some initial files loaded

software/backend/mqtt_client_basic.py

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+import paho.mqtt.client as mqtt
+
+
+def on_connect(_client, userdata, flags, rc):
+    print("Connected with result code " + str(rc))
+    client.subscribe("test/topic")
+
+
+def on_message(_client, userdata, msg):
+    print(msg.topic + " " + str(msg.payload))
+
+
+client = mqtt.Client()
+client.on_connect = on_connect
+client.on_message = on_message
+
+client.connect("localhost", 1883, 60)
+
+client.loop_forever()
+
+"""In this example, we create a new instance of the mqtt.Client class and set up the on_connect and on_message 
+callback functions. The on_connect function is called when the client successfully connects to the broker, 
+and the on_message function is called when a message is received on a subscribed topic.
+
+Then, we call the connect method to connect to the MQTT broker running on the local machine on port 1883, and set the 
+keepalive value to 60 seconds.
+
+Finally, we call the loop_forever method to start the client and begin processing incoming messages. This method 
+blocks the program execution and runs the client loop in a loop until the client is disconnected. (ChatGPT)"""