you can use this function in xf2
function xf2AutoPost($user_id, $node_id, $title, $message)
{
$dir = __DIR__;
require($dir . '/src/XF.php');
XF::start($dir);
$user = \XF::em()->find('XF:User', $user_id);
$user = \XF::em()->find('XF:Forum', $node_id)...