[Tut] Controlling Lights with Pulse Width Modulations

01.py

import RPi.GPIO as GPIO
import sys

GPIO.setmode(GPIO.BCM)

PIN_LIVING = 4
GPIO.setup(PIN_LIVING, GPIO.OUT)

02.py

living = GPIO.PWM(PIN_LIVING, 100)
living.start(0)

03.py

dc = 50
living.ChangeDutyCycle(dc)

04.py

PIN_FIREPLACE = 27
GPIO.setup(PIN_FIREPLACE, GPIO.OUT)

05.py

fire = GPIO.PWM(PIN_FIREPLACE, 30)
fire.start(0)

06.py

try:
    while 1:
        pass
except KeyboardInterrupt:
    GPIO.cleanup()
    sys.exit(1)

07.html

<script src="http://cdn.pubnub.com/pubnub-3.7.11.min.js"></script>

08.html

<input id="lightliving" type="range" min="0" max="100" step="1" value="0">

09.js

var pubnub = PUBNUB({
  publish_key: 'demo',
  subscribe_key: 'demo'
});

10.js

function publishUpdate(data) {
  pubnub.publish({
    channel: 'pi-house', 
    message: data
  });
}

var lightLiving = document.getElementById('lightLiving');

lightLiving.addEventListener('change', function(e){
  publishUpdate({item: 'light-living', brightness: + this.value});
}, false);

11.py

from pubnub import Pubnub

pubnub = Pubnub(publish_key='demo', subscribe_key='demo')

12.py

pubnub.subscribe(channels='pi-house', callback=_callback, error=_error)

13.py

def _callback(m, channel):
    print(m)

    dc = m['brightness']

    if m['item'] == 'light-living':
        living.ChangeDutyCycle(dc)

def _error(m):
  print(m)

Hi, pubnub api v4 is quite different and I'm having trouble with the callback. It's now using listener which I don't really know where to start. Can you help me with that?