javascript - Calling a class function from within another class function - JS newb

Question

This is probably more of a javascript question but I dont really know javascript in general, so im hoping its a simple fix.

So basically I am using two libraries that I want to work together. The beacon class listens for a bluetooth LE signal on a raspberry pi, at which point the onAdvertisement fucntion is called from the node-beacon-scanner library.

When this happens I want to publish a message to a message broker using MQTT (the other library), which should be a case of just calling client.publish(topic, message).

THe publish function works when I use it outside of the scanner functions, however if I call it inside one of the scanner functions such as onAdvertisement, it doesnt work, but also doesnt throw any errors.

I think it is an issue of me not understanding encapsualtion in node.js regarding modules.

Basically I want to know is there somthign im missing when calling the client.publish function from within the scanner.onadvertisement function? In the code below the publish call has been put in a function called pubBe.

Thankyou in advance!

    const noble = require('@abandonware/noble');
    const BeaconScanner = require("node-beacon-scanner");
    const mqtt = require('mqtt');
    
    var client  = mqtt.connect('http://localhost:1883');
    var scanner = new BeaconScanner();
    var ledOn = false
    
    client.on('connect', function () {
      client.subscribe('led', function (err) {
        if (!err) {
          
        }
      })
    })
     
    client.on('message', function (topic, message) {
      // message is Buffer
      console.log(message.toString())
      client.end()
    })
    
    scanner.onadvertisement = (advertisement) => {
        var beacon = advertisement["rssi"]
    }
    
    scanner.startScan().then(() => {
        console.log("Scanning has started...")
        pubBe(-10)
    }).catch(error => {
        console.error(error);
    })
    
    function pubBe(rssi){
      if( rssi > -40 && !ledOn){
        console.log('Turn LED on')
        ledOn = true
        payload = {"level": 100}
        client.publish('led', JSON.stringify(payload))
        
      }else if ( rssi < -40 && ledOn){
        console.log('Turn LED off')
        ledOn = false
        payload = {"level": 0}
        client.publish('led', JSON.stringify(payload))      
      }        
    }

question from:https://stackoverflow.com/questions/65906331/calling-a-class-function-from-within-another-class-function-js-newb

Answer 1

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