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ROS 2 based robot learning platform

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# ROSBOT

ROS 2 based robot learning platform.

[![ROSBOT introductory video](https://raw.githubusercontent.com/kallaspriit/rosbot/main/docs/render.jpg)](https://www.youtube.com/watch?v=t-1GAfGHRLs)

_Click the image to video showing robot design and navigation in action_

## Bill of Materials

The BOM has not been designed for easy replication but most all used components and alternatives considered are there with respective links of where were they purchased so maybe it helps someone putting together a similar build :)

[![Bill of materials](https://raw.githubusercontent.com/kallaspriit/rosbot/main/docs/bom.jpg)](https://docs.google.com/spreadsheets/d/122i1k6gkCbc3--f4KSbXqv0-GW25-VVfwCtphQCVFGo/edit?usp=sharing)

_Click the image to open BOM_

## Run main rosbot/ros workspace

**Disclaimer**

_The following documentation is various commands and information that I've written over the time the robot was in development and everything is not up to date or relevant but maybe it helps someone._

- Add user to usb serial and input groups
  - `sudo usermod -a -G input ubuntu`
  - `sudo usermod -a -G dialout ubuntu`
  - `sudo usermod -a -G tty ubuntu`
- Build rosbot (on both the robot and the remote PC)
  - `cd ~/rosbot/ros` to open workspace
  - `rosdep install -i --from-path src --rosdistro foxy -y` to install dependencies
  - `git pull && colcon build` to pull changes and build workspace
- Launch rosbot on the robot
  - First build it if there have been any changes
  - Open new terminal
  - `cd ~/rosbot/ros` to open workspace
  - `. install/local_setup.bash` to load workspace overlay (on both robot and remote pc)
  - `ros2 launch odrive_bringup rosbot.launch.py` to launch rosbot (run on robot)
  - `ros2 launch odrive_bringup rviz.launch.py` to launch rviz (run on remote pc)
- Run joystick teleop
  - Open new terminal
  - `. install/local_setup.bash` to load workspace overlay
  - `ros2 launch teleop_twist_joy teleop.launch.py joy_config:='rosbot_xbox_bluetooth' cmd_vel:=/diff_drive_controller/cmd_vel_unstamped` to launch joystick teleop
  - Hold down left trigger (button 6) and use left and right joysticks to control speed and rotation
  - Hold down right trigger (button 7) for boost (faster movements)
- Launch odrive manual control (for testing only)
  - Open new terminal
  - `. install/local_setup.bash` to load workspace overlay
  - `ros2 launch odrive_bringup odrive.launch.py` to launch odrive test ()
  - `ros2 topic pub -r 100 /left_wheel_joint_velocity_controller/commands std_msgs/Float64MultiArray "data: [1]"`
  - `ros2 topic pub -r 100 /right_wheel_joint_velocity_controller/commands std_msgs/Float64MultiArray "data: [-1]"`
  - `ros2 launch teleop_twist_joy teleop.launch.py joy_config:='rosbot_xbox_bluetooth' cmd_vel:=/diff_drive_controller/cmd_vel_unstamped` to launch joystick teleop
  - Hold down left trigger (button 6) and use left and right joysticks to control speed and rotation
- Launch usb xbox joystick teleop that publishes to `/cmd_vel`
  - `ros2 launch teleop_twist_joy teleop.launch.py cmd_vel:=cmd_vel joy_config:=rosbot_xbox_usb`

## Debugging

- Debugging
- `ros2 topic echo /joint_states` to show joint states including velocity etc
- `ros2 topic echo /dynamic_joint_states` to show dynamic joint states including axis error etc
- `ros2 run tf2_tools view_frames.py` to generate `frames.pdf` frame tree
- `rqt` to open RQT, add plugins such as `Topics > Topic Monitor`
- `ros2 run xacro xacro ./src/rosbot_description/urdf/rosbot.urdf.xacro` to debug what's wrong with URDF file
- `ros2 run tf2_ros tf2_echo odom base_link` to verify transforms from odom to base_link
  - At time 1634580767.596875940
    - Translation: [6.986, -2.328, 0.000]
    - Rotation: in Quaternion [0.000, 0.000, -0.210, 0.978]
  - At time 1634580768.594622939
    - Translation: [7.108, -2.383, 0.000]
    - Rotation: in Quaternion [0.000, 0.000, -0.213, 0.977]

## Joystick teleop

- https://index.ros.org/p/teleop_twist_joy/github-ros2-teleop_twist_joy/
- https://github.com/ros2/teleop_twist_joy/tree/foxy/
- http://wiki.ros.org/joy
- https://github.com/medusalix/xow need xow to use xbox bluetooth controller
- Configure XOW to use xbox controller over bluetooth
  - `sudo apt install cabextract` to install dependencies
  - `git clone https://github.com/medusalix/xow`
  - `cd xow`
  - `make BUILD=RELEASE`
  - `sudo make install`
  - `sudo systemctl enable xow`
  - `sudo systemctl start xow`
  - `sudo systemctl kill -s SIGUSR1 xow` to enable XOW pairing mode (generally not needed)
- Disable ERTM
  - `sudoedit /sys/module/bluetooth/parameters/disable_ertm`
  - replace `N` with `Y`
  - reboot
- Restart bluetooth
  - `sudo service bluetooth restart`
  - `sudo rmmod btusb`
- Test controller
  - `jstest /dev/input/js0`
- Also disable ERTM permanently
  - https://www.addictivetips.com/ubuntu-linux-tips/xbox-one-controllers-over-bluetooth-linux/
  - `sudo apt install dkms git linux-headers-`uname -r``
  - `git clone https://github.com/atar-axis/xpadneo.git`
  - `cd xpadneo`
  - `sudo ./install.sh`
  - reboot
- Disable internal bluetooth when using dongle
  - `sudoedit /boot/firmware/usrcfg.txt`
  - add line `dtoverlay=disable-bluetooth`
  - reboot
  - check with `hciconfig -a` and `hcitool dev`
  - does not seem to actually work..
- Connect to bluetooth xbox controller using terminal (on robot)
  - https://simpleit.rocks/linux/shell/connect-to-bluetooth-from-cli/
  - https://raspberrypi.stackexchange.com/questions/114586/rpi-4b-bluetooth-unavailable-on-ubuntu-20-04
  - https://www.makeuseof.com/manage-bluetooth-linux-with-bluetoothctl/
  - `sudo apt install bluez pi-bluetooth joystick`
  - Append "include btcfg.txt" to `sudoedit /boot/firmware/usrcfg.txt`
  - reboot
  - `hciconfig -a` or `hcitool dev` (from bluez) to check for bluetooth devices
  - `bluetoothctl` to run interactive bluetooth controller
  - `scan on`
  - wait for xbox controller (make it pair by holding the pair button, starts to blink rapidly)
  - `trust XX:XX:XX:XX:XX:XX` to trust the controller
  - `connect XX:XX:XX:XX:XX:XX` to connect to the controller
  - `sudo chmod a+rw /dev/input/js0` to give everyone read-write permissions to joystick
  - `sudo chmod a+rw /dev/input/event4` to give everyone read-write permissions to joystick (sometimes it's one of eventX)
- If the joystick `/dev/input/eventX` does not have correct permissions then (this does not seem to actually work)
  - `sudo apt install input-utils` to install `lsinput` tool
  - `sudo lsinput` to get list of inputs, note the vendor and product of "Xbox Wireless Controller"
  - `sudoedit 80-xbox-controller.rules`
  - add `KERNEL=="event*", ATTRS{idProduct}=="02e0", ATTRS{idVendor}=="045e", MODE="0666"` etc that mathes vendor and product
- Test joystick from terminal
  - `sudo apt install joystick`
  - `jstest /dev/input/js0`
  - `ros2 run joy joy_enumerate_devices`
- Test joystick visually
  - `sudo apt install jstest-gtk`
  - `jstest-gtk`
- Test joystick messages
  - `ros2 topic echo /joy`
  - `ros2 topic echo /cmd_vel`
  - `ros2 topic echo /diff_drive_controller/cmd_vel_unstamped`

## Setup Gazebo simulator

- `sudo apt install ros-foxy-gazebo-ros-pkgs`

## Setup Raspberry PI UART

- https://askubuntu.com/questions/1254376/enable-uart-communication-on-pi4-ubuntu-20-04
- Create boot configuration backups
  - `cd /boot/firmware`
  - `sudo cp usrcfg.txt usrconfig.backup.txt`
  - `sudo cp cmdline.txt cmdline.backup.txt`
- Disable console UART
  - add `enable_uart=0` to `/boot/firmware/usrcfg.txt`
  - remove `console=serial0,115200` from `/boot/firmware/cmdline.txt`
- Disable the Serial Service which used the miniUART
  - `sudo systemctl stop serial-getty@ttyS0.service`
  - `sudo systemctl disable serial-getty@ttyS0.service`
  - `sudo systemctl mask serial-getty@ttyS0.service`
- UART Pins
  - Pin 8 TXD GPIO14
  - Pin 10 RXD GPIO15

## Setup ROS2 Navigation2 Nav2

- https://navigation.ros.org/getting_started/index.html
- Install dependencies
  - `sudo apt install ros-foxy-navigation2 ros-foxy-nav2-bringup ros-foxy-cartographer ros-foxy-cartographer-ros ros-foxy-robot-localization ros-foxy-slam-toolbox ros-foxy-gazebo-ros-pkgs ros-foxy-xacro ros-foxy-slam-toolbox`
  - `sudo apt install ros-foxy-turtlebot3*` for testing on remote pc only
- Slam toolbox on the robot
  - Use snap `slam-toolbox`
  - It has optimizations in it that make it about 10x faster
- Run mapping and navigation
  - `ros2 launch slam_toolbox online_async_launch.py` to launch slam toolbox mapper
  - `ros2 launch nav2_bringup navigation_launch.py` to run navigation2

## Run navigation2_tutorials

- Clone and build `https://github.com/ros-planning/navigation2_tutorials.git`
- launch robot `ros2 launch sam_bot_description display.launch.py`
- Launch usbteleop
  - Open new terminal
  - `cd ~/rosbot/ros`
  - `. install/local_setup.bash`
  - `ros2 launch teleop_twist_joy teleop.launch.py cmd_vel:=/demo/cmd_vel joy_config:=rosbot_xbox_usb`
  - or without the /demo in modified version
- Launch slam_toolbox
  - Open new terminal
  - `ros2 launch slam_toolbox online_async_launch.py`

## Setup Arduino

- Install Arduino IDE
- Add `https://www.adafruit.com/package_adafruit_index.json` to Arduino preferences additional boards URLs
- Install board `Adafruit nRF52`
- Install `pip3 install --user adafruit-nrfutil`
- Update bootloader
  - https://learn.adafruit.com/introducing-the-adafruit-nrf52840-feather/update-bootloader
  - Double press reset to enter DFU mode
- Install Micro-XRCE-DDS Agent
  - `git clone https://github.com/eProsima/Micro-XRCE-DDS-Agent.git`
  - `cd Micro-XRCE-DDS-Agent && git checkout foxy`
  - `mkdir build && cd build`
  - `source /opt/ros/dashing/setup.bash # to share libraries with ros2`
  - `cmake ..`
  - `make`
  - `sudo make install`
  - `sudo ldconfig /usr/local/lib/`

## Update cmake

- `cmake --version`
- `sudo apt update`
- `sudo apt install -y software-properties-common lsb-release`
- `wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | gpg --dearmor - | sudo tee /etc/apt/trusted.gpg.d/kitware.gpg >/dev/null`
- `sudo apt-add-repository "deb https://apt.kitware.com/ubuntu/ $(lsb_release -cs) main"`
- `sudo apt update`
- `sudo apt install kitware-archive-keyring`
- `sudo rm /etc/apt/trusted.gpg.d/kitware.gpg`
- `sudo apt update`
- `sudo apt install cmake`
- `cmake --version`

## Build micro-ros on MBED

- https://github.com/micro-ROS/micro_ros_mbed
- `pip3 install catkin_pkg lark-parser empy colcon-common-extensions mbed-tools`
- `sudo apt install gcc-arm-none-eabi`
- clone repo and cd into it
- `mbed-tools deploy`
- `mbed-tools compile -m LPC1768 -t GCC_ARM -f`

## Install ROS

[Installation guide](https://docs.ros.org/en/foxy/Installation/Ubuntu-Install-Debians.html).

- Enable universe (probably not needed)
  - `sudo apt install software-properties-common`
  - `sudo add-apt-repository universe`
- Add repository
  - `sudo apt update && sudo apt install curl gnupg2 lsb-release`
  - `sudo curl -sSL https://raw.githubusercontent.com/ros/rosdistro/master/ros.key -o /usr/share/keyrings/ros-archive-keyring.gpg`
- Add repository to sources list
  - `echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/ros-archive-keyring.gpg] http://packages.ros.org/ros2/ubuntu $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/ros2.list > /dev/null`
- Install ROS
  - `sudo apt update`
  - `sudo apt install ros-foxy-desktop`
- Install autocomplete
  - `sudo apt install -y python3-argcomplete`
- Add sourcing ROS to bashrc
  - `echo "source /opt/ros/foxy/setup.bash" >> ~/.bashrc`
- Add colcom_cd to bashrc
  - `echo "source /usr/share/colcon_cd/function/colcon_cd.sh" >> ~/.bashrc`
  - `echo "export _colcon_cd_root=~/ros2_install" >> ~/.bashrc`
- Check environment variables
  - `printenv | grep -i ROS`
- Set domain id (random number between 0-101 inclusive)
  - `echo "export ROS_DOMAIN_ID=<your_domain_id>" >> ~/.bashrc`
- Test ROS (open in separate terminals)
  - `ros2 run demo_nodes_cpp talker`
  - `ros2 run demo_nodes_py listener`
- Install ros bag for data recording/playback
  - `sudo apt-get install ros-galactic-ros2bag ros-galactic-rosbag2-storage-default-plugins`

## Install tools

- Install VSCode
  - `sudo snap install --classic code`

## Install TurtleSim

- Install
  - `sudo apt install ros-foxy-turtlesim`
- Check the package installed
  - `ros2 pkg executables turtlesim`
- Start turtlesim
  - `ros2 run turtlesim turtlesim_node`
- Start teleop to control the turtle
  - `ros2 run turtlesim turtle_teleop_key`

## Install RQT

- Install rqt
  - `sudo apt update`
  - `sudo apt install ~nros-foxy-rqt*`
- Run rqt
  - `rqt`
- Add service called
  - `select Plugins > Services > Service Caller`
  - Call `/spawn` with `x=1.0, y=1.0, name='turtle2'`
- Remap control to turtle 2
  - `ros2 run turtlesim turtle_teleop_key --ros-args --remap turtle1/cmd_vel:=turtle2/cmd_vel`
- Render rtq graph
  - `rqt_graph`
  - can also add to `rtq` by `Plugins > Introspection > Nodes Graph`

## ROS Command line

- Run node
  - `ros2 run turtlesim turtlesim_node`
  - `ros2 run turtlesim turtle_teleop_key`
  - `ros2 run turtlesim turtlesim_node --ros-args --log-level WARN` to run with custom log level
- List resources
  - `ros2 node list`
  - `ros2 topic list`
  - `ros2 topic list -t` to also show message types
  - `ros2 service list`
  - `ros2 service list -t` to also show service types
  - `ros2 action list`
  - `ros2 param list`
- Get node info
  - `ros2 node info /my_turtle`
- Show data published to topic
  - `ros2 topic echo /turtle1/cmd_vel` to see velocity commands
  - `ros2 topic echo /turtle1/pose` to see changing pose
- Get topic info
  - `ros2 topic info /turtle1/cmd_vel`
- Show messsage interface
  - `ros2 interface show geometry_msgs/msg/Twist`
- Publish message to topic
  - `ros2 topic pub <topic_name> <msg_type> '<args>'` where args is in YAML syntax
  - `ros2 topic pub --once /turtle1/cmd_vel geometry_msgs/msg/Twist "{linear: {x: 2.0, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 1.8}}"` publishes once
  - `ros2 topic pub --rate 1 /turtle1/cmd_vel geometry_msgs/msg/Twist "{linear: {x: 2.0, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 1.8}}"` publishes continuosly at 1Hz
- Show how often data is published to a topic
  - `ros2 topic hz /turtle1/pose`
- Get service type info
  - `ros2 service type <service_name>`
  - `ros2 service type /clear`
- Find service by type
  - `ros2 service find <type_name>`
  - `ros2 service find std_srvs/srv/Empty`
- Show service type structure
  - `ros2 interface show <type_name>.srv` where request and response structure is separated by ---
  - `ros2 interface show std_srvs/srv/Empty.srv`
  - `ros2 interface show turtlesim/srv/TeleportAbsolute.srv`
  - `ros2 interface show turtlesim/srv/Spawn`
- Call service
  - `ros2 service call <service_name> <service_type> <arguments>`
  - `ros2 service call /clear std_srvs/srv/Empty`
  - `ros2 service call /spawn turtlesim/srv/Spawn "{x: 2, y: 2, theta: 0.2, name: ''}"`
- Get param list
  - `ros2 param list`
- Get param value
  - `ros2 param get <node_name> <parameter_name>`
  - `ros2 param get /turtlesim background_g`
- Set param value
  - `ros2 param set <node_name> <parameter_name> <value>`
  - `ros2 param set /turtlesim background_r 150`
- Dump node parameters
  - `ros2 param dump <node_name>`
  - `ros2 param dump /turtlesim`
- Start node using parameters from dumped file
  - `ros2 run <package_name> <executable_name> --ros-args --params-file <file_name>`
  - `ros2 run turtlesim turtlesim_node --ros-args --params-file ./turtlesim.yaml`
- Get list of node actions
  - `ros2 node info /turtlesim`
  - `ros2 node info /teleop_turtle`
- Get list of all actions
  - `ros2 action list`
  - `ros2 action list -t` to also show action types
- Get action info
  - `ros2 action info /turtle1/rotate_absolute`
- Get action interface info
  - `ros2 interface show turtlesim/action/RotateAbsolute`
- Call action
  - `ros2 action send_goal <action_name> <action_type> <values>`
  - `ros2 action send_goal /turtle1/rotate_absolute turtlesim/action/RotateAbsolute "{theta: 1.57}"`
  - `ros2 action send_goal /turtle1/rotate_absolute turtlesim/action/RotateAbsolute "{theta: 3.14}" --feedback` to also get feedback
- Run rqt console
  - `ros2 run rqt_console rqt_console`
- Start node
  - `ros2 run rqt_console rqt_console`
- Launch launch file
  - `ros2 topic pub -r 1 /turtlesim1/turtle1/cmd_vel geometry_msgs/msg/Twist "{linear: {x: 2.0, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: -1.8}}"`
- Record topic to bag
  - `ros2 bag record <topic_name>` to record a topic
  - `ros2 bag record /turtle1/cmd_vel`
  - `ros2 bag record -o subset /turtle1/cmd_vel /turtle1/pose` top choose filename `subset` and record multiple topics
- Get bag info
  - `ros2 bag info <bag_file_name>`
  - `ros2 bag info subset`
- Play back bag recording
  - `ros2 bag play <bag_file_name>`
  - `ros2 bag play subset`

## Example launch file

Starts two turtlesim nodes with different namespace names and a mimic node that makes the second turtle mimic first one.

```py
from launch import LaunchDescription
from launch_ros.actions import Node

def generate_launch_description():
    return LaunchDescription([
        Node(
            package='turtlesim',
            namespace='turtlesim1',
            executable='turtlesim_node',
            name='sim'
        ),
        Node(
            package='turtlesim',
            namespace='turtlesim2',
            executable='turtlesim_node',
            name='sim'
        ),
        Node(
            package='turtlesim',
            executable='mimic',
            name='mimic',
            remappings=[
                ('/input/pose', '/turtlesim1/turtle1/pose'),
                ('/output/cmd_vel', '/turtlesim2/turtle1/cmd_vel'),
            ]
        )
    ])
```

## TMUX terminal splitter

- Install
  - `sudo apt install tmux`
- Start
  - `tmux`
- Split terminal
  - horizonal `ctrl+b %`
  - vertical `ctrl+b "`
- Manage windows
  - create `ctrl+b c`
  - close `exit`
  - rename `ctrl+b ,`
- Navigate
  - between panels `ctrl+b ARROWS`
  - between windows `ctrl+b N` where first N=0, second N=1 etc

## Base ros setup

https://docs.ros.org/en/foxy/Installation/Ubuntu-Install-Binary.html#linux-install-binary-install-missing-dependencies

/opt/ros/foxy

- sudo apt install -y python3-rosdep
- rosdep update
- rosdep install --from-paths /opt/ros/foxy/share --ignore-src --rosdistro foxy -y --skip-keys "console_bridge fastcdr fastrtps osrf_testing_tools_cpp poco_vendor rmw_connextdds rti-connext-dds-5.3.1 tinyxml_vendor tinyxml2_vendor urdfdom urdfdom_headers"

## Creating workspace

https://docs.ros.org/en/foxy/Tutorials/Workspace/Creating-A-Workspace.html

- mkdir -p ~/dev_ws/src
- cd ~/dev_ws/src
- git clone https://github.com/ros/ros_tutorials.git -b foxy-devel
- rosdep install -i --from-path src --rosdistro foxy -y
- colcon build
- open new terminal to source overlay
- cd ~/dev_ws

## Build package

- create workspace directory `mkdir ros2_ws` etc
- create "src" in this directory
- copy the library/package into src
- `rosdep install -i --from-path src --rosdistro foxy -y` to install dependencies
- cd back to workspace and run `colcon build` to build the package

## Teleop robot controller

- https://github.com/ros-teleop/teleop_tools/tree/foxy-devel
- https://ubuntu.com/blog/the-teleop_tools-arrive-in-ros-2-dashing
- `ros2 run mouse_teleop mouse_teleop`
- `ros2 run mouse_teleop mouse_teleop --ros-args -r holonomic:=true`
- `ros2 topic echo /mouse_vel`

## Run experiments/test_odrive_ros2 package

- `cd ~/rosbot/experiments/test_odrive_ros2/`
- `ros2 run odrive_ros2 odrive_node`
- `ros2 service call /connect_odrive std_srvs/srv/Trigger`
- `ros2 service call /request_state odrive_interfaces/srv/AxisState "{axis: 0, state: 8}"` (not needed if started in closed loop control)
- `ros2 service call /velocity_cmd odrive_interfaces/srv/VelocityControl "{axis: 0, turns_s: 0.5}"`
- `ros2 topic echo /barrery_percentage` (typo.. and not sure of the format, returns something like 3.5)
- `ros2 topic echo /joint_state`

## RVIZ2

- https://www.stereolabs.com/docs/ros2/rviz2/

# Run experiments/test_odrive_ros2_control package

- https://ros-controls.github.io/control.ros.org/getting_started.html
- https://github.com/ros-controls/ros2_control
- https://github.com/ros-controls/ros2_controllers
- https://github.com/ros-controls/ros2_control_demos
- https://github.com/ros-controls/ros2_controllers/tree/master/diff_drive_controller
- http://wiki.ros.org/urdf
- https://github.com/ros-controls/roadmap/blob/master/design_drafts/components_architecture_and_urdf_examples.md
- https://github.com/ros-controls/ros2_control_demos/blob/master/ros2_control_demo_bringup/config/diffbot_diff_drive_controller.yaml
- https://github.com/ros-controls/ros2_control_demos/tree/master/ros2_control_demo_description/diffbot_description
- https://github.com/ros-controls/ros2_control_demos/blob/master/ros2_control_demo_bringup/launch/diffbot_system.launch.py
- https://ros-controls.github.io/control.ros.org/ros2_control/ros2controlcli/doc/userdoc.html#ros2controlcli-userdoc CLI
- `cd ~/rosbot/experiments/test_odrive_ros2_control/`
- `sudo apt install ros-foxy-ros2-control ros-foxy-ros2-controllers`
- `ros2 launch odrive_bringup odrive.launch.py enable_joint1:=true`
- `ros2 topic pub -r 100 /joint0_velocity_controller/commands std_msgs/Float64MultiArray "data: [1]"`
- `ros2 topic pub -r 100 /joint1_velocity_controller/commands std_msgs/Float64MultiArray "data: [-1]"`

## Run ros2_control_demos

- copy repo https://github.com/ros-controls/ros2_control_demos
- create workspace folder, move demo repo folders under `src`
- `cd ros2_control_demos/`
- `rosdep install -i --from-path src --rosdistro foxy -y`
- `colcon build`
- open new terminal
- `cd ros2_control_demos/`
- `. install/local_setup.bash`
- `ros2 launch ros2_control_demo_bringup diffbot_system.launch.py start_rviz:=true`
- `ros2 control list_hardware_interfaces` to list ros control hardware interfaces
- `ros2 control list_controllers` to list ros control controllers
- publish velocity command

```
ros2 topic pub --rate 30 /diff_drive_controller/cmd_vel_unstamped geometry_msgs/msg/Twist "linear:
 x: 0.7
 y: 0.0
 z: 0.0
angular:
 x: 0.0
 y: 0.0
 z: 1.0"
```

- control with mouse_teleop, remapping /mouse_vel to /diff_drive_controller/cmd_vel_unstamped
- `ros2 run mouse_teleop mouse_teleop --ros-args -r /mouse_vel:=/diff_drive_controller/cmd_vel_unstamped`

## Open VSCode from Ubuntu explorer context menu

- Run the following in terminal
- `wget -qO- https://raw.githubusercontent.com/cra0zy/code-nautilus/master/install.sh | bash`

## Configure ssh

- `ssh-keygen -t rsa` to create ssh key in `~/.ssh` if not already present
- `cat ~/.ssh/id_rsa.pub` to get public key from computer that wants to access robot
- add the public key to robot's `~/.ssh/authorized_keys` file
- create `~/.ssh/config` file on the remote computer with contents like

```
Host rosbot
    HostName rosbot
    User ubuntu
```

- `ssh rosbot` to open ssh connection to robot using the configuration and ssh key

## Create package

cd ~/dev_ws/src
ros2 pkg create --build-type ament_cmake <package_name>
ros2 pkg create --build-type ament_cmake --node-name my_node my_package
ros2 pkg create --build-type ament_cmake --node-name talker test_chat

## Develop C++

https://github.com/ros2/rclcpp
http://docs.ros2.org/latest/api/rclcpp/
http://wiki.ros.org/std_msgs

## Develop nodejs

https://github.com/RobotWebTools/rclnodejs
https://github.com/RobotWebTools/rclnodejs-cli
http://robotwebtools.org/rclnodejs/docs/0.20.0/index.html
https://github.com/RobotWebTools/rclnodejs/tree/develop/example
npx generate-ros-messages

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