Upon installing beta 3.14 I learned that the 'radar' connection to the Varia RTL515 was lost and I had to 'reconnect' (is a setting option).
After upgrading to beta 3.19 the connection was lost again and I 'reconnect'ed once more.
I noticed that connecting the light/radar was not very stable so I decided to uninstall the Varia RTL515 and reinstall the light/radar again.
I have the impression that uninstalling/reinstalling the RTL515 restored the building of a stable light network and radar function between the Edge 1030+ and RTL515.