I think the source could be null too

sendNotification("ALL_MODULES_STARTED");

Going out, hmm, it seems that it’s main sending it out, I wonder if that is supposed to be payload Value, and notiId is supposed to be something like main? Hmm, I hope sergge1 or @bugsounet knows that.

@bugsounet If you are still around, do you have any idea about the notification format in notiDictionary.js?

    {
      module: "MMM-ViewNotifications",
      position: "top_left",
      header: "Notifications",
      config: {
        excludeModules: ["clock","newsfeed","currentweather","calendar","MMM-News-QR"]
      }
    },

What did I do wrong since it still displays noti’s from these?

So I guess I should add this to the notiDictionary.js
I’m unsure of the payloadValue?

{
  notiId: "ALL_MODULES_STARTED",
  notiPayload: [
    {
      payloadValue: '1',
      notiMqttCmd: ["SCREENON"]
    }
  ]
}

from the doc
https://docs.magicmirror.builders/development/core-module-file.html#subclassable-module-methods

ALL_MODULES_STARTED

do you get an error from trying to post the message?

if so, I would check and loop and sleep a little, then try again

So it just says

# This file is still here to keep PM2 working on older installations.
cd ~/MagicMirror
DISPLAY=:0 npm start

So I guess that just launches it, but it’s not actually ready at that point, thus the MMM-MQTTbridge is also not ready to receive the ‘hdmi off’ command.
Aren’t there some sort of notification that says ‘done, ready for running’ when it starts, I could put that notification in the MMM-MQTTbridge so that would also launch the ‘SCREENON’ back to MQTT.

if so it runs the installers/mm.sh

pm2 info xx
where xx is the name or number of the pm2 entry shown by pm2 status
will show u the command used to start mm

if you used my install script and selected pm2,
then the script is
~/MagicMirror/installers/mm.sh

so it doesn’t know it was off, and user_presence is different anyhow.

if u can use curl to post a message to the mq channel, then add a line to the startup script to send the user presence notification