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mdns/zeroconf/bonjour service discovery add-on for node.js

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# mdns -- node.js Service Discovery

* Package: mdns
* Description: multicast DNS service discovery
* Installation: `npm install mdns` (see below)
* Documentation: [mdns user guide](http://agnat.github.io/node_mdns/user_guide.html)
* License: [MIT](http://github.com/agnat/node_mdns/blob/master/LICENSE)
* Donations: [![Flattr this git repository](http://api.flattr.com/button/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=agnat&url=https://github.com/agnat/node_mdns&title=node_mdns&tags=github&category=software)

mdns adds multicast DNS service discovery, also known as zeroconf or bonjour to Node.js. It provides an object based interface to announce and browse services on the local network.

## Synopsis

```js
// import the module
const mdns = require('mdns');

// advertise a http server on port 4321
const ad = mdns.createAdvertisement(mdns.tcp('http'), 4321);
ad.start();

// watch all http servers
const browser = mdns.createBrowser(mdns.tcp('http'));
browser.on('serviceUp', service => {
  console.log("service up: ", service);
});
browser.on('serviceDown', service => {
  console.log("service down: ", service);
});
browser.start();

// discover all available service types
const all_the_types = mdns.browseThemAll(); // all_the_types is just another browser...
```

## Installation

On Linux and other systems using the avahi daemon the avahi dns_sd compat library and its header files are required.  On debianesque systems the package name is `libavahi-compat-libdnssd-dev`, on fedoraesque systems the package is `avahi-compat-libdns_sd-devel`.  On other platforms Apple's [mDNSResponder](http://opensource.apple.com/tarballs/mDNSResponder/) is recommended. Care should be taken not to install more than one mDNS stack on a system.

On Windows you are going to need Apples "Bonjour SDK for Windows". You can download it either from [Apple](https://developer.apple.com/download/more/?=Bonjour%20SDK%20for%20Windows) (registration required) or various unofficial sources. Take your pick. After installing the SDK restart your computer and make sure the `BONJOUR_SDK_HOME` environment variable is set. You'll also need a compiler. Microsoft Visual Studio Express will do. On Windows node >=0.7.9 is required.

mdns is available as a npm package:

```sh
npm install mdns
```

If you want to play with the latest source code, here is a more manual approach:

```sh
git clone http://github.com/agnat/node_mdns
cd node_mdns
npm link && npm test
```

In case you want to run or even publish your package using the development version of mdns you may set the version field to a tarball URL:

```json
{ "name": "discomvobulator"
, "version": "0.0.1"
, "description": "covers all your discomvobulation needs"
, "dependencies":
  { "mdns": "https://github.com/agnat/node_mdns/tarball/master"
  }
}
```

## Documentation

See the [user guide](http://agnat.github.io/node_mdns/user_guide.html).

## Contributors

In random order:

* Orlando Vazquez ([orlandov](https://github.com/orlandov))
* Ryan Dahl ([ry](https://github.com/ry))
* Dominic Tarr ([dominictarr](https://github.com/dominictarr))
* Emil Stenqvist ([emilisto](https://github.com/emilisto))
* Toby Ealden ([TobyEalden](https://github.com/TobyEalden))
* Ron Korving ([ronkorving](https://github.com/ronkorving))
* Don Park ([donpark](https://github.com/donpark))
* Cong Liu ([ghostoy](https://github.com/ghostoy))
* Tian Zhang ([KhaosT](https://github.com/KhaosT))

Your name is missing on the list? Shame on me. Please open an issue.

## Bugs and Contributions

If you find a bug, please report it using the [issue tracker](http://github.com/agnat/node_mdns/issues).

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