litra-rs

💡 Control your Logitech Litra light from the command line

Features

With this tool, you can:

• Turn your light on and off
• Check if the light is on or off
• Set and get the brightness of your light
• Set and get the temperature of your light
• Automatically turn the light on and off when your webcam turns on or off (Linux only)

Supported devices

The following Logitech Litra devices, connected via USB, are supported:

• Logitech Litra Glow
• Logitech Litra Beam
• Logitech Litra Beam LX

Installation

macOS with Homebrew

1. Install the latest version by running brew tap timrogers/tap && brew install litra.
2. Run litra --help to check that everything is working and see the available commands.

All other platforms (using Cargo)

1. Install Rust on your machine, if it isn't already installed.
2. Install the litra crate by running cargo install litra.
3. Run litra --help to check that everything is working and see the available commands.

All other platforms (via binary)

1. Download the latest release for your platform. macOS, Linux and Windows devices are supported.
2. Add the binary to $PATH, so you can execute it from your shell. For the best experience, call it litra on macOS and Linux, and litra.exe on Windows.
3. Run litra --help to check that everything is working and see the available commands.

Configuring udev permissions on Linux

On most Linux operating systems, you will need to manually configure permissions using udev to allow non-root users to access and manage Litra devices.

To allow all users that are part of the video group to access the Litra devices, copy the 99-litra.rules file into /etc/udev/rules.d. Next, reboot your computer or run the following commands as root:

# udevadm control --reload-rules
# udevadm trigger

Usage

From the command line

The following commands are available for controlling your devices:

• litra on: Turn your Logitech Litra device on
• litra off: Turn your Logitech Litra device off
• litra toggle: Toggles your Logitech Litra device on or off
• litra brightness: Sets the brightness of your Logitech Litra device, using either --value (measured in lumens) or --percentage (as a percentage of the device's maximum brightness). The brightness can be set to any value between the minimum and maximum for the device returned by the devices command.
• litra temperature: Sets the temperature of your Logitech Litra device, using a --value measured in kelvin (K). The temperature be set to any multiple of 100 between the minimum and maximum for the device returned by the devices command.
• litra auto-toggle (Linux only): Automatically turns your Logitech Litra device on when your webcam starts capturing video, and off when it stops capturing video. This command should be left running in the background.

All of the these commands support a --serial-number/-s argument to specify the serial number of the device you want to target. If you only have one Litra device, you can omit this argument. If you have multiple devices, we recommend specifying it. If it isn't specified, the "first" device will be picked, but this isn't guaranteed to be stable between command runs.

The following commands are also included:

• litra devices: List Logitech Litra devices connected to your computer. This will be returned in human-readable format by default, or you can get JSON output with the --json flag.

Each CLI command can also be called with --help for more detailed documentation.

From a Rust application

The litra crate includes functions for interacting with Litra devices from your Rust applications.

To see the full API, check out the documentation on Docs.rs or read through src/lib.rs.