Allow listening to all interfaces instead of just localhost

[eventengineering]

When specifying no interface, use nil to allow for listening on all interfaces instead of just localhost.

[phillbaker]

Hm, can you give some more context here? If it's listening on all interfaces is than an unexpected change in the library?

[eventengineering]

Documentation states if no interface (host) specified, then listen to all (often represented by "0.0.0.0")

If host is omitted, the server will accept connections on the unspecified IPv6 address (::) when IPv6 is available, or the unspecified IPv4 address (0.0.0.0) otherwise.
Net server listen

"localhost" is not the same as "0.0.0.0"

You may also use the special strings “localhost” or “loopback” to specify that the socket only accept connections from the local machine.
GCDAsyncSocket

In order to represent "0.0.0.0" correctly, it should be set to nil

To accept connections on any interface pass nil
GCDAsyncSocket

[phillbaker]

Thanks!