MMM-P2000.js

/// MMM-P2000.js

Module.register("MMM-P2000", {
  getDom: function() {
    var e = document.createElement("div")
    e.id = "DISPLAY"
    return e
  },
  notificationReceived: function(notification, payload, sender) {
    switch(notification) {
      case "DOM_OBJECTS_CREATED":
        var timer = setInterval(()=>{
          this.sendSocketNotification("GIVE_ME_DATA")
        }, 1000)
        break
    }
  },
  socketNotificationReceived: function(notification, payload) {
    switch(notification) {
      case "HERE_IS_DATA":
        var e = document.getElementById("DISPLAY")
        e.innerHTML = payload
        break
    }
  },
})

node_helper.js

/// node_helper.js
const spawn = require("child_process").spawn
var NodeHelper = require("node_helper")

module.exports = NodeHelper.create({
  socketNotificationReceived: function(notification, payload) {
    switch(notification) {
      case "GIVE_ME_DATA":
        this.job()
        break
    }
  },
  job: function() {
    var process = spawn("python", ["/home/pi/src/test.py"])
    process.stdout.on("data", (data)=>{
      console.log(data)
      this.sendSocketNotification("HERE_IS_DATA", data)
    })
  }
})

I didn’t test. I wrote this code with only my brain. so there could be errors, but you can catch the concept.

Or you can make some START notification from main module then use it as trigger for execution. You can use socketNotificationReceived function to that purpose.

Or, you can terminate spawned child process when it becomes needless.

or as you have found you will kill the system (doesn’t matter, pi or larger)…

you could do it your suggested way… but typically, one would add code in the notification received to start it once…

I found out that the spawn function is called every time. so in a couple of minuts the spawn function has called 100 python projects. and this is blocking the raspberry

I changed is to this: and now im going to Import the project of sdetweil in the software. But it is no more blocking.
thank you guys

/// node_helper.js



const spawn = require("child_process").spawn



var NodeHelper = require("node_helper")


var process = spawn("python", ["/home/pi/src/P2000.py"])




module.exports = NodeHelper.create({



  socketNotificationReceived: function(notification, payload) {



    switch(notification) {



      case "GIVE_ME_DATA":


	

        this.job()



        break



    }



  },



  job: function() {

	
    
    process.stdout.on("data", (data)=>{

      console.log(data)

      var result = String.fromCharCode.apply(null, new Uint16Array((data)))

      this.sendSocketNotification("HERE_IS_DATA", result)



    })



  }



})

the biggest is that the module filename is changed to match the name of the project
(but that isn’t why it hung)… I actually don’t know the cause on your side…

please download my code and try it out… let me know

Please see the full movie and notice the fail at 1:41
https://www.youtube.com/watch?v=VBYL1j4p2aI&feature=youtu.be

How big is the data buffer your python script sends?

The python project is running fine on it selfs.

But wenn I use it with the magic mirror the buffer of the magic mirror is filling. And freezes.

the python project is made in combination with a Antenna.
Setup looks like https://nl.oneguyoneblog.com/2016/08/09/p2000-ontvangen-decoderen-raspberry-pi/#comment-488

so you’ll need to have data from the Multimom to get different information to send to the mirror

I did have to make some minor changes…

Module name to match the git repo name
path to a python script
and change the display handling…
rule is ONLY content change location is getDom()…
other routines should store data and call updateDom(0 to signal that there ARE changes to display

I’m gonna let it run for a while…

you can add it to the directory and repo temporarily, then remove it later

At this point all the massages are displayed on the mirror and after 15 min the mirror is freeze.

So im looking in to it.

I managed to upload the project on git hub ( new experience for me )
I uploaded the magic mirror Module ( P2000) I made and the node helper.

And I added the Python project.

The python project works fine on it self. But wenn I call ( spawn ) the python. The magic mirror application stops and freezes.

I think the flush/write fills the buffer and wenn it is it full the application is stoped.

https://github.com/paulvanderheijden90/MMM-P2000-python-connect

Here is the link

But…
After a time ( more after a couple of runs ) the magic mirror app is crashed and freezed. So noting is updating any more.

My feeling is telling that the buffer were I put in the string value is filling up.

wenn i run the python script without the mirror it is running fine.

Please can you give me a help?

sys.stdout.write("hallo ik ben Paul")
sys.stdout.flush()

And then it was working !
so thank you and here the result:

Now it is working !!!
So very nice ! im going to put this in my P2000 Raspberry python Programma. and will heave a lot of play with it.

I will post/ show you the and result !

Crashing? show me th

App threw an error during load
/home/pi/MagicMirror/modules/MMM-P2000/node_helper.js:76
}.call(this, exports, require, module, __filename, __dirname); });
                                                            ^

SyntaxError: missing ) after argument list
    at createScript (vm.js:80:10)
    at Object.runInThisContext (vm.js:139:10)
    at Module._compile (module.js:606:28)
    at Object.Module._extensions..js (module.js:653:10)
    at Module.load (module.js:561:32)
    at tryModuleLoad (module.js:504:12)
    at Function.Module._load (module.js:496:3)
    at Module.require (module.js:586:17)
    at require (internal/module.js:11:18)
    at loadModule (/home/pi/MagicMirror/js/app.js:127:17)
Whoops! There was an uncaught exception...
/home/pi/MagicMirror/modules/MMM-P2000/node_helper.js:76
}.call(this, exports, require, module, __filename, __dirname); });
                                                            ^

SyntaxError: missing ) after argument list
    at createScript (vm.js:80:10)
    at Object.runInThisContext (vm.js:139:10)
    at Module._compile (module.js:606:28)
    at Object.Module._extensions..js (module.js:653:10)
    at Module.load (module.js:561:32)
    at tryModuleLoad (module.js:504:12)
    at Function.Module._load (module.js:496:3)
    at Module.require (module.js:586:17)
    at require (internal/module.js:11:18)
    at loadModule (/home/pi/MagicMirror/js/app.js:127:17)
MagicMirror will not quit, but it might be a good idea to check why this happened. Maybe no internet connection?
If you think this really is an issue, please open an issue on GitHub: https://github.com/MichMich/MagicMirror/issues
Launching application.

Buffer 48 61 6c 6c 6f 20 49 6b 20 62 65 6e 20 50 61 75 6c>

i was trying to figure out the text line that it was representing but it was not showing something.

So im happy you came up with the solution for the buffer.

Unfortunly wenn at the var result code the magic mirror is crashing again and im not able to debug.
Can you please heave a look at it

/// node_helper.js

const spawn = require("child_process").spawn

var NodeHelper = require("node_helper")



module.exports = NodeHelper.create({

  socketNotificationReceived: function(notification, payload) {

    switch(notification) {

      case "GIVE_ME_DATA":

        this.job()

        break

    }

  },

  job: function() {

    var process = spawn("python", ["/home/pi/src/test.py"])

    process.stdout.on("data", (data)=>{
	
      console.log(data)

      var result = String.fromCharCode.apply(null, new Uint16Array((data))

      this.sendSocketNotification("HERE_IS_DATA", result)

    })

  }