import paho.mqtt.client as mqtt
import json

# Define callback functions
def on_connect(client, userdata, flags, rc):
    print("Connected with result code " + str(rc))
    client.subscribe("demo")

def on_message(client, userdata, msg):
    payload = msg.payload.decode('utf-8')
    payload_data = json.loads(payload)
    print(f"number of people detected: {payload_data['count']}, frame_time: {payload_data['frame_time']}")

# Set up client and connect to broker
client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.connect("127.0.0.1", 1883, 60)

# Loop forever to receive messages
client.loop_forever()