[docs] Add links for ArduPilot usage

docs/flight_controller.md

@@ -14,7 +14,8 @@ In "software-in-loop" simulation (SITL or SIL) mode the firmware runs in your co
 
 ## What Flight Controllers are Supported?
 
-AirSim has built-in flight controller called [simple_flight](simple_flight.md) and it is used by default. You don't need to do anything to use or configure it. AirSim also supports [PX4](px4_setup.md) as another flight controller for advanced users. In the future, we also plan to support [ROSFlight](https://rosflight.org/) and [Hackflight](https://github.com/simondlevy/hackflight).
+AirSim has built-in flight controller called [simple_flight](simple_flight.md) and it is used by default. You don't need to do anything to use or configure it. AirSim also supports [PX4](px4_setup.md) & [ArduPilot](https://ardupilot.org/dev/docs/sitl-with-airsim.html) as external flight controllers for advanced users.
+
+## Using AirSim Without Flight Controller
 
- ## Using AirSim Without Flight Controller
 Yes, now it's possible to use AirSim without flight controller. Please see the [instructions here](image_apis.md) for how to use so-called "Computer Vision" mode. If you don't need vehicle dynamics, we highly recommend using this mode.

mkdocs.yml

@@ -73,19 +73,23 @@ nav:
     - "Flight Controller": 'flight_controller.md'
     - "Simple Flight": 'simple_flight.md'
     - "Hello Drone": 'hello_drone.md'
-  - "MavLink and PX4":
-    - "PX4 Setup for AirSim": 'px4_setup.md'
-    - "PX4 in SITL": 'px4_sitl.md'
-    - "AirSim with Pixhawk": 'https://youtu.be/1oY8Qu5maQQ'
-    - "PX4 Setup with AirSim": 'https://youtu.be/HNWdYrtw3f0'
-    - "Debugging Attitude Estimation": 'https://www.youtube.com/watch?v=d_FyjKDWQfc&feature=youtu.be'
-    - "Intercepting MavLink Messages": 'https://github.com/Microsoft/AirSim/wiki/Intercepting-MavLink-messages'
-    - "Rapid Descent on PX4 Drones": 'https://github.com/Microsoft/AirSim/wiki/Rapid-Descent-on-PX4-drones'
-    - "Building PX4": "px4_build.md"
-    - "PX4/MavLink Logging": 'px4_logging.md'
-    - "MavLink LogViewer": "log_viewer.md"
-    - "MavLinkCom": 'mavlinkcom.md'
-    - "MavLink MoCap": 'mavlinkcom_mocap.md'
+  - "External Flight Controllers":
+    - "MavLink and PX4":
+      - "PX4 Setup for AirSim": 'px4_setup.md'
+      - "PX4 in SITL": 'px4_sitl.md'
+      - "AirSim with Pixhawk": 'https://youtu.be/1oY8Qu5maQQ'
+      - "PX4 Setup with AirSim": 'https://youtu.be/HNWdYrtw3f0'
+      - "Debugging Attitude Estimation": 'https://www.youtube.com/watch?v=d_FyjKDWQfc&feature=youtu.be'
+      - "Intercepting MavLink Messages": 'https://github.com/Microsoft/AirSim/wiki/Intercepting-MavLink-messages'
+      - "Rapid Descent on PX4 Drones": 'https://github.com/Microsoft/AirSim/wiki/Rapid-Descent-on-PX4-drones'
+      - "Building PX4": "px4_build.md"
+      - "PX4/MavLink Logging": 'px4_logging.md'
+      - "MavLink LogViewer": "log_viewer.md"
+      - "MavLinkCom": 'mavlinkcom.md'
+      - "MavLink MoCap": 'mavlinkcom_mocap.md'
+    - "ArduPilot":
+      - "ArduPilot SITL Setup": "https://ardupilot.org/dev/docs/building-the-code.html"
+      - "AirSim & ArduPilot": "https://ardupilot.org/dev/docs/sitl-with-airsim.html"
   - "Upgrading":
     - "Upgrading Unreal": 'unreal_upgrade.md'
     - "Upgrading APIs": 'upgrade_apis.md'