[Solved] What will be the output of this Python MQTT client code snippet when publishing a message... What will be the output of this Python MQTT client code snippet when publishing a message with QoS 1? | Raspberry Pi

Raspberry Pi - MQTT for IoT

What will be the output of this Python MQTT client code snippet when publishing a message with QoS 1?

import paho.mqtt.client as mqtt
client = mqtt.Client()
client.connect('broker.hivemq.com', 1883)
result = client.publish('test/topic', 'Hello', qos=1)
print(result.rc)

AError

B0

CNone

D1

Step-by-Step Solution

Solution:

Step 1: Understand publish return code
The 'publish' method returns a result with 'rc' 0 on success.
Step 2: Analyze the code output
Since connection and publish are correct, 'result.rc' will be 0 indicating success.
Final Answer:
0 -> Option B
Quick Check:
MQTT publish success code = 0 [OK]

Quick Trick: MQTT publish returns 0 on success [OK]

Common Mistakes:

MISTAKES

Assuming QoS affects return code
Expecting None instead of 0
Confusing return code with message payload

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What will be the output of this Python MQTT client code snippet when publishing a message with QoS 1?

Step 1: Understand publish return code

Step 2: Analyze the code output

Final Answer:

Quick Check:

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