of a TCP/IP Socket Client.
 * For a detailed explanation of the classes in this project see
 * http://bdn.borland.com/article/0,1410,31995,00.html
 */
 
public class SocketClient {
 
  public static void main(String[] args) {
    /** Define a host server */
    String host = "192.168.1.186";
    /** Define a port */
    int port = 3376;
    int i = 0;
 
    StringBuffer instr = new StringBuffer();
//    String TimeStamp;
    System.out.println("SocketClient initialized to " + host + ", port " + port );
 
    try {
      /** Obtain an address object of the server */
      InetAddress address = InetAddress.getByName(host);
      /** Establish a socket connection */
      Socket connection = new Socket(address, port);
      /** Instantiate a BufferedOutputStream object */
      BufferedOutputStream bos = new BufferedOutputStream(connection.
          getOutputStream());
 
      /** Instantiate an OutputStreamWriter object with the optional character
       * encoding.
       */
      OutputStreamWriter osw = new OutputStreamWriter(bos, "US-ASCII");
 
//      TimeStamp = new java.util.Date().toString();
      String process = "0x308101000c00234C51050000000099670007";
      
      System.out.println("Data to be sent is " + process) ;
      
      /** Write across the socket connection and flush the buffer */
      osw.write(process);
      osw.flush();
      
      System.out.println("Data sent is " + process) ;
 
      /** Instantiate a BufferedInputStream object for reading
       * incoming socket streams.
       */
 
      BufferedInputStream bis = new BufferedInputStream(connection.
          getInputStream());
      /**Instantiate an InputStreamReader with the optional
       * character encoding.
       */
 
      InputStreamReader isr = new InputStreamReader(bis, "US-ASCII");
 
      /**Read the socket's InputStream and append to a StringBuffer */
      int c;
      for (i = 0;  i <= 18; i++ ) { 
          c = isr.read() ;
          instr.append((char) c);
          System.out.println("character " + i + " value " + c);
    }
   
      /** Close the socket connection. */
      connection.close();
      System.out.println(instr);
     }
    catch (IOException f) {
      System.out.println("IOException: " + f);
    }
    catch (Exception g) {
      System.out.println("Exception: " + g);
    }
  }
}
 
Parsed in 0.039 seconds,  using GeSHi 1.0.8.4

I get the impression from various forums that sending hex is a problem. I can not change the Gateway in anyway, so any help would be most welcome to code it from the Android side. - Thanks

Accessing Remote Gateway

Accessing Remote Gateway

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