adding mqtt resources

week6/resources/timed_client.py

@@ -0,0 +1,42 @@
+import time
+import paho.mqtt.client as mqtt
+
+# Configuration
+BROKER = "localhost"  # Public test broker
+PORT = 1883
+TOPIC = "python/mqtt/test"
+
+def on_connect(client, userdata, flags, reason_code, properties):
+    print(f"Connected with result code {reason_code}")
+    # Subscribe to the topic immediately upon connection
+    client.subscribe(TOPIC)
+
+def on_message(client, userdata, msg):
+    print(f"Received message on {msg.topic}: {msg.payload.decode()}")
+
+# Create client instance
+client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2)
+client.on_connect = on_connect
+client.on_message = on_message
+
+# Connect to broker
+try:
+    client.connect(BROKER, PORT, 60)
+    client.loop_start()  # Start network loop in a background thread
+    
+    # Publish a message
+    time.sleep(2)  # Wait for subscription to settle
+    client.publish(TOPIC, "Hello from Paho MQTT!", qos=1)
+    print("Message published.")
+    
+    # Keep running to receive messages
+    time.sleep(5)
+    
+except Exception as e:
+    print(f"Error: {e}")
+finally:
+    # how to disconnect
+    # client.loop_stop()
+    # client.disconnect()
+    print("Disconnected.")   
+