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mosquitto_pub

A simple MQTT version 3.1.1 client that will publish a single message on a topic and exit. More information: https://mosquitto.org/man/mosquitto_pub-1.html.

• Publish a temperature value of 32 on the topic sensors/temperature to 192.168.1.1 (defaults to localhost) with Quality of Service (QoS) set to 1:
   
  mosquitto_pub -h {{192.168.1.1}} -t {{sensors/temperature}} -m {{32}} -q {{1}}
   
• Publish timestamp and temperature data on the topic sensors/temperature to a remote host on a non-standard port:
   
  mosquitto_pub -h {{192.168.1.1}} -p {{1885}} -t {{sensors/temperature}} -m "{{1266193804 32}}"
   
• Publish light switch status and retain the message on the topic switches/kitchen_lights/status to a remote host because there may be a long period of time between light switch events:
   
  mosquitto_pub -r -h "{{iot.eclipse.org}}" -t {{switches/kitchen_lights/status}} -m "{{on}}"
   
• Send the contents of a file (data.txt) as a message and publish it to sensors/temperature topic:
   
  mosquitto_pub -t {{sensors/temperature}} -f {{data.txt}}
   
• Send the contents of a file (data.txt), by reading from stdin and send the entire input as a message and publish it to sensors/temperature topic:
   
  mosquitto_pub -t {{sensors/temperature}} -s < {{data.txt}}
   
• Read newline delimited data from stdin as a message and publish it to sensors/temperature topic:
   
  {{echo data.txt}} | mosquitto_pub -t {{sensors/temperature}} -l