I am a Node.js noob and I created a module for interfacing with a keypad connected to my arduino. The Arduino communicates to my RPi via serial USB. My application keeps crashing...

glorianneef

I have checked for configuration errors and this is all fine. Everything seems to go smoothly until I add my node_helper.js. I will upload my config file, main module file, and my helper. Any help would be appreciated. Can’t seem to find the reason for breaking my Magic mirror. =
MMM-Timer.js

Module.register("MMM-Timer", {
// Default module config.
   defaults: {
   	text: "Hello World!"
   },

   // Override dom generator.
   getDom: function() {
   	var wrapper = document.createElement("div");
   	wrapper.innerHTML = this.config.text;
   	return wrapper;
   },
   start: function() {
   	this.mySpecialProperty = "So much wow!";
   	Log.log(this.name + ' is started!');
   	var self = this;
   	setInterval(function() {
   	self.updateDom(); // no speed defined, so it updates instantly.
   		}, 1000); //perform every 1000 milliseconds.
   },
   notificationReceived: function(notification, payload, sender) {
   	if (sender) {
   		Log.log(this.name + " received a module notification: " + notification + " from sender: " + sender.name);
   	} else {
   		Log.log(this.name + " received a system notification: " + notification);
   	}
   },
   socketNotificationReceived: function(notification, payload) {
   	Log.log(this.name + " received a socket notification: " + notification + " - Payload: " + payload);
   }
});

node_helper.js

var NodeHelper = require("node_helper");
const { spawn } = require('child_process');
const child = spawn('~/serial_communication.py');

module.exports = NodeHelper.create({
	start: function() {
		this.mySpecialProperty = "So much wow!";
		Log.log(this.name + ' is started!');
	},
	stop: function() {
		console.log("Shutting down MyModule");
		console.log('kill');
    		child.kill();
		this.connection.close();
	},
	// Override socketNotificationReceived method.

	socketNotificationReceived: function(notification, payload) {
		Log.log(this.name + " received a socket notification: " + notification + " - Payload: " + payload);
	},

	// Test another function
	aFunction: function() {
		child.stdout.on('data', (data) => {
  			console.log(`child stdout:\n${data}`);
		});
		
		child.stderr.on('data', (data) => {
  			console.error(`stderr: ${data}`);
		});
		child.on('close', (code) => {
  			console.log(`child process exited with code ${code}`);
		});
		//want to return the python subprocess
		this.sendSocketNotification('MY_TIMER_DATA', data);
	}
});

sdetweil

@glorianneef move sendsocketnotification in the data.on handler
child.stdout.on('data… ()=>{
sendsocketnotification(notice, data)
}

on phone, best i can do

glorianneef

Thank you for the reply!
However, I sadly am still shown a black screen of doom… not too sure.

sdetweil

@glorianneef dont copy exactly from my posts

i wouldnt start the spawn unstil start time