I need to send a command from an android phone, via wifi, to a router, through a wire, to a "cable box" <--- just assume cable box for now. When sending the command from my laptop, I get a nice healthy flood of data on my wireshark reading. Also, the cable box responds and does what it is told. However, as soon as I try to put the App on my phone and use it, nothing happens. If I send the command from my phone to my computer I get 2 empty packets sent back and forth between my phone and computer. What am I doing wrong here? I've been struggling with this for 3 days now.
import android.util.Log;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.util.ArrayList;
public class TCPRunnable implements Runnable{
private final String ip;
private final int port;
private final ArrayList<String> commands;
//<editor-fold defaultstate="collapsed" desc="Constructors">
@Deprecated
public TCPRunnable(String ip,int port,ArrayList<String> Cmds){
this.ip=ip;
this.port=port;
this.commands = Cmds;
}
public TCPRunnable(String ip,int port,String Cmd){
this.ip=ip;
this.port=port;
this.commands = new ArrayList<String>();
this.commands.add(Cmd);
}
//</editor-fold>
//<editor-fold defaultstate="collapsed" desc="Static Properties">
//</editor-fold>
//<editor-fold defaultstate="collapsed" desc="Instance Properties">
//</editor-fold>
public void run() {
try {
InetAddress serverAddr = InetAddress.getByName(this.ip);
SocketAddress socketadd= new InetSocketAddress(serverAddr,port);
Log.d("TCP","R: Making the socket.");
Socket socket = new Socket();
//new Socket();//
Log.d("TCP","R: Connecting...");
socket.connect(socketadd, 1500);
// PrintWriter out = new PrintWriter (new BufferedWriter( new OutputStreamWriter(socket.getOutputStream())),true);
InputStream socketReader = socket.getInputStream();
OutputStream socketWriter = socket.getOutputStream();
try {
for (int i = 0; i < commands.size();i++){
String Cmd = commands.get(i);
Log.d("TCP","R: Sending: '"+Cmd+"'");
byte [] iByte;
byte[] oByte = new byte[100];//in 32 bit signed integers
int CmdLen = 0;
CmdLen = commands.get(i).length();
oByte[0] = (byte) Integer.parseInt("AF", 16);
oByte[1] = (byte) Integer.parseInt("FA", 16);
oByte[2] = (byte) Integer.parseInt("F0", 16);
oByte[3] = (byte) (255-oByte[2]);
oByte[4] = (byte) (Cmd.length() +2);
oByte[5] = (byte) (255-oByte[4]);
oByte[6] = (byte) Integer.parseInt("07", 16);
iByte = Cmd.getBytes();
System.arraycopy(iByte, 0, oByte, 7, Cmd.length());
oByte[7+CmdLen] = (byte) Integer.parseInt("00",16);
oByte[8+CmdLen] = (byte) Integer.parseInt("00",16);
Object [] data = new Object [3];
data[0]=oByte;
data[1]=0;
data[2]=(9 + CmdLen);
//ping(IP,PORT);
//disconnect();
//connect();
socketWriter.write((byte[])data[0],(Integer)data[1],(Integer)data[2]);
socketWriter.flush();
Log.d("TCP","R: Sent.");
//Thread.sleep(500L);
}
}catch (Exception ex){
Log.e("TCP", "S: Sending failed: "+ex);
}finally{
socketWriter.flush();
socketWriter.close();
socket.close();
Log.d("TCP","R: Done.");
}
} catch (IOException ex) {
Log.e("IOEXCEPTION",""+ex);
}
}
//<editor-fold defaultstate="collapsed" desc="Static Methods">
//</editor-fold>
//<editor-fold defaultstate="collapsed" desc="Instance Methods">
//</editor-fold>
//<editor-fold defaultstate="collapsed" desc="Accessors">
//</editor-fold>
}
Edit: I still can't send data. but at least I know why 'no data is sent' now. It was because I was sending data to a laptop and not the machine itself. Second Edit where my code comments out //sleep(500L);, It should be uncommented. Otherwise you send data too quickly to receive a response.
