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server.js
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server.js
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var express = require('express'); // web server application
var app = express(); // webapp
var http = require('http').Server(app); // connects http library to server
var io = require('socket.io')(http); // connect websocket library to server
var serverPort = 8000;
var serialPort = require('serialport'); // serial library
var readLine = serialPort.parsers.Readline; // read serial data as lines
//---------------------- WEBAPP SERVER SETUP ---------------------------------//
// use express to create the simple webapp
app.use(express.static('public')); // find pages in public directory
// start the server and say what port it is on
http.listen(serverPort, function() {
console.log('listening on *:%s', serverPort);
});
//----------------------------------------------------------------------------//
//---------------------- SERIAL COMMUNICATION --------------------------------//
// start the serial port connection and read on newlines
const serial = new serialPort('/dev/ttyUSB0', {
baudRate:115200
});
const parser = new readLine({
delimiter: '\r\n'
});
// Read data that is available on the serial port and send it to the websocket
serial.pipe(parser);
parser.on('data', function(data) { // on data from the arduino
if(data=='rst'){ // if its the 'rst' string call reset
io.emit('reset');
}else{ // any other data we try to forward by spliting it
var transmitData = [data.split(',')[0],data.split(',')[1]];
io.emit('new-pos', transmitData);
}
});
//----------------------------------------------------------------------------//
//---------------------- WEBSOCKET COMMUNICATION -----------------------------//
// this is the websocket event handler and say if someone connects
// as long as someone is connected, listen for messages
io.on('connect', function(socket) {
console.log('a user connected');
io.emit('reset'); // call reset to make sure the website is clean
// if you get the 'disconnect' message, say the user disconnected
io.on('disconnect', function() {
console.log('user disconnected');
});
});