@Override
public void run() {
DatagramSocket socket;
int clientListnport = Constants.UDPPort;
try {
// Keep a socket open to listen to all the UDP trafic that is
// destined for this port
socket = new DatagramSocket(clientListnport, (Inet4Address) InetAddress.getByName("0.0.0.0"));
socket.setBroadcast(true);
socket.setSoTimeout(10000);
while (WifiReceiver.isWifi) {
System.out.println(">>>Ready to receive broadcast packets!");
// Receive a packet
byte[] recvBuf = new byte[15000];
DatagramPacket packet = new DatagramPacket(recvBuf, recvBuf.length);
try {
socket.receive(packet);
// Packet received
System.out.println(
">>>Discovery packet received from: " + packet.getAddress().getHostAddress());
// See if the packet holds the right command (message)
String message = new String(packet.getData()).trim();
if (message.equals(Constants.serverDiscoverString)) {
byte[] sendData = Constants.clientReplyString.getBytes();
// Send a response
if (!WifiUtils.getipAddress()
.equalsIgnoreCase(packet.getAddress().getHostAddress().toString())) {
DatagramPacket sendPacket =
new DatagramPacket(
sendData, sendData.length, packet.getAddress(), packet.getPort());
socket.send(sendPacket);
System.out.println(">>>Sent packet to: " + sendPacket.getAddress().getHostAddress());
}
} else if (message.equals(Constants.serverFileSending)) {
System.out.println("sending reply to recive handshake");
byte[] sendData = Constants.clientFileReceive.getBytes();
DatagramPacket sendPacket =
new DatagramPacket(
sendData, sendData.length, packet.getAddress(), packet.getPort());
socket.send(sendPacket);
Log.d(loggerTag, "handshaking is done");
FileReceiver.waitConnection();
}
} catch (SocketTimeoutException e) {
// no need of doing anything
}
}
System.out.println("CLientListener : Listener is stoped");
} catch (IOException ex) {
System.err.println(ex);
}
}