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web: node app.js

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sudo npm install foreman -g
npm install foreman -g

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/**
 * Server Code
 */

var server = http.createServer(app).listen(app.get('port'), function(){
  console.log("Express server listening on port " + app.get('port'));
});

var io = require('socket.io').listen(server);

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io.sockets.on('connection', function(socket){
  console.log("Socket connected"); 
  socket.emit('connected', 123);

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/*
 * GET home page.
 */
var fs = require('fs')

exports.index = function(req, res){
  res.writeHead(200, {'Content-Type': 'text/html'});
  var contents = fs.readFileSync("./public/index.html", "UTF-8");
  res.end(contents);
//  res.render('index');

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 socket.on('sendSerial', function(data) {
    console.log("Client sent us: " + data + "to send to serial");
    sp.write(mbBuffer, function (err, bytesWritten) {
      console.log('bytes written:', bytesWritten);
    }); 

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  sp.on('data', function (data) {
    console.log(data);
    data = data.toString();
    socket.emit('receiveSerial', data);
  });

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/**
 * Serial Port Setup.
 */

var portName = '/dev/ttyAMA0'; //This is the standard Raspberry Pi Serial port

var readData = ''; //Array to hold the values read in from the port

var sp = new serialport(portName, {
  baudRate: 9600,

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serialport = require("serialport").SerialPort;

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io.sockets.on('connection', function(socket){
  console.log("Socket connected"); 
  socket.emit('connected', 123);</pre>