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• Mosqutto
  • Can be downloaded here.  Included in the link are instructions for various platforms.  Make sure in the end of installation the development libraries are available on your build path.
  • This is how one would do it in Ubuntu Linux 16.04
    
    • Enter the following commands:
      sudo apt-get update
      sudo apt-get install build-essential libssl-dev libc-ares-dev uuid-dev 
      mkdir ~/dev
      cd ~/dev
      wget http://mosquitto.org/files/source/mosquitto-1.4.10.tar.gz
      tar zxvf mosquitto-1.4.10.tar.gz
      cd mosquitto-1.4.10
      make
      sudo make install
      

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• • • sudo ldconfig
      

With the above steps completed, run the following commands to get the sparkplug library and sample application:
cd ~/dev
git clone https://github.com/Cirrus-Link/Sparkplug.git
cd Sparkplug/client_libraries/c/
make
cd ~/dev/Sparkplug/sparkplug_b/stand_alone_examples/c/udt_example/

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At this point the example.c file should be edited to properly reflect your MQTT server URL, port, credentials, etc.  Finally, build the application:
make

Now simply start the application with the following command: 
./example

At this point, the application will start, connect to the MQTT server, publish a Edge Node Birth Certificate, publish a Device Birth Certificate, and begin periodically reporting random data values to Ignition via MQTT Engine.  This can be verified via Ignition Designer.  Using a Web Browser, browse to the Ignition Gateway on your Ignition Gateway.  If it is running on your development machine, that is: http://localhost:8088.  You should see this: