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    Problem with sending socket notification to module

    Scheduled Pinned Locked Moved Unsolved Troubleshooting
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    • P Offline
      PerBa
      last edited by

      (sorry if this is a re-post, I made a post but couldn’t find it later. Admin can remove this post if needed)

      Hello,
      I’m new to MagicMirror, but I have a problem with two swedish modules:
      MMM-SL-PublicTransport
      MMM-Weather-SMHI-Hourly

      When I’m using them I get the same problem:
      Notifications from module to helper works fine
      Notifications from helper to module does not work (notifications never received).

      I don’t know how to handle this problem. I’ve spent a day with debug logs now, but I’m nowhere close to a solution.

      I would be so happy if someone with knowledge about the communication procedures could look into these two modules and see if they perhaps haven’t been updated after a “core-functionality” change.

      Thanks,
      Per Badlund, Sweden

      S 1 Reply Last reply Reply Quote 0
      • S Away
        sdetweil @PerBa
        last edited by

        @PerBa can u show your code in node helper to send?

        Usually the problem is that the ‘this’ pointer is inside some API callback, and not pointing to the node_helper instance.

        ‘this’ is always troublesome.

        That is why many module save ‘this’ at start time in ‘self’ and use ‘self’ instead of ‘this’

        Sam

        How to add modules

        learning how to use browser developers window for css changes

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        • P Offline
          PerBa
          last edited by

          Re: Problem with sending socket notification to module

          The line of code that sends the notification is:

          getDepartures: function () {
          var self = this;
          ...
          self.sendSocketNotification('DEPARTURES', CurrentDeparturesArray); 
          

          the corresponding code in the module is:

          socketNotificationReceived: function (notification, payload) {
          	Log.info('MODULE:: received notification');
          	Log.info("Received Notification" + notification);
                  if (notification === 'DEPARTURES') {
          

          Thanks!

          S 1 Reply Last reply Reply Quote 0
          • S Away
            sdetweil @PerBa
            last edited by sdetweil

            @PerBa

            getDepartures: function () {
            var self = this;
            

            Careful. getDepartures is not called by mm, so it’s very likely that ‘this’ is NOT pointing to the node_module instance.

            Save ‘this’ when u get the 1st socketnotification only. Just once.

            Sam

            How to add modules

            learning how to use browser developers window for css changes

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            • P Offline
              PerBa
              last edited by

              Thanks for the help!
              I don’t know what happend, but I forgot to turn off the Pi during the night. This morning the Pi had crashed. I did a power-toggle and now one of the modules (the one I cleaned up regarding the “this-self”) is working.

              I must look more into this.

              Update: I now know what is behind the problem!!!
              After a power toggle everything works OK. But when I stop and restart the MagicMirror using

              pm2 stop mm
              

              and

              pm2 start mm
              

              The modules stop working.

              Does anybody know a better way of restarting the Magic Mirror?
              I must be able to do that in order to test the changes I do to the configuration…

              S D 3 Replies Last reply Reply Quote 0
              • S Away
                sdetweil @PerBa
                last edited by sdetweil

                @PerBa I do this start/stop a hundred times a day without problem.

                I kill all the node processes
                I don’t use pm2

                Sam

                How to add modules

                learning how to use browser developers window for css changes

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                • D Offline
                  dazza120 @PerBa
                  last edited by

                  @PerBa is this a Pi4 or Buster? Seems to be loads of issues with one of these. @sdetweil is the man to help though

                  1 Reply Last reply Reply Quote 0
                  • S Away
                    sdetweil @PerBa
                    last edited by

                    @PerBa any update?

                    Sam

                    How to add modules

                    learning how to use browser developers window for css changes

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