Bonsoir is a Zeroconf library that allows you to discover network services and to broadcast your own. It's based on Android NSD and on Apple's popular framework Bonjour. In fact, Bonsoir can be translated into Good evening (and Bonjour into Good morning or Good afternoon depending on the current moment of the day).

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Bonsoir preview

Code snippets

Here is how you can broadcast your service using Bonsoir :

// Let's create our service !
BonsoirService service = BonsoirService(
  name: 'My wonderful service', // Put your service name here.
  type: '_wonderful-service._tcp', // Put your service type here. Syntax : _ServiceType._TransportProtocolName. (see
  port: 3030, // Put your service port here.

// And now we can broadcast it :
BonsoirBroadcast broadcast = BonsoirBroadcast(service: service);
await broadcast.ready;
await broadcast.start();

// ...

// Then if you want to stop the broadcast :
await broadcast.stop();

And here is how you can search for a broadcasted service :

// This is the type of service we're looking for :
String type = '_wonderful-service._tcp';

// Once defined, we can start the discovery :
BonsoirDiscovery discovery = BonsoirDiscovery(type: type);
await discovery.ready;
await discovery.start();

// If you want to listen to the discovery :
discovery.eventStream.listen((event) {
  if (event.type == BonsoirDiscoveryEventType.DISCOVERY_SERVICE_RESOLVED) {
    print('Service found : ${event.service.toJson()}')
  } else if (event.type == BonsoirDiscoveryEventType.DISCOVERY_SERVICE_LOST) {
    print('Service lost : ${event.service.toJson()}')

// Then if you want to stop the discovery :
await discovery.stop();

If you want a full example, don't hesitate to check this one on Github.

Final notes

This plugin cannot be tested on an Android emulator (well it can, but the only services that you are able to discover are the ones broadcasted by your emulator).

Also, if you're building your app for iOS 14, you may have to edit your Info.plist file according to this answer on Apple Developer Forums.

The hand icon has been created by Vitaly Gorbachev.


You have a lot of options to contribute to this project ! You can :