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File: //usr/lib/firewalld/services/mqtt-tls.xml

<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>mqtt-tls</short>
  <description>The Message Queuing Telemetry Transport (MQTT) is a machine-to-machine connectivity protocol. This variant of the protocol uses TLS encryption.</description>
  <port port="8883" protocol="tcp"/>
</service>