MDNSServiceDiscoverer
Discovers peers on the local network via mDNS / Bonjour using NSNetServiceBrowser on iOS.
Browse-only: hosting remains JVM-only via MDNSServiceAdvertiser / JmDNS.
The browser is scheduled on NSRunLoop.mainRunLoop so callbacks fire regardless of which dispatcher collects the flow.
Parameters
serviceType
The mDNS service type. Supply the canonical base form (e.g. MDNSServiceType("_myapp._tcp")) — NSNetServiceBrowser receives the type without the local. domain (which is passed separately to NSNetServiceBrowser.searchForServicesOfType).