The ROS 2 teleop snap allows for teleoperating a robot from either the keyboard, gamepad or leave it to the navigation stack.
The snap offers the possibility to teleoperate the robot from a joystick with:
snap start ros2-teleop.joy
This app launches both the gamepad driver as well as the joy teleop node.
Parameters for the joystick application are:
At least one between the joy-config and the config-filepath parameters must be set for the application to run.
In case both joy-config and config-filepath are set, the configuration file will take precedence.
The upstream package offers some default joystick configurations. Those can be set up with the joy-config parameter as follows:
snap set ros2-teleop joy-config="ps3"
In alternative, a custom configuration file can be used. The file can be provided
by means of a URL. In such case, the snap will download the file and
place it in $SNAP_COMMON/config/joy_teleop.config.yaml.
To configure the config-filepath to a URL:
snap set ros2-teleop config-filepath="https://raw.githubusercontent.com/robot-repo/joy_teleop.config.yaml"
Note: the URL must be reachable by the snap. When using a URL, the configuration file will be downloaded everytime the joy app is launched. Therefore a configuration update upstream will be applied with the application relaunch.
Otherwise to configure the config-filepath to a local configuration file:
snap set ros2-teleop config-filepath="/var/snap/ros2-teleop/common/config/joy_teleop.config.yaml"
The local configuration should be at a path accessible to the snap such as $SNAP_COMMON.
The robot can also be teleoperated from a keyboard (e.g. SSH) by launching the application with:
ros2-teleop.key
Optional parameters for the keyboard application are: key-vel (string, default: 'key_vel')
The snap makes use of a topic multiplexer to switch from one source to another. Its input topic can be selected as,
ros2-teleop.mux-select <topic>
The topics names can also be configured with snap parameters:
Note that when launching the joy or key app, the appropriate topic is automatically selected.
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Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.
Snap can be installed on Fedora from the command line:
sudo dnf install snapd
Either log out and back in again, or restart your system, to ensure snap’s paths are updated correctly.
To enable classic snap support, enter the following to create a symbolic link between /var/lib/snapd/snap and /snap:
sudo ln -s /var/lib/snapd/snap /snap
To install ros2-teleop, simply use the following command:
sudo snap install ros2-teleop
Browse and find snaps from the convenience of your desktop using the snap store snap.
Interested to find out more about snaps? Want to publish your own application? Visit snapcraft.io now.
