The reason the first call works is that you're passing parameters in your yield() call.

  ...
  $kernel->yield('keepalive', $io_wheel, $kernel);
  ....
[download]

The keepalive callback collects those parameters here:

  ...
  keepalive => sub {
    my ( $io_wheel, $kernel ) = @_[ ARG0, ARG1 ];
  ....
[download]

The problem is that you're not continuing to pass those parameters in the delay. This might work better:

  keepalive => sub {
      my ( $io_wheel, $kernel ) = @_[ ARG0, KERNEL ];
      $io_wheel->put( "keepalive" );
      $kernel->delay( 'keepalive' => 10, $io_wheel );
  },
[download]

Notes:

• You don't need to pass a POE::Kernel reference through, since that's given to you for free in every callback. I've removed it from delay(), and you should remove it from yield().
• 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.

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