[Solved] You want to create a Raspberry Pi program that subscribes to multiple topics:... Which code snippet correctly subscribes to all three topics using paho-mqtt? | Raspberry Pi

Raspberry Pi - MQTT for IoT

You want to create a Raspberry Pi program that subscribes to multiple topics: 'home/kitchen', 'home/livingroom', and 'home/bedroom'. Which code snippet correctly subscribes to all three topics using paho-mqtt?

Aclient.subscribe('home/kitchen,home/livingroom,home/bedroom')

Bclient.subscribe([('home/kitchen', 0), ('home/livingroom', 0), ('home/bedroom', 0)])

Cclient.subscribe('home/kitchen', 'home/livingroom', 'home/bedroom')

Dclient.subscribe(['home/kitchen', 'home/livingroom', 'home/bedroom'])

Step-by-Step Solution

Solution:

Step 1: Understand multi-topic subscription syntax
paho-mqtt accepts a list of tuples (topic, qos) to subscribe to multiple topics.
Step 2: Evaluate options
client.subscribe([('home/kitchen', 0), ('home/livingroom', 0), ('home/bedroom', 0)]) uses correct list of tuples; A and B have wrong argument formats; D uses list of strings without qos.
Final Answer:
client.subscribe([('home/kitchen', 0), ('home/livingroom', 0), ('home/bedroom', 0)]) -> Option B
Quick Check:
Subscribe multiple topics = C [OK]

Quick Trick: Use list of (topic, qos) tuples to subscribe multiple topics [OK]

Common Mistakes:

MISTAKES

Passing multiple strings as separate arguments
Passing comma-separated string of topics
Passing list of strings without qos

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More Raspberry Pi Quizzes

Which code snippet correctly subscribes to all three topics using paho-mqtt?

Step 1: Understand multi-topic subscription syntax

Step 2: Evaluate options

Final Answer:

Quick Check:

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