Answers for "mqtt topic tutorial in python"

3

mqtt python

import paho.mqtt.client as mqtt

# 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("house/#")

# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
    print(str(msg.topic) + " " + str(msg.payload.decode("utf-8")))

client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message

client.connect("your.host", 1883, 60)

# Blocking call that processes network traffic, dispatches callbacks and
# handles reconnecting.
# Other loop*() functions are available that give a threaded interface and a
# manual interface.
# With loop_start you have to write the while loop yourself but the programma will continue
client.loop_forever() 	# loop_forever acts as a while True loop (the program will not continue past here). 


# how to publish
your_data = "data"
client.publish("your/pub/topic", your_data)
Posted by: Guest on October-02-2021

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