Since we regularly go swimming at one of Barcelonas beaches, I created this integration that fetches the official gencat api and is able to retrieve information such as jellyfish-alert, wind/wave info, waterquality and more and package that in a homeassistant device with entity sensors.
Feel free to give it a try if you happen to live here as well 
By no means is this integration in a sophisticated, well-tested, well thought trough state. It does the trick, for what I needed. If you find issues, let me know and Ill try to fix them.
