add more nodejs instrumentation

index.html

@@ -3,13 +3,45 @@
     <script src="/socket.io/socket.io.js"></script>
     <script>
         var socket = io();
-        console.log("loaded socketio");
+        // console.log("loaded socketio");
+
+        // connect to socketio
         socket.on('connect', function(){
-            socket.send('hi');
+            // send connect message
+            socket.send('hi '+window.location);
+        });
+        window.onload = function(){
+            cons = document.getElementById("console");
+            // handle user input
+            cons.onsubmit = function(){
+                inp = document.getElementById("input")
+                scr = document.getElementById("screen")
+                // send input to socketio
+                socket.emit('data',inp.value);
+                // console.log(inp.value);
+                scr.value += "> "+inp.value+"\r";
+                scr.scrollTop = scr.scrollHeight;
+                inp.value = "";
+                return false;
+            };
+            scr = document.getElementById("screen")
+            scr.value = ""; // reset input onload
+            // log data from socket
             socket.on('data', function(data){
-                console.log(data);
+                // console.log(data);
+                scr.value += "< "+data+"\r";
+                scr.scrollTop = scr.scrollHeight;
             });
+            // log connect messages
+            socket.on('message', function(data){
+                console.log('message',window.location,data);
             });
+        };
     </script>
   </head>
+  <form id="console">
+    <textarea cols=80 rows=20 id="screen"></textarea><br/>
+    <input id="input" type="text" />
+    <input id="submit" type="button" value="Submit" />
+  </form>
 </html>

serial.js

@@ -14,7 +14,7 @@ server.listen(8080);
 // open the serial port. Change the name to the name of your port, just like in Processing and Arduino:
 const port = new SerialPort("/dev/ttyUSB0", { baudRate: 9600 });
 
-const parser = new Readline({ delimiter: '\r' });
+const parser = new Readline({ delimiter: '\r\n' });
 port.pipe(parser)
 
 // respond to web GET requests with the index.html page:
@@ -27,9 +27,18 @@ parser.on('data', line => console.log(`> ${line}`))
 
 // listen for new socket.io connections:
 io.on('connection', function (socket) {
-    parser.on('data', line => socket.emit('data', line))
+    // get data from serial and send it to socket
+    parser.on('data', line => {
+        socket.emit('data', line)
+    });
+    // get data from socket and send it to serial
+    socket.on('data', function (data) {
+        console.log('data', socket.conn.remoteAddress, data)
+        port.write(data+"\r") // we need to end each command with a CR
+    });
+    // send and log connect messages
+    socket.volatile.emit('message', "hi "+socket.conn.remoteAddress);
     socket.on('message', function (data) {
-        console.log(data)
+        console.log('message',socket.conn.remoteAddress,data)
-        port.write(data+'\r')
     });
 });