Many thanks for this input, it is now working like intended. Since this little project is my first contact with POE please allow some more noobish questions:
The rest of the code tracks wheels by their IDs. It might be more consistent and easier overall to pass the wheel ID instead of the reference. For example, if something destroys the object (deletes the wheel), the ID to object lookup will detect that it's gone away.
Do you mean to rather use 
         on_connect => sub {
            # Begin interacting with the server.
            my ( $kernel, $client_socket ) = @_[KERNEL, ARG0 ];
            $_[HEAP]{client}  = POE::Wheel::ReadWrite->new(
                Handle     => $client_socket,
                InputEvent => "on_receive_data",
                ErrorEvent => "on_connect_error",
            );

            $_[HEAP]{client}->put( "login monitor monitor", "log on", 
+);
            $kernel->yield( 'keepalive', $_[HEAP]{client} );
        },

[download]
instead of passing it to the variable $io_wheel?

And in the same context, would you please be so kind as to elaborate following difference:

$kernel->yield( 'keepalive', $_[HEAP]{client} );
is used to address the ReadWrite instance.

In the sub "on_connect_error" (see first post) following code is used to delete the wheel upon an error:

delete $_[HEAP]{client}{$wheel_id};
I don't understand the difference between these two. Still struggling with a lot aspects in POE and I appreciate each input.

In reply to Re^2: POE yield not working by SoulStyle
in thread POE yield not working by SoulStyle

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