Let's-a-go - Vehicle State Monitor

A lightweight Go tool that monitors the vehicle state in Redis and immediately sets the vehicle to ready to drive after unlocking.

Part of the Librescoot open-source platform.

Features

• Connects to Redis at 192.168.7.1:6379
• Monitors the state field in the vehicle hash for state transitions
• When state changes from stand-by to parked, it:
  • Sets ready to true in the dashboard hash
  • Publishes a ready message to the dashboard channel
• Lightweight and efficient for embedded systems
• Optimized for ARMv7l architecture

Building

Prerequisites

• Go 1.15+
• Make

Build for Local Testing

make

Build for ARMv7l Target

make dist-arm

This creates an optimized and stripped binary called letsago-arm.

Installation

Automatic Installation (on target device)

1. Build the ARM binary:

   make dist-arm

2. Copy the entire directory to the target device

3. Run the install script with root privileges:

   sudo ./install.sh

4. Enable and start the service:

   sudo systemctl enable letsago
   sudo systemctl start letsago

Manual Installation

1. Build the ARM binary:

   make dist-arm

2. Copy the binary to the target:

   scp letsago-arm user@target:/usr/bin/letsago

3. Set executable permissions:

   ssh user@target "chmod +x /usr/bin/letsago"

4. Copy the service file:

   scp letsago.service user@target:/etc/systemd/system/

5. Enable and start the service:

   ssh user@target "systemctl daemon-reload && systemctl enable --now letsago"

Usage

Once installed and running, the service will automatically:

• Connect to Redis at 192.168.7.1:6379
• Monitor the vehicle state transitions
• Update dashboard when state transitions from stand-by to parked

Checking Status

systemctl status letsago

Viewing Logs

journalctl -u letsago

Development

• Main logic is in main.go
• Modify Redis connection details or behavior in the constants section
• Use make to build for local testing

License

This project is dual-licensed. The source code is available under the GNU Affero General Public License v3.0. The maintainers reserve the right to grant separate licenses for commercial distribution; please contact the maintainers to discuss commercial licensing.