public class ONVIFDeviceDiscoveryFIN { private static final String regexAddrs = "(\\S+)"; private static final String regexScope = "<\\S+:Scopes>(.*?)<\\S+:Scopes>"; private static final String regexHardware = "onvif:\\/\\/www\\.onvif\\.org\\/name\\/(\\S+)(?=\\s*)"; private static final Pattern addrsPattern = Pattern.compile(regexAddrs, Pattern.MULTILINE); private static final Pattern hardwarePattern = Pattern.compile(regexHardware, Pattern.MULTILINE); private static final Pattern scopePattern = Pattern.compile(regexScope, Pattern.MULTILINE); // Following constants are related to Discovery process private static final int WS_DISCOVERY_TIMEOUT = 3000; private static final int WS_DISCOVERY_PORT = 3702; private static final String WS_DISCOVERY_ADDRESS_IPv4 = "239.255.255.250"; // note that the probe below MUST be given a unique urn:uuid. Devices will NOT reply if the urn:uuid is not unique! private static final String WS_DISCOVERY_PROBE_MESSAGE = "" + "" + "http://schemas.xmlsoap.org/ws/2005/04/discovery/Probe" + "uuid:17e84964-954f-4186-b38f-a344b49c9a53" + "http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous" + "urn:schemas-xmlsoap-org:ws:2005:04:discovery" + "" + "" + "" + "dp0:NetworkVideoTransmitter"; private static Map getResponsesToProbe(String uuid) throws IOException { final String probe = WS_DISCOVERY_PROBE_MESSAGE.replaceAll("urn:uuid:.*", "urn:uuid:" + uuid + ""); final int port = 55000; DatagramSocket senderAndReceiver = new DatagramSocket(port, InetAddress.getByName("172.16.13.66")); // so you do need to know the address of your network interface to discover devices on... senderAndReceiver.setSoTimeout(WS_DISCOVERY_TIMEOUT); // send the probe DatagramPacket probeMsg = new DatagramPacket(probe.getBytes(), probe.length(), InetAddress.getByName(WS_DISCOVERY_ADDRESS_IPv4), WS_DISCOVERY_PORT); senderAndReceiver.send(probeMsg); // read in the responses TreeMap responses = new TreeMap<>(); while (true) { try { byte[] receiverBuffer = new byte[8192]; DatagramPacket receiverPacket = new DatagramPacket(receiverBuffer, receiverBuffer.length); // this is the packet that receive the response in. Get's updated with the next response on each call to .receive() senderAndReceiver.receive(receiverPacket); String ip = receiverPacket.getAddress().getHostAddress(); responses.put(ip, new String(receiverPacket.getData()).trim()); } catch (SocketTimeoutException e) { break; } } // close the socket senderAndReceiver.close(); return responses; } public static String getXAddress(String xml) { Matcher addrMatcher = addrsPattern.matcher(xml); if (addrMatcher.find()) { return addrMatcher.group(1); } return null; } public static String getHardwareCode(String xml) { final Matcher hardwareMatcher = hardwarePattern.matcher(xml); if (hardwareMatcher.find()) { return URLDecoder.decode(hardwareMatcher.group(1), StandardCharsets.UTF_8); } System.out.println(xml); return null; } public static String getScope(String xml) { Matcher matcher = scopePattern.matcher(xml); if (matcher.find()) { return matcher.group(1); } return null; } public static void main(String[] args) throws Exception { final String uuid = UUID.randomUUID().toString(); // generate the uuid to add to the Probe message Map responses = getResponsesToProbe(uuid); // responses is a collection of all the SOAP-infused XML ProbeMatches . It's all of our responses to the probe; it's basically the devices we've discovered! final Set> entries = responses.entrySet(); for (Map.Entry entry : entries) { final String k = entry.getKey(); final String v = entry.getValue(); String scope = getScope(v); System.out.println(k + " " + getHardwareCode(scope)); } } }