Trouble getting notified when device disconnects

[facultymatt]

I have a sample app and the peripheral.on('disconnect') is not working as expected.

var noble = require('noble');

noble.on('stateChange', function(state) {
  if (state === 'poweredOn') {
    noble.startScanning([], false);
  } else {
    noble.stopScanning();
  }
});

noble.on('discover', function(peripheral) {
  peripheral.connect();
  peripheral.on('connect', function() {
    console.log('Hello ' + peripheral.advertisement.localName);
  });
  peripheral.on('goodbye', function() {
    console.log('Goodbye ' + peripheral.advertisement.localName);
  });
});

I would expect this would give me the message hello and goodbye as my bluetooth device moved in and out of range. The hello message works, but I never get a disconnect event.

Is there a better way to do this?

[sandeepmistry]

Two notes:

• your code snippet is listening for a goodbye event instead of disconnect
• How are you triggering a disconnect? Going out of range, triggering it peripheral side?

I've updated the snippet to disconnect after connecting:

var noble = require('noble');

noble.on('stateChange', function(state) {
  if (state === 'poweredOn') {
    noble.startScanning([], false);
  } else {
    noble.stopScanning();
  }
});

noble.on('discover', function(peripheral) {
  peripheral.connect();
  peripheral.on('connect', function() {
    console.log('Hello ' + peripheral.advertisement.localName);
    peripheral.disconnect(); // change 1
  });
  peripheral.on('disconnect', function() { // change 2
    console.log('Goodbye ' + peripheral.advertisement.localName);
  });
});

[facultymatt]

Ahh, good catch, cut and paste error. In my code I'm using peripheral.on('disconnect').

If I call peripheral.disconnect(); then it works as expected. However I'm attempting to trigger the disconnect on the peripheral side, by turning it off. Seems this doesn't cause the disconnect event to be fired as expected.

Thoughts?

[sandeepmistry]

Which peripheral are you using?

I haven't tried turning a device off while connected. On OS X blued/CoreBluetooth is responsible for the disconnect event - maybe you just have to wait a while?

[sandeepmistry]

Closing due to inactivity, @facultymatt re-open if necessary.