Python in to the magic mirror.

[paulvanderheijden90]

Hello @Sean,
Again thank you for the help. As I say after your help it was possible for me to “print” a string variable on the magic mirror module through python.
But is was not able to put my P2000 alarm from the fire department on my screen. I noticed that it was a problem in the python script of the alarm.
I used the stdout.write function again. like you told me. but I needed to add the flush function as wel.
so now it is

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

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

[paulvanderheijden90]

@sean
Hello Sean,
like I posted yesterday the app is running now. And it is showing wat I need to display. So im very happy.

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?

[A Former User]

@paulvanderheijden90
I have no idea about Python. I think you’d better reboot once or twice per daily to maintain RPI to be stable. You can do it with cron automatically.
The better approach would be implementing your job as native nodeJS MagicMirror module instead external python script.

[sdetweil]

@paulvanderheijden90 can u put your project on github and tell me where it is… I will look at it later today (us time)

[paulvanderheijden90]

@sdetweil
Hallo Thank you for you’re Replay

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

[sdetweil]

sorry, the is no PUBLIC repo there

[paulvanderheijden90]

@sean
Hello Sean,
The problem is not the python project. But I think the buffer is filling up ore something.

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.

[paulvanderheijden90]

@sdetweil fixed sorry

[sdetweil]

@paulvanderheijden90 i don’t see the python module

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

[sdetweil]

@paulvanderheijden90 so far I don’t see the same crash error…

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…

[paulvanderheijden90]

@sdetweil
hello ! Thank you for your help so far.

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

[sdetweil]

@paulvanderheijden90 I wrote a little hello world python script to send data. All that is working as expected so far

How big is the data buffer your python script sends?

[paulvanderheijden90]

@sdetweil
it is almost 50 char long. Im making a screen movie to let you see what I meen so it will become clear.
Send it you in a couple of minutes

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

[cowboysdude]

Very interested in this project… I have a python script to control my thermostat and was wondering how to get port it over…this may give me some answers :)

[sdetweil]

@paulvanderheijden90 i submitted a pull request to your repo. this code runs for hours and hours…
tiny changes from yours…

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

[paulvanderheijden90]

@sdetweil @Sean
Hello Guys Thank you for your vallueed help!

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)



    })



  }



})

[sdetweil]

does your python script continue to run once its started? the design of the node helper starting the script every second depends on the script ending…

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…

[A Former User]

@paulvanderheijden90
You can put var process = spawn("python", ["/home/pi/src/P2000.py"])
into start function if you want to execute when module is successfully loaded.

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.

[paulvanderheijden90]

@sdetweil
Yes one time start the python and it will run.