Java Code Examples for java.net.datagramsocket#setSoTimeout()

public static PortBean.PortNetBean scanAddress(InetAddress ia, int portNo, int timeoutMillis) {
    PortBean.PortNetBean portNetBean = new PortBean.PortNetBean();
    Long time = System.currentTimeMillis();
    try {
        byte[] bytes = new byte[128];
        DatagramPacket dp = new DatagramPacket(bytes, bytes.length);

        DatagramSocket ds = new DatagramSocket();
        ds.setSoTimeout(timeoutMillis);
        ds.connect(ia, portNo);
        ds.send(dp);
        ds.isConnected();
        ds.receive(dp);
        ds.close();
        portNetBean.setConnected(true);
    } catch (SocketTimeoutException e) {

    } catch (Exception ignore) {

    }
    portNetBean.setPort(portNo);
    portNetBean.setDelay(System.currentTimeMillis() - time);
    return portNetBean;
}
 

private DatagramSocket createSocket0(int receiveBufferSize) {
    try {
        DatagramSocket socket = new DatagramSocket(null);
        socket.setReceiveBufferSize(receiveBufferSize);
        if (logger.isWarnEnabled()) {
            final int checkReceiveBufferSize = socket.getReceiveBufferSize();
            if (receiveBufferSize != checkReceiveBufferSize) {
                logger.warn("DatagramSocket.setReceiveBufferSize() error. {}!={}", receiveBufferSize, checkReceiveBufferSize);
            }
        }
        socket.setSoTimeout(1000 * 5);
        return socket;
    } catch (SocketException ex) {
        throw new RuntimeException("Socket create Fail. Caused:" + ex.getMessage(), ex);
    }
}
 

/**
 * Test of read method, of class UDPInputStream.
 */
public void testRead() throws Exception {
    System.out.println("read");
    DatagramSocketEmulator emul = new DatagramSocketEmulator();
    DatagramSocket sock = emul;
    sock.setSoTimeout(100);
    UDPInputStream instance = new UDPInputStream(sock);

    emul.setDatagramToReceive(new DatagramPacket("\r\n".getBytes(), 1));
    int expResult = '\r';
    int result = instance.read();
    assertEquals(expResult, result);

    int expResult2 = '\n';
    int result2 = instance.read();
    assertEquals(expResult2, result2);

    int expResult3 = ' ';
    emul.setDatagramToReceive(new DatagramPacket(" ".getBytes(), 1));
    int result3 = instance.read();
    assertEquals(expResult3, result3);
}
 

/**
 * Send a Wake-On-Lan packet
 *
 * @param address       - InetAddress to send wol packet to
 * @param macStr        - MAC address to wake up
 * @param port          - port to send packet to
 * @param timeoutMillis - timeout (millis)
 * @param packets       - number of packets to send
 *
 * @throws IllegalArgumentException - invalid ip or mac
 * @throws IOException - error sending packet
 */
public static void sendWakeOnLan(final InetAddress address, final String macStr, final int port, final int timeoutMillis, final int packets) throws IllegalArgumentException, IOException {
    if (address == null) throw new IllegalArgumentException("Address cannot be null");
    if (macStr == null) throw new IllegalArgumentException("MAC Address cannot be null");
    if (port <= 0 || port > 65535) throw new IllegalArgumentException("Invalid port " + port);
    if (packets <= 0)
        throw new IllegalArgumentException("Invalid number of packets to send " + packets);

    byte[] macBytes = MACTools.getMacBytes(macStr);
    byte[] bytes = new byte[6 + 16 * macBytes.length];
    for (int i = 0; i < 6; i++) {
        bytes[i] = (byte) 0xff;
    }
    for (int i = 6; i < bytes.length; i += macBytes.length) {
        System.arraycopy(macBytes, 0, bytes, i, macBytes.length);
    }

    DatagramPacket packet = new DatagramPacket(bytes, bytes.length, address, port);

    // Wake on lan is unreliable so best to send the packet a few times
    for (int i = 0; i < packets; i++) {
        DatagramSocket socket = new DatagramSocket();

        socket.setSoTimeout(timeoutMillis);

        socket.send(packet);
        socket.close();
    }
}
 

private String readBroadcastReply(DatagramSocket broadcastSocket, int timeoutInMs) throws IOException {
    byte[] replyBuffer = new byte[URL_MAX_LENGTH];
    DatagramPacket replyPacket = new DatagramPacket(replyBuffer, replyBuffer.length);
    broadcastSocket.setSoTimeout(timeoutInMs);
    broadcastSocket.receive(replyPacket);

    if (replyPacket.getLength() > 0) {
        return new String(replyPacket.getData(), 0, replyPacket.getLength(), BROADCAST_ENCODING);
    } else {
        throw new IllegalStateException("Could not retrieve URL using broadcast discovery, received a malformed packet from " +
                                        replyPacket.getAddress());
    }
}
 

/**
 * タイムアウトをセット, 0ならタイムアウトなし
 * @param timeout [ミリ秒]
 * @throws SocketException
 */
public void setSoTimeout(final int timeout) throws SocketException {
	final DatagramSocket socket = channel != null ? channel.socket() : null;
	if (socket != null) {
		socket.setSoTimeout(timeout);
	}
}
 

/**
 * Tests that any header or footer in layout is sent.
 * @throws Exception if exception during test.
 */
public void testLayoutHeader() throws Exception {
    DatagramSocket ds = new DatagramSocket();
    ds.setSoTimeout(2000);

  SyslogAppender appender = new SyslogAppender();
  appender.setSyslogHost("localhost:" + ds.getLocalPort());
  appender.setName("name");
  appender.setHeader(false);
  HTMLLayout pl = new HTMLLayout();
  appender.setLayout(pl);
  appender.activateOptions();

  Logger l = Logger.getRootLogger();
  l.addAppender(appender);
  l.info("Hello, World");
  appender.close();
  String[] s = new String[3];
  byte[] buf = new byte[1000];
  for(int i = 0; i < 3; i++) {
      DatagramPacket p = new DatagramPacket(buf, 0, buf.length);
      ds.receive(p);
      s[i] = new String(p.getData(), 0, p.getLength());
  }
  ds.close();
  assertEquals("<14><!DOCTYPE", s[0].substring(0,13));
  assertEquals("<14></table>", s[2].substring(0,12));
}
 

/**
 * Returns new UDP Transport instance
 * connected to specified socket address
 *
 * @param addr
 * @return connected Transport
 * @throws IOException
 */
public static Transport UDPInstance(SocketAddress addr) throws IOException {
    DatagramSocket sock = new DatagramSocket();
    sock.setSoTimeout(getTimeout());
    sock.connect(addr);

    StreamTransport trans = new StreamTransport();
    trans.setStreams(new UDPInputStream(sock), new UDPOutputStream(sock));
    trans.setAddressLabel(addr.toString());
    return trans;
}
 

public void testUDP() throws Exception {
	DatagramSocket client = new DatagramSocket();
	client.connect(new InetSocketAddress("127.0.0.1", port));
	client.setSoTimeout(500);

	byte[] writeBuf = new byte[16];
	byte[] readBuf = new byte[writeBuf.length];
	DatagramPacket wp = new DatagramPacket(writeBuf, writeBuf.length);
	DatagramPacket rp = new DatagramPacket(readBuf, readBuf.length);

	for (int i = 0; i < 10; i++) {
		fillWriteBuffer(writeBuf, i);
		client.send(wp);

		client.receive(rp);
		assertEquals(writeBuf.length, rp.getLength());
		assertTrue(Arrays.equals(writeBuf, readBuf));
	}

	try {
		client.receive(rp);
		fail("Unexpected incoming data.");
	} catch (SocketTimeoutException e) {
	}

	client.close();
}
 

@Override
	protected ServerInfoResponse doInBackground(Server... params) {
		server = params[0];
		try {
			InetAddress host = InetAddress.getByName(server.getHost());
			
			// Create ping message
			ByteBuffer buffer = ByteBuffer.allocate(12);
			buffer.putInt(0); // Request type
			buffer.putLong(server.getId()); // Identifier
			DatagramPacket requestPacket = new DatagramPacket(buffer.array(), 12, host, server.getPort());
			
			// Send packet and wait for response
			DatagramSocket socket = new DatagramSocket();
			socket.setSoTimeout(1000);
			socket.setReceiveBufferSize(1024);

            long startTime = System.nanoTime();

            socket.send(requestPacket);
			
			byte[] responseBuffer = new byte[24];
			DatagramPacket responsePacket = new DatagramPacket(responseBuffer, responseBuffer.length);
			socket.receive(responsePacket);

            int latencyInMs = (int) ((System.nanoTime()-startTime)/1000000);
			
			ServerInfoResponse response = new ServerInfoResponse(server, responseBuffer, latencyInMs);
							
			Log.i(Constants.TAG, "DEBUG: Server version: "+response.getVersionString()+"\nUsers: "+response.getCurrentUsers()+"/"+response.getMaximumUsers());
			
			return response;
			
		} catch (Exception e) {
//			e.printStackTrace();
		}

		return new ServerInfoResponse(); // Return dummy in case of failure
	}
 

@Override
protected Void doInBackground(Void... params)
{
    Logging.info(this, "started, network=" + connectionState.isNetwork()
            + ", wifi=" + connectionState.isWifi());

    final Character[] models = new Character[]{ 'x', 'p' };
    int modelId = 0;

    try
    {
        final InetAddress target = InetAddress.getByName("255.255.255.255");

        final DatagramSocket socket = new DatagramSocket(null);
        socket.setReuseAddress(true);
        socket.setBroadcast(true);
        socket.setSoTimeout(500);
        socket.bind(new InetSocketAddress(ISCP_PORT));

        while (!isStopped())
        {
            request(socket, target, models[modelId]);
            modelId++;
            if (modelId > 1)
            {
                modelId = 0;
            }
        }
        socket.close();
    }
    catch (Exception e)
    {
        Logging.info(this, "Can not open socket: " + e.toString());
    }

    Logging.info(this, "stopped");
    return null;
}
 

public void init() throws ModbusInitException {
    if (ipParameters.isEncapsulated())
        messageParser = new EncapMessageParser(true);
    else
        messageParser = new XaMessageParser(true);

    try {
        socket = new DatagramSocket();
        socket.setSoTimeout(getTimeout());
    }
    catch (SocketException e) {
        throw new ModbusInitException(e);
    }
    initialized = true;
}
 

public void connect() throws SocketTimeoutException, SocketException, UnknownHostException, IOException, InstantiationException, IllegalAccessException{
	System.out.println("[RUDPClient] Connecting to UDP port "+port+"...");
	if(state == ConnectionState.STATE_CONNECTED){System.out.println("[RUDPClient] Client already connected !");return;}
	if(state == ConnectionState.STATE_CONNECTING){System.out.println("[RUDPClient] Client already connecting !");return;}
	if(state == ConnectionState.STATE_DISCONNECTING){System.out.println("[RUDPClient] Client currently disconnecting !");return;}
	
	if(packetHandlerClass == null) throw new IOException("Unable to connect without packet handler");
	packetHandler = packetHandlerClass.newInstance();
	packetHandler.rudp = this;

	socket = new DatagramSocket();
	socket.setSoTimeout(RUDPConstants.CLIENT_TIMEOUT_TIME);

	lastPacketReceiveTime = System.currentTimeMillis();

	state = ConnectionState.STATE_CONNECTING;
	try {
		//Send handshake packet
		byte[] handshakePacket = new byte[9];
		handshakePacket[0] = RUDPConstants.PacketType.HANDSHAKE_START;
		NetUtils.writeBytes(handshakePacket, 1, RUDPConstants.VERSION_MAJOR);
		NetUtils.writeBytes(handshakePacket, 5, RUDPConstants.VERSION_MINOR);
		sendPacketRaw(handshakePacket);

		//Receive handshake response packet
		byte[] buffer = new byte[8196];
		DatagramPacket datagramPacket = new DatagramPacket(buffer, buffer.length, address, port);
		socket.receive(datagramPacket);
		byte[] data = new byte[datagramPacket.getLength()];
		System.arraycopy(datagramPacket.getData(), datagramPacket.getOffset(), data, 0, datagramPacket.getLength());

		//Handle handshake response packet
		if(data[0] != RUDPConstants.PacketType.HANDSHAKE_OK){

			state = ConnectionState.STATE_DISCONNECTED;
			byte[] dataText = new byte[data.length-1];
			System.arraycopy(data, 1, dataText, 0, dataText.length);
			throw new IOException("Unable to connect: "+new String(dataText, "UTF-8"));

		}
		else{

			state = ConnectionState.STATE_CONNECTED;
			initReceiveThread();
			initPingThread();
			initRelyThread();

			reliableThread.start();
			receiveThread.start();
			pingThread.start();

			System.out.println("[RUDPClient] Connected !");

		}
	} catch (IOException e) {
		state = ConnectionState.STATE_DISCONNECTED;
		throw e;
	}
}
 

private DatagramSocket createSocket() throws IOException {
    DatagramSocket socket = new DatagramSocket();

    socket.setSoTimeout(3000);
    return socket;
}
 

private void test3()
    throws UtilityException, SocketException, UnknownHostException, IOException,
        MessageAttributeParsingException, MessageAttributeException,
        MessageHeaderParsingException {
  int timeSinceFirstTransmission = 0;
  int timeout = timeoutInitValue;
  do {
    try {
      // Test 3 including response
      DatagramSocket sendSocket = new DatagramSocket(new InetSocketAddress(iaddress, 0));
      sendSocket.connect(InetAddress.getByName(stunServer), port);
      sendSocket.setSoTimeout(timeout);

      MessageHeader sendMH = new MessageHeader(MessageHeader.MessageHeaderType.BindingRequest);
      sendMH.generateTransactionID();

      ChangeRequest changeRequest = new ChangeRequest();
      changeRequest.setChangePort();
      sendMH.addMessageAttribute(changeRequest);

      byte[] data = sendMH.getBytes();
      DatagramPacket send = new DatagramPacket(data, data.length);
      sendSocket.send(send);
      LOGGER.debug("Test 3: Binding Request sent.");

      int localPort = sendSocket.getLocalPort();
      InetAddress localAddress = sendSocket.getLocalAddress();

      sendSocket.close();

      DatagramSocket receiveSocket = new DatagramSocket(localPort, localAddress);
      receiveSocket.connect(InetAddress.getByName(stunServer), ca.getPort());
      receiveSocket.setSoTimeout(timeout);

      MessageHeader receiveMH = new MessageHeader();
      while (!receiveMH.equalTransactionID(sendMH)) {
        DatagramPacket receive = new DatagramPacket(new byte[200], 200);
        receiveSocket.receive(receive);
        receiveMH = MessageHeader.parseHeader(receive.getData());
        receiveMH.parseAttributes(receive.getData());
      }
      ErrorCode ec =
          (ErrorCode)
              receiveMH.getMessageAttribute(MessageAttribute.MessageAttributeType.ErrorCode);
      if (ec != null) {
        di.setError(ec.getResponseCode(), ec.getReason());
        LOGGER.debug("Message header contains an Errorcode message attribute.");
        return;
      }
      if (nodeNatted) {
        di.setRestrictedCone();
        LOGGER.debug("Node is behind a restricted NAT.");
        return;
      }
    } catch (SocketTimeoutException ste) {
      if (timeSinceFirstTransmission < 7900) {
        LOGGER.debug("Test 3: Socket timeout while receiving the response.");
        timeSinceFirstTransmission += timeout;
        int timeoutAddValue = timeSinceFirstTransmission * 2;
        if (timeoutAddValue > 1600) {
          timeoutAddValue = 1600;
        }
        timeout = timeoutAddValue;
      } else {
        LOGGER.debug(
            "Test 3: Socket timeout while receiving the response. Maximum retry limit exceed. Give up.");
        di.setPortRestrictedCone();
        LOGGER.debug("Node is behind a port restricted NAT.");
        return;
      }
    }
  } while (true);
}
 

private boolean test2()
    throws UtilityException, SocketException, UnknownHostException, IOException,
        MessageAttributeParsingException, MessageAttributeException,
        MessageHeaderParsingException {
  int timeSinceFirstTransmission = 0;
  int timeout = timeoutInitValue;
  do {
    try {
      // Test 2 including response
      DatagramSocket sendSocket = new DatagramSocket(new InetSocketAddress(iaddress, 0));
      sendSocket.connect(InetAddress.getByName(stunServer), port);
      sendSocket.setSoTimeout(timeout);

      MessageHeader sendMH = new MessageHeader(MessageHeader.MessageHeaderType.BindingRequest);
      sendMH.generateTransactionID();

      ChangeRequest changeRequest = new ChangeRequest();
      changeRequest.setChangeIP();
      changeRequest.setChangePort();
      sendMH.addMessageAttribute(changeRequest);

      byte[] data = sendMH.getBytes();
      DatagramPacket send = new DatagramPacket(data, data.length);
      sendSocket.send(send);
      LOGGER.debug("Test 2: Binding Request sent.");

      int localPort = sendSocket.getLocalPort();
      InetAddress localAddress = sendSocket.getLocalAddress();

      sendSocket.close();

      DatagramSocket receiveSocket = new DatagramSocket(localPort, localAddress);
      receiveSocket.connect(ca.getAddress().getInetAddress(), ca.getPort());
      receiveSocket.setSoTimeout(timeout);

      MessageHeader receiveMH = new MessageHeader();
      while (!receiveMH.equalTransactionID(sendMH)) {
        DatagramPacket receive = new DatagramPacket(new byte[200], 200);
        receiveSocket.receive(receive);
        receiveMH = MessageHeader.parseHeader(receive.getData());
        receiveMH.parseAttributes(receive.getData());
      }
      ErrorCode ec =
          (ErrorCode)
              receiveMH.getMessageAttribute(MessageAttribute.MessageAttributeType.ErrorCode);
      if (ec != null) {
        di.setError(ec.getResponseCode(), ec.getReason());
        LOGGER.debug("Message header contains an Errorcode message attribute.");
        return false;
      }
      if (!nodeNatted) {
        di.setOpenAccess();
        LOGGER.debug(
            "Node has open access to the Internet (or, at least the node is behind a full-cone NAT without translation).");
      } else {
        di.setFullCone();
        LOGGER.debug("Node is behind a full-cone NAT.");
      }
      return false;
    } catch (SocketTimeoutException ste) {
      if (timeSinceFirstTransmission < 7900) {
        LOGGER.debug("Test 2: Socket timeout while receiving the response.");
        timeSinceFirstTransmission += timeout;
        int timeoutAddValue = timeSinceFirstTransmission * 2;
        if (timeoutAddValue > 1600) {
          timeoutAddValue = 1600;
        }
        timeout = timeoutAddValue;
      } else {
        LOGGER.debug(
            "Test 2: Socket timeout while receiving the response. Maximum retry limit exceed. Give up.");
        if (!nodeNatted) {
          di.setSymmetricUDPFirewall();
          LOGGER.debug("Node is behind a symmetric UDP firewall.");
          return false;
        } else {
          // not is natted
          // redo test 1 with address and port as offered in the changed-address message attribute
          return true;
        }
      }
    }
  } while (true);
}
 

public static NameServerProxy locateNS(String host, int port, byte[] hmacKey) throws IOException {
	if(host!=null) {
		if(port==0)
			port=Config.NS_PORT;
		NameServerProxy proxy=new NameServerProxy(host, port);
		proxy.pyroHmacKey = hmacKey;
		proxy.ping();
		return proxy;
	}
	if(port==0)
		port=Config.NS_BCPORT;
	DatagramSocket udpsock=new DatagramSocket();
	udpsock.setSoTimeout(3000);
	udpsock.setBroadcast(true);
	byte[] buf="GET_NSURI".getBytes();
	if(host==null)
		host="255.255.255.255";
	InetAddress address=InetAddress.getByName(host);
	DatagramPacket packet=new DatagramPacket(buf, buf.length, address, port);
	udpsock.send(packet);
	
	DatagramPacket response=new DatagramPacket(new byte[100], 100);
	try
	{
		udpsock.receive(response);
	}
	catch(SocketTimeoutException x)
	{
		// try localhost explicitly (if host wasn't localhost already)
		if(!host.startsWith("127.0") && !host.equals("localhost"))
			return locateNS("localhost", Config.NS_PORT, hmacKey);
		else
			throw x;
	}
	finally {
		udpsock.close();
	}
	String location=new String(response.getData(), 0, response.getLength());
	NameServerProxy nsp = new NameServerProxy(new PyroURI(location));
	nsp.pyroHmacKey = hmacKey;
	return nsp;
}
 

/**
 * Receive a response from the server after the burst of uplink packets was sent, parse it, and
 * return the number of packets the server received.
 * 
 * @param sock the socket used to receive the server's response
 * @return the number of packets the server received
 * 
 * @throws MeasurementError if an error or a timeout occurs
 */
private UDPResult recvUpResponse(DatagramSocket sock) throws MeasurementError {
  UDPBurstDesc desc = (UDPBurstDesc) measurementDesc;

  UDPResult udpResult = new UDPResult();
  // Receive response
  Logger.i("Waiting for UDP response from " + desc.target + ": " + targetIp);

  byte buffer[] = new byte[UDPBurstTask.MIN_PACKETSIZE];
  DatagramPacket recvpacket = new DatagramPacket(buffer, buffer.length);

  if (stopFlag) {
    throw new MeasurementError("Cancelled");
  }

  try {
    sock.setSoTimeout(RCV_UP_TIMEOUT);
    sock.receive(recvpacket);
  } catch (SocketException e1) {
    sock.close();
    throw new MeasurementError("Timed out reading from " + desc.target);
  } catch (IOException e) {
    sock.close();
    throw new MeasurementError("Error reading from " + desc.target);
  }
  // Reconstruct UDP packet from flattened network data
  UDPPacket responsePacket = new UDPPacket(recvpacket.getData());
  dataConsumed+=recvpacket.getLength();

  if (responsePacket.type == PKT_RESPONSE) {
    // Received seq number must be same with client seq
    if (responsePacket.seq != seq) {
      Logger.e("Error: Server send response packet with different seq, old " + seq + " => new "
          + responsePacket.seq);
    }

    Logger.i("Recv UDP resp from " + desc.target + " type:" + responsePacket.type + " burst:"
        + responsePacket.burstCount + " pktnum:" + responsePacket.packetNum
        + " out_of_order_num: " + responsePacket.outOfOrderNum + " jitter: "
        + responsePacket.timestamp);

    udpResult.packetCount = responsePacket.packetNum;
    udpResult.outOfOrderRatio = (double) responsePacket.outOfOrderNum / responsePacket.packetNum;
    udpResult.jitter = responsePacket.timestamp;
    return udpResult;
  } else {
    throw new MeasurementError("Error: not a response packet! seq: " + seq);
  }
}
 

/**
 * @param userid user id for security check
 * @param otp    one time password
 * @return true if the authentication was confirmed, false else
 * @throws UnknownHostException         if the server is not known
 * @throws UnsupportedEncodingException if UTF-8 is not installed on the server
 * @throws IOException                  if anything bad happens and connection
 *                                      could not be retried
 */
public boolean checkOTP(String userid, String otp)
		throws UnknownHostException, UnsupportedEncodingException, IOException {
	RequestSummary requestsummary = generateRequestPacket(userid, otp);
	DatagramPacket reply = new DatagramPacket(new byte[MAX_PACKET_SIZE], MAX_PACKET_SIZE);

	DatagramSocket socket = new DatagramSocket();
	socket.setSoTimeout(TIMEOUT);
	int retrycount = 0;
	boolean success = false;
	while (retrycount <= RETRY & !success) {
		try {
			socket.send(requestsummary.getPayload());
			socket.receive(reply);
			success = true;
		} catch (IOException e) {
			logger.warning("Exception in communicating with Radius server "+e.getMessage());
			for (int i=0;i<e.getStackTrace().length;i++) logger.warning("   - "+e.getStackTrace()[i]);
			try {
				Thread.sleep(300);
			} catch (InterruptedException e1) {
				logger.warning("Interrupted Exception " + e1.getMessage());
			}
		}
	}
	socket.close();
	ByteArrayInputStream in = new ByteArrayInputStream(reply.getData());
	int responsetype = in.read() & 0x0ff;
	int serverid = in.read() & 0x0ff;
	int messagelength = (in.read() & 0x0ff) << 8 | (in.read() & 0x0ff);
	byte[] authenticator = new byte[16];
	byte[] attributepayload = new byte[messagelength - HEADER_LENGTH];
	in.read(authenticator);
	in.read(attributepayload);
	in.close();
	checkReplyAuthenticator(secret, responsetype, serverid, messagelength, attributepayload,
			requestsummary.getAuthenticator(), authenticator);
	if (responsetype == ACCESS_ACCEPT)
		return true;
	return false;

}
 

/**
 * Initiates UdpMessenger, binds it to the specified port and IP address and
 * starts listening.
 * 
 * @param port
 *            - port to bind socket to.
 * @param address
 *            - IP address to bind socket to.
 * @throws SocketException
 *             if the socket could not be opened, or the socket could not
 *             bind to the specified local port.
 */
public UdpMessenger(int port, InetAddress address) throws SocketException {
	this.port = port;
	listeners = new ArrayList<UdpListener>();
	bufferSize = DEFAULTBUFFERSIZE;
	socket = new DatagramSocket(this.port, address);
	socket.setSoTimeout(0);
	this.setDaemon(true);
	this.setName("IPMIListener" + address + ":" + socket.getLocalPort());
	this.start();
}