Native setup

Setting up the simulation environment from scratch requires some effort, but results in the most performant setup, with less chance of driver issues.

Prerequisites: Ubuntu 18.04, native ROS installation.

Create a workspace for the simulation

Throughout this guide we will be using the catkin_ws as the workspace name. Feel free to change it in your setup. We will be creating it in the home directory of the current user (~).

Create the workspace and clone Clover sources:

mkdir -p ~/catkin_ws/src
cd ~/catkin_ws/src
git clone https://github.com/CopterExpress/clover
git clone https://github.com/CopterExpress/ros_led

Install all prerequisites using rosdep:

cd ~/catkin_ws
rosdep update
rosdep install --from-paths src --ignore-src -y

Get PX4 sources

PX4 will be built along with the other packages in our workspace. You may clone it directly into the workspace or put it somewhere and symlink to ~/catkin_ws/src. We will need to put its sitl_gazebo submodule in ~/catkin_ws/src as well. For simplicity's sake we will clone the firmware directly to the workspace:

cd ~/catkin_ws/src
git clone --recursive https://github.com/CopterExpress/Firmware -b v1.10.1-clever
ln -s Firmware/Tools/sitl_gazebo ./sitl_gazebo

Install PX4 prerequisites

PX4 comes with its own script for dependency installation. We may as well leverage it:

cd ~/catkin_ws/src/Firmware/Tools/setup
sudo ./ubuntu.sh

This will install everything required to build PX4 and its SITL environment.

You may want to skip installing the ARM toolchain if you're not planning on compiling PX4 for your flight controller. To do this, use the --no-nuttx flag:

sudo ./ubuntu.sh --no-nuttx

Patch Gazebo plugins

The sitl_gazebo package containing required Gazebo plugins needs patching due to recent changes in MAVLink. These patches are already preapplied in the virtual machine image and are stored in the VM repository. Run the following commands to download and apply the patches:

cd ~/catkin_ws/src/Firmware/Tools/sitl_gazebo  
wget https://raw.githubusercontent.com/CopterExpress/clover_vm/master/assets/patches/sitl_gazebo.patch  
patch -p1 < sitl_gazebo.patch
rm sitl_gazebo.patch

Install geographiclib datasets

mavros requires geographiclib datasets to be present:

cd ~
wget https://raw.githubusercontent.com/mavlink/mavros/6f5bd5a1a67c19c2e605f33de296b1b1be9d02fc/mavros/scripts/install_geographiclib_datasets.sh  
chmod +x ./install_geographiclib_datasets.sh
sudo ./install_geographiclib_datasets.sh
rm ./install_geographiclib_datasets.sh

Build the simulator

With all dependencies installed, you can build your workspace:

cd ~/catkin_ws
catkin_make

Some of the files - particularly Gazebo plugins - require large amounts of RAM to be built. You may wish to reduce the number of parallel jobs; the number of parallel jobs should be equal to the amount of RAM in gigabytes divided by 2 - so a 16GB machine should use no more than 8 jobs. You can specify the number of jobs using the -j flag: catkin_make -j8

Run the simulator

In order to be sure that everything was built correctly, try running the simulator for the first time:

source ~/catkin_ws/devel/setup.bash
roslaunch clover_simulation simulator.launch