multiple module instances overwrites itself values


  • Module Developer

    Hello,
    i am working on a module for FHEM. The module can show data like temperature from FHEM devices. It is working, but if i add two instances of the module to the config.js it overwrites the dom values.

        {
          module: 'MMM-FHEM',
          position: 'bottom_bar',
          config: {
            host: '192.168.178.28',
            port: '8083',
            deviceNames: [
                          'LaCr.Thermo01',
                          'LaCr.Thermo02',
                          'LaCr.Thermo03',
                         ],
            deviceReadings: [
                              { name: 'temperature', icon: 'wi wi-thermometer', suffix: '°' },
                              { name: 'humidity', icon: 'wi wi-humidity', suffix: '%' },
                            ],
          },
        },
        {
          module: 'MMM-FHEM',
          position: 'top_right',
          header: 'top_right',
          config: {
            host: '192.168.178.28',
            port: '8083',
            deviceNames: [
                          'LaCr.Thermo03',
                          'LaCr.Thermo04',
                          'LaCr.Thermo05',
                         ],
            deviceReadings: [
                              { name: 'temperature', icon: 'wi wi-thermometer', suffix: '°' },
                              { name: 'humidity', icon: 'wi wi-humidity', suffix: '%' },
                            ],
          },
        },
    

    Right values should different from the bottom one.
    0_1474756392729_Bildschirmfoto 2016-09-25 um 00.32.15.png

    Any idea why? You can find the code here https://github.com/BenRoe/MMM-FHEM


  • Module Developer

    Ok other question.
    If i setup a module twice in the config, do they share the variables from the code?



  • Any news here?


  • Module Developer

    @DazDavid nope



  • Would it work if u give them names like MMM-FHEM1 and MMM-FHEM2?

    Cause if u add two instances with the same name in the config i can imagine, that he will read the first value and overwrites them in the second instance. Like

    var variable = 1;
    var variable = 2;

    Output would be 2.



  • most of modules don’t support multi-instance because the way magicmirror is done, they share node_helper and thus, both instances received all notifications so the last notification will overwrite both modules.

    either you duplicate the module (and edit the source code a little bit) or the module itself but be rewrittent to manage multi-instances.


  • Module Developer

    @bobbob601 thx for the answer. Do you have a example how to write a module with multi-instace support?


  • Module Developer

    @BenRoe

    Having the same problem with my module… A theoretical solution could be to make node_helper multi instance aware by appending some identifier to the notification unique to the instance: ie GET_WEATHER_001… The helper triggers on GET_WEATHER and builds an array with the different notifications and payloads. It then periodically runs through the array getting the appropriate requests and sending out notifications like WEATHER_001 with the specific payload.

    Haven’t built it yet though…



  • @BenRoe nope. And I tried several months ago without success. But I’m trying it now (thought I’ll not be able to test before the next week). If it works, it could be easily implemented everywhere and furthermore, I have an idea to simplify it a little bit by improving Magic Mirror itself.

    I’ll come back here after my tests



  • @bobbob601 I got it working by passing a unique ID to the node helper and passing it back from the node helper.

    https://github.com/trgraglia/MMM-MVG-LocalTransport

    Hope this helps.


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