tldr/pages/common/mosquitto_pub.md

mosquitto_pub

A simple MQTT version 3.1.1 client that will publish a single message on a topic and exit.

• 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