Just a question in between... the altitude I can read in the external_dll ist MSL messured, right? Any chance to get the AGL value?
And currently I am a bit fighting to call a c# DLL from the c++ extrernal_dll. Would be nice to get a common example for a managed code interface. I am not familiar with c++. Currently I try to make my c# dll com visible. But I haven't managed yet to call it from the c++ external dll. There are other possibilities to make such thing work, but they are even more "strange" for me.