import paho.mqtt.client as mqtt  # import library

MQTT_SERVER = "localhost"  # specify the broker address, it can be IP of raspberry pi or simply localhost
MQTT_PATH = "test_channel"  # this is the name of topic, like temp


# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, flags, rc):
    print("Connected with result code " + str(rc))

    # Subscribing in on_connect() means that if we lose the connection and
    # reconnect then subscriptions will be renewed.
    client.subscribe(MQTT_PATH)


# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
    print(msg.topic + " " + str(msg.payload))
    # more callbacks, etc


client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.connect(MQTT_SERVER)
client.loop_forever()  # use this line if you don't want to write any further code. It blocks the code forever to check for data
# client.loop_start()  #use this line if you want to write any more code here