nRFconnect on some android phones shows "This service is empty".

[Fanis]

I've recently jumped to nrf5 sdk v15.0 from v12.3 and met a problem in setting up a custom ble service. Actually the service itself is visible via nrfConnect andorid app, but half of the devices (which are by coincedence running Andorid 6) can't read the custom characteristics inside that service (app displays "This service is empty"). However with newer Android 7 phones everything is OK. I hadn't face this type of problem while working with old v12 sdk, and the full structure of my characteristics are visible everywhere. Does anybody knows the hint what be wrong here?

[Fanis]

The problem was related with base part of long UUID. Although some bytes were already changed, compared to standard registered UUIDs, for some phones it isn't enough. I've change few more and it all finally works.