A NAN is interpreted in the FlightTaskAuto as a non-valid global coordinate and sets a local position.
If a zero is sent instead, the global coordinate is recognized as valid and will be executed.
This is a problem when the global position is gained for the first time after takeoff and that a valid global reference did not exist before
This change limits all mission items to the maximum flight altitude. The mission will still be executed and flown,
but the vehicle will never exceed the mission altitude. This ensures the vehicle can always reach the mission
items. Wether or not the entire mission should be rejected if it falls outside of the fenced area is enforced
in the mission feasibility checker function.
This change fixes a wrong behaviour when a takeoff command is sent.
An example:
- MIS_TAKEOFF_ALT set to 10 meters
- Takeoff command with alt setpoint of 2 meters
Old behaviour:
1. Climb to 10 meters -> takeoff WP reached
2. Go to setpoint at 2 meters
New behaviour:
1. Climb to 10 meters and stay there but notify that altitude was
overridden.
RomanBapst