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mosquitto_sub

A simple MQTT version 3.1.1 client that will subscribe to topics and print the messages that it receives. More information: https://mosquitto.org/man/mosquitto_sub-1.html.

• Subscribe to the topic sensors/temperature information with Quality of Service (QoS) set to 1. (The default hostname is localhost and port 1883):
   
  mosquitto_sub -t {{sensors/temperature}} -q {{1}}
   
• Subscribe to all broker status messages publishing on iot.eclipse.org port 1885 and print published messages verbosely:
   
  mosquitto_sub -v -h "iot.eclipse.org" -p 1885 -t {{\$SYS/#}}
   
• Subscribe to multiple topics matching a given pattern. (+ takes any metric name):
   
  mosquitto_sub -t {{sensors/machines/+/temperature/+}}