private void startSearching(boolean clearResults) {
stopSearching();
if (clearResults) {
bridges.clear();
bridgesAdapter.clear();
}
bridgeSearchTask = new BridgeSearchTask();
bridgeSearchTask.execute();
setSearchIndicator(true);
}
private void stopSearching() {
if (bridgeSearchTask != null) {
bridgeSearchTask.cancel(true);
bridgeSearchTask = null;
bridgesList.post(
new Runnable() {
@Override
public void run() {
setSearchIndicator(false);
}
});
}
}
private void searchBridgesUPnP(BridgeSearchTask task) throws IOException {
// Search bridges on local network using UPnP
String upnpRequest =
"M-SEARCH * HTTP/1.1\nHOST: 239.255.255.250:1900\nMAN: ssdp:discover\nMX: 8\nST:SsdpSearch:all";
DatagramSocket upnpSock = new DatagramSocket();
upnpSock.setSoTimeout(100);
upnpSock.send(
new DatagramPacket(
upnpRequest.getBytes(),
upnpRequest.length(),
new InetSocketAddress("239.255.255.250", 1900)));
HashSet<String> ipsDiscovered = new HashSet<String>();
// Add any existing results from bruteforce search and previous searches
for (Bridge b : bridges) {
ipsDiscovered.add(b.getIp());
}
long start = System.currentTimeMillis();
long nextBroadcast = start + BROADCAST_INTERVAL;
while (true) {
// Send a new discovery broadcast once a second
if (System.currentTimeMillis() > nextBroadcast) {
upnpSock.send(
new DatagramPacket(
upnpRequest.getBytes(),
upnpRequest.length(),
new InetSocketAddress("239.255.255.250", 1900)));
nextBroadcast = System.currentTimeMillis() + BROADCAST_INTERVAL;
}
byte[] responseBuffer = new byte[1024];
DatagramPacket responsePacket = new DatagramPacket(responseBuffer, responseBuffer.length);
try {
upnpSock.receive(responsePacket);
} catch (SocketTimeoutException e) {
if (System.currentTimeMillis() - start > SEARCH_TIMEOUT || task.isCancelled()) {
break;
} else {
continue;
}
}
final String ip = responsePacket.getAddress().getHostAddress();
final String response = new String(responsePacket.getData());
if (!ipsDiscovered.contains(ip)) {
Matcher m = Pattern.compile("LOCATION: (.*)", Pattern.CASE_INSENSITIVE).matcher(response);
if (m.find()) {
tryIP(ip, m.group(1), 1000);
}
// Ignore subsequent packets
ipsDiscovered.add(ip);
}
}
}
