OK, One addition:
I found that, while I was able to get the string on the screen, I wasn’t able to get it into my returnedDataString variable (which I also noticed was miswritten as LMSreturnedDataString). I’m sure this isn’t the best solution (as a matter of fact, I know I’m going to get yelled at for doing it this way), but I added a global variable in the C++ body (above Comm_GetStringFromJS()) with the line:
FString returnedStringHold_Global;
Then I added a line in the extern “C” function to move the string into it:
returnedStringHold_Global = convertedString;
And, finally, I added a line in Comm_GetStringFromJS() to move it into the final, blueprint-accessible, destination:
LMSReturnedDataString = returnedStringHold_Global;
NOW everything is happy! 