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