Good evening!
I continued searching for the reason, why LNM does not show X-Plane-Multiplayer from the local connection. Communities like VATSIM have a whazzup-file to locate the other planes, but they only allow a reading frequency of 2 minutes. This is to long for monitoring co-flyers in visual flights (for example). Some weeks ago I asked Alex for the reason and he told me, that every plane, which is shown on the X-Plane-Map is also shown in LNM (and that's definitely right!).
I am using swift for multiplaying and multiplayers are not shown in X-Plane-map (they freeze, when swift starts). It's a pity, that momentary swift DOES NOT POPULATE datarefs in X-Plane (I asked Mat Sutcliffe), so any user, who wants to see his colleagues flying nearby in realtime will be disappointed. Continuous populating of datarefs by swift in X-Plane obviously causes occasional crashes...
Is there any other chance?