Another vote for Vince’s code at https://github.com/vinceskahan/weatherflow-udp-listener as it’s already got MQTT built-in.
If you just want simple Python code to decode UDP stuff, you can pull that out of my Redis database code at http://dotnetdotcom.net/WeatherFlow.py
And I really like Pete Davis’ WeatherFlow P{iy}Console at WeatherFlow PiConsole as a turn-key solution for display purposes. If I had an infinite amount of time I’d probably try to figure out how to integrate my UDP code into it and do some datalogging on that Pi so it would continue working when the internet was down…