It actually works - no strings attached. Assumed that:
1) the WiFi on iPhone is on
2) iPhone and Mac are on same network (so that Bonjour magic can work)
3) the Mac Things is running when you start Things on iPhone
the synchronization happens automatically and is VERY fast (few seconds max).
Finally a portable GTD application that works for me :-).
Author Miro Adamy
License (c) 2006-2019 Miro Adamy