网络发现请求

Question

我需要从设备发送请求，该请求在当前网络（wifi）上查找已经实现了客户端的特定设备。我需要获取所有此类设备的IP地址。到目前为止，我有这个：

protected Void doInBackground(Void... voids) {

            DatagramSocket socket = null;
            try {
                socket = new DatagramSocket(7432);
                byte[] msg = new byte[]{0,2,9,0,4};
                Log.d("sending", "Sending data " + Arrays.toString(msg));

                DatagramPacket packet = new DatagramPacket(msg, msg.length,
                        InetAddress.getByName("192.168.1.255"), 7432);
                socket.send(packet);
                socket.setBroadcast(true);
            } catch (SocketException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            byte[] buf = new byte[1024];
            DatagramPacket packet = new DatagramPacket(buf, buf.length);
            try {
                while (true) {
                    if (socket != null){
                        socket.receive(packet);
                    }
                    String s = String.valueOf(packet.getAddress());
                    Log.e("response", "Received response " + s);
                }
            } catch (SocketTimeoutException e) {
                Log.d("timeout", "Receive timed out");
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

我也尝试使用255.255.255.255，但出现此错误： E/adbd: failed to connect to socket 'localabstract:com.example.fixxxer.skyzapper': Connection refused 我什至不确定目前为止的代码是否正确，但是令人惊讶的是，网上没有足够的信息，因此一旦我尝试也无法正常工作。我在这个问题上停留了很长时间。