private void searchBridgesBruteforce(BridgeSearchTask task) {
HashSet<String> ipsDiscovered = new HashSet<String>();
// Add any existing results if continuing from an existing search
for (Bridge b : bridges) {
ipsDiscovered.add(b.getIp());
}
// Build list of IPs to search (search from center to outer range, because devices are usually
// around 192.168.1.100)
ArrayList<String> ips = new ArrayList<String>(255);
ips.add("192.168.1.127");
for (int i = 1; i <= 127; i++) {
ips.add("192.168.1." + (127 - i));
ips.add("192.168.1." + (127 + i));
}
// Check every IP for a listening device
for (int i = 0; i < 255; i++) {
try {
final String ip = ips.get(i);
if (ipsDiscovered.contains(ip)) continue;
tryIP(ip, "http://" + ip + "/description.xml", 20);
} catch (IOException e) {
// Either no device or not a Philips Hue bridge, move on
} catch (Exception e) {
// Other types of exceptions sometimes occur when device is misbehaving (e.g. bad UPnP
// description file)
}
}
}
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);
}
}
}