Hi,  I have adapted the def sub(topic,msg) routine in you example code to detect a topic which I have defined as

topic_sub = b’cmnd/garage/door  and it works fine reporting if my garage door is open or closed.

I would like to add a second topic (e.g. topic_sub = b’cmnd/garage/light)  to receive messages about my garage light is  but I am not sure how to do this?

Is it possible to be subscribed to more than one topic ? and how to I check this second topic?

def sub_cb(topic, msg):
  print((topic, msg))
  oled.fill(0)
   if msg == b'on':
      oled.text(topic,0,20)
      oled.text('on:door open',0,40)
      ledr.value(0)
      ledg.value(1)
  if msg == b'off':
      oled.text(topic,0,20)
      oled.text('off:door closed',0,40)
      ledr.value(1)
      ledg.value(0)
  oled.text(msg, 0, 0)
  oled.show()