Installation withoud a homekit HUB/bridge
First thing to do:
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In HomeAssistant INSTALL the HomeBridge integration.
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After this is complete install the Homekit Controller integration and connect with the code from homebridge integration (HASS Bridge xxxxx)
When this is completed go to install the FP2 sensor with the Aqara app.
After the installation of the FP2 sensor is completed you get a new discover device in HomeAssistant that you can connect (code is on back of sensor)
other link