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node-red-nodes/io/mdns/README.md

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node-red-node-discover
======================
A <a href="http://nodered.org" target="_new">Node-RED</a> node that uses Bonjour
/ Avahi to discover local network services such as iTunes libraries, printers, etc.
Prerequisites
-------------
please read the [install instructions](https://www.npmjs.com/package/mdns) for the underlying npm.
For Debian / Ubuntu this requires installing
sudo apt-get install libavahi-compat-libdnssd-dev
Install
-------
Run the following command in the root directory of your Node-RED install
npm install node-red-node-discover
Usage
-----
Uses a javascript implenetation of mdns ( mdns-js ) to provide a Bonjour / Avahi
service discovery capability.
**msg.payload** contains the service object on both arrival and leaving.
**msg.state** contains boolean true or false depending if the service has arrived (true) or gone away (false)..
Within the msg.payload object the most interesting things are:
* msg.payload.name
* msg.payload.interface
* msg.payload.port
* msg.payload.addresses
* msg.payload.txtRecord
For a full list of official service types see [this list](http://www.dns-sd.org/ServiceTypes.html" target="_new).
**Note**: When Node-RED starts you will get a big WARNING message about the Bonjour compatability layer... this is just a warning so don't worry.