I created this library if you want to manage for screen in your module.
This library is very simplified and ready for use in your node_helper.js

This library is used in MMM-Assistant2Display

single node routine for managing your screen

Installation

npm install @bugsounet/screen

Sample with screen contructor

const Screen = require("@bugsounet/screen")

this.config = {
  delay: 10 * 1000,
  turnOffDisplay: true,
  ecoMode: true,
  displayCounter: true,
  detectorSleeping: true,
  governorSleeping: true,
  rpi4: false,
  linux: false
}

var debug = true

this.screen = new Screen(this.config, callback, debug, detectorControl, governorControl)
this.screen.start()
setTimeout(() => { this.screen.state() } , 5 * 1000)
setTimeout(() => { this.screen.stop() } , 15 * 1000)

function callback(noti, value) {
  if (noti == "SCREEN_TIMER") console.log ("Turn off in", value)
  else console.log("Screen Notification:", noti)
}

function detectorControl(noti) {
  console.log("detectorControl Notification:", noti)
}

function governorControl(noti) {
  console.log("governorControl Notification:", noti)
}

constructor of screen

Screen(screenConfig, callback, debug, detectorControl, governorControl)

screenConfig {}

• delay - Time before turns off the display. (in ms).
• turnOffDisplay - Should the display turn off after timeout?
• ecoMode - send a notification to hide all module after timeout?
• displayCounter - send a notification with count-down before sleeping
• detectorSleeping - send a notification to manage detector when screen is off
• governorSleeping - send a notification to manage governor when screen is off
• rpi4 - rpi4 support (use dpms)
• linux - linux support (use dpms)

callback (notification,value)

• SCREEN_TIMER - Display the count down before sleeping mode (require displayCounter)
• SCREEN_SHOWING - return notification for showing modules or other (require ecoMode)
• SCREEN_HIDING - return notification for hiding modules or other (require ecoMode)
• SCREEN_STATE - return object with actual screen state
  
  object value:
  • running: return true if screen main script with count down is running
  • locked: return true if screen function is locked
  • power: return true if your display is On

{
  running: true,
  locked: false,
  power: true
}

detectorControl [optional]

require @bugsounet/snowboy or compatible

require detectorSleeping and only work with activate() or start() function

• SNOWBOY_START - return notification for start your detector
• SNOWBOY_STOP - return notification for stop your detector

governorControl [optional]

require @bugsounet/governor

require governorSleeping and only work with activate() or start() function

• GOVERNOR_WORKING - return notification to change your governor to working configuration
• GOVERNOR_SLEEPING - return notification to change your governor to sleeping configuration

debug

if you want debuging information, just set to true

Functions

• activate(): activate main screen script with count down (use it with first use)
  
  it force turn on display when escape the script (ctl + c)
• start(): start screen script with count down
• stop(): stop screen script
• reset(): reset count down
• wakeup(): wake up the screen
• lock(): lock the screen (start/stop/reset/wakeup will be ignored)
• unlock(): unlock the screen
• wantedPowerDisplay(wanted): comparate actual screen state and apply it if not set.
  
  wanted value is boolean:
  • true: turn on screen
  • false: turn off screen
• setPowerDisplay(set): like wantedPowerDisplay() but you force to apply it
  set value is boolean:
  • true: force turn on screen
  • false: force turn off screen
• state(): return state of screen in object

Notes

• turnOffDisplay work only with activate() or start() function
• you can use only wantedPowerDisplay() or setPowerDisplay() without main script !