###mdns Multicast DNS

####Some Examples:

Find all Amazon Fire TV devices on the local network:

1
2var Mdns = require('mdns-discovery');
3
4var mdns = new Mdns({
5    timeout: 4,
6    returnOnFirstFound: true,
7    name: '_amzn-wplay._tcp.local',
8    find: 'amzn.dmgr:'
9});
10mdns.run (function(res) {
11    res.forEach(enry) {
12       console.log(entry);
13    }
14});

List all mdns questions and answers for 10 seconds:

1var Mdns = require('mdns-discovery');
2
3var mdns = new Mdns({ timeout: 10 });
4mdns.on('packet', function (packets, rinfo) {
5    if (packets.answers) packets.answers.forEach(function(packet, i) {
6        console.log(`A: ${rinfo.address} - packet[${i}]=${packet.name}, type=${packet.type}, class=${packet.class}, ttl=${packet.ttl}}`);
7    });
8    if (packets.questions) packets.questions.forEach(function(packet, i) {
9        console.log(`Q: ${rinfo.address} - packet[${i}]=${packet.name}, type=${packet.type}, class=${packet.class}, ttl=${packet.ttl}}`);
10    });
11});
12mdns.run ();

Presence:

1var mdns = require('mdns-discovery')();
2
3mdns.onIP('192.168.1.31', function (packet, rinfo) {
4    if (packet.answers.length) {
5        console.log(rinfo.address + ' is present');
6    }
7}).run ();

Filter:

1var mdns = require('mdns-discovery')();
2
3var mdns = Mdns({
4    timeout: 3,
5    name: '_amzn-wplay._tcp.local',
6    find: 'amzn.dmgr:'
7});
8
9var allreadyUsed = [ {ip: '192.168.1.94'}, {ip: '192.168.1.91'} ];
10
11mdns.setFilter('ip', allreadyUsed).run (function(res) {
12    res.forEach(function(v) {
13        console.log(v);
14    });
15});