Audio option

pico.js

         rpc.onclose = (e) => {
             console.log(username, e)
         }
+        rpc.oniceconnectionstatechange = (e) => {
+            m.redraw()
+        }
         State.rpcs[username] = rpc
     }
     return State.rpcs[username]
     },
 }
 const Media = {
-    constraints: {audio: true, video: {width: {ideal: 320}, facingMode: 'user'}},
-    turnOn: async () => {
-        const media = await navigator.mediaDevices.getUserMedia(Media.constraints)
+    audioVideo: {audio: true, video: {width: {ideal: 320}, facingMode: 'user'}},
+    audioOnly: {audio: true, video: false},
+    turnOn: (constraints) => async () => {
+        const media = await navigator.mediaDevices.getUserMedia(constraints)
         State.media[State.username] = media
         wire({kind: 'peerInfo', value: {type: 'request'}})
         m.redraw()
     view() {
         if(!State.media[State.username]) {
             return m('.media',
-                m('button', {onclick: Media.turnOn}, 'turn media on'),
+                m('button', {onclick: Media.turnOn(Media.audioVideo)}, 'turn media on'),
+                m('button', {onclick: Media.turnOn(Media.audioOnly)}, 'turn audio on'),
             )
         }
         else {
     }
 
     State.websocket.onclose = (e) => {
+        State.online.forEach(signalPeerStop)
         if(!e.wasClean) {
             setTimeout(connect, 1000, username)
         }