LoggerMulticastBackend
======================

A backend for `Logger` that delivers messages over multicast UDP.

Designed for headless embedded applications, it allows watching the log over the local network.

## Easy Defaults

In your logger config, simply do something like this:

```elixir
config :logger,
        backends: [ :console, LoggerMulticastBackend ],
        level: :debug,
        format: "$time $metadata[$level] $message\n"
```

or, at runtime, you can add this to your current config...

```elixir
Logger.add_backend LoggerMulticastBackend
```  

Now, you'll have logging messages sent out on the default target multicast address, which is 224.0.0.224:9999.   

## Custom Configuration

Don't like the default multicast target or format? change it by replacing `LoggerMulticastBackend` in the above examples with a tuple including options something like this:

```elixir
config :logger, backends: [
  :console,
  {LoggerMulticastBackend,
    target: {{224,1,22,223}, 4252},
    level:  :info}
]
```

The full range of custom configuration options in the tuple are as follows:

- __target__ - a tuple of the target unicast or multicast address and port, like {{241,0,0,3}, 52209}

- __level__ - the level to be logged by this backend. Note that messages are first filtered by the general level configuration in :logger

- __format__ - the format message used to print logs.
Defaults to: ``"$time $metadata[$level] $levelpad$message\n"``

- __metadata__ - the metadata to be printed by $metadata.
Defaults to an empty list (no metadata)