MQTT

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Testing with Mosquitto

Get a Broker

To test the MQTT driver you can use the mosquitto software.

Go to https://mosquitto.org/

Download (for Windows) the installer (follow the Binary ... Windows links or click https://mosquitto.org/files/ and click 'binary', 'win64' and the latest version.

Install this. There will be no Start menu addition, find the service in the Windows Services applet and start it.

If it fails to start, there is no log, so it's easier to run on the command line to find the problem.

• Open a CMD window as Administrator

• Set directory

cd C:\Program Files\mosquitto

• Start manually

mosquitto -v

• Review the output

You may need to edit the mosquitto.conf file, located in the

C:\Program Files\mosquitto

folder. Edit this using Administrator permissions.

You may also need to add a firewall rule to allow this port to be exposed beyond localhost.

Sending MQTT Messages - in JSON 'A' Format

Once the broker is running, you can use the mosquitto_pub utility to publish messages.

• Open a CMD window as Administrator

• Set directory

• Use commands like:

mosquitto_pub -h 127.0.0.1 -p 1883 -t "East/MyDevice1" -m "{""time"": 1597228825, ""Analog1"":12.7}"

• Note that the quote marks need to be escaped with ""

• Note that the / character in "East/MyDevice1" is a forward slash, used to separate parts of an MQTT topic

• You must supply a time value for the message to be processed, and this needs to be in range. You can get a timestamp for the current time by visiting this web site: https://www.epochconverter.com/

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