port	protocol	bind_scope	allowed_sources	purpose
1883	tcp	node-ip	nginx01,nginx02,approved-management	MQTT
8083	tcp	node-ip	nginx01,nginx02,approved-management	MQTT WebSocket
18083	tcp	node-ip	management	Dashboard
4370	tcp	node-ip	emqx01,emqx02,emqx03	Erlang distribution
5370	tcp	node-ip	emqx01,emqx02,emqx03	cluster RPC