play indoor chime on ring

static/main.html

@@ -13,6 +13,8 @@
     <section id="log">
       <h1>Incoming Events</h1>
     </section>
+
+    <audio id="chime" src="indoor.mp3"></audio>
     <template id="connected">
       <span class="connected">Connected</span>
     </template>
@@ -60,6 +62,10 @@
           });
 
           sse.addEventListener('ring', msg => {
+            let chime = document.getElementById('chime');
+            if (chime.paused) {
+              chime.play();
+            }
             const template = get_template('ring');
             $('#log').append(template);
           });