# PX4 ROS 2 Interface Library

<Badge type="tip" text="PX4 v1.15" /> <Badge type="warning" text="Experimental" />

:::warning Experimental
At the time of writing, parts of the PX4 ROS 2 Interface Library are experimental, and hence subject to change.
:::

The [PX4 ROS 2 Interface Library](https://github.com/Auterion/px4-ros2-interface-lib) is a C++ library that simplifies controlling and interacting with PX4 from ROS 2.

The library provides three high-level interfaces for developers:

1. The [Control Interface](./px4_ros2_control_interface.md) allows developers to create and dynamically register modes written using ROS 2.
   It provides classes for sending different types of setpoints, ranging from high-level navigation tasks all the way down to direct actuator controls.
2. The [Navigation Interface](./px4_ros2_navigation_interface.md) enables sending vehicle position estimates to PX4 from ROS 2 applications, such as a VIO system.
3. [Waypoint Missions](./px4_ros2_waypoint_missions.md) allows waypoint missions to run entirely in ROS 2.

## Installation in a ROS 2 Workspace

To get started using the library within an existing ROS 2 workspace:

1. Make sure you have a working [ROS 2 setup](../ros2/user_guide.md), with [`px4_msgs`](https://github.com/PX4/px4_msgs) in the ROS 2 workspace.
2. Clone the repository into the workspace:

   ```sh
   cd $ros_workspace/src
   git clone --recursive https://github.com/Auterion/px4-ros2-interface-lib
   ```

   ::: info
   To ensure compatibility, use the latest _main_ branches for PX4, _px4_msgs_ and the library.
   See also [here](https://github.com/Auterion/px4-ros2-interface-lib#compatibility-with-px4).
   :::

3. Build the workspace:

   ```sh
   cd ..
   colcon build
   source install/setup.bash
   ```

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## How to Use the Library
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## CI: Integration Tests

When opening a pull request to PX4, CI runs the library integration tests.
These test that mode registration, failsafes, and mode replacement, work as expected.

For more information see [PX4 ROS2 Interface Library Integration Testing](../test_and_ci/integration_testing_px4_ros2_interface.md).