show notification for incoming calls

meshchat.py

@@ -167,6 +167,9 @@ async def announce_loop(self):
     # handle receiving a new audio call
     def on_incoming_audio_call(self, audio_call: AudioCall):
         print("on_incoming_audio_call: {}".format(audio_call.link.hash.hex()))
+        asyncio.run(self.websocket_broadcast(json.dumps({
+            "type": "incoming_audio_call",
+        })))
 
     # web server has shutdown, likely ctrl+c, but if we don't do the following, the script never exits
     async def shutdown(self, app):

public/index.html

@@ -1569,6 +1569,17 @@
                             this.getConfig();
                             break;
                         }
+                        case 'incoming_audio_call': {
+                            Notification.requestPermission().then((result) => {
+                                if(result === "granted"){
+                                    new window.Notification("Incoming Call", {
+                                        body: "Someone is calling you.",
+                                        tag: "new_audio_call", // only ever show one notification at a time
+                                    });
+                                }
+                            });
+                            break;
+                        }
                         case 'lxmf.delivery': {
 
                             // add inbound message to ui