Tide calendar adapter for WebThings Gateway.
To configure the adapter, navigate to Settings -> Add-ons in the user interface and click the Configure button on the entry for this adapter.
Each station is a numeric station ID. You can find the station ID by searching on this website for the station closest to you.
This is the tide level unit you want, either feet (english) or meters (metric).
If you're running this add-on outside of the official gateway image for the Raspberry Pi, i.e. you're running on a development machine, you'll need to do the following (adapt as necessary for non-Ubuntu/Debian):
sudo pip3 install git+https://github.com/WebThingsIO/gateway-addon-python.git