If you create a device instance in flespi - then, by design, it tries to read configuration settings from the tracker when it's connected.
Server sends only commands to read settings from the tracker.
Server never sends any commands that are capable to change device settings until you explicitly activate setting sending from SetBox or over API.
After all settings are read from the tracker, server doesn't send "get" commands any more.
I suggest you to choose device type Concox (concox) #16 for your device - it has only 2 configuration settings. Or you may simply use flespi at a channel level, without creating a device, in this case parsing will work correctly too.