I doubt that this is specific to the Thing from Sparkfun I mention it just in case.
I’ve found that when I add a switch in the android app that controls the LED pin (5), the switch shows a reversed status. When the LED is on, the switch shows that it’s off and vice versa.
the LED is wired that way (actually on a few boards like the ESP12E as well) so it allows you to share the pin as a button input as well as an LED output.