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node-red/nodes/io/32-udp.js

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/**
* Copyright 2013 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
var RED = require("../../red/red");
var dgram = require('dgram');
// The Input Node
function UDPin(n) {
RED.nodes.createNode(this,n);
this.group = n.group;
this.port = n.port;
this.host = n.host || null;
this.datatype = n.datatype;
this.iface = n.iface || null;
this.multicast = n.multicast;
var node = this;
var server = dgram.createSocket('udp4');
server.on("error", function (err) {
console.log("udp listener error:\n" + err.stack);
server.close();
});
server.on('message', function (message, remote) {
var msg;
if (node.datatype =="base64") { msg = { payload:message.toString('base64'), fromip:remote.address+':'+remote.port }; }
else if (node.datatype =="utf8") { msg = { payload:message.toString('utf8'), fromip:remote.address+':'+remote.port }; }
else { msg = { payload:message, fromip:remote.address+':'+remote.port }; }
node.send(msg);
});
server.on('listening', function () {
var address = server.address();
node.log('udp listener at ' + address.address + ":" + address.port);
if (node.multicast == "true") {
server.setBroadcast(true)
server.setMulticastTTL(128);
server.addMembership(node.group,node.iface);
node.log("udp multicast group "+node.group);
}
});
node.on("close", function() {
try {
server.close();
node.log('udp listener stopped');
}
catch (err) { console.log(err); }
});
server.bind(node.port,node.host);
}
RED.nodes.registerType("udp in",UDPin);
// The Output Node
function UDPout(n) {
RED.nodes.createNode(this,n);
//this.group = n.group;
this.port = n.port;
this.base64 = n.base64;
this.addr = n.addr;
this.iface = n.iface || null;
this.multicast = n.multicast;
var node = this;
var sock = dgram.createSocket('udp4'); // only use ipv4 for now
sock.bind(node.port); // have to bind before you can enable broadcast...
if (this.multicast != "false") {
sock.setBroadcast(true); // turn on broadcast
if (this.multicast == "multi") {
sock.setMulticastTTL(128);
sock.addMembership(node.addr,node.iface); // Add to the multicast group
node.log('udp multicast ready : '+node.addr+":"+node.port);
}
else node.log('udp broadcast ready : '+node.addr+":"+node.port);
}
else node.log('udp ready : '+node.addr+":"+node.port);
node.on("input", function(msg) {
if (msg.payload != null) {
//console.log("UDP:",msg.payload);
var message;
if (node.base64) { message = new Buffer(b64string, 'base64'); }
else { message = new Buffer(""+msg.payload); }
console.log("UDP send :",node.addr,node.port);
sock.send(message, 0, message.length, node.port, node.addr, function(err, bytes) {
if (err) node.error("udp : "+err);
});
}
});
node.on("close", function() {
try {
sock.close();
node.log('udp output stopped');
}
catch (err) { console.log(err); }
});
}
RED.nodes.registerType("udp out",UDPout);