Doesn't support anonymous FTP

[parsley72]

I've tried:

FTPClient *client = [FTPClient clientWithHost:@"localhost" port:21 username:@"" password:@""];

and:

FTPClient *client = [FTPClient clientWithHost:@"localhost"port:21 username:nil password:nil];

but neither of these appear to work. Are anonymous servers supported?

[parsley72]

Ah, this works:

FTPClient *client = [FTPClient clientWithHost:@"localhost" port:21 username:@"anonymous" password:@""];

Would be good to hardcode the username "anonymous" if nil is passed then mention this in the readme.