implement syslog via websocket with 1k buffer

firmware/webdir/index.html

@@ -63,6 +63,16 @@
                 </div>
             </div>
         </article>
+        <article class="card">
+            <header>
+                <h3>Syslog</h3>
+            </header>
+            <div class="table">
+                <div class="row">
+                    <pre id="syslog"></pre>
+                </div>
+            </div>
+        </article>
 
     </section>
     <section id="dashboard">
@@ -181,6 +191,7 @@
 <script>
     var menu = document.getElementById("bmenub");
     var voltage = document.getElementById("out_voltage");
+    var syslog = document.getElementById("syslog");
 
     var unused_values = {};
 
@@ -209,7 +220,7 @@
         sbox = document.getElementById('status_box');
         sbox.className = "label " + cls;
         sbox.innerHTML = text;
-        console.log(text);
+        console.info(text);
     }
 
     function startPolling() {
@@ -253,6 +264,13 @@
             } else if (cmd === 'V') {
                 voltage.innerHTML = (val * 13 / 1024).toFixed(2);
                 series.append(new Date().getTime(), val);
+            } else if (cmd === 'L') {
+                var len = dv.getUint8(1);
+                var offset = dv.getUint16(2);
+                var str = "";
+                for (var i = 0; i < len; i++)
+                    str += dv.getChar(4 + i);
+                syslog.innerHTML = syslog.innerHTML.slice(0, offset) + str;
             } else
                 console.log('unknown command', cmd, val);
         }