add in the led light code

rp2040_client/main.py

@@ -1,4 +1,5 @@
 import time
+from machine import Pin
 from umqtt.simple import MQTTClient
 
 
@@ -6,9 +7,20 @@ import network
 import time
 from math import sin
 
+led = Pin("LED", Pin.OUT)
+led.value(1)
+
+button = Pin(14, Pin.IN, Pin.PULL_UP)
+
 # Received messages from subscriptions will be delivered to this callback
 def sub_cb(topic, msg):
     print((topic, msg))
+    if msg == b'on':
+        print("turn LED on")
+        led.value(1)
+    elif msg == b'off':
+        print("turn LED off")
+        led.value(0)
 
 
 def main(server="192.168.1.59"):