Unable to sendSocketNotification from node_helper to Module

jc21

Hi community, I’m pulling my hair out trying to get this one working.

I’ve got my MMM-IFTTT module nearly completed, except for a small hickup.

In the node_helper.js I’m sending a socket notification that is not getting through to the UI. It was working at some stage before nesting it in another function, so I assume it’s a scope issue. I’ve tried debugging everything everywhere, even using this.io to send it the hard way.

I’m using the new ES6 anonymous function syntax, ie:

this.expressApp.post('/IFTTT', (req, res) => {

which should keep the this reference from outside of the function and all my console logging suggests it does, however I think that the io reference is not the same one somehow, and despite the this.io.of(this.name).emit(notification, payload); succeeding in the node helper library, the notification simply doesn’t show in the UI dev console.

This is also apparent when trying the var self = this; method, using the self object even immediately doesn’t send through the socket.

Any help on this scope stuff would be appreciated! Thanks in advance.

Raspbian Jessie
Node version: v6.6.0

strawberry 3.141

@jc21 did you try the common way?

this.sendSocketNotification('MSG', 'Hello World');

and in the module itself

socketNotificationReceived: function(notification, payload){
    if(notification === 'MSG'){
        Log.info(payload);
    }
}

jc21

I dumbed the module right down:

node_helper.js

const NodeHelper = require('node_helper');

module.exports = NodeHelper.create({
    start: function() {
        console.log('[IFTTT] Starting node_helper');

        var self = this;
        setTimeout(function () {
            self.sendSocketNotification('MSG', {message: 'test'});
        }, 10000);
    }
});

MMM-IFTTT.js

//...
    socketNotificationReceived: function(notification, payload) {
        if (notification === 'MSG'){
            Log.info(payload);
        }
    },
//...

Still not getting the log in dev console

strawberry 3.141

@jc21 If I’m right you must start the connection from the module, but can’t test it right now

MMM-IFTTT.js

start: function() {
        this.sendSocketNotification('START', {message: 'start connection'});
},

socketNotificationReceived: function(notification, payload) {
        if (notification === 'MSG'){
            Log.info(payload);
        }
    },

node_helper.js

const NodeHelper = require('node_helper');

module.exports = NodeHelper.create({
    start: function() {
        console.log('[IFTTT] Starting node_helper');
    },

    socketNotificationReceived: function(notification, payload) {
        if (notification === 'START'){
            setTimeout(() => {
                this.sendSocketNotification('MSG', {message: 'test'});
             }, 10000);
        }
    },
});

jc21

Wow that is not obvious or documented.

However, that worked Thanks heaps!