use org\nagios\nsca\{NscaClient, NscaMessage, NscaProtocol};

$c= new NscaClient('nagios.example.com');
$c->connect();

$c->send(new NscaMessage(
  'ws.example.com', 
  'queue_check', 
  NscaProtocol::OK,
  'Up and running'
));
$c->send(new NscaMessage(
  'ws.example.com', 
  'queue_check', 
  NscaProtocol::ERROR,
  'No answer on port 80 after 2 seconds'
));

$c->close();