[Solved] Identify the error in this MQTT client setup code: import paho.mqtt.client as mqtt client = mqtt.Client() client.connect('broker.hivemq.com', 1883) client.subscribe('home/temperature') client.... | Raspberry Pi

Raspberry Pi - MQTT for IoT

Identify the error in this MQTT client setup code:

import paho.mqtt.client as mqtt

client = mqtt.Client()
client.connect('broker.hivemq.com', 1883)
client.subscribe('home/temperature')
client.on_message = lambda c, u, m: print(m.payload)
# Missing client.loop_forever()

AThe on_message callback is assigned after subscribe()

BThe subscribe topic is invalid

CThe broker address is incorrect

DThe client loop method to process network events is missing

Step-by-Step Solution

Solution:

Step 1: Check client loop usage
MQTT client needs a loop method like loop_forever() or loop_start() to process messages.
Step 2: Verify other parts
Assigning on_message after subscribe is allowed; broker and topic are valid.
Final Answer:
The client loop method to process network events is missing -> Option D
Quick Check:
Missing loop = no message processing [OK]

Quick Trick: Always run client.loop_start() or loop_forever() after setup [OK]

Common Mistakes:

MISTAKES

Not running the client loop to handle messages
Thinking on_message must be set before subscribe
Assuming broker or topic is wrong without checking

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Identify the error in this MQTT client setup code:

Step 1: Check client loop usage

Step 2: Verify other parts

Final Answer:

Quick Check:

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