I see two problems with your deploy settings: The chroot_index_file should point to a file and the deploy path should be prefixed with a slash. Try these changes:
set('chroot_index_file', 'web/index.php'); // The PHP index-file for Bedrock is inside the /web dir
host('xxx.xxx.xxx.xxx')
->user('xxxx')
->port('2020')
->set('deploy_path', '/httpdocs');
I also suggest you delete the .dep, releases and shared dirs in /httpdocs before trying to deploy again.