BMP3XX.detect

You're seeing just the function detect, go back to BMP3XX module for more information.
Link to this function

detect(bus_name, bus_address \\ 119)

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Specs

detect(binary(), bus_address()) :: {:ok, sensor_type()} | {:error, any()}

Detect the type of sensor that is located at the I2C address

If the sensor is a known BMP3XX sensor, the response will either contain :bmp388 or :bmp390. If the sensor does not report back that it is one of those two types of sensors the return value will contain the id value that was reported back form the sensor.

The bus address is likely going to be 0x77 (the default) or 0x76.