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  # Non-blocking
  $api->command('/ip/address/print' => sub {
      my ($api, $err, $list) = @_;

      return if $err;

      for (@$list) {...}
  });

  # Omit attributes
  $api->command('/user/print', undef, {name => 'admin'} => sub {...});

  # Errors handling
  $list = $api->command('/random/command');
  if (my $err = $api->error) {
      die "Error: $err, category: " . $list->[0]{category};
  }

Executes a command on a remote host and returns L<Mojo::Collection> with hashrefs
containing elements returned by a host. You can append a callback for non-blocking
calls.

In a case of error it may return extra attributes to C<!trap> or C<!fatal> API
replies in addition to error messages in an L</error> attribute or an C<$err>
argument. You should never rely on defines of the result to catch errors.

For a query syntax refer to L<API::MikroTik::Query>.

=head2 command_p

  my $promise = $api->command_p('/interface/print');

  $promise->then(
  sub {
      my $res = shift;
      ...
  })->catch(sub {
      my ($err, $attr) = @_;
  });

Same as L</command>, but always performs requests non-blocking and returns a
L<Mojo::Promise> object instead of accepting a callback. L<Mojolicious> v7.54+ is
required for promises functionality.

=head2 subscribe

  my $tag = $api->subscribe('/ping',
      {address => '127.0.0.1'} => sub {
        my ($api, $err, $res) = @_;
      });

  Mojo::IOLoop->timer(
      3 => sub { $api->cancel($tag) }
  );

Subscribe to an output of commands with continuous responses such as C<listen> or
C<ping>. Should be terminated with L</cancel>.

=head1 DEBUGGING

You can set the API_MIKROTIK_DEBUG environment variable to get some debug output
printed to stderr.

Also, you can change connection timeout with the API_MIKROTIK_CONNTIMEOUT variable.

=head1 COPYRIGHT AND LICENSE

Andre Parker, 2017-2018.

This program is free software, you can redistribute it and/or modify it under
the terms of the Artistic License version 2.0.

=head1 SEE ALSO

L<https://wiki.mikrotik.com/wiki/Manual:API>, L<https://github.com/anparker/api-mikrotik>

=cut