Return current global variable value
Example:
-- get GV3 (index = 2) from Flight mode 0 (FM0)
val = model.getGlobalVariable(2, 0)
index
zero based global variable index, use 0 for GV1, 8 for GV9flight_mode
Flight mode number (0 = FM0, 8 = FM8)
nil
requested global variable does not existnumber
current value of global variable
a simple warning or notice