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5cc78e03bd
paho-mqtt version 2.0 is quite different to the old version 1, so the code needs updating to support the new version
54 lines
1.2 KiB
Plaintext
54 lines
1.2 KiB
Plaintext
---
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id: mqtt-python
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title: Python
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sidebar_label: Python
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sidebar_position: 2
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---
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### Sending/receiving messages on mosquitto server using python
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Here is an example publish message in python (run `pip install paho-mqtt` first):
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```python
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#!/usr/bin/env python3
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import paho.mqtt.client as mqtt
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from random import uniform
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import time
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client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2)
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client.connect('localhost')
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while True:
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randNumber = uniform(20.0, 21.0)
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client.publish("env/test/TEMPERATURE", randNumber)
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print("Just published " + str(randNumber) + " to topic TEMPERATURE")
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time.sleep(1)
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```
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Here is example subscribe in python:
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```python
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#!/usr/bin/env python3
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import paho.mqtt.client as paho
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def on_message(mosq, obj, msg):
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print("%-20s %d %s" % (msg.topic, msg.qos, msg.payload))
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mosq.publish('pong', 'ack', 0)
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def on_publish(mosq, obj, mid, reason_codes, properties):
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pass
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if __name__ == '__main__':
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client = paho.Client(paho.CallbackAPIVersion.VERSION2)
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client.on_message = on_message
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client.on_publish = on_publish
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client.connect("localhost", 1883, 60)
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client.subscribe("env/test/TEMPERATURE", 0)
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while client.loop() == 0:
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pass
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```
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