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 <html>
   <head>
      <title>Autobahn Serial2Ws</title>

      <script src="http://autobahn.s3.amazonaws.com/js/autobahn.min.js"></script>
      <script src="smoothie.js"></script>

      <script>

         var sess = null;
         var wsuri = "ws://" + window.location.hostname + ":9000";
         var retryCount = 0;
         var retryDelay = 2;

         var analog0 = null;
         var analog1 = null;

         var analog0_last = null;
         var analog1_last = null;

         var line0 = new TimeSeries();
         var line1 = new TimeSeries();

         var eventCnt = 0;
         var eventCntUpdateInterval = 2;

         function onAnalogValue(topicUri, event) {
            eventCnt += 1;
            event.value = event.value / 400 * 100;
            event.value = event.value.toFixed(2);
            switch (event.id) {
               case 0:
                  analog0.innerHTML = event.value;
                  if (analog0_last !== null) {
                     line0.append(new Date().getTime(), analog0_last);
                  }
                  analog0_last = event.value;
                  line0.append(new Date().getTime(), event.value);
                  break;
               case 1:
                  analog1.innerHTML = event.value;
                  if (analog1_last !== null) {
                     line1.append(new Date().getTime(), analog1_last);
                  }
                  analog1_last = event.value;
                  line1.append(new Date().getTime(), event.value);
                  break;
               default:
                  break;
            }
         }

         function controlLed(status) {
            sess.call("rpc:control-led", status).always(ab.log);
         }

         function updateEventCnt() {
            document.getElementById("event-cnt").innerHTML = Math.round(eventCnt/eventCntUpdateInterval) + " events/s";
            eventCnt = 0;
         }

         function connect() {

            statusline = document.getElementById('statusline');

            sess = new ab.Session(wsuri,
               function() {

                  statusline.innerHTML = "Connected to " + wsuri;
                  retryCount = 0;

                  sess.prefix("event", "http://example.com/mcu#");
                  sess.subscribe("event:analog-value", onAnalogValue);

                  sess.prefix("rpc", "http://example.com/mcu-control#");

                  eventCnt = 0;

                  window.setInterval(updateEventCnt, eventCntUpdateInterval * 1000);
               },
               function() {
                  console.log(retryCount);
                  retryCount = retryCount + 1;
                  statusline.innerHTML = "Connection lost. Reconnecting (" + retryCount + ") in " + retryDelay + " secs ..";
                  window.setTimeout(connect, retryDelay * 1000);
               }
            );
         }


         window.onload = function ()
         {
            analog0 = document.getElementById('analog0');
            analog1 = document.getElementById('analog1');

            var smoothie = new SmoothieChart({grid: {strokeStyle: 'rgb(125, 0, 0)',
                                                     fillStyle: 'rgb(60, 0, 0)',
                                                     lineWidth: 1,
                                                     millisPerLine: 250,
                                                     verticalSections: 6},
                                              minValue: 0,
                                              maxValue: 100,
                                              resetBounds: false,
                                              //interpolation: "line"
                                              });

            smoothie.addTimeSeries(line0, { strokeStyle: 'rgb(0, 255, 0)', fillStyle: 'rgba(0, 255, 0, 0.4)', lineWidth: 3 });
            smoothie.addTimeSeries(line1, { strokeStyle: 'rgb(255, 0, 255)', fillStyle: 'rgba(255, 0, 255, 0.3)', lineWidth: 3 });

            smoothie.streamTo(document.getElementById("mycanvas"));

            connect();
         };
     </script>
   </head>
   <body>
      <h1>Autobahn WebSockets: MCU to WS Gateway Demo</h1>

      <h2>Control LED</h2>
      <button onclick="controlLed(false)">LED Off</button>
      <button onclick="controlLed(true)">LED On</button>

      <h2>Analog Values</h2>
      <p>Analog 0 : <span id="analog0">-</span></p>
      <p>Analog 1 : <span id="analog1">-</span></p>

      <div id="event-cnt" style="color: #f60; font-weight: 700; font-size: 24px;">-</div>

      <canvas id="mycanvas" width="800" height="400"></canvas>

      <h2>Status</h2>
      <div id="statusline"></div>
   </body>
 </html>