Subtypes

Subtypes are used to define features implemented by a service instance. See RFC 6763 - 7.1 Selective Instance Enumeration (Subtypes) for the details.

Finding service instances

QueryServiceInstances is used to find the all the instances of a service with a specific feature. The ServiceInstanceDiscovered event is raised each time a service instance is discovered.

using Makaretu.Dns;

var sd = new ServiceDiscovery();
sd.ServiceInstanceDiscovered += (s, e) =>
{
    Console.WriteLine($"service instance '{e.ServiceInstanceName}'");
};
sd.QueryServiceInstances("_myservice", "apiv2");

Advertising

Create a ServiceProfile with a feature and then Advertise it. Any queries for the service or service instance will be answered with information from the profile.

using Makaretu.Dns;

var profile = new ServiceProfile("x", "_myservice._udp", 1024);
profile.Subtypes.Add("apiv2");
var sd = new ServiceDiscovery();
sd.Advertise(profile);