49 lines
1.2 KiB
JavaScript
49 lines
1.2 KiB
JavaScript
var util = require('util');
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var events = require('events');
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var dgram = require('dgram');
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// ArtNet server class
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exports.listen = function(port, cb) {
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this.port = port;
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events.EventEmitter.call(this);
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// Set up the socket
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var sock = dgram.createSocket("udp4", function (msg, peer) {
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var data = new Array();
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for (i = 0; i < msg.length; i++) {
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var d = msg.toString().charCodeAt(i);
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// Since we can't do unsigned 8-bit integers, do some normalization
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if (d < 0) {
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d = 0;
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} else if (d > 255) {
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d = 255;
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}
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// Append the byte to the array
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data.push(d);
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}
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// Deseralize the data - magic numbers are as per the Art-Net protocol
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var sequence = data[12];
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var physical = data[13];
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var universe = (data[14] * 256) + data[15];
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var length = (data[16] * 256) + data[17];
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var rawData = new Array();
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for (i = 0; i < length; i++) {
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rawData.push(data[i + 18]);
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}
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// Build the associative array to return
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var retData = {sequence: sequence, physical: physical, universe: universe, length: length, data: rawData};
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// And call the callback passing the deseralized data
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cb(retData, peer);
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});
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sock.bind(port);
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}
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// Setup EventEmitter for the ArtNetServer
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util.inherits(this, events.EventEmitter);
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