Hi all,
After some testing...
As it seems, and in one way or another emphasized in comments residing on the Github site, you should avoid a too small radius of the geofence.
Advise is to create a geofence of at least 500m or perhaps larger. The frequency of the location check isn't high (for the good reason to avoid high battery consumption).
Therefore entering and exitting a geofence can remain unnoticed. Other than that the notification works excellent.
Only thing left would be to trigger something like a webservice call to notify a server entering or exitting a geofence rather than displaying a notification on the mobile phone. Suggestions are welcome!!
Cheers,
Roeland