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[Python] Python MQTT


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Ich möchte Temperatur Daten mit einer Callback Funktion an meinen MQTT Broker senden.

Welche Variable des example_callback scripts enthält denn die Temperaturwerte?

Mit t.CALLBACK_TEMPERATURE bekomme ich immer nur den Wert 8?


meine Skript sieht so aus:


HOST = ""

PORT = 4223

UID = "t8u" # Change to your UID


import time


import paho.mqtt.client as mqtt


from tinkerforge.ip_connection import IPConnection

from tinkerforge.bricklet_temperature import BrickletTemperature


def on_connect(client, userdata, flags, rc):

    print("Connected with result code " + str(rc))


# Callback function for temperature callback (parameter has unit °C/100)

def cb_temperature(temperature):

    print("Temperature: " + str(temperature/100.0) + " °C")



if __name__ == "__main__":

    ipcon = IPConnection() # Create IP connection

    t = BrickletTemperature(UID, ipcon) # Create device object


    ipcon.connect(HOST, PORT) # Connect to brickd

    # Don't use device before ipcon is connected


    # Register temperature callback to function cb_temperature

    t.register_callback(t.CALLBACK_TEMPERATURE, cb_temperature)


    # Set period for temperature callback to 1s (1000ms)

    # Note: The temperature callback is only called every second

    #      if the temperature has changed since the last call!



client = mqtt.Client()

client.on_connect = on_connect


client.connect("vmiot01srv", 1883, 60)




while True:


    client.publish("tinkerforge/bricklet/temperature/t8u/temperature", str(t.CALLBACK_TEMPERATURE))





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Du registrierst hier die cb_temperature Funktion für den Temperatur Callback:


# Register temperature callback to function cb_temperature
t.register_callback(t.CALLBACK_TEMPERATURE, cb_temperature)


Die t.CALLBACK_TEMPERATURE Konstante identifiziert den Temperatur Callback, damit register_callback weiss worum es geht.


Die Bindings rufen dann deine cb_temperature Funktion auf und übergeben die aktuelle Temperatur sobald das Bricklet eine Änderung der Temperatur meldet.


Du kannst also deinen publish() Aufruf in die cb_temperature() Funktion verlegen.

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