mosquitto_pub:tldr:f34db

The command you provided is a mosquitto_pub command, used to publish a message to a MQTT (Message Queuing Telemetry Transport) broker.

Here is an explanation of each part of the command:

• mosquitto_pub: Mosquitto is an open-source MQTT broker that facilitates communication between devices. mosquitto_pub is a command-line utility that allows publishing messages to an MQTT broker.
• -t ${sensors-temperature}: -t specifies the topic to which the message will be published. The ${sensors-temperature} is a placeholder that suggests a variable should be used to define the topic.
• -f ${data-txt}: -f is used to specify the file from which the message payload will be read. In this case, ${data-txt} suggests a variable that holds the path to a file with the message payload.

To use this command, you need to replace ${sensors-temperature} with the desired topic, and ${data-txt} with the path to the file containing the message payload. For example, you could run the command like this:

mosquitto_pub -t weather/temperature -f /path/to/data.txt

This would publish the contents of the data.txt file to the weather/temperature topic on an MQTT broker.