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Opens an new Connection to an AMQP broker.

The connections created by this module are supervised under  amqp_client's supervision tree.
Please note that connections do not get restarted automatically by the supervision tree in
case of a failure. If you need robust connections and channels, use monitors on the returned
connection PID.

The connection parameters can be passed as a keyword list or as a AMQP URI.

When using a keyword list, the following options can be used:

# Options

  * `:username` - The name of a user registered with the broker (defaults to "guest");
  * `:password` - The password of user (defaults to "guest");
  * `:virtual_host` - The name of a virtual host in the broker (defaults to "/");
  * `:host` - The hostname of the broker (defaults to "localhost");
  * `:port` - The port the broker is listening on (defaults to `5672`);
  * `:channel_max` - The channel_max handshake parameter (defaults to `0`);
  * `:frame_max` - The frame_max handshake parameter (defaults to `0`);
  * `:heartbeat` - The hearbeat interval in seconds (defaults to `0` - turned off);
  * `:connection_timeout` - The connection timeout in milliseconds (defaults to `infinity`);
  * `:ssl_options` - Enable SSL by setting the location to cert files (defaults to `none`);
  * `:client_properties` - A list of extra client properties to be sent to the server, defaults to `[]`;
  * `:socket_options` - Extra socket options. These are appended to the default options.                         See and                         for descriptions of the available options.

## Enabling SSL

To enable SSL, supply the following in the `ssl_options` field:

  * `cacertfile` - Specifies the certificates of the root Certificate Authorities that we wish to implicitly trust;
  * `certfile` - The client's own certificate in PEM format;
  * `keyfile` - The client's private key in PEM format;

### Example

``` port: 5671,
                     ssl_options: [cacertfile: '/path/to/testca/cacert.pem',
                                   certfile: '/path/to/client/cert.pem',
                                   keyfile: '/path/to/client/key.pem',
                                   # only necessary with intermediate CAs
                                   # depth: 2,
                                   verify: :verify_peer,
                                   fail_if_no_peer_cert: true]

## Examples

    iex> host: "localhost", port: 5672, virtual_host: "/", username: "guest", password: "guest"
    {:ok, %AMQP.Connection{}}

    iex> "amqp://guest:guest@localhost"
    {:ok, %AMQP.Connection{}}
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