[
 {rabbit, [
{% if rabbitmq_listeners is not defined %}
   {tcp_listeners, [{{ rabbitmq_listen_port }}]}
{% elif rabbitmq_listeners is defined %}
   {tcp_listeners, [{% for item in rabbitmq_listeners %}{"{{ item }}", {{ rabbitmq_listen_port }}}{% if not loop.last %}, {% endif %}{% endfor %}]}
{% endif %}
  ]}
].