Copy the sensorthings folder to the homeassistant custom_components folder (which sits in the config folder)
Restart Home Assistant
Use the Home Assistant GUI to add a new integration (settings → devices & services → add new integration). You should find the OGC SensorThings integration in the list.
Configuration only requires the base URL of the OGC SensorThings endpoint (including its version). e.g. https://ogc-demo.k8s.ilt-dmz.iosb.fraunhofer.de/v1.1 or https://sensors.bgs.ac.uk/FROST-Server/v1.1.
This integration uses MQTT to update the sensor values in Home Assistant.
This integration implements only part 1 of the standard (Sensing), and not part 2 (Tasking). It works for endpoints implementing either 1.0 part 1 or 1.1 part 1.
@IvanSanchez for the inspiration https://github.com/IvanSanchez/homeassistant-sensorthings