CODEWITHSUNDEEP
socketsandroid-emulator
yoshibluehaha
yoshibluehaha

Reputation: 13

Android App: Address Family not Supported by Protocol

I am trying to have my Android application sent Telnet commands over a small network to another device, and whenever I declare the DatagramSocket it throws a SocketException saying: Address Family not Supported by Protocol. Here is my code below:

    try {
        addr = InetAddress.getByName(ipAddress);
        sock = new DatagramSocket();  //SocketException created here

        //first message - cmd
        length = cmd.length();
        message = cmd.getBytes();
        packet = new DatagramPacket(message, length, addr, portAddr);
        sock.send(packet);

        //second message - highCMD
        length = highCMD.length();
        message = highCMD.getBytes();
        packet = new DatagramPacket(message, length, addr, portAddr);
        sock.send(packet);

        sock.close();

    } catch (SocketException e) {
        AlertDialog alertDialog;
        alertDialog = new AlertDialog.Builder(v.getContext()).create();
        alertDialog.setTitle("Send High CMD Error!");
        alertDialog.setMessage("SocketException");
        alertDialog.show();
    } catch (IOException e){
        AlertDialog alertDialog;
        alertDialog = new AlertDialog.Builder(v.getContext()).create();
        alertDialog.setTitle("Send High CMD Error!");
        alertDialog.setMessage("IOException");
        alertDialog.show();
    }
}

Possible solutions I've considered but haven't made work:

  1. Emulator needs port redirect through development machine, which ports to use?
  2. I'm not using correct version of IP4/6, how is this set?
  3. Device uses TCP protocol, maybe I'm using the wrong socket type?

Other Important Info:

  1. I've only run this on an Emulator
  2. Development Machine correctly sent telnet commands from Command Prompt
  3. Network consists of development machine, router, and device.

UPDATE: 2/9/11

I've changed this code to the following, but I'm still getting an exception:

    try {
        addr = InetAddress.getByName(ipAddress);
        socketAddress = new InetSocketAddress(addr, portAddr);

        sock = new Socket();
        sock.connect(socketAddress);
        sock.close();

    } catch (SocketException e) {
        AlertDialog alertDialog;
        alertDialog = new AlertDialog.Builder(v.getContext()).create();
        alertDialog.setTitle("Send High CMD Error!");
        alertDialog.setMessage("SocketException" + e.getMessage());
        alertDialog.show();
    }

The message from the exception says "Permission Denied." Does this mean that my device is blocking the socket from connecting?

Upvotes: 1

Views: 7514

Answers (1)

Chris Stratton
Chris Stratton

Reputation: 40367

You've coded this the wrong way. Telnet uses TCP which uses stream (connection oriented) sockets, not the datagram sockets used by UDP.

Search for tcp examples.

Upvotes: 3

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