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POWhy can't my application receive the data using UDP in Hotsport network?
 

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  1. POWhy can't my application receive the data using UDP in Hotsport network?
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    <p>Why can't my application receive the data using UDP in Hotsport network? But my application can receive the data using UDP in normal Wi-Fi network. The code of the sender is:</p> <pre><code>@Override public void run() { super.run(); DatagramPacket dataPacket = null; try { udpSocket = new DatagramSocket(DEFAULT_PORT); dataPacket = new DatagramPacket(buffer, MAX_DATA_PACKET_LENGTH); while (isRunning) { String address = getLocalIPAddress(); if (address != null) { byte[] data = address.getBytes(); dataPacket.setData(data); dataPacket.setLength(data.length); dataPacket.setPort(DEFAULT_PORT); InetAddress broadcastAddr; broadcastAddr = InetAddress.getByName("255.255.255.255"); dataPacket.setAddress(broadcastAddr); try { Log.i(DazzleApplication.TAG,"Sending----&gt;"+address); sleep(3000); } catch (Exception e) { e.printStackTrace(); } } } if (udpSocket != null) udpSocket.close(); } catch (Exception e) { e.printStackTrace(); } } </code></pre> <p>The code of the receiver is:</p> <pre><code>public void run() { DatagramPacket udpPacket=null; byte[] data=null ; try { udpSocket = new DatagramSocket(43708); udpSocket.setSoTimeout(3000); data= new byte[256]; udpPacket= new DatagramPacket(data, 256); } catch (SocketException e) { e.printStackTrace(); System.out.println(e.toString()); } while (start) { System.out.println("DazzleTest Receive....."); try { udpSocket.receive(udpPacket); } catch (Exception e) { e.printStackTrace(); System.out.println(e.toString()); } if (udpPacket.getLength() != 0) { String codeString = new String(data, 0, udpPacket.getLength()); Message msg = new Message(); msg.obj = codeString; mH.sendMessageDelayed(msg, 1000); System.out.println("receiver---&gt;"+codeString); }else{ System.out.println("receiver null"); } } if (udpSocket != null) { udpSocket.close(); } } </code></pre> <p>Why? Who can explain this case? The UDP can't work in Hotspot??</p> <p>Update the following information: The sender of the socket run in the HTC HD which is opened Hotspot. it can catch the exception: <code>java.net.SocketException: Network is unreachable: connect</code> .</p>
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