HelloNet version 1.2.1 added support for customer URL handling, allowing other apps on your iOS device to launch HelloNet and start looking for services. Developers can build support for launching HelloNet in their apps and websites.
HelloNet responds to two URL formats. The simplest one is used simply to launch HelloNet.
The second format launches HelloNet and starts discovering the specified service type.
hellonet://browse/<DNS SRV Service Type>
hellonet://browse/_http._tcp hellonet://browse/_ssh._tcp hellonet://browse/_rowmote._tcp
An old list of DNS SRV Service Types can be found here, now that IANA is handling official service registrations.