Update cheatsheets

mosquitto_pub

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# 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`