This example shows how you can use the SDK Action class to transition between VTOL copter and fixed-wing modes (and back).
The example must be run against a VTOL aircraft (simulated or otherwise). Otherwise the example is built and run in the standard way.
Instructions for running the Gazebo simulator for a standard VTOL can be found here: PX4 Development Guide > Gazebo Simulation. jMAVSim does not support VTOL simulation.
The example terminal output for a debug build of the SDK should be similar to that shown below (a release build will omit the "Debug" messages):
$ ./transition_vtol_fixed_wing udp://:14540
Waiting to discover system... [10:24:42|Info ] New system on: 127.0.0.1:14557 (udp_connection.cpp:210) [10:24:42|Debug] MAVLink: info: [logger] file: rootfs/fs/microsd/log/2017-11-21/0 (mavlink_system.cpp:286) [10:24:43|Debug] Discovered 4294967298 (mavlink_system.cpp:483) Discovered system with UUID: 4294967298 Arming... Taking off... [10:24:44|Debug] MAVLink: info: ARMED by arm/disarm component command (mavlink_system.cpp:286) [10:24:44|Debug] MAVLink: info: Using minimum takeoff altitude: 10.00 m (mavlink_system.cpp:286) [10:24:44|Debug] MAVLink: info: Takeoff detected (mavlink_system.cpp:286) [10:24:44|Debug] MAVLink: critical: Using minimum takeoff altitude: 10.00 m (mavlink_system.cpp:286) Altitude: 0.079 m Altitude: 0.507 m ... Altitude: 10.254 m Transition to fixedwing... Altitude: 10.263 m ... Altitude: 20.72 m Altitude: 24.616 m Altitude: 22.262 m Transition back to multicopter... Altitude: 17.083 m ... Return to launch... Altitude: 11.884 m [10:25:09|Debug] MAVLink: info: RTL: climb to 518 m (29 m above home) (mavlink_system.cpp:286) Altitude: 13.61 m ... Altitude: 27.489 m Altitude: 28.892 m [10:25:18|Debug] MAVLink: info: RTL: return at 517 m (29 m above home) (mavlink_system.cpp:286) Altitude: 29.326 m Altitude: 29.33 m ... Altitude: 29.323 m Altitude: 29.357 m Landing... [10:25:29|Debug] MAVLink: info: Landing at current position (mavlink_system.cpp:286) Altitude: 29.199 m Altitude: 28.722 m Altitude: 28.189 m Altitude: 27.62 m Finished...
The operation of the transition code is discussed in the guide: Takeoff and Landing (and other actions).