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  UDP Packets over LAN  (Read 3263 times)
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Offline Zarkopafilis

Senior Newbie





« Posted 2014-03-01 15:44:34 »

I am actually trying to make a game that is played on a pc , controlled by an android tablet. UDP Packets from the android device (ma nexus 7) never reach the PC . Here is the code. Im so fcking mad btw....
Android:
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final int bn = b.num;
Log.i(tag, "creating");
Thread t = new Thread(){

@Override
public void run(){
    try {
        sendPacket(bn);
    } catch (SocketException e) {
        e.printStackTrace();
    } catch (UnknownHostException e) {
        e.printStackTrace();
    }
}

private void sendPacket(int i) throws SocketException, UnknownHostException{
    Log.i(tag, "creating buffer");
     String t = ""+1;
     byte[] buf = t.getBytes();
     Log.i(tag, "creating address");
     InetAddress ip = InetAddress.getByName(Dataholder.ip);
     Log.i(tag, "creating socket");//EADDRNOTAVAIL error here
     DatagramSocket s = new DatagramSocket(port , ip);
     Log.i(tag, "creating packet");
     DatagramPacket p = new DatagramPacket(buf , buf.length, ip,port);

     try {
         Log.i(tag, "sending");                      
         s.send(p);
    } catch (IOException e) {
    }finally{
        s.close();
    }
 }

};
Log.i(tag, "running");
t.run();`


PC:
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byte[] data = new byte[1];//I only send 1 digit integers

@SuppressWarnings("resource")//nevermind closing the socket :D
DatagramSocket s = new DatagramSocket(4442);
DatagramPacket p = new DatagramPacket(data, data.length);

System.out.println("Now monitoring...");

while(true){

    s.receive(p);
    System.out.println("Button Pressed! --> "+new             String(p.getData(),0,p.getData().length));//this works the best (I tested it myself)
}


It just stays at monitoring stage^

I am using the port 4442 on both of the machines. Also , the IP that is used on the android part is this one:
http://prntscr.com/2wwjiy
Offline jonjava
« Reply #1 - Posted 2014-03-01 18:51:31 »

Dataholder.ip?

Offline Zarkopafilis

Senior Newbie





« Reply #2 - Posted 2014-03-04 20:00:17 »

Dataholder.ip?

Take a loop at the link I provided on the bottom of the first post!
Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline jonjava
« Reply #3 - Posted 2014-03-04 20:24:27 »

I did.

Offline delt0r

JGO Knight


Medals: 30
Exp: 18 years


Computers can do that?


« Reply #4 - Posted 2014-03-06 10:59:14 »

Start with TCP. Only move to UDP if you really need it. Which i doubt you do.

Then use something like tcpdump to inspect packets and see if your are in fact sending packets you expect and double check that ip address are right or that your not trying to go across subnet boundaries etc. ie can you ftp/ssh between these devices.

I have no special talents. I am only passionately curious.--Albert Einstein
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