I am now only using the editor in qt-creator and have not set up sdk knowingly.

If only "we" (as in not me obviously, but community) could help florent with his "starfish" / sfos client for Asteroid. It would be already killer to only have the limited functionality of AsteroidOSSync android client for sailfish.
Further, i have the strong feeling that Rockpool might be of great use while coding an sfos client as the sfos side, eg. collecting notifications and uploading stuff to the watch has already been catered.