Sorry for the slow reply. This is entirely my fault. The email alerts were not getting to me.
But I should have checked anyway.
As you guessed, it's an indoor sensor. We didn't intend it that way, it's just physics.
The sensor outputs an eye-safe laser light. If you could see it, it would be about as bright as a common Red LED on must electronics.
Outdoors we go up against the sun. Which generates a ton of 940nm light. (Oddly, there is not as much 940nm as the visible frequencies, but still a lot.)
And all that light looks to the sensor like noise.
When the signal to noise ratio goes too low, we cannot get an answer.
The drone landing works because the sensor is pointed down - away from the sun.
You will also see the sensor works in the shade of a building.
But in sunlight, with any direct light we cannot give an answer.
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