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$ pwd: /proc/self/root/proc/self/root/usr/lib/firewalld/services/
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File: //proc/self/root/proc/self/root/usr/lib/firewalld/services/mqtt.xml
<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>mqtt</short>
  <description>The Message Queuing Telemetry Transport (MQTT) is a machine-to-machine connectivity protocol. This variant of the protocol is unencrypted.</description>
  <port port="1883" protocol="tcp"/>
</service>
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