Sets current global variable value. See also model.getGlobalVariable()
index
zero based global variable index, use 0 for GV1, 8 for GV9
flight_mode
Flight mode number (0 = FM0, 8 = FM8)
value
new value for global variable. Permitted range is from -1024 to 1024.
none
Global variable can only store integer values, any floating point value is converted into integer value by truncating everything behind a floating point.