For all who did not do it yet,
Please configure a personalized security password for your hotspots !
Read this post about the why and the how (and how to set it in OpenSpot, Pi-Star and Blue-DV
WARNING: as of september, it wil be mandatory to enable you hotspot password. If you forget to do that, your hotspot will not be able to connect to the master server because the default password will not be valid any more !