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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Example script to illustrate how to use the mdns package to discover the port
// of a Dart observatory over mDNS.
// ignore_for_file: avoid_print
import 'package:multicast_dns/multicast_dns.dart';
Future<void> main() async {
// Parse the command line arguments.
const String name = '_dartobservatory._tcp.local';
final MDnsClient client = MDnsClient();
// Start the client with default options.
await client.start();
// Get the PTR record for the service.
await for (final PtrResourceRecord ptr in client
.lookup<PtrResourceRecord>(ResourceRecordQuery.serverPointer(name))) {
// Use the domainName from the PTR record to get the SRV record,
// which will have the port and local hostname.
// Note that duplicate messages may come through, especially if any
// other mDNS queries are running elsewhere on the machine.
await for (final SrvResourceRecord srv in client.lookup<SrvResourceRecord>(
ResourceRecordQuery.service(ptr.domainName))) {
// Domain name will be something like "io.flutter.example@some-iphone.local._dartobservatory._tcp.local"
final String bundleId =
ptr.domainName; //.substring(0, ptr.domainName.indexOf('@'));
print('Dart observatory instance found at '
'${}:${srv.port} for "$bundleId".');