eco-server/eco-server.js

A data driven, UDP streamed Arduino robot for the 2014 Robot Challenge in Vienna, Austria.

var util = require('util'),
	EE = require('events').EventEmitter,
	dgram = require('dgram');

var ecoBotServer = function(port) {

	var self = this,
		DBstate = false,
		buffer = '',
        jsObject = '';

	function init(ecoPort) {
		
		var server = dgram.createSocket("udp4");

		server.on("error", function (e) {
			buffer = '';
		});

		server.on("message", function (data, rinfo) {
			emitNewMessage(data);
		});

		server.bind(ecoPort);
	};

	function emitNewMessage(data) {
		buffer += data;
		var boundary = buffer.indexOf('|');
		while(boundary !== -1) {
			if (buffer.length > 1000) buffer = '';
			var input = buffer.substr(0, boundary);
			buffer = buffer.substr(boundary + 1);
			boundary = buffer.indexOf('|');

            try {
                jsObject = JSON.parse(input);
	    		self.emit('sensor', jsObject);
	    		
	    		nosql.insert(jsObject);
            } catch(e) {
                buffer = '';
            }
            
		}
	};

	init(port);
};

util.inherits(ecoBotServer, EE);
module.exports = ecoBotServer;