broadcast-connect-disco

// a broadcast-channel-ification of https://github.com/mkruisselbrink/navigator-connect/issues/1#issuecomment-62989902

var discoveryService = new BroadcastChannel("discoveryservice");

// service discovery
var serviceChannelName = "appservice"
var notifyService = new BroadcastChannel(serviceChannelName);
setTimeout(function(){
  discoveryService.postMessage({ service: "net.yoyodyne.Notify", channel: serviceChannelName });
},100)
// notify service
setTimeout(function(){
  if (Math.random() < 0.5) notifyService.postMessage({notice:"notice"});
},1000);

// client
var discoveryConsumer = new BroadcastChannel("discoveryservice")
var discoverNotify = function(e) {
  if(e.data && e.data.service === "net.yoyodyne.Notify" && e.data.channel) {
    discoveryConsumer.removeListener(discoverNotify)
    var notifyChannel = new BroadcastChannel(e.data.channel)
    notifyChannel.addEventListener("message", function(f) {
      console.log("Important message from " + f.origin + ": " + JSON.stringify(f.data))
    })
  }
})
discoveryConsumer.addEventListener("discoveryservice", discoverNotify)

navigator-connect-disco

// https://github.com/mkruisselbrink/navigator-connect/issues/1#issuecomment-62989902

// service worker:
self.onactivate = function(e) {
  e.waitUntil(navigator.connect('https://rektide.com/discoveryservice/register').then(
    function(port) {
      port.postMessage({url: 'https://example.com/services/notify', action: 'com.rektide.Notify'});
    }
  ));
};
// other event handlers...

// client code:
navigator.connect('https://rektide.com/discoveryservice/lookup').then(
  function(discoveryPort) {
    discoveryPort.postMessage({action: 'com.rektide.Notify'});
    discoveryPort.onmessage = function(event) {
      var services = event.data.services;
      navigator.connect(services[0]).then(
        function(port) {
          // ....
        }
      );
    };
  }
);