Can not find device even phone connect to same wifi network

[nvThanh]

The app pending at finding device ( other app take 1 sec to found device ),

[nvThanh]

private String scanForRoku(URL url) throws IOException {
byte[] sendData = new byte[1024];
byte[] receiveData = new byte[1024];
String MSEARCH = "M-SEARCH * HTTP/1.1\nHost: " + url.getHost() + ":" + url.getPort() + "\nMan: "ssdp:discover"\nST: roku:ecp\n";
sendData = MSEARCH.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, InetAddress.getByName(url.getHost()), url.getPort());
DatagramSocket clientSocket = new DatagramSocket();
clientSocket.send(sendPacket);
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
clientSocket.receive(receivePacket);
String response = new String(receivePacket.getData());
clientSocket.close();
response = response.toLowerCase();
String address = response.split("location:")[1].split("\n")[0].split("http://")[1].split(":")[0].trim();
return address;
}

its stuck in here, maybe you run more than 1 thread at the same time