[Solved] Identify the error in this MQTT client setup code on a Raspberry Pi:client = mqtt.Client() client.connect("broker.local") client.subscribe("home/kitchen/temperature") client.... | Raspberry Pi

Raspberry Pi - MQTT for IoT

Identify the error in this MQTT client setup code on a Raspberry Pi:

client = mqtt.Client()
client.connect("broker.local")
client.subscribe("home/kitchen/temperature")
client.loop_forever()

# Missing on_message callback assignment

AThe on_message callback is not assigned, so messages won't be processed.

BThe client ID is missing in mqtt.Client() constructor.

CThe subscribe topic is invalid syntax.

Dloop_forever() should be called before connect().

Step-by-Step Solution

Solution:

Step 1: Check callback assignment
Without assigning client.on_message, received messages have no handler and won't be processed.
Step 2: Verify other parts
Client ID is optional but recommended; subscribe syntax is correct; loop_forever() must be after connect().
Final Answer:
The on_message callback is not assigned, so messages won't be processed. -> Option A
Quick Check:
Missing on_message means no message handling [OK]

Quick Trick: Always assign on_message callback to process messages [OK]

Common Mistakes:

MISTAKES

Ignoring on_message callback assignment
Thinking client ID is mandatory
Calling loop_forever() before connect()

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More Raspberry Pi Quizzes

Identify the error in this MQTT client setup code on a Raspberry Pi:

Step 1: Check callback assignment

Step 2: Verify other parts

Final Answer:

Quick Check:

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