FlightPlan!
Program a flight plan for your Tello drone. Check out Reefwing Software's new FREE app - FlightPlan! on the Apple App Store - https://apps.apple.com/us/app/flightplan/id1466581760…
There is also an article about how to write your own version of this app on Medium - https://medium.com/@reefwing/programming-the-tello-drone-using-swift-f9122fd4aeb8