balena-control 🖥️

This package allows you to control any device running Balena OS from your local network. It exposes an API which allows you to trigger different actions.

Usage

Add balena-control as services to your docker-compose.yml.

version: "2.1"
services:
  balena-control:
    build: .
    restart: always
    privileged: true
    ports:
      - 3009:3009
    environment:
      - BALENA_CONTROL_PORT=3009

Configuration ⚙️

Out of the box there is no need for a configuration, but it is possible to override the default values.

BALENA_CONTROL_PORT=3009

Security 🔒

The request is similar to WOL not encrypted or secured. Make sure it only runs inside a private network. You can have a minor

BALENA_CONTROL_TOKEN=random_string

Control

http://XXX.XXX.XXX.XXX:3009 is the local IP address of your device. 3009 is the default port balena-control is running on. All Responses have the general structure to verify if the response is a success:

{
  success: true,
  _error: null,
  data: {...}
}

The Return value describes the data property. You can run all the commands from terminal like curl -X POST http://localhost:3009/wake

Get status (WIP)

GET http://XXX.XXX.XXX.XXX:3009/status

Returns

{
  "status": "online",
  "display": "active"
}

Wake computer

Wake up the device from sleep. Turn on all the periphery and return to normal usage. This takes some time (1-5 minutes)

POST http://XXX.XXX.XXX.XXX:3009/wake

Returns

{
	[...]
    "data": {
        "status": "all devices awake"
    }
}

Sleep computer

Sleep the computer and turn all the periphery off.

POST http://XXX.XXX.XXX.XXX:3009/sleep

Returns

{
	[...]
    "data": {
        "status": "all devices sleeping"
    }
}

Reboot computer

reboot and reset the system completely.

POST http://XXX.XXX.XXX.XXX:3009/reboot

Returns

{
	[...]
    "data": {
        "status": "success"
    }
}

Shutdown computer (experimental) 📴

Warning

This will also shut down the network of Raspberry Pi computers, so it will not react to any WOL triggers. The Device needs to be powered off and on manually after this!

Shut down the computer.

POST http://XXX.XXX.XXX.XXX:3009/shutdown

Returns

{
  "status": "prepare-shutdown",
  "display": "active"
}

Debug

Check PJLINK Connection

To check if pjlink reacts on the projector you can use a simple netcat command: echo '%1POWR ?' | nc 192.168.XXX.XXX 4352. There should be a response like POWR=0.

Screenshot 📸

Enable public device url. Make sure you also have xserver running. This will allow you to get a screenshot of the application currently running on the public device url.

TODO: Documentation for XSERVER_PORT=80

Development

The application uses a small node.js (express) application.

npm run install

Run the development

npm run dev

Run the development without actually triggering shutdown, etc.

npm run dev:dry